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working on better 9patch support

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This commit is contained in:
Michael Freno
2025-10-15 13:02:10 -04:00
parent a4bf705f49
commit 551ccb6400
11 changed files with 981 additions and 531 deletions
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2
.gitignore vendored
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@@ -1,3 +1,5 @@
Cartographer.lua Cartographer.lua
OverlayStats.lua OverlayStats.lua
themes/metal/
themes/space/
.DS_STORE .DS_STORE

48
CHANGELOG.md
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@@ -5,6 +5,17 @@ All notable changes to FlexLove will be documented in this file.
## [Unreleased] ## [Unreleased]
### Added ### Added
- **Android 9-Patch Auto-Parsing**: Automatic parsing of *.9.png files
- Automatically detects and parses Android 9-patch files based on .9.png extension
- Extracts stretch regions and content padding from 1-pixel border markers
- Supports multiple non-contiguous stretch regions on both axes
- Manual insets override auto-parsing for backward compatibility
- Console logging for transparency ("[FlexLove] Auto-parsed 9-patch: ...")
- Added `ImageDataReader` module for pixel data extraction
- Added `NinePatchParser` module with `parse()` function
- Theme system automatically processes 9-patch files during theme loading
- Space theme updated to use button.9.png with auto-parsing
- **Corner Radius Support**: Added `cornerRadius` property for rounded corners - **Corner Radius Support**: Added `cornerRadius` property for rounded corners
- Supports uniform radius (single number) or individual corners (table) - Supports uniform radius (single number) or individual corners (table)
- Automatically clips children to parent's rounded corners using stencil buffer - Automatically clips children to parent's rounded corners using stencil buffer
@@ -83,6 +94,43 @@ All notable changes to FlexLove will be documented in this file.
## Migration Guide ## Migration Guide
### Using Android 9-Patch Files
FlexLove now automatically parses Android 9-patch (*.9.png) files. Simply rename your files to include the `.9.png` extension and remove manual insets:
```lua
-- Old (manual insets)
components = {
button = {
atlas = "themes/space/button.png",
insets = { left = 14, top = 14, right = 14, bottom = 14 }
}
}
-- New (auto-parsed from .9.png file)
components = {
button = {
atlas = "themes/space/button.9.png"
-- insets automatically extracted from 9-patch borders
}
}
-- Manual override still works
components = {
button = {
atlas = "themes/space/button.9.png",
insets = { left = 20, top = 20, right = 20, bottom = 20 } -- Overrides auto-parsing
}
}
```
**9-Patch Format:**
- Top border (row 0): Horizontal stretch regions (black pixels = stretchable)
- Left border (column 0): Vertical stretch regions (black pixels = stretchable)
- Bottom border: Horizontal content padding (optional)
- Right border: Vertical content padding (optional)
- Supports multiple non-contiguous stretch regions for complex scaling patterns
### From `background` to `backgroundColor` ### From `background` to `backgroundColor`
If you're updating existing code, replace all instances of `background` with `backgroundColor`: If you're updating existing code, replace all instances of `background` with `backgroundColor`:

758
FlexLove.lua
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@@ -1,225 +1,8 @@
--[[ --[[
================================================================================
FlexLove - Flexible UI Library for LÖVE Framework FlexLove - Flexible UI Library for LÖVE Framework
================================================================================
A comprehensive UI library providing flexbox/grid layouts, theming, animations,
and event handling for LÖVE2D games.
ARCHITECTURE OVERVIEW:
---------------------
1. Color System - RGBA color utilities with hex conversion
2. Theme System - 9-slice theming with state support (normal/hover/pressed/disabled)
3. Units System - Responsive units (px, %, vw, vh, ew, eh) with viewport scaling
4. Layout System - Flexbox, Grid, Absolute, and Relative positioning
5. Event System - Mouse/touch events with z-index ordering
6. Animation System - Interpolation with easing functions
7. GUI Manager - Top-level manager for elements and global state
API CONVENTIONS:
---------------
- Constructors: ClassName.new(props) -> instance
- Static Methods: ClassName.methodName(args) -> result
- Instance Methods: instance:methodName(args) -> result
- Getters: instance:getPropertyName() -> value
- Internal Fields: _fieldName (private, do not access directly)
- Error Handling: Constructors throw errors, utility functions return nil + error string
NAMING PATTERNS:
---------------
- Classes: PascalCase (Element, Theme, Color)
- Functions: camelCase (resolveImagePath, getViewport)
- Properties: camelCase (backgroundColor, textColor, cornerRadius)
- Constants: UPPER_SNAKE_CASE (TEXT_SIZE_PRESETS, FONT_CACHE_MAX_SIZE)
- Private: _prefixedCamelCase (_pressed, _themeState, _borderBoxWidth)
PARAMETER ORDERING:
------------------
- Position: (x, y, width, height) - standard order
- Units: (value, unit, viewportW, viewportH, parentSize) - value first
- Drawing: (element, position, dimensions, styling, opacity) - element first
RETURN VALUE PATTERNS:
---------------------
- Single Success: return value
- Success/Failure: return result, errorMessage (nil on success for error)
- Multiple Values: return value1, value2 (documented in @return)
- Constructors: Always return instance (never nil)
USAGE EXAMPLE:
-------------
```lua
local FlexLove = require("libs.FlexLove")
-- Initialize with base scaling and theme
FlexLove.Gui.init({
baseScale = { width = 1920, height = 1080 },
theme = "space"
})
-- Create a button with flexbox layout
local button = FlexLove.Element.new({
width = "20vw",
height = "10vh",
backgroundColor = FlexLove.Color.new(0.2, 0.2, 0.8, 1),
text = "Click Me",
textSize = "md",
themeComponent = "button",
callback = function(element, event)
print("Button clicked!")
end
})
-- In your love.update and love.draw:
function love.update(dt)
FlexLove.Gui.update(dt)
end
function love.draw()
FlexLove.Gui.draw()
end
```
ADDITIONAL EXAMPLES:
-------------------
1. Creating Colors:
```lua
-- From RGB values (0-1 range)
local red = FlexLove.Color.new(1, 0, 0, 1)
-- From hex string
local blue = FlexLove.Color.fromHex("#0000FF")
local semiTransparent = FlexLove.Color.fromHex("#FF000080")
```
2. Responsive Units:
```lua
-- Viewport-relative units
local container = FlexLove.Element.new({
width = "50vw", -- 50% of viewport width
height = "30vh", -- 30% of viewport height
padding = { horizontal = "2vw", vertical = "1vh" }
})
-- Percentage units (relative to parent)
local child = FlexLove.Element.new({
parent = container,
width = "80%", -- 80% of parent width
height = "50%" -- 50% of parent height
})
```
3. Flexbox Layout:
```lua
-- Horizontal flex container
local row = FlexLove.Element.new({
positioning = FlexLove.Positioning.FLEX,
flexDirection = FlexLove.FlexDirection.HORIZONTAL,
justifyContent = FlexLove.JustifyContent.SPACE_BETWEEN,
alignItems = FlexLove.AlignItems.CENTER,
gap = 10,
width = "80vw",
height = "10vh"
})
-- Add children
for i = 1, 3 do
FlexLove.Element.new({
parent = row,
width = "20vw",
height = "8vh",
text = "Item " .. i
})
end
```
4. Grid Layout:
```lua
-- 3x3 grid
local grid = FlexLove.Element.new({
positioning = FlexLove.Positioning.GRID,
gridRows = 3,
gridColumns = 3,
columnGap = 10,
rowGap = 10,
width = "60vw",
height = "60vh"
})
-- Add 9 children (auto-placed in grid)
for i = 1, 9 do
FlexLove.Element.new({
parent = grid,
text = "Cell " .. i
})
end
```
5. Theming:
```lua
-- Load and activate a theme
FlexLove.Theme.load("space")
FlexLove.Theme.setActive("space")
-- Use theme component
local button = FlexLove.Element.new({
themeComponent = "button",
text = "Themed Button",
callback = function(element, event)
print("Clicked!")
