User:Lbattich/Sound Prototypes
Circle Scanner
Scans the canvas and produces sounds according to the image data form the canvas element (forefox only)
It has a svg line hovering on top to mark the scan (to keep the canvas image data intact while visualizing the scan)
<!DOCTYPE html>
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| |_) | (_| | |_| |_| | (__| | | |
|_.__/ \__,_|\__|\__|_|\___|_| |_|
CRICLE SCANNER
by LUCAS BATTICH, 2014
-->
<html>
<head>
<meta content="text/html; charset=utf-8" http-equiv="content-type">
<title>Circle Scanner - by lucas battich</title>
</head>
<body>
<button onclick="start()">scan</button>
<button onclick="circle()">draw a circle</button>
<button onclick="white()">clear up</button>
<button onclick="silence()">stop</button>
<br>
<br>
<svg id="line" height="300" style="position: absolute">
<line id= "bar" x1="0" y1="0" x2="0" y2="300" style="stroke:rgba(255,0,0,0.7);stroke-width:1" />
</svg>
<canvas id="myCanvas" height="300"></canvas>
<script>
var context = new AudioContext();
var osc1 = context.createOscillator();
var osc2 = context.createOscillator();
var osc3 = context.createOscillator();
var osc4 = context.createOscillator();
var osc5 = context.createOscillator();
var gain1 = context.createGain(); // Create gain node 1
var gain2 = context.createGain();
var gain3 = context.createGain();
var gain4 = context.createGain();
var gain5 = context.createGain();
var tid;
var x = 0;
// Connect oscillators to gains, and gain to context destination (speakers)
osc1.connect(gain1);
osc2.connect(gain2);
osc3.connect(gain3);
osc4.connect(gain4);
osc5.connect(gain5);
gain1.connect(context.destination);
gain2.connect(context.destination);
gain3.connect(context.destination);
gain4.connect(context.destination);
gain5.connect(context.destination);
osc1.frequency.value = 500;
osc2.frequency.value = 400;
osc3.frequency.value = 300;
osc4.frequency.value = 200;
osc5.frequency.value = 100;
gain1.gain.value = 0;
gain2.gain.value = 0;
gain3.gain.value = 0;
gain4.gain.value = 0;
gain5.gain.value = 0;
osc1.start(0);
osc2.start(0);
osc3.start(0);
osc4.start(0);
osc5.start(0);
var blackloud = true;
var canvas = document.getElementById('myCanvas');
var ctx = canvas.getContext('2d');
canvas.width = window.innerWidth-30;
document.getElementById("line").setAttribute("width", canvas.width);
white();
circle();
function start(){
if (tid){
clearTimeout(tid);
}
x = 0;
change();
}
function scan() {
var data = ctx.getImageData(x,0,1,1).data; // (x, y, width, height)
var pixel = data[0] + data[1] + data[2];
var scale = pixel / (255*3); //scale from 0=black=quiet and 1=white=loud
gain1.gain.value = blackloud ? 1-scale : scale;
var data = ctx.getImageData(x,75,1,1).data; // (x, y, width, height)
var pixel = data[0] + data[1] + data[2];
var scale = pixel / (255*3); //0=black and 1=white
gain2.gain.value = blackloud ? 1-scale : scale;
var data = ctx.getImageData(x,150,1,1).data; // (x, y, width, height)
var pixel = data[0] + data[1] + data[2];
var scale = pixel / (255*3); //0=black and 1=white
gain3.gain.value = blackloud ? 1-scale : scale;
var data = ctx.getImageData(x,225,1,1).data; // (x, y, width, height)
var pixel = data[0] + data[1] + data[2];
var scale = pixel / (255*3); //0=black and 1=white
gain4.gain.value = blackloud ? 1-scale : scale;
var data = ctx.getImageData(x,299,1,1).data; // (x, y, width, height)
var pixel = data[0] + data[1] + data[2];
var scale = pixel / (255*3); //0=black and 1=white
