Xiaohan-Tian
24 lines
716 B
TypeScript
24 lines
716 B
TypeScript
// Purple (vel=0) -> green (vel=64) -> red (vel=127), matching the piano roll note colors.
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export function velocityToColor(v: number, alpha = 1): string {
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const clampedVelocity = Math.max(0, Math.min(127, v));
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const lerp = (a: number, b: number, t: number) => Math.round(a + (b - a) * t);
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let r: number;
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let g: number;
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let b: number;
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if (clampedVelocity <= 64) {
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const t = clampedVelocity / 64;
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r = lerp(123, 90, t);
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g = lerp(95, 176, t);
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b = lerp(160, 106, t);
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} else {
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const t = (clampedVelocity - 64) / 63;
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r = lerp(90, 255, t);
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g = lerp(176, 85, t);
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b = lerp(106, 85, t);
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}
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return alpha === 1 ? `rgb(${r}, ${g}, ${b})` : `rgba(${r}, ${g}, ${b}, ${alpha})`;
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}
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