redsquare.h

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#pragma once
 
#include "FastLED.h"
#include "fx/fx2d.h"
#include "fl/ptr.h"
 
namespace fl {
 
FASTLED_SMART_PTR(RedSquare);
 
class RedSquare : public Fx2d {
  public:
    struct Math {
        template <typename T> static T min(T a, T b) { return a < b ? a : b; }
    };
 
    RedSquare(XYMap xymap) : Fx2d(xymap) {}
 
    void draw(DrawContext context) override {
        uint16_t width = getWidth();
        uint16_t height = getHeight();
        uint16_t square_size = Math::min(width, height) / 2;
        uint16_t start_x = (width - square_size) / 2;
        uint16_t start_y = (height - square_size) / 2;
 
        for (uint16_t x = 0; x < width; x++) {
            for (uint16_t y = 0; y < height; y++) {
                uint16_t idx = mXyMap.mapToIndex(x, y);
                if (idx < mXyMap.getTotal()) {
                    if (x >= start_x && x < start_x + square_size &&
                        y >= start_y && y < start_y + square_size) {
                        context.leds[idx] = CRGB::Red;
                    } else {
                        context.leds[idx] = CRGB::Black;
                    }
                }
            }
        }
    }
 
    fl::Str fxName() const override { return "red_square"; }
};
 
}  // namespace fl