Color picker library #305
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Color picker library #305
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This commit introduces a full-featured color manipulation and selection library for ChrysaLisp, including: Library Components (lib/colors/): - colors.inc: Core color library with 140+ web colors, HSV<->RGB conversion, ARGB utilities, hex parsing/formatting, color name lookup, and color manipulation functions (lighten, darken, saturate, desaturate, hue rotation, blending) - picker.inc: ColorPicker GUI widget class with HSV sliders, RGB sliders, live preview, hex input/output, and web color palette (36 common colors) - test.lisp: Comprehensive test suite for all color functions - README.md: Complete documentation with examples and usage guide Demo Application (apps/colorpicker/): - Full-featured demo showcasing all color picker features - Color information display (Hex, RGB, HSV values) - Clipboard integration for copying color values - Interactive color manipulation (lighten/darken/saturate/desaturate) - Color name lookup and sample text/background previews Features: - HSV/RGB color space conversion with proper floating-point precision - 140+ named web colors (HTML/CSS standard) - Hex color parsing (#RGB and #RRGGBB formats) - Color manipulation (lighten, darken, saturation, hue rotation, blending) - Closest color name matching with configurable tolerance - Interactive GUI widget with multiple input methods Technical Details: - Follows ChrysaLisp coding conventions (proper naming, no forward refs) - Uses efficient O(1) web color lookups via Fmap - Proper use of defq/setq, bind patterns, and iteration over recursion - Widget inherits from Flow with proper action event handling - Prevents feedback loops in UI updates with :updating flag
The hex input field and V slider were using the same event ID (base+2), causing the hex input to never receive events. Changes: - Moved hex input to event ID base+6 - Moved palette buttons to event ID base+7+ - Updated action method to handle new event IDs correctly This ensures all widget controls have unique event IDs and function properly.
Edge Case Tests (lib/colors/test_edges.lisp): - Black and white boundary testing - Grayscale values (S=0) across all hues - Hue boundary tests (0° and 360° wrapping) - Saturation extremes (0-100%) - Value extremes (0-100%) - Hex parsing edge cases (short form, case, invalid input) - Color blending ratios (0.0, 0.5, 1.0) - Color name lookup with tolerance - ARGB packing with overflow values - Round-trip precision testing with random colors - 50+ individual test cases covering all edge conditions Integration Examples (examples/colors/): Example 1 - Basic Usage: - Working with web colors - RGB/HSV conversion - Hex parsing and formatting - Color manipulation functions - Color blending - Name lookup Example 2 - Color Theming: - Monochromatic theme generation - Complementary color schemes - Triadic color harmony - Analogous colors - Split-complementary themes - Complete application theme creation - Demonstrates color theory in practice Example 3 - Widget Integration: - Full GUI app with ColorPicker - Real-time color preview - Apply colors to UI elements - Event handling patterns - Integration best practices Documentation: - Comprehensive examples README - Use case patterns - Integration patterns - Advanced topics (gradients, palettes) - Tips and best practices All examples are fully functional and demonstrate real-world usage.
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