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<!DOCTYPE html>
<html>
<!--
csound.js canvas example
Copyright (C) 2017 V Lazzarini
-->
<head>
<title>WebAudio Csound </title>
<style type="text/css">
html,
body {
font-family: Monospace;
color: #bf94f7;
background-color: #000055;
}
H1 {
font-size: 36px;
}
#cnvs {
touch-action: none;
background-color: #bf94f7;
}
#messages {
width: 800px;
display: flex;
align-items: center;
justify-content: center;
font-family: Monospace;
}
</style>
<script type="text/javascript" src="js/csound.js"></script>
<script type="text/javascript">
function moduleDidLoad() {
csound.Play();
csound.CompileOrc(
"instr 1 \n" +
"kfr chnget \"freq\" \n" +
"kamp chnget \"amp\" \n" +
"kcf chnget \"cf\" \n" +
"ka linenr (800-kamp)/800,.01,0.1,0.01 \n" +
"a1 vco2 ka,440+kfr \n" +
"kcf port kcf,0.01 \n" +
"a2 moogvcf a1, kcf*(1+ka), 0.8 \n" +
"al,ar freeverb a2,a2, 0.3, 0.8 \n" +
"outs al,ar \n" +
"endin");
csound.SetChannel("cf", 1000);
}
function handleMessage(message) {
var cons = document.getElementById("messages");
cons.innerText = message;
}
function main() {
var cnvs = document.getElementById("cnvs");
var cons = document.getElementById("messages");
cons.innerText = "Loading Csound...";
// called by csound.js
var playing = false;
function cnvs_getCoordinates(e) {
if (playing) {
var ctx = cnvs.getContext("2d");
var rect = cnvs.getBoundingClientRect();
x = e.clientX - rect.left
y = e.clientY - rect.top
csound.SetChannel('amp', y);
csound.SetChannel('freq', x);
ctx.clearRect(0, 0, cnvs.width, cnvs.height);
ctx.fillStyle = "#000055";
ctx.fillRect(x, y, 15, 15);
}
}
var started = false;
function cnvs_play(e) {
if (started == false) {
CsoundObj.CSOUND_AUDIO_CONTEXT.resume();
started = true;
}
csound.Event("i1 0 -1");
csound.SetChannel('cf', 3000);
var ctx = cnvs.getContext("2d");
var rect = cnvs.getBoundingClientRect();
x = e.clientX - rect.left
y = e.clientY - rect.top
csound.SetChannel('amp', y);
csound.SetChannel('freq', x);
ctx.fillStyle = "#000055";
ctx.fillRect(x, y, 15, 15);
playing = true;
}
function cnvs_stop(e) {
csound.Event("i-1 0 -1");
csound.SetChannel('cf', 1000);
var ctx = cnvs.getContext("2d");
ctx.clearRect(0, 0, cnvs.width, cnvs.height);
playing = false;
}
function cnvs_out() {}
function cnvs_getTCoordinates(e) {
e.preventDefault();
if (playing) {
var ctx = cnvs.getContext("2d");
var rect = cnvs.getBoundingClientRect();
touches = e.touches;
t = touches[0];
x = t.clientX - rect.left
y = t.clientY - rect.top
csound.SetChannel('amp', y);
csound.SetChannel('freq', x);
ctx.clearRect(0, 0, cnvs.width, cnvs.height);
ctx.fillStyle = "#000055";
ctx.fillRect(x, y, 50, 50);
}
}
var started = false;
function cnvs_tplay(e) {
e.preventDefault();
if (started == false) {
CsoundObj.CSOUND_AUDIO_CONTEXT.resume();
started = true;
}
csound.Event("i1 0 -1");
csound.SetChannel('cf', 3000);
var ctx = cnvs.getContext("2d");
var rect = cnvs.getBoundingClientRect();
touches = e.touches;
t = touches[0];
x = t.clientX - rect.left
y = t.clientY - rect.top
csound.SetChannel('amp', y);
csound.SetChannel('freq', x);
ctx.fillStyle = "#000055";
ctx.fillRect(x, y, 50, 50);
playing = true;
}
function cnvs_tstop(e) {
e.preventDefault();
csound.Event("i-1 0 -1");
csound.SetChannel('cf', 1000);
var ctx = cnvs.getContext("2d");
ctx.clearRect(0, 0, cnvs.width, cnvs.height);
playing = false;
}
cnvs.addEventListener("touchstart", cnvs_tplay, false);
cnvs.addEventListener("touchmove", cnvs_getTCoordinates, false);
cnvs.addEventListener("touchend", cnvs_tstop, false);
cnvs.addEventListener("mousedown", cnvs_play, false);
cnvs.addEventListener("mouseup", cnvs_stop, false);
cnvs.addEventListener("mousemove", cnvs_getCoordinates, false);
}
window.oncontextmenu = function(event) {
event.preventDefault();
event.stopPropagation();
return false;
};
</script>
</head>
<body onload="main()">
<H1 id='tit'>Canvas Synth</H1>
<p>
<div id="messages"> </div>
</p>
<p>
<canvas class="cnvs " id="cnvs" width=800 height=800></canvas>
</p>
</body>
</html>
|
