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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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57
repl/src/pianoroll.mjs
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@ -1,41 +1,30 @@
import { draw, queryEvents, getDrawContext } from './draw.mjs';
import { Pattern } from '../../strudel.mjs';
import * as Tone from 'tone';
Pattern.prototype.pianoroll = function () {
// draw stuff here with p.query
const ctx = getDrawContext();
Pattern.prototype.pianoroll = function ({
timeframe = 10,
inactive = '#88ABF8',
active = '#FFCA28',
background = '#2A3236',
maxMidi = 90,
minMidi = 0,
} = {}) {
const w = window.innerWidth;
const h = window.innerHeight;
const s = 10; // 10s in viewport
const maxMidi = 90;
const height = h / maxMidi;
let events;
queryEvents(this, (_events) => (events = _events), s);
const clear = () => ctx.clearRect(0, 0, w, h);
const drawEvents = (events) => {
events.forEach((event) => {
const t = Tone.getTransport().seconds;
const isActive = event.whole.begin <= t && event.whole.end >= t;
ctx.fillStyle = isActive ? '#FFCA28' : '#88ABF8';
const x = Math.round((event.whole.begin / s) * w);
const width = Math.round(((event.whole.end - event.whole.begin) / s) * w);
const y = Math.round(h - (Number(event.value) / maxMidi) * h);
const offset = (t / s) * w;
const margin = 0;
// console.log(x, y, width, height)
ctx.fillRect(x - offset + margin, y, width, height);
});
};
draw((t) => {
clear();
ctx.fillStyle = '#2A3236';
const midiRange = maxMidi - minMidi + 1;
const height = h / midiRange;
this.draw((ctx, events, t) => {
ctx.fillStyle = background;
ctx.fillRect(0, 0, w, h);
drawEvents(events);
});
events.forEach((event) => {
const isActive = event.whole.begin <= t && event.whole.end >= t;
ctx.fillStyle = isActive ? active : inactive;
const x = Math.round((event.whole.begin / timeframe) * w);
const width = Math.round(((event.whole.end - event.whole.begin) / timeframe) * w);
const y = Math.round(h - ((Number(event.value) - minMidi) / midiRange) * h);
const offset = (t / timeframe) * w;
const margin = 0;
ctx.fillRect(x - offset + margin + 1, y + 1, width - 2, height - 2);
});
}, timeframe);
return this;
};