gain5.gain.value = blackloud ? 1-scale : scale;
var bar = document.getElementById("bar");
bar.setAttribute("x1", x);
bar.setAttribute("x2", x);
}
function white() {
ctx.fillStyle="white"; //first colour
ctx.fillRect(0,0,canvas.width,canvas.height);
ctx.fill();
}
function change() {
x = x+1;
scan();
if (x < (canvas.width-1)) {
tid = setTimeout(change,7);
}
else {
x=0;
tid = setTimeout(change,7);
}
}
function silence() {
gain1.gain.value = 0;
gain2.gain.value = 0;
gain3.gain.value = 0;
gain4.gain.value = 0;
gain5.gain.value = 0;
clearTimeout(tid);
}
function circle()
{
var xc,yc,radio;
yc=Math.floor((canvas.height+1)*Math.random());
xc=Math.floor((canvas.width+1)*Math.random());
radio=Math.floor((200)*Math.random());
ctx.beginPath();
ctx.arc(xc,yc,radio,0,2*Math.PI);
var grd=ctx.createLinearGradient(xc-radio,yc-radio,xc+radio,yc+radio);
grd.addColorStop(0,colourme());
grd.addColorStop(1,colourme());
ctx.strokeStyle=grd;
ctx.lineWidth=Math.floor((100)*Math.random());
ctx.stroke();
}
function colourme()
{
var a = Math.floor(256*Math.random());
var b = Math.floor(256*Math.random());
var c = Math.floor(256*Math.random());
var colour = "rgb("+a+","+b+","+c+")";
return colour;
}
</script>
</body>
</html>
Audio Test - Play a random composition using the Oscillator wave generator on the Web Audio API
Works only on Firefox so far...
<!DOCTYPE html>
<html>
<head>
<meta content="text/html; charset=utf-8" http-equiv="content-type">
<title>Audio test - Play a random composition</title>
</head>
<body>
<p>Choose frequency between 80Hz and 880Hz: <input type="text" size="7" id="fr" value=""> <label for="fr">Hz</label></p>
<p>Choose gain between 0.2 and 1.2: <input type="text" size="7" id="gn" value=""> <label for="gn">Gain</label></p>
<p>Choose duration between 1/50sec and 1sec: <input type="text" size="7" id="tm" value=""> <label for="tm">Seconds</label></p>
<p>Choose waveform: <input type="text" size="7" id="vw" value=""> <label for="tm">wave</label></p>
<br>
<button onclick="play()">play</button>
<button onclick="silence()">stop</button>
<script>
var context = new AudioContext();
var tone = context.createOscillator();
var gainNode1 = context.createGain(); // Create gain node 1
var on=0;
tone.type = 0; // sine wave
tone.frequency.value = 0;
tone.connect(gainNode1); // Connect sound source tone to gain node 1
gainNode1.connect(context.destination);
gainNode1.gain.value = 0;
tone.start(0);
function play(){
if (on==0){
on=1;
change();
}
}
function change() {
if (on==1){
// random gain between 0.2 and 1.2
var gain = 0.2+Math.random();
gainNode1.gain.value = gain;
document.getElementById("gn").value = gain;
// random frequency between 80 and 880
var freq = 80 + Math.floor(801*Math.random());
tone.frequency.value = freq;
document.getElementById("fr").value = freq;
//random wave shape
var wave = Math.floor(4*Math.random());
tone.type = wave;
if (wave==0){document.getElementById("vw").value="Sine";}
else if (wave==1){document.getElementById("vw").value="Square";}
else if (wave==2){document.getElementById("vw").value="Sawtooth";}
else if (wave==3){document.getElementById("vw").value="Triangle";}
// random duration of note - 1/50sec to 1sec
var time = 20 + Math.floor(901*Math.random());
document.getElementById("tm").value = time/1000;
setTimeout(function(){change()},time);
}
}
function silence() {
tone.frequency.value = 0;
gainNode1.gain.value = 0;
on=0;
}
</script>
</body>
</html>