end
})
-- Access theme resources
local primaryColor = FlexLove.Theme.getColor("primary")
local headingFont = FlexLove.Theme.getFont("heading")
```
6. Animations:
```lua
-- Fade animation
local fadeIn = FlexLove.Animation.fade(1.0, 0, 1)
fadeIn:apply(element)
-- Scale animation
local scaleUp = FlexLove.Animation.scale(0.5,
{ width = 100, height = 50 },
{ width = 200, height = 100 }
)
scaleUp:apply(element)
-- Custom animation with easing
local customAnim = FlexLove.Animation.new({
duration = 1.0,
start = { opacity = 0, width = 100 },
final = { opacity = 1, width = 200 },
easing = "easeInOutCubic"
})
customAnim:apply(element)
```
7. Event Handling:
```lua
local button = FlexLove.Element.new({
text = "Interactive",
callback = function(element, event)
if event.type == "click" then
print("Clicked with button:", event.button)
print("Position:", event.x, event.y)
print("Modifiers:", event.modifiers.shift, event.modifiers.ctrl)
elseif event.type == "press" then
print("Button pressed")
elseif event.type == "release" then
print("Button released")
end
end
})
```
VERSION: 1.0.0 VERSION: 1.0.0
LICENSE: MIT LICENSE: MIT
================================================================================ For full documentation, see README.md
]] ]]
-- ==================== -- ====================
@@ -314,6 +97,295 @@ function Color.fromHex(hexWithTag)
end end
end end
-- ====================
-- ImageDataReader
-- ====================
local ImageDataReader = {}
--- Load ImageData from a file path
---@param imagePath string
---@return love.ImageData
function ImageDataReader.loadImageData(imagePath)
if not imagePath then
error(formatError("ImageDataReader", "Image path cannot be nil"))
end
local success, result = pcall(function()
return love.image.newImageData(imagePath)
end)
if not success then
error(formatError("ImageDataReader", "Failed to load image data from '" .. imagePath .. "': " .. tostring(result)))
end
return result
end
--- Extract all pixels from a specific row
---@param imageData love.ImageData
---@param rowIndex number -- 0-based row index
---@return table -- Array of {r, g, b, a} values (0-255 range)
function ImageDataReader.getRow(imageData, rowIndex)
if not imageData then
error(formatError("ImageDataReader", "ImageData cannot be nil"))
end
local width = imageData:getWidth()
local height = imageData:getHeight()
if rowIndex < 0 or rowIndex >= height then
error(formatError("ImageDataReader", string.format("Row index %d out of bounds (height: %d)", rowIndex, height)))
end
local pixels = {}
for x = 0, width - 1 do
local r, g, b, a = imageData:getPixel(x, rowIndex)
table.insert(pixels, {
r = math.floor(r * 255 + 0.5),
g = math.floor(g * 255 + 0.5),
b = math.floor(b * 255 + 0.5),
a = math.floor(a * 255 + 0.5),
})
end
return pixels
end
--- Extract all pixels from a specific column
---@param imageData love.ImageData
---@param colIndex number -- 0-based column index
---@return table -- Array of {r, g, b, a} values (0-255 range)
function ImageDataReader.getColumn(imageData, colIndex)
if not imageData then
error(formatError("ImageDataReader", "ImageData cannot be nil"))
end
local width = imageData:getWidth()
local height = imageData:getHeight()
if colIndex < 0 or colIndex >= width then
error(formatError("ImageDataReader", string.format("Column index %d out of bounds (width: %d)", colIndex, width)))
end
local pixels = {}
for y = 0, height - 1 do
local r, g, b, a = imageData:getPixel(colIndex, y)
table.insert(pixels, {
r = math.floor(r * 255 + 0.5),
g = math.floor(g * 255 + 0.5),
b = math.floor(b * 255 + 0.5),
a = math.floor(a * 255 + 0.5),
})
end
return pixels
end
--- Check if a pixel is black with full alpha (9-patch marker)
---@param r number -- Red (0-255)
---@param g number -- Green (0-255)
---@param b number -- Blue (0-255)
---@param a number -- Alpha (0-255)
---@return boolean
function ImageDataReader.isBlackPixel(r, g, b, a)
return r == 0 and g == 0 and b == 0 and a == 255
end
-- ====================
-- NinePatchParser
-- ====================
local NinePatchParser = {}
--- Find all continuous runs of black pixels in a pixel array
---@param pixels table -- Array of {r, g, b, a} pixel values
---@return table -- Array of {start, end} pairs (1-based indices, inclusive)
local function findBlackPixelRuns(pixels)
local runs = {}
local inRun = false
local runStart = nil
for i = 1, #pixels do
local pixel = pixels[i]
local isBlack = ImageDataReader.isBlackPixel(pixel.r, pixel.g, pixel.b, pixel.a)
if isBlack and not inRun then
-- Start of a new run
inRun = true
runStart = i
elseif not isBlack and inRun then
-- End of current run
table.insert(runs, { start = runStart, ["end"] = i - 1 })
inRun = false
runStart = nil
end
end
-- Handle case where run extends to end of array
if inRun then
table.insert(runs, { start = runStart, ["end"] = #pixels })
end
return runs
end
--- Parse a 9-patch PNG image to extract stretch regions and content padding
---@param imagePath string -- Path to the 9-patch image file
---@return table|nil, string|nil -- Returns {insets, stretchX, stretchY} or nil, error message
function NinePatchParser.parse(imagePath)
if not imagePath then
return nil, "Image path cannot be nil"
end
local success, imageData = pcall(function()
return ImageDataReader.loadImageData(imagePath)
end)
if not success then
return nil, "Failed to load image data: " .. tostring(imageData)
end
local width = imageData:getWidth()
local height = imageData:getHeight()
-- Validate minimum size (must be at least 3x3 with 1px border)
if width < 3 or height < 3 then
return nil, string.format("Invalid 9-patch dimensions: %dx%d (minimum 3x3)", width, height)
end
-- Extract border pixels (0-based indexing, but we convert to 1-based for processing)
local topBorder = ImageDataReader.getRow(imageData, 0)
local leftBorder = ImageDataReader.getColumn(imageData, 0)
local bottomBorder = ImageDataReader.getRow(imageData, height - 1)
local rightBorder = ImageDataReader.getColumn(imageData, width - 1)
-- Remove corner pixels from borders (they're not part of the stretch/content markers)
-- Top and bottom borders: remove first and last pixel
local topStretchPixels = {}
local bottomContentPixels = {}
for i = 2, #topBorder - 1 do
table.insert(topStretchPixels, topBorder[i])
end
for i = 2, #bottomBorder - 1 do
table.insert(bottomContentPixels, bottomBorder[i])
end
-- Left and right borders: remove first and last pixel
local leftStretchPixels = {}
local rightContentPixels = {}
for i = 2, #leftBorder - 1 do
table.insert(leftStretchPixels, leftBorder[i])
end
for i = 2, #rightBorder - 1 do
table.insert(rightContentPixels, rightBorder[i])
end
-- Find stretch regions (top and left borders)
local stretchX = findBlackPixelRuns(topStretchPixels)
local stretchY = findBlackPixelRuns(leftStretchPixels)
-- Find content padding regions (bottom and right borders)
local contentX = findBlackPixelRuns(bottomContentPixels)
local contentY = findBlackPixelRuns(rightContentPixels)
-- Validate that we have at least one stretch region
if #stretchX == 0 or #stretchY == 0 then
return nil, "No stretch regions found (top or left border has no black pixels)"
end
-- Calculate insets from stretch regions
-- Use the first stretch region's start and last stretch region's end
local firstStretchX = stretchX[1]
local lastStretchX = stretchX[#stretchX]
local firstStretchY = stretchY[1]
local lastStretchY = stretchY[#stretchY]
-- If content padding is defined, use it; otherwise use stretch regions
local contentLeft, contentRight, contentTop, contentBottom
if #contentX > 0 then
contentLeft = contentX[1].start
contentRight = #topStretchPixels - contentX[#contentX]["end"]
else
contentLeft = firstStretchX.start
contentRight = #topStretchPixels - lastStretchX["end"]
end
if #contentY > 0 then
contentTop = contentY[1].start
contentBottom = #leftStretchPixels - contentY[#contentY]["end"]
else
contentTop = firstStretchY.start
contentBottom = #leftStretchPixels - lastStretchY["end"]
end
return {
insets = {
left = contentLeft,
top = contentTop,
right = contentRight,
bottom = contentBottom,
},
stretchX = stretchX,
stretchY = stretchY,
}
end
-- ====================
-- ImageScaler
-- ====================
local ImageScaler = {}
--- Scale an ImageData region using nearest-neighbor sampling
--- Produces sharp, pixelated scaling - ideal for pixel art
---@param sourceImageData love.ImageData -- Source image data
---@param srcX number -- Source region X (0-based)
---@param srcY number -- Source region Y (0-based)
---@param srcW number -- Source region width
---@param srcH number -- Source region height
---@param destW number -- Destination width
---@param destH number -- Destination height
---@return love.ImageData -- Scaled image data
function ImageScaler.scaleNearest(sourceImageData, srcX, srcY, srcW, srcH, destW, destH)
if not sourceImageData then
error(formatError("ImageScaler", "Source ImageData cannot be nil"))
end
if srcW <= 0 or srcH <= 0 or destW <= 0 or destH <= 0 then
error(formatError("ImageScaler", "Dimensions must be positive"))
end
-- Create destination ImageData
local destImageData = love.image.newImageData(destW, destH)
-- Calculate scale ratios (cached outside loops for performance)
local scaleX = srcW / destW
local scaleY = srcH / destH
-- Nearest-neighbor sampling
for destY = 0, destH - 1 do
for destX = 0, destW - 1 do
-- Calculate source pixel coordinates using floor (nearest-neighbor)
local srcPixelX = math.floor(destX * scaleX) + srcX
local srcPixelY = math.floor(destY * scaleY) + srcY
-- Clamp to source bounds (safety check)
srcPixelX = math.min(srcPixelX, srcX + srcW - 1)
srcPixelY = math.min(srcPixelY, srcY + srcH - 1)
-- Sample source pixel
local r, g, b, a = sourceImageData:getPixel(srcPixelX, srcPixelY)
-- Write to destination
destImageData:setPixel(destX, destY, r, g, b, a)
end
end
return destImageData
end
-- ==================== -- ====================
-- Theme System -- Theme System
-- ==================== -- ====================
@@ -325,12 +397,17 @@ end
---@field h number -- Height in atlas ---@field h number -- Height in atlas
---@class ThemeComponent ---@class ThemeComponent
---@field atlas string|love.Image? -- Optional: component-specific atlas (overrides theme atlas) ---@field atlas string|love.Image? -- Optional: component-specific atlas (overrides theme atlas). Files ending in .9.png are auto-parsed
---@field insets {left:number, top:number, right:number, bottom:number}? -- Optional: 9-patch insets (auto-extracted from .9.png files or manually defined)
---@field regions {topLeft:ThemeRegion, topCenter:ThemeRegion, topRight:ThemeRegion, middleLeft:ThemeRegion, middleCenter:ThemeRegion, middleRight:ThemeRegion, bottomLeft:ThemeRegion, bottomCenter:ThemeRegion, bottomRight:ThemeRegion} ---@field regions {topLeft:ThemeRegion, topCenter:ThemeRegion, topRight:ThemeRegion, middleLeft:ThemeRegion, middleCenter:ThemeRegion, middleRight:ThemeRegion, bottomLeft:ThemeRegion, bottomCenter:ThemeRegion, bottomRight:ThemeRegion}
---@field stretch {horizontal:table<integer, string>, vertical:table<integer, string>} ---@field stretch {horizontal:table<integer, string>, vertical:table<integer, string>}
---@field states table<string, ThemeComponent>? ---@field states table<string, ThemeComponent>?
