Method draw

tests/fl/fx/2d/blend.hpp:57–61

    fl::string fxName() const override { return "TestFx2D"; }

    void draw(fl::Fx::DrawContext context) override {
        for (uint16_t i = 0; i < mXyMap.getTotal(); i++) {
            context.leds[i] = mLeds[i];
        }
    }

    fl::unique_ptr<CRGB[]> mLeds;
};