Function gradient_get

StereoKitC/color.cpp:190–205

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color128 gradient_get(gradient_t gradient, float at) {
	if (gradient->count == 0)
		return { 1,0,0,1 };
	if (at < gradient->keys[0].position)
		return gradient->keys[0].color;
	if (at >= gradient->keys[gradient->count - 1].position)
		return gradient->keys[gradient->count - 1].color;

	for (int32_t i = 1; i < gradient->count; i++) {
		if (gradient->keys[i].position >= at) {
			float pct = (at - gradient->keys[i-1].position) / (gradient->keys[i].position - gradient->keys[i-1].position);
			return color_lerp(gradient->keys[i-1].color, gradient->keys[i].color, pct);
		}
	}
	return { 1,0,0,1 };
}

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