Method drawDot

src/fl/fx/2d/flowfield.cpp.hpp:163–187

}

void FlowFieldFloat::drawDot(float cx, float cy, float diam,
                                  u8 cr, u8 cg, u8 cb) {
    int w = (int)getWidth();
    int h = (int)getHeight();
    float rad = diam * 0.5f;
    int x0 = fl::max(0, (int)floorf(cx - rad - 1.0f));
    int x1 = fl::min(w - 1, (int)ceilf(cx + rad + 1.0f));
    int y0 = fl::max(0, (int)floorf(cy - rad - 1.0f));
    int y1 = fl::min(h - 1, (int)ceilf(cy + rad + 1.0f));
    for (int y = y0; y <= y1; y++) {
        for (int x = x0; x <= x1; x++) {
            float dx = (x + 0.5f) - cx;
            float dy = (y + 0.5f) - cy;
            float dist = sqrtf(dx * dx + dy * dy);
            float cov = clampf(rad + 0.5f - dist, 0.0f, 1.0f);
            if (cov <= 0.0f)
                continue;
            float inv = 1.0f - cov;
            int i = idx(y, x);
            mR[i] = mR[i] * inv + cr * cov;
            mG[i] = mG[i] * inv + cg * cov;
            mB[i] = mB[i] * inv + cb * cov;
        }
    }
}

void FlowFieldFloat::drawAALine(float x0, float y0, float x1, float y1,
                                   float t, float colorShift) {