---@field contentAutoSizingMultiplier {width:number?, height:number?}? -- Optional: multiplier for auto-sized content dimensions ---@field contentAutoSizingMultiplier {width:number?, height:number?}? -- Optional: multiplier for auto-sized content dimensions
---@field scaleCorners boolean? -- Optional: scale non-stretched regions (corners/edges) with window size. Default: false
---@field scalingAlgorithm "nearest"|"bilinear"? -- Optional: scaling algorithm for non-stretched regions. Default: "bilinear"
---@field _loadedAtlas love.Image? -- Internal: cached loaded atlas image ---@field _loadedAtlas love.Image? -- Internal: cached loaded atlas image
---@field _ninePatchData {insets:table, stretchX:table, stretchY:table}? -- Internal: parsed 9-patch data with multiple stretch regions
---@field _scaledRegionCache table<string, love.Image>? -- Internal: cache for scaled corner/edge images
---@class FontFamily ---@class FontFamily
---@field path string -- Path to the font file (relative to FlexLove or absolute) ---@field path string -- Path to the font file (relative to FlexLove or absolute)
@@ -424,9 +501,6 @@ local function safeLoadImage(imagePath)
end end
end end
--- Create a new theme instance
---@param definition ThemeDefinition
---@return Theme
--- Validate theme definition structure --- Validate theme definition structure
---@param definition ThemeDefinition ---@param definition ThemeDefinition
---@return boolean, string? -- Returns true if valid, or false with error message ---@return boolean, string? -- Returns true if valid, or false with error message
@@ -488,11 +562,28 @@ function Theme.new(definition)
self.fonts = definition.fonts or {} self.fonts = definition.fonts or {}
self.contentAutoSizingMultiplier = definition.contentAutoSizingMultiplier or nil self.contentAutoSizingMultiplier = definition.contentAutoSizingMultiplier or nil
-- Load component-specific atlases -- Load component-specific atlases and process 9-patch definitions
for componentName, component in pairs(self.components) do for componentName, component in pairs(self.components) do
if component.atlas then if component.atlas then
if type(component.atlas) == "string" then if type(component.atlas) == "string" then
local resolvedPath = resolveImagePath(component.atlas) local resolvedPath = resolveImagePath(component.atlas)
-- Check if this is a 9-patch file that needs parsing
local is9Patch = not component.insets and component.atlas:match("%.9%.png$")
-- Parse 9-patch BEFORE loading the image
if is9Patch then
local parseResult, parseErr = NinePatchParser.parse(resolvedPath)
if parseResult then
component.insets = parseResult.insets
component._ninePatchData = parseResult -- Store full data including stretch regions
print("[FlexLove] Auto-parsed 9-patch: " .. component.atlas)
else
print("[FlexLove] Warning: Failed to parse 9-patch '" .. component.atlas .. "': " .. tostring(parseErr))
end
end
-- Now load the image normally
local image, err = safeLoadImage(resolvedPath) local image, err = safeLoadImage(resolvedPath)
if image then if image then
component._loadedAtlas = image component._loadedAtlas = image
@@ -504,17 +595,95 @@ function Theme.new(definition)
end end
end end
-- Also load atlases for component states -- Process 9-patch insets into regions (new format)
if component.insets then
local atlasImage = component._loadedAtlas or self.atlas
if atlasImage then
local imgWidth, imgHeight = atlasImage:getDimensions()
local left = component.insets.left or 0
local top = component.insets.top or 0
local right = component.insets.right or 0
local bottom = component.insets.bottom or 0
-- Calculate center dimensions
local centerWidth = imgWidth - left - right
local centerHeight = imgHeight - top - bottom
-- Generate regions from insets
component.regions = {
topLeft = { x = 0, y = 0, w = left, h = top },
topCenter = { x = left, y = 0, w = centerWidth, h = top },
topRight = { x = left + centerWidth, y = 0, w = right, h = top },
middleLeft = { x = 0, y = top, w = left, h = centerHeight },
middleCenter = { x = left, y = top, w = centerWidth, h = centerHeight },
middleRight = { x = left + centerWidth, y = top, w = right, h = centerHeight },
bottomLeft = { x = 0, y = top + centerHeight, w = left, h = bottom },
bottomCenter = { x = left, y = top + centerHeight, w = centerWidth, h = bottom },
bottomRight = { x = left + centerWidth, y = top + centerHeight, w = right, h = bottom },
}
end
end
-- Also load atlases for component states and process their 9-patch definitions
if component.states then if component.states then
for stateName, stateComponent in pairs(component.states) do for stateName, stateComponent in pairs(component.states) do
if stateComponent.atlas then if stateComponent.atlas then
if type(stateComponent.atlas) == "string" then if type(stateComponent.atlas) == "string" then
local resolvedPath = resolveImagePath(stateComponent.atlas) local resolvedPath = resolveImagePath(stateComponent.atlas)
stateComponent._loadedAtlas = love.graphics.newImage(resolvedPath)
-- Check if this is a 9-patch file that needs parsing
local is9Patch = not stateComponent.insets and stateComponent.atlas:match("%.9%.png$")
-- Parse 9-patch BEFORE loading the image
if is9Patch then
local parseResult, parseErr = NinePatchParser.parse(resolvedPath)
if parseResult then
stateComponent.insets = parseResult.insets
stateComponent._ninePatchData = parseResult
print("[FlexLove] Auto-parsed 9-patch state '" .. stateName .. "': " .. stateComponent.atlas)
else
print("[FlexLove] Warning: Failed to parse 9-patch state '" .. stateName .. "': " .. tostring(parseErr))
end
end
-- Now load the image normally
local image, imgErr = safeLoadImage(resolvedPath)
if image then
stateComponent._loadedAtlas = image
else
print("[FlexLove] Warning: Failed to load state atlas '" .. stateName .. "': " .. tostring(imgErr))
end
else else
stateComponent._loadedAtlas = stateComponent.atlas stateComponent._loadedAtlas = stateComponent.atlas
end end
end end
-- Process 9-patch insets for state components
if stateComponent.insets then
local atlasImage = stateComponent._loadedAtlas or component._loadedAtlas or self.atlas
if atlasImage then
local imgWidth, imgHeight = atlasImage:getDimensions()
local left = stateComponent.insets.left or 0
local top = stateComponent.insets.top or 0
local right = stateComponent.insets.right or 0
local bottom = stateComponent.insets.bottom or 0
local centerWidth = imgWidth - left - right
local centerHeight = imgHeight - top - bottom
stateComponent.regions = {
topLeft = { x = 0, y = 0, w = left, h = top },
topCenter = { x = left, y = 0, w = centerWidth, h = top },
topRight = { x = left + centerWidth, y = 0, w = right, h = top },
middleLeft = { x = 0, y = top, w = left, h = centerHeight },
middleCenter = { x = left, y = top, w = centerWidth, h = centerHeight },
middleRight = { x = left + centerWidth, y = top, w = right, h = centerHeight },
bottomLeft = { x = 0, y = top + centerHeight, w = left, h = bottom },
bottomCenter = { x = left, y = top + centerHeight, w = centerWidth, h = bottom },
bottomRight = { x = left + centerWidth, y = top + centerHeight, w = right, h = bottom },
}
end
end
end end
end end
end end
@@ -781,16 +950,16 @@ end
local NineSlice = {} local NineSlice = {}
--- Draw a 9-slice component with borders in padding area --- Draw a 9-patch component using Android-style rendering
--- Corners are never scaled (1:1 pixels), edges stretch in one dimension only
---@param component ThemeComponent ---@param component ThemeComponent
---@param atlas love.Image ---@param atlas love.Image
---@param x number -- X position of border box (top-left corner) ---@param x number -- X position (top-left corner)
---@param y number -- Y position of border box (top-left corner) ---@param y number -- Y position (top-left corner)
---@param contentWidth number -- Width of content area (excludes padding) ---@param width number -- Total width (border-box)
---@param contentHeight number -- Height of content area (excludes padding) ---@param height number -- Total height (border-box)
---@param padding {top:number, right:number, bottom:number, left:number} -- Padding defines border thickness
---@param opacity number? ---@param opacity number?
