hacklab/strudel
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optimize draw logic

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This commit is contained in:
Felix Roos 2022-03-12 20:30:07 +01:00
parent abb698281c
commit 2295ba7554
3 changed files with 38 additions and 55 deletions
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35
repl/src/draw.mjs
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@ -1,4 +1,5 @@
import * as Tone from 'tone';
import { Pattern } from '../../strudel.mjs';
export const getDrawContext = (id = 'test-canvas') => {
let canvas = document.querySelector('#' + id);
@ -13,35 +14,27 @@ export const getDrawContext = (id = 'test-canvas') => {
return canvas.getContext('2d');
};
export const draw = (callback) => {
Pattern.prototype.draw = function (callback, duration) {
if (window.strudelAnimation) {
cancelAnimationFrame(window.strudelAnimation);
}
const animate = (t) => {
callback(t);
const ctx = getDrawContext();
let cycle, events;
const animate = (time) => {
const t = Tone.getTransport().seconds;
const currentCycle = Math.floor(t / duration);
if (cycle !== currentCycle) {
cycle = currentCycle;
const begin = currentCycle * duration;
const end = (currentCycle + 2) * duration;
events = this.add(0).query(new State(new TimeSpan(begin, end)));
}
callback(ctx, events, t, time);
window.strudelAnimation = requestAnimationFrame(animate);
};
requestAnimationFrame(animate);
};
export const queryEvents = (pattern, callback, seconds) => {
const queryEvents = () => {
const t = Tone.getTransport().seconds;
const begin = Math.floor(t / seconds) * seconds;
const end = begin + seconds * 4;
// console.log('query', t, begin, end);
const events = pattern.add(0).query(new State(new TimeSpan(begin, end)));
callback(events);
};
queryEvents();
if (window.strudelScheduler) {
clearInterval(window.strudelScheduler);
}
window.strudelScheduler = setInterval(() => {
queryEvents();
}, seconds * 1.5 * 1000);
};
export const cleanup = () => {
const ctx = getDrawContext();
ctx.clearRect(0, 0, window.innerWidth, window.innerHeight);