Description

The GR32_ColorGradients unit implements a flexible color gradient framework in Graphics32. It provides multi-stop color gradient definitions, high-performance lookup table generation, spatial 2D gradient sampling, and polygon gradient filler renderers.

Key Capabilities

1. Color Stop & Lookup Table Management:

   • TColor32Gradient: Manages an ordered list of color stops with position offsets ($0.0\dots 1.0$), alpha blending support, and event notifications.
   • TColor32LookupTable: Pre-calculates 256 or 1024-entry ARGB color lookup tables for fast scanline rendering.

2. Analytical & Center-Based Gradient Samplers:

   • Linear gradients (TLinearGradientSampler, TXGradientSampler).
   • Radial and focal-offset radial gradients (TRadialGradientSampler, TRadialExGradientSampler).
   • Angular, conic, and sweep gradients (TConicGradientSampler, TSweepGradientSampler).
   • Geometric shapes: Diamond (TDiamondGradientSampler), XY/XY-Sqrt (TXYGradientSampler, TXYSqrtGradientSampler).

3. Sparse-Point & Polygon Gradient Fillers:

   • TBarycentricGradientSampler / TBarycentricGradientPolygonFiller: 3-point planar triangular interpolation.
   • TBilinearGradientSampler: 4-point quadrilateral bilinear interpolation.
   • TInvertedDistanceWeightingSampler: Shepard's method for arbitrary scatter point sets.
   • TVoronoiSampler: Voronoi diagram cell partitioning using Euclidean or Manhattan distance metrics.
   • TGourandShadedDelaunayTrianglesSampler / TGourandShadedDelaunayTrianglesPolygonFiller: Delaunay triangulation mesh shading.
   • Polygon fillers for high-speed scanline rasterization with anti-aliasing (TLinearGradientPolygonFiller, TRadialGradientPolygonFiller, TSVGRadialGradientPolygonFiller).