function NineSlice.draw(component, atlas, x, y, contentWidth, contentHeight, padding, opacity) function NineSlice.draw(component, atlas, x, y, width, height, opacity)
if not component or not atlas then if not component or not atlas then
return return
end end
@@ -800,102 +969,54 @@ function NineSlice.draw(component, atlas, x, y, contentWidth, contentHeight, pad
local regions = component.regions local regions = component.regions
-- Calculate source image border dimensions from regions -- Extract border dimensions from regions (in pixels)
local sourceBorderLeft = regions.topLeft.w local left = regions.topLeft.w
local sourceBorderRight = regions.topRight.w local right = regions.topRight.w
local sourceBorderTop = regions.topLeft.h local top = regions.topLeft.h
local sourceBorderBottom = regions.bottomLeft.h local bottom = regions.bottomLeft.h
local sourceCenterWidth = regions.middleCenter.w local centerW = regions.middleCenter.w
local sourceCenterHeight = regions.middleCenter.h local centerH = regions.middleCenter.h
-- Calculate scale factors to fit borders within padding -- Calculate content area (space remaining after borders)
-- Borders scale to fit the padding dimensions local contentWidth = width - left - right
local scaleLeft = padding.left / sourceBorderLeft local contentHeight = height - top - bottom
local scaleRight = padding.right / sourceBorderRight
local scaleTop = padding.top / sourceBorderTop -- Clamp to prevent negative dimensions
local scaleBottom = padding.bottom / sourceBorderBottom contentWidth = math.max(0, contentWidth)
contentHeight = math.max(0, contentHeight)
-- Calculate stretch scales for edges and center
local scaleX = contentWidth / centerW
local scaleY = contentHeight / centerH
-- Create quads for each region -- Create quads for each region
local atlasWidth, atlasHeight = atlas:getDimensions() local atlasWidth, atlasHeight = atlas:getDimensions()
-- Helper to create quad
local function makeQuad(region) local function makeQuad(region)
return love.graphics.newQuad(region.x, region.y, region.w, region.h, atlasWidth, atlasHeight) return love.graphics.newQuad(region.x, region.y, region.w, region.h, atlasWidth, atlasHeight)
end end
-- Top-left corner (scales to fit top-left padding) -- CORNERS (no scaling - 1:1 pixel perfect)
love.graphics.draw(atlas, makeQuad(regions.topLeft), x, y, 0, scaleLeft, scaleTop) love.graphics.draw(atlas, makeQuad(regions.topLeft), x, y)
love.graphics.draw(atlas, makeQuad(regions.topRight), x + left + contentWidth, y)
love.graphics.draw(atlas, makeQuad(regions.bottomLeft), x, y + top + contentHeight)
love.graphics.draw(atlas, makeQuad(regions.bottomRight), x + left + contentWidth, y + top + contentHeight)
-- Top-right corner (scales to fit top-right padding) -- TOP/BOTTOM EDGES (stretch horizontally only)
love.graphics.draw(atlas, makeQuad(regions.topRight), x + padding.left + contentWidth, y, 0, scaleRight, scaleTop)
-- Bottom-left corner (scales to fit bottom-left padding)
love.graphics.draw(atlas, makeQuad(regions.bottomLeft), x, y + padding.top + contentHeight, 0, scaleLeft, scaleBottom)
-- Bottom-right corner (scales to fit bottom-right padding)
love.graphics.draw(
atlas,
makeQuad(regions.bottomRight),
x + padding.left + contentWidth,
y + padding.top + contentHeight,
0,
scaleRight,
scaleBottom
)
-- Top edge (stretched to content width, scaled to padding.top height)
if contentWidth > 0 then if contentWidth > 0 then
local stretchScaleX = contentWidth / sourceCenterWidth love.graphics.draw(atlas, makeQuad(regions.topCenter), x + left, y, 0, scaleX, 1)
love.graphics.draw(atlas, makeQuad(regions.topCenter), x + padding.left, y, 0, stretchScaleX, scaleTop) love.graphics.draw(atlas, makeQuad(regions.bottomCenter), x + left, y + top + contentHeight, 0, scaleX, 1)
end end
-- Bottom edge (stretched to content width, scaled to padding.bottom height) -- LEFT/RIGHT EDGES (stretch vertically only)
if contentWidth > 0 then
local stretchScaleX = contentWidth / sourceCenterWidth
love.graphics.draw(
atlas,
makeQuad(regions.bottomCenter),
x + padding.left,
y + padding.top + contentHeight,
0,
stretchScaleX,
scaleBottom
)
end
-- Left edge (scaled to padding.left width, stretched to content height)
if contentHeight > 0 then if contentHeight > 0 then
local stretchScaleY = contentHeight / sourceCenterHeight love.graphics.draw(atlas, makeQuad(regions.middleLeft), x, y + top, 0, 1, scaleY)
love.graphics.draw(atlas, makeQuad(regions.middleLeft), x, y + padding.top, 0, scaleLeft, stretchScaleY) love.graphics.draw(atlas, makeQuad(regions.middleRight), x + left + contentWidth, y + top, 0, 1, scaleY)
end end
-- Right edge (scaled to padding.right width, stretched to content height) -- CENTER (stretch both dimensions)
if contentHeight > 0 then
local stretchScaleY = contentHeight / sourceCenterHeight
love.graphics.draw(
atlas,
makeQuad(regions.middleRight),
x + padding.left + contentWidth,
y + padding.top,
0,
scaleRight,
stretchScaleY
)
end
-- Center (stretched to fill content area)
if contentWidth > 0 and contentHeight > 0 then if contentWidth > 0 and contentHeight > 0 then
local stretchScaleX = contentWidth / sourceCenterWidth love.graphics.draw(atlas, makeQuad(regions.middleCenter), x + left, y + top, 0, scaleX, scaleY)
local stretchScaleY = contentHeight / sourceCenterHeight
love.graphics.draw(
atlas,
makeQuad(regions.middleCenter),
x + padding.left,
y + padding.top,
0,
stretchScaleX,
stretchScaleY
)
end end
-- Reset color -- Reset color
@@ -3308,8 +3429,10 @@ function Element:draw()
and component.regions.bottomCenter and component.regions.bottomCenter
and component.regions.bottomRight and component.regions.bottomRight
if hasAllRegions then if hasAllRegions then
-- NineSlice.draw expects content dimensions (without padding), not border-box -- Calculate border-box dimensions (content + padding)
NineSlice.draw(component, atlasToUse, self.x, self.y, self.width, self.height, self.padding, self.opacity) local borderBoxWidth = self.width + self.padding.left + self.padding.right
local borderBoxHeight = self.height + self.padding.top + self.padding.bottom
NineSlice.draw(component, atlasToUse, self.x, self.y, borderBoxWidth, borderBoxHeight, self.opacity)
else else
-- Silently skip drawing if component structure is invalid -- Silently skip drawing if component structure is invalid
end end
@@ -3776,7 +3899,9 @@ function Element:recalculateUnits(newViewportWidth, newViewportHeight)
-- - If element has a parent: use parent's border-box dimensions (CSS spec for child elements) -- - If element has a parent: use parent's border-box dimensions (CSS spec for child elements)
-- - If element has no parent: use element's own border-box dimensions (CSS spec for root elements) -- - If element has no parent: use element's own border-box dimensions (CSS spec for root elements)
local parentBorderBoxWidth = self.parent and self.parent._borderBoxWidth or self._borderBoxWidth or newViewportWidth local parentBorderBoxWidth = self.parent and self.parent._borderBoxWidth or self._borderBoxWidth or newViewportWidth
local parentBorderBoxHeight = self.parent and self.parent._borderBoxHeight or self._borderBoxHeight or newViewportHeight local parentBorderBoxHeight = self.parent and self.parent._borderBoxHeight
or self._borderBoxHeight
or newViewportHeight
-- Handle shorthand properties first (horizontal/vertical) -- Handle shorthand properties first (horizontal/vertical)
local resolvedHorizontalPadding = nil local resolvedHorizontalPadding = nil
@@ -4135,6 +4260,8 @@ Gui.new = Element.new
Gui.Element = Element Gui.Element = Element
Gui.Animation = Animation Gui.Animation = Animation
Gui.Theme = Theme Gui.Theme = Theme
Gui.ImageDataReader = ImageDataReader
Gui.NinePatchParser = NinePatchParser
-- Export individual enums for convenience -- Export individual enums for convenience
return { return {
@@ -4144,6 +4271,9 @@ return {
Color = Color, Color = Color,
Theme = Theme, Theme = Theme,
Animation = Animation, Animation = Animation,
ImageScaler = ImageScaler,
ImageDataReader = ImageDataReader,
NinePatchParser = NinePatchParser,
enums = enums, enums = enums,
-- Export individual enums at top level -- Export individual enums at top level
Positioning = Positioning, Positioning = Positioning,

154
README.md
View File

@@ -1,9 +1,20 @@
# FlexLöve # FlexLöve
A Löve GUI library based on Flexbox with theming and animation support **A comprehensive UI library providing flexbox/grid layouts, theming, animations, and event handling for LÖVE2D games.**
FlexLöve is a lightweight, flexible GUI library for Löve2D that implements a flexbox-based layout system. It provides a simple way to create and manage UI elements with automatic layout calculations, animations, theming, and responsive design. FlexLöve is a lightweight, flexible GUI library for Löve2D that implements a flexbox-based layout system. It provides a simple way to create and manage UI elements with automatic layout calculations, animations, theming, and responsive design.
