Method draw

examples/XYPath/src/wave.h:15–15

    fl::WaveFxPtr wave_fx_high;
    fl::Blend2dPtr blend_stack;
    void draw(fl::Fx::DrawContext context) { blend_stack->draw(context); }
    void addf(size_t x, size_t y, float value) {
        wave_fx_low->addf(x, y, value);
        wave_fx_high->addf(x, y, value);