Function makeRingScreenMap

examples/AnimartrixRing/ring_screenmap.cpp:10–20

#endif

fl::ScreenMap makeRingScreenMap(int numLeds, int gridWidth, int gridHeight,
                                float diameter) {
    return fl::ScreenMap(numLeds, diameter, [=](int index, fl::vec2f &pt_out) {
        float centerX = gridWidth / 2.0f;
        float centerY = gridHeight / 2.0f;
        float radius = fl::min(gridWidth, gridHeight) / 2.0f - 1;
        float angle = (TWO_PI * index) / numLeds;
        pt_out.x = centerX + fl::cos(angle) * radius;
        pt_out.y = centerY + fl::sin(angle) * radius;
    });
}