## Architecture Overview
1. **Color System** - RGBA color utilities with hex conversion
2. **Theme System** - 9-slice theming with state support (normal/hover/pressed/disabled)
- Automatic Android 9-patch (*.9.png) parsing with multi-region support
3. **Units System** - Responsive units (px, %, vw, vh, ew, eh) with viewport scaling
4. **Layout System** - Flexbox, Grid, Absolute, and Relative positioning
5. **Event System** - Mouse/touch events with z-index ordering
6. **Animation System** - Interpolation with easing functions
7. **GUI Manager** - Top-level manager for elements and global state
## ⚠️ Development Status ## ⚠️ Development Status
This library is under active development. While many features are functional, some aspects may change or have incomplete/broken implementations. This library is under active development. While many features are functional, some aspects may change or have incomplete/broken implementations.
@@ -15,6 +26,7 @@ This library is under active development. While many features are functional, so
- **Element Management**: Hierarchical element structures with automatic sizing - **Element Management**: Hierarchical element structures with automatic sizing
- **Interactive Elements**: Buttons with click detection, event system, and callbacks - **Interactive Elements**: Buttons with click detection, event system, and callbacks
- **Theme System**: 9-slice/9-patch theming with state support (normal, hover, pressed, disabled) - **Theme System**: 9-slice/9-patch theming with state support (normal, hover, pressed, disabled)
- **Android 9-Patch Auto-Parsing**: Automatic parsing of *.9.png files with multi-region support
- **Animations**: Built-in animation support for transitions and effects - **Animations**: Built-in animation support for transitions and effects
- **Responsive Design**: Automatic resizing with viewport units (vw, vh, %) - **Responsive Design**: Automatic resizing with viewport units (vw, vh, %)
- **Color Handling**: Utility classes for managing colors in various formats - **Color Handling**: Utility classes for managing colors in various formats
@@ -36,62 +48,52 @@ local Color = FlexLove.Color
```lua ```lua
local FlexLove = require("FlexLove") local FlexLove = require("FlexLove")
local Gui = FlexLove.GUI
local Color = FlexLove.Color
function love.load() -- Initialize with base scaling and theme
-- Initialize GUI system FlexLove.Gui.init({
Gui.init({ baseScale = { width = 1920, height = 1080 },
baseScale = { width = 1920, height = 1080 } theme = "space"
}) })
-- Create a container -- Create a button with flexbox layout
local container = Gui.new({ local button = FlexLove.Element.new({
x = 100, width = "20vw",
y = 100, height = "10vh",
width = 400, backgroundColor = FlexLove.Color.new(0.2, 0.2, 0.8, 1),
height = 300,
backgroundColor = Color.new(0.2, 0.2, 0.2, 1),
cornerRadius = 10,
border = { top = true, bottom = true, left = true, right = true },
borderColor = Color.new(0.8, 0.8, 0.8, 1),
positioning = "flex",
flexDirection = "vertical",
gap = 10,
padding = { top = 20, right = 20, bottom = 20, left = 20 }
})
-- Create a button
local button = Gui.new({
parent = container,
width = 200,
height = 50,
text = "Click Me", text = "Click Me",
textAlign = "center", textSize = "md",
textColor = Color.new(1, 1, 1, 1), themeComponent = "button",
backgroundColor = Color.new(0.2, 0.6, 0.9, 1),
cornerRadius = 8,
callback = function(element, event) callback = function(element, event)
if event.type == "click" then
print("Button clicked!") print("Button clicked!")
end end
end
}) })
end
-- In your love.update and love.draw:
function love.update(dt) function love.update(dt)
Gui.update(dt) FlexLove.Gui.update(dt)
end end
function love.draw() function love.draw()
Gui.draw() FlexLove.Gui.draw()
end
function love.resize(w, h)
Gui.resize()
end end
``` ```
## API Conventions
### Method Patterns
- **Constructors**: `ClassName.new(props)` → instance
- **Static Methods**: `ClassName.methodName(args)` → result
- **Instance Methods**: `instance:methodName(args)` → result
- **Getters**: `instance:getPropertyName()` → value
- **Internal Fields**: `_fieldName` (private, do not access directly)
- **Error Handling**: Constructors throw errors, utility functions return nil + error string
### Return Value Patterns
- **Single Success**: return value
- **Success/Failure**: return result, errorMessage (nil on success for error)
- **Multiple Values**: return value1, value2 (documented in @return)
- **Constructors**: Always return instance (never nil)
## Core Concepts ## Core Concepts
### Element Properties ### Element Properties
@@ -227,6 +229,36 @@ local button = Gui.new({
}) })
``` ```
#### Android 9-Patch Support
FlexLove automatically parses Android 9-patch (*.9.png) files:
```lua
-- Theme definition with auto-parsed 9-patch
{
name = "My Theme",
components = {
button = {
atlas = "themes/mytheme/button.9.png"
-- insets automatically extracted from 9-patch borders
-- supports multiple stretch regions for complex scaling
},
panel = {
atlas = "themes/mytheme/panel.png",
insets = { left = 20, top = 20, right = 20, bottom = 20 }
-- manual insets still supported (overrides auto-parsing)
}
}
}
```
**9-Patch Format:**
- Files ending in `.9.png` are automatically detected and parsed
- Top/left borders define stretchable regions (black pixels)
- Bottom/right borders define content padding (optional)
- Supports multiple non-contiguous stretch regions
- Manual insets override auto-parsing when specified
Themes support state-based rendering: Themes support state-based rendering:
- `normal` - Default state - `normal` - Default state
- `hover` - Mouse over element - `hover` - Mouse over element
@@ -273,18 +305,35 @@ Create smooth transitions:
local Animation = FlexLove.Animation local Animation = FlexLove.Animation
-- Fade animation -- Fade animation
element.animation = Animation.fade(1.0, 0, 1) local fadeIn = FlexLove.Animation.fade(1.0, 0, 1)
fadeIn:apply(element)
-- Scale animation -- Scale animation
element.animation = Animation.scale(0.5, 1, 1.2) local scaleUp = FlexLove.Animation.scale(0.5,
{ width = 100, height = 50 },
{ width = 200, height = 100 }
)
scaleUp:apply(element)
-- Custom animation -- Custom animation with easing
element.animation = Animation.new({ local customAnim = FlexLove.Animation.new({
duration = 1.0, duration = 1.0,
from = { width = 100, height = 50 }, start = { opacity = 0, width = 100 },
to = { width = 200, height = 100 }, final = { opacity = 1, width = 200 },
easing = "easeInOut" easing = "easeInOutCubic"
}) })
customAnim:apply(element)
```
### Creating Colors
```lua
-- From RGB values (0-1 range)
local red = FlexLove.Color.new(1, 0, 0, 1)
-- From hex string
local blue = FlexLove.Color.fromHex("#0000FF")
local semiTransparent = FlexLove.Color.fromHex("#FF000080")
``` ```
## API Reference ## API Reference
@@ -375,6 +424,15 @@ lua testing/runAll.lua
lua testing/__tests__/<specific_test> lua testing/__tests__/<specific_test>
``` ```
## Version & Compatibility
**Current Version**: 1.0.0
**Compatibility:**
- **Lua**: 5.1+
- **LÖVE**: 11.x (tested)
- **LuaJIT**: Compatible
## License ## License
MIT License - see LICENSE file for details. MIT License - see LICENSE file for details.

