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nocandy.html
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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>The Big Wheel</title>
<script type="text/javascript">
// https://stackoverflow.com/a/29190009
// https://stackoverflow.com/a/5400970
// https://stackoverflow.com/a/12646864
// https://stackoverflow.com/a/35626468
var words = ["Buzz Like a Bee", "Stick Your Tongue Out", "New First Letter",
"Stand On One Foot", "Follow the Leader", "Teachers vs Kids",
"Every Other Word", "Opera", "Class Act",
"Staccato", "Soft", "Fast"];
var colors = ["Red", "YellowGreen", "MediumPurple",
"Orange", "CornFlowerBlue", "Yellow",
"Red", "YellowGreen", "MediumPurple",
"Orange", "CornFlowerBlue", "Yellow"];
var rotation = 0;
var delta = 0;
var radius = 240;
/**
* Randomize array element order in-place.
* Using Durstenfeld shuffle algorithm.
*/
function shuffleArray(array) {
for (var i = array.length - 1; i > 0; i--) {
var j = Math.floor(Math.random() * (i + 1));
var temp = array[i];
array[i] = array[j];
array[j] = temp;
}
}
function init() {
shuffleArray(words);
canvas = document.getElementById("testCanvas");
canvas.addEventListener('click', () => {
play();
delta = 0.18 + Math.random() * 0.04;
requestAnimationFrame(drawWheel);
});
context = canvas.getContext("2d");
drawWheel(false);
drawTriangle();
}
function drawSector(text, angle, subtend) {
context.save();
context.rotate(angle);
context.beginPath();
context.moveTo(0, 0);
context.arc(0, 0, radius, -subtend/2, subtend/2, false);
context.fillStyle = colors[i];
context.fill();
context.textAlign = "center";
context.fillStyle = "Black";
context.font = context.font.replace(/\d+px/, "16px");
context.fillText(text, radius * 0.6, 6);
context.restore();
}
function drawWheel(animate) {
// reset transforms before clearing
context.save();
// translate and rotate an absolute rotation value
context.translate(300, 300);
context.rotate(rotation);
subtend = 2 * Math.PI / words.length;
// draw arcs
for (i = 0; i < words.length; i++) {
drawSector(words[i], i*subtend, subtend);
}
context.beginPath();
context.arc(0, 0, radius, 0, Math.PI * 2, false);
context.lineWidth = 8;
context.stroke();
context.beginPath();
context.arc(0, 0, radius / 10.0, 0, Math.PI * 2, false);
context.lineWidth = 8;
context.fillStyle = "Gray";
context.fill();
context.restore();
// update rotation value and request new frame
if (animate) {
rotation += delta;
delta -= 0.001
requestAnimationFrame(()=>drawWheel(delta > 0))
}
}
function drawTriangle() {
context.beginPath();
context.moveTo(540, 300);
context.lineTo(595, 330);
context.lineTo(595, 270);
context.lineTo(540, 300);
context.fillStyle = "gray";
context.lineWidth = 5;
context.fill();
context.stroke();
}
function play(){
var audio = document.getElementById("audio");
audio.play();
}
</script>
</head>
<body onload="init()">
<canvas id="testCanvas" width="600" height="600">
Canvas not supported
</canvas>
<audio id="audio" src="sound.mp3" ></audio>
</body>
</html>