Method Circle

src/fl/math/screenmap.cpp.hpp:63–91

}

ScreenMap ScreenMap::Circle(int numLeds, float cm_between_leds,
                            float cm_led_diameter, float completion) {
    ScreenMap screenMap(numLeds);

    // radius from LED spacing
    float circumference = numLeds * cm_between_leds;
    float radius = circumference / (2 * FL_PI);

    // how big an arc we light vs leave dark
    float totalAngle = completion * 2 * FL_PI;
    float gapAngle = 2 * FL_PI - totalAngle;

    // shift so the dark gap is centered at the bottom (–π/2)
    float startAngle = -FL_PI / 2 + gapAngle / 2.0f;

    // if partial, land last LED exactly at startAngle+totalAngle
    float divisor =
        (completion < 1.0f && numLeds > 1) ? (numLeds - 1) : numLeds;

    for (int i = 0; i < numLeds; ++i) {
        float angle = startAngle + (i * totalAngle) / divisor;
        float x = radius * cos(angle) * 2;
        float y = radius * sin(angle) * 2;
        screenMap[i] = {x, y};
    }

    screenMap.setDiameter(cm_led_diameter);
    return screenMap;
}

ScreenMap ScreenMap::DefaultStrip(int numLeds, float cm_between_leds,
                                  float cm_led_diameter, float completion) {