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simple-sample.html
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simple-sample.html
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<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Touchy Web Applications - [$$$Title$$$]</title>
<link href="preso.css" rel="stylesheet" />
<script src="preso.js" type="text/javascript"></script>
</head>
<body>
<h1>A Simple Sample</h1>
<p>Touch me...</p>
<canvas id="theCanvas" height="300" width="960" style="-ms-touch-action: none;">
</canvas>
<p>If you haven't seen Canvas in action...</p>
<pre>
var canvas, context;
function load() {
canvas = document.getElementById('theCanvas');
context = canvas.getContext('2d');
}
window.addEventListener('load', load);
function draw(x, y) {
context.fillStyle = '#00F';
var radius = 6;
var startRadian = 0;
var endRadian = Math.PI * 2;
context.beginPath();
context.arc(x, y, radius, startRadian, endRadian);
context.fill();
}</pre>
<p>Our position function...</p>
<pre>
function getPositionFromTarget(evt, target) {
return {
y: evt.pageY - target.offsