sampleBilinear()

CRGB fl::sampleBilinear	(	const CRGB *	grid,
		const XYMap &	xyMap,
		float	x,
		float	y )

Bilinear interpolation sample from a 2D CRGB grid.

Definition at line 18 of file sample.cpp.hpp.

                                                                                         {
    int x0 = static_cast<int>(x);
    int y0 = static_cast<int>(y);
    int x1 = min(x0 + 1, static_cast<int>(xyMap.getWidth()) - 1);
    int y1 = min(y0 + 1, static_cast<int>(xyMap.getHeight()) - 1);
 
    // Clamp x0 and y0 to valid range
    x0 = max(0, min(x0, static_cast<int>(xyMap.getWidth()) - 1));
    y0 = max(0, min(y0, static_cast<int>(xyMap.getHeight()) - 1));
 
    float fx = x - x0;
    float fy = y - y0;
 
    // Get four neighboring pixels
    CRGB c00 = grid[xyMap.mapToIndex(x0, y0)];
    CRGB c10 = grid[xyMap.mapToIndex(x1, y0)];
    CRGB c01 = grid[xyMap.mapToIndex(x0, y1)];
    CRGB c11 = grid[xyMap.mapToIndex(x1, y1)];
 
    // Interpolate
    CRGB c0 = CRGB::blend(c00, c10, static_cast<u8>(fx * 255));
    CRGB c1 = CRGB::blend(c01, c11, static_cast<u8>(fx * 255));
    return CRGB::blend(c0, c1, static_cast<u8>(fy * 255));
}

References fl::CRGB::blend(), FL_NO_EXCEPT, max(), min(), x, xyMap, and y.

Referenced by sample().

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