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onFrame function

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This commit is contained in:
Felix Roos 2024-03-01 16:46:34 +01:00
parent 4f94de86db
commit 62d8955da9
1 changed files with 19 additions and 0 deletions
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19
packages/canvas/draw.mjs
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@ -61,6 +61,25 @@ Pattern.prototype.draw = function (callback, { from, to, onQuery } = {}) {
return this; return this;
}; };
// this is a more generic helper to get a rendering callback for the currently active haps
// TODO: this misses events that are prolonged with clip or duration (would need state)
Pattern.prototype.onFrame = function (fn) {
if (typeof window === 'undefined') {
return this;
}
if (window.strudelAnimation) {
cancelAnimationFrame(window.strudelAnimation);
}
const animate = () => {
const t = getTime();
const haps = this.queryArc(t, t);
fn(haps, t, this);
window.strudelAnimation = requestAnimationFrame(animate);
};
requestAnimationFrame(animate);
return this;
};
export const cleanupDraw = (clearScreen = true) => { export const cleanupDraw = (clearScreen = true) => {
const ctx = getDrawContext(); const ctx = getDrawContext();
clearScreen && ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.width); clearScreen && ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.width);