5
testing/__tests__/20_padding_resize_tests.lua
View File

@@ -1,4 +1,5 @@
-- Test padding resize behavior with percentage units -- Test padding resize behavior with percentage units
package.path = package.path .. ";?.lua"
local luaunit = require("testing.luaunit") local luaunit = require("testing.luaunit")
local FlexLove = require("FlexLove") local FlexLove = require("FlexLove")
@@ -13,7 +14,7 @@ function TestPaddingResize:setUp()
-- Initialize with base scaling -- Initialize with base scaling
FlexLove.Gui.init({ FlexLove.Gui.init({
baseScale = { width = 1920, height = 1080 } baseScale = { width = 1920, height = 1080 },
}) })
end end
@@ -237,4 +238,4 @@ function TestPaddingResize:testMixedPaddingUnits()
luaunit.assertTrue(initialLeft < element.padding.left, "Left padding (vh) should increase") luaunit.assertTrue(initialLeft < element.padding.left, "Left padding (vh) should increase")
end end
return TestPaddingResize luaunit.LuaUnit.run()

99
testing/__tests__/21_ninepatch_parser_tests.lua Normal file
View File

@@ -0,0 +1,99 @@
-- Test Suite for NinePatch Parser
-- Tests ImageDataReader and NinePatchParser modules
package.path = package.path .. ";?.lua"
local lu = require("testing.luaunit")
-- Mock love.graphics for testing without LÖVE runtime
local love = love
if not love then
love = {}
love.graphics = {}
love.timer = {}
love.window = {}
-- Mock functions
function love.timer.getTime()
return 0
end
function love.window.getMode()
return 800, 600
end
end
-- Load FlexLove
local FlexLove = require("FlexLove")
-- ====================
-- Test ImageDataReader
-- ====================
TestImageDataReader = {}
function TestImageDataReader:test_isBlackPixel_identifiesBlackCorrectly()
-- Black pixel with full alpha should return true
lu.assertTrue(FlexLove.ImageDataReader.isBlackPixel(0, 0, 0, 255))
end
function TestImageDataReader:test_isBlackPixel_rejectsNonBlack()
-- Non-black colors should return false
lu.assertFalse(FlexLove.ImageDataReader.isBlackPixel(255, 0, 0, 255)) -- Red
lu.assertFalse(FlexLove.ImageDataReader.isBlackPixel(0, 255, 0, 255)) -- Green
lu.assertFalse(FlexLove.ImageDataReader.isBlackPixel(0, 0, 255, 255)) -- Blue
lu.assertFalse(FlexLove.ImageDataReader.isBlackPixel(128, 128, 128, 255)) -- Gray
end
function TestImageDataReader:test_isBlackPixel_rejectsTransparent()
-- Black with no alpha should return false
lu.assertFalse(FlexLove.ImageDataReader.isBlackPixel(0, 0, 0, 0))
lu.assertFalse(FlexLove.ImageDataReader.isBlackPixel(0, 0, 0, 128))
end
-- ====================
-- Test NinePatchParser Helper Functions
-- ====================
TestNinePatchParserHelpers = {}
-- Note: findBlackPixelRuns is a local function, so we test it indirectly through parse()
-- We'll create mock image data to test the full parsing pipeline
-- ====================
-- Integration Tests
-- ====================
TestNinePatchIntegration = {}
function TestNinePatchIntegration:test_themeLoadsWithNinePatch()
-- This test verifies that the space theme can load with 9-patch button
local success, err = pcall(function()
FlexLove.Theme.load("space")
end)
if not success then
print("Theme load error: " .. tostring(err))
end
lu.assertTrue(success, "Space theme should load successfully")
end
function TestNinePatchIntegration:test_ninePatchButtonHasInsets()
-- Load theme and verify button component has insets
FlexLove.Theme.load("space")
local theme = FlexLove.Theme.getActive()
lu.assertNotNil(theme, "Theme should be active")
lu.assertNotNil(theme.components, "Theme should have components")
if theme.components and theme.components.button then
-- Check if insets were auto-parsed or manually defined
local hasInsets = theme.components.button.insets ~= nil or theme.components.button.regions ~= nil
lu.assertTrue(hasInsets, "Button should have insets or regions defined")
else
lu.fail("Button component not found in theme")
end
end
-- Run tests
lu.LuaUnit.run()

202
testing/__tests__/22_image_scaler_nearest_tests.lua Normal file
View File

@@ -0,0 +1,202 @@
package.path = package.path .. ";?.lua"
local luaunit = require("testing.luaunit")
local loveStub = require("testing.loveStub")
_G.love = loveStub
local FlexLove = require("FlexLove")
TestImageScalerNearest = {}
function TestImageScalerNearest:setUp()
-- Create a simple test image (2x2 with distinct colors)
self.testImage2x2 = love.image.newImageData(2, 2)
-- Top-left: red
self.testImage2x2:setPixel(0, 0, 1, 0, 0, 1)
-- Top-right: green
self.testImage2x2:setPixel(1, 0, 0, 1, 0, 1)
-- Bottom-left: blue
self.testImage2x2:setPixel(0, 1, 0, 0, 1, 1)
-- Bottom-right: white
self.testImage2x2:setPixel(1, 1, 1, 1, 1, 1)
end
function TestImageScalerNearest:test2xScaling()
-- Scale 2x2 to 4x4 (2x factor)
local scaled = FlexLove.ImageScaler.scaleNearest(self.testImage2x2, 0, 0, 2, 2, 4, 4)
luaunit.assertEquals(scaled:getWidth(), 4)
luaunit.assertEquals(scaled:getHeight(), 4)
-- Top-left quadrant should be red (0,0 -> 1,1)
local r, g, b, a = scaled:getPixel(0, 0)
luaunit.assertAlmostEquals(r, 1, 0.01)
luaunit.assertAlmostEquals(g, 0, 0.01)
luaunit.assertAlmostEquals(b, 0, 0.01)
r, g, b, a = scaled:getPixel(1, 1)
luaunit.assertAlmostEquals(r, 1, 0.01)
luaunit.assertAlmostEquals(g, 0, 0.01)
luaunit.assertAlmostEquals(b, 0, 0.01)
-- Top-right quadrant should be green (2,0 -> 3,1)
r, g, b, a = scaled:getPixel(2, 0)
luaunit.assertAlmostEquals(r, 0, 0.01)
luaunit.assertAlmostEquals(g, 1, 0.01)
luaunit.assertAlmostEquals(b, 0, 0.01)
r, g, b, a = scaled:getPixel(3, 1)
luaunit.assertAlmostEquals(r, 0, 0.01)
luaunit.assertAlmostEquals(g, 1, 0.01)
luaunit.assertAlmostEquals(b, 0, 0.01)
-- Bottom-left quadrant should be blue (0,2 -> 1,3)
r, g, b, a = scaled:getPixel(0, 2)
luaunit.assertAlmostEquals(r, 0, 0.01)
luaunit.assertAlmostEquals(g, 0, 0.01)
luaunit.assertAlmostEquals(b, 1, 0.01)
-- Bottom-right quadrant should be white (2,2 -> 3,3)
r, g, b, a = scaled:getPixel(3, 3)
luaunit.assertAlmostEquals(r, 1, 0.01)
luaunit.assertAlmostEquals(g, 1, 0.01)
luaunit.assertAlmostEquals(b, 1, 0.01)
end
function TestImageScalerNearest:test3xScaling()
-- Scale 2x2 to 6x6 (3x factor)
local scaled = FlexLove.ImageScaler.scaleNearest(self.testImage2x2, 0, 0, 2, 2, 6, 6)
luaunit.assertEquals(scaled:getWidth(), 6)
luaunit.assertEquals(scaled:getHeight(), 6)
-- Verify nearest-neighbor: each source pixel should map to 3x3 block
-- Top-left (red) should cover 0-2, 0-2
local r, g, b = scaled:getPixel(0, 0)
luaunit.assertAlmostEquals(r, 1, 0.01)
r, g, b = scaled:getPixel(2, 2)
luaunit.assertAlmostEquals(r, 1, 0.01)
-- Top-right (green) should cover 3-5, 0-2
r, g, b = scaled:getPixel(3, 0)
luaunit.assertAlmostEquals(g, 1, 0.01)
r, g, b = scaled:getPixel(5, 2)
luaunit.assertAlmostEquals(g, 1, 0.01)
end
function TestImageScalerNearest:testNonUniformScaling()
-- Scale 2x2 to 6x4 (3x horizontal, 2x vertical)
local scaled = FlexLove.ImageScaler.scaleNearest(self.testImage2x2, 0, 0, 2, 2, 6, 4)
luaunit.assertEquals(scaled:getWidth(), 6)
luaunit.assertEquals(scaled:getHeight(), 4)
-- Top-left red should cover 0-2 horizontally, 0-1 vertically
local r, g, b = scaled:getPixel(0, 0)
luaunit.assertAlmostEquals(r, 1, 0.01)
r, g, b = scaled:getPixel(2, 1)
luaunit.assertAlmostEquals(r, 1, 0.01)
-- Top-right green should cover 3-5 horizontally, 0-1 vertically
r, g, b = scaled:getPixel(3, 0)
