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45 lines
2.1 KiB
JavaScript
45 lines
2.1 KiB
JavaScript
/*
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pianoroll.mjs - <short description TODO>
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Copyright (C) 2022 Strudel contributors - see <https://github.com/tidalcycles/strudel/blob/main/packages/tone/pianoroll.mjs>
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This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details. You should have received a copy of the GNU Affero General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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import { Pattern } from '@strudel.cycles/core';
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Pattern.prototype.pianoroll = function ({
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timeframe = 10,
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inactive = '#C9E597',
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active = '#FFCA28',
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background = '#2A3236',
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maxMidi = 90,
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minMidi = 0,
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} = {}) {
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const w = window.innerWidth;
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const h = window.innerHeight;
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const midiRange = maxMidi - minMidi + 1;
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const height = h / midiRange;
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this.draw(
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(ctx, events, t) => {
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ctx.fillStyle = background;
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ctx.clearRect(0, 0, w, h);
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ctx.fillRect(0, 0, w, h);
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events.forEach((event) => {
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const isActive = event.whole.begin <= t && event.whole.end >= t;
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ctx.fillStyle = event.context?.color || inactive;
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ctx.strokeStyle = event.context?.color || active;
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ctx.globalAlpha = event.context.velocity ?? 1;
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const x = Math.round((event.whole.begin / timeframe) * w);
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const width = Math.round(((event.whole.end - event.whole.begin) / timeframe) * w);
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const y = Math.round(h - ((Number(event.value) - minMidi) / midiRange) * h);
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const offset = (t / timeframe) * w;
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const margin = 0;
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const coords = [x - offset + margin + 1, y + 1, width - 2, height - 2];
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isActive ? ctx.strokeRect(...coords) : ctx.fillRect(...coords);
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});
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},
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timeframe,
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2, // lookaheadCycles
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);
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return this;
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};
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