luaunit.assertAlmostEquals(g, 1, 0.01)
end
function TestImageScalerNearest:testSameSizeScaling()
-- Scale 2x2 to 2x2 (should be identical)
local scaled = FlexLove.ImageScaler.scaleNearest(self.testImage2x2, 0, 0, 2, 2, 2, 2)
luaunit.assertEquals(scaled:getWidth(), 2)
luaunit.assertEquals(scaled:getHeight(), 2)
-- Verify all pixels match original
for y = 0, 1 do
for x = 0, 1 do
local r1, g1, b1, a1 = self.testImage2x2:getPixel(x, y)
local r2, g2, b2, a2 = scaled:getPixel(x, y)
luaunit.assertAlmostEquals(r1, r2, 0.01)
luaunit.assertAlmostEquals(g1, g2, 0.01)
luaunit.assertAlmostEquals(b1, b2, 0.01)
luaunit.assertAlmostEquals(a1, a2, 0.01)
end
end
end
function TestImageScalerNearest:test1x1Scaling()
-- Create 1x1 image
local img1x1 = love.image.newImageData(1, 1)
img1x1:setPixel(0, 0, 0.5, 0.5, 0.5, 1)
-- Scale to 4x4
local scaled = FlexLove.ImageScaler.scaleNearest(img1x1, 0, 0, 1, 1, 4, 4)
luaunit.assertEquals(scaled:getWidth(), 4)
luaunit.assertEquals(scaled:getHeight(), 4)
-- All pixels should be the same color
for y = 0, 3 do
for x = 0, 3 do
local r, g, b = scaled:getPixel(x, y)
luaunit.assertAlmostEquals(r, 0.5, 0.01)
luaunit.assertAlmostEquals(g, 0.5, 0.01)
luaunit.assertAlmostEquals(b, 0.5, 0.01)
end
end
end
function TestImageScalerNearest:testSubregionScaling()
-- Create 4x4 image with different quadrants
local img4x4 = love.image.newImageData(4, 4)
-- Fill with pattern: top-left red, rest black
for y = 0, 3 do
for x = 0, 3 do
if x < 2 and y < 2 then
img4x4:setPixel(x, y, 1, 0, 0, 1) -- red
else
img4x4:setPixel(x, y, 0, 0, 0, 1) -- black
end
end
end
-- Scale only the top-left 2x2 red quadrant to 4x4
local scaled = FlexLove.ImageScaler.scaleNearest(img4x4, 0, 0, 2, 2, 4, 4)
luaunit.assertEquals(scaled:getWidth(), 4)
luaunit.assertEquals(scaled:getHeight(), 4)
-- All pixels should be red (from source quadrant)
for y = 0, 3 do
for x = 0, 3 do
local r, g, b = scaled:getPixel(x, y)
luaunit.assertAlmostEquals(r, 1, 0.01)
luaunit.assertAlmostEquals(g, 0, 0.01)
luaunit.assertAlmostEquals(b, 0, 0.01)
end
end
end
function TestImageScalerNearest:testAlphaChannel()
-- Create image with varying alpha
local img = love.image.newImageData(2, 2)
img:setPixel(0, 0, 1, 0, 0, 1.0) -- Opaque red
img:setPixel(1, 0, 0, 1, 0, 0.5) -- Semi-transparent green
img:setPixel(0, 1, 0, 0, 1, 0.25) -- More transparent blue
img:setPixel(1, 1, 1, 1, 1, 0.0) -- Fully transparent white
local scaled = FlexLove.ImageScaler.scaleNearest(img, 0, 0, 2, 2, 4, 4)
-- Check alpha values are preserved
local r, g, b, a = scaled:getPixel(0, 0)
luaunit.assertAlmostEquals(a, 1.0, 0.01)
r, g, b, a = scaled:getPixel(2, 0)
luaunit.assertAlmostEquals(a, 0.5, 0.01)
r, g, b, a = scaled:getPixel(0, 2)
luaunit.assertAlmostEquals(a, 0.25, 0.01)
r, g, b, a = scaled:getPixel(3, 3)
luaunit.assertAlmostEquals(a, 0.0, 0.01)
end
luaunit.LuaUnit.run()

5
testing/runAll.lua
View File

@@ -23,9 +23,11 @@ local testFiles = {
"testing/__tests__/17_sibling_space_reservation_tests.lua", "testing/__tests__/17_sibling_space_reservation_tests.lua",
"testing/__tests__/18_font_family_inheritance_tests.lua", "testing/__tests__/18_font_family_inheritance_tests.lua",
"testing/__tests__/19_negative_margin_tests.lua", "testing/__tests__/19_negative_margin_tests.lua",
"testing/__tests__/20_padding_resize_tests.lua",
"testing/__tests__/21_ninepatch_parser_tests.lua",
"testing/__tests__/22_image_scaler_nearest_tests.lua",
} }
-- testingun all tests, but don't exit on error
local success = true local success = true
print("========================================") print("========================================")
print("Running ALL tests") print("Running ALL tests")
@@ -45,6 +47,5 @@ print("========================================")
print("All tests completed") print("All tests completed")
print("========================================") print("========================================")
-- Run the tests and exit with appropriate code
local result = luaunit.LuaUnit.run() local result = luaunit.LuaUnit.run()
os.exit(success and result or 1) os.exit(success and result or 1)

52
themes/README.md
View File

@@ -347,6 +347,57 @@ Gui.new({
}) })
``` ```
## Corner Scaling
By default, 9-slice corners and non-stretched edges are rendered at their original pixel size (1:1). For pixel-art themes or when you want corners to scale with the window, you can enable corner scaling:
### Enabling Corner Scaling
```lua
-- themes/my_theme.lua
return {
name = "My Theme",
components = {
button = {
atlas = "themes/button.png",
insets = { left = 8, top = 8, right = 8, bottom = 8 },
scaleCorners = true, -- Enable corner scaling
scalingAlgorithm = "bilinear" -- "bilinear" (smooth) or "nearest" (sharp/pixelated)
}
}
}
```
### Scaling Algorithms
- **`bilinear`** (default): Smooth interpolation between pixels. Best for most use cases.
- **`nearest`**: Nearest-neighbor sampling. Best for pixel art that should maintain sharp edges.
### When to Use Corner Scaling
- **Pixel art themes**: Use `scaleCorners = true` with `scalingAlgorithm = "nearest"` to maintain crisp pixel boundaries
- **High DPI displays**: Use `scaleCorners = true` with `scalingAlgorithm = "bilinear"` for smooth scaling
- **Fixed-size UI**: Keep `scaleCorners = false` (default) for pixel-perfect rendering at original size
### Per-State Scaling
You can also set scaling per-state:
```lua
button = {
atlas = "themes/button_normal.png",
scaleCorners = true,
scalingAlgorithm = "bilinear",
states = {
hover = {
atlas = "themes/button_hover.png",
scaleCorners = true, -- Can override per state
scalingAlgorithm = "nearest" -- Different algorithm for this state
}
}
}
```
## Tips ## Tips
1. **Start Simple**: Begin with one component (button) before creating a full theme 1. **Start Simple**: Begin with one component (button) before creating a full theme
@@ -355,6 +406,7 @@ Gui.new({
4. **State Variations**: For button states, change colors/brightness rather than structure 4. **State Variations**: For button states, change colors/brightness rather than structure
5. **Atlas Packing**: Use tools like TexturePacker or Aseprite to create efficient atlases 5. **Atlas Packing**: Use tools like TexturePacker or Aseprite to create efficient atlases
6. **Transparency**: Use semi-transparent backgroundColor to tint themed elements 6. **Transparency**: Use semi-transparent backgroundColor to tint themed elements
7. **Corner Scaling**: Enable for pixel art or responsive UIs; disable for pixel-perfect rendering
## Tools for Creating Atlases ## Tools for Creating Atlases

0
themes/metal.lua Normal file
View File

163
themes/space.lua
View File

@@ -1,8 +1,5 @@
-- Space Theme -- Space Theme
-- Panel is 882x687 with 110px border
-- All other components are 189x189 with 31px/127px regions
-- Define Color inline to avoid circular dependency
local Color = {} local Color = {}
Color.__index = Color Color.__index = Color
@@ -21,183 +18,43 @@ return {
components = { components = {
card = { card = {
atlas = "themes/space/card.png", atlas = "themes/space/card.png",
regions = { insets = { left = 66, top = 66, right = 66, bottom = 66 },
topLeft = { x = 0, y = 0, w = 100, h = 100 },
topCenter = { x = 100, y = 0, w = 205, h = 100 },
topRight = { x = 305, y = 0, w = 100, h = 100 },
middleLeft = { x = 0, y = 100, w = 100, h = 178 },
middleCenter = { x = 100, y = 100, w = 205, h = 178 },
middleRight = { x = 305, y = 100, w = 100, h = 178 },
bottomLeft = { x = 0, y = 278, w = 100, h = 100 },
bottomCenter = { x = 100, y = 278, w = 205, h = 100 },
bottomRight = { x = 305, y = 278, w = 100, h = 100 },
},
stretch = {
horizontal = { "topCenter", "middleCenter", "bottomCenter" },
vertical = { "middleLeft", "middleCenter", "middleRight" },
},
}, },
cardv2 = { cardv2 = {
atlas = "themes/space/card-v2.png", atlas = "themes/space/card-v2.png",
regions = { insets = { left = 66, top = 66, right = 66, bottom = 66 },
topLeft = { x = 0, y = 0, w = 100, h = 100 },
topCenter = { x = 100, y = 0, w = 205, h = 100 },
topRight = { x = 305, y = 0, w = 100, h = 100 },
middleLeft = { x = 0, y = 100, w = 100, h = 178 },
middleCenter = { x = 100, y = 100, w = 205, h = 178 },
middleRight = { x = 305, y = 100, w = 100, h = 178 },
bottomLeft = { x = 0, y = 278, w = 100, h = 100 },
bottomCenter = { x = 100, y = 278, w = 205, h = 100 },
bottomRight = { x = 305, y = 278, w = 100, h = 100 },
},
stretch = {
horizontal = { "topCenter", "middleCenter", "bottomCenter" },
vertical = { "middleLeft", "middleCenter", "middleRight" },
},
}, },
cardv3 = { cardv3 = {
atlas = "themes/space/card-v3.png", atlas = "themes/space/card-v3.png",
regions = { insets = { left = 286, top = 100, right = 286, bottom = 100 },
topLeft = { x = 0, y = 0, w = 286, h = 100 },
topCenter = { x = 286, y = 0, w = 74, h = 100 },
topRight = { x = 360, y = 0, w = 286, h = 100 },
middleLeft = { x = 0, y = 100, w = 286, h = 101 },
middleCenter = { x = 286, y = 100, w = 74, h = 101 },
middleRight = { x = 360, y = 100, w = 286, h = 101 },
bottomLeft = { x = 0, y = 201, w = 286, h = 100 },
bottomCenter = { x = 286, y = 201, w = 74, h = 100 },
bottomRight = { x = 360, y = 201, w = 286, h = 100 },
},
stretch = {
horizontal = { "topCenter", "middleCenter", "bottomCenter" },
vertical = { "middleLeft", "middleCenter", "middleRight" },
},
}, },
panel = { panel = {
atlas = "themes/space/panel.png", atlas = "themes/space/panel.png",
regions = { insets = { left = 38, top = 30, right = 22, bottom = 30 },
topLeft = { x = 0, y = 0, w = 38, h = 30 },
topCenter = { x = 38, y = 0, w = 53, h = 30 },
topRight = { x = 91, y = 0, w = 22, h = 30 },
middleLeft = { x = 0, y = 30, w = 38, h = 5 },
middleCenter = { x = 38, y = 30, w = 53, h = 5 },
middleRight = { x = 91, y = 30, w = 22, h = 5 },
bottomLeft = { x = 0, y = 35, w = 38, h = 30 },
bottomCenter = { x = 38, y = 35, w = 53, h = 30 },
bottomRight = { x = 91, y = 35, w = 22, h = 30 },
},
stretch = {
horizontal = { "topCenter", "middleCenter", "bottomCenter" },
vertical = { "middleLeft", "middleCenter", "middleRight" },
},
}, },
panelred = { panelred = {
atlas = "themes/space/panel-red.png", atlas = "themes/space/panel-red.png",
regions = { insets = { left = 38, top = 30, right = 22, bottom = 30 },
topLeft = { x = 0, y = 0, w = 38, h = 30 },
topCenter = { x = 38, y = 0, w = 53, h = 30 },
topRight = { x = 91, y = 0, w = 22, h = 30 },
middleLeft = { x = 0, y = 30, w = 38, h = 5 },
middleCenter = { x = 38, y = 30, w = 53, h = 5 },
middleRight = { x = 91, y = 30, w = 22, h = 5 },
bottomLeft = { x = 0, y = 35, w = 38, h = 30 },
bottomCenter = { x = 38, y = 35, w = 53, h = 30 },
bottomRight = { x = 91, y = 35, w = 22, h = 30 },
},
stretch = {
horizontal = { "topCenter", "middleCenter", "bottomCenter" },
vertical = { "middleLeft", "middleCenter", "middleRight" },
},
}, },
panelgreen = { panelgreen = {
atlas = "themes/space/panel-green.png", atlas = "themes/space/panel-green.png",
regions = { insets = { left = 38, top = 30, right = 22, bottom = 30 },
topLeft = { x = 0, y = 0, w = 38, h = 30 },
topCenter = { x = 38, y = 0, w = 53, h = 30 },
topRight = { x = 91, y = 0, w = 22, h = 30 },
middleLeft = { x = 0, y = 30, w = 38, h = 5 },
middleCenter = { x = 38, y = 30, w = 53, h = 5 },
middleRight = { x = 91, y = 30, w = 22, h = 5 },
bottomLeft = { x = 0, y = 35, w = 38, h = 30 },
bottomCenter = { x = 38, y = 35, w = 53, h = 30 },
bottomRight = { x = 91, y = 35, w = 22, h = 30 },
},
stretch = {
horizontal = { "topCenter", "middleCenter", "bottomCenter" },
vertical = { "middleLeft", "middleCenter", "middleRight" },
},
}, },
button = { button = {
atlas = "themes/space/button.png", atlas = "themes/space/button.png",
regions = { insets = { left = 14, top = 14, right = 14, bottom = 14 },
topLeft = { x = 0, y = 0, w = 14, h = 14 },
topCenter = { x = 14, y = 0, w = 86, h = 14 },
topRight = { x = 100, y = 0, w = 14, h = 14 },
middleLeft = { x = 0, y = 14, w = 14, h = 10 },
middleCenter = { x = 14, y = 14, w = 86, h = 10 },
middleRight = { x = 100, y = 14, w = 14, h = 10 },
bottomLeft = { x = 0, y = 24, w = 14, h = 14 },
bottomCenter = { x = 14, y = 24, w = 86, h = 14 },
bottomRight = { x = 100, y = 24, w = 14, h = 14 },
},
stretch = {
horizontal = { "topCenter", "middleCenter", "bottomCenter" },
vertical = { "middleLeft", "middleCenter", "middleRight" },
},
states = { states = {
hover = { hover = {
atlas = "themes/space/button-hover.png", atlas = "themes/space/button-hover.png",
regions = { insets = { left = 14, top = 14, right = 14, bottom = 14 },
topLeft = { x = 0, y = 0, w = 14, h = 14 },
topCenter = { x = 14, y = 0, w = 86, h = 14 },
topRight = { x = 100, y = 0, w = 14, h = 14 },
middleLeft = { x = 0, y = 14, w = 14, h = 10 },
middleCenter = { x = 14, y = 14, w = 86, h = 10 },
middleRight = { x = 100, y = 14, w = 14, h = 10 },
bottomLeft = { x = 0, y = 24, w = 14, h = 14 },
bottomCenter = { x = 14, y = 24, w = 86, h = 14 },
bottomRight = { x = 100, y = 24, w = 14, h = 14 },
},
stretch = {
horizontal = { "topCenter", "middleCenter", "bottomCenter" },
vertical = { "middleLeft", "middleCenter", "middleRight" },
},
}, },
pressed = { pressed = {
atlas = "themes/space/button-pressed.png", atlas = "themes/space/button-pressed.png",
regions = { insets = { left = 14, top = 14, right = 14, bottom = 14 },
topLeft = { x = 0, y = 0, w = 14, h = 14 },
topCenter = { x = 14, y = 0, w = 86, h = 14 },
topRight = { x = 100, y = 0, w = 14, h = 14 },
middleLeft = { x = 0, y = 14, w = 14, h = 10 },
middleCenter = { x = 14, y = 14, w = 86, h = 10 },
middleRight = { x = 100, y = 14, w = 14, h = 10 },
bottomLeft = { x = 0, y = 24, w = 14, h = 14 },
bottomCenter = { x = 14, y = 24, w = 86, h = 14 },
bottomRight = { x = 100, y = 24, w = 14, h = 14 },
},
stretch = {
horizontal = { "topCenter", "middleCenter", "bottomCenter" },
vertical = { "middleLeft", "middleCenter", "middleRight" },
},
}, },
disabled = { disabled = {
atlas = "themes/space/button-disabled.png", atlas = "themes/space/button-disabled.png",
regions = { insets = { left = 14, top = 14, right = 14, bottom = 14 },
topLeft = { x = 0, y = 0, w = 14, h = 14 },
topCenter = { x = 14, y = 0, w = 86, h = 14 },
topRight = { x = 100, y = 0, w = 14, h = 14 },
middleLeft = { x = 0, y = 14, w = 14, h = 10 },
middleCenter = { x = 14, y = 14, w = 86, h = 10 },
middleRight = { x = 100, y = 14, w = 14, h = 10 },
bottomLeft = { x = 0, y = 24, w = 14, h = 14 },
bottomCenter = { x = 14, y = 24, w = 86, h = 14 },
bottomRight = { x = 100, y = 24, w = 14, h = 14 },
},
stretch = {
horizontal = { "topCenter", "middleCenter", "bottomCenter" },
vertical = { "middleLeft", "middleCenter", "middleRight" },
},
}, },
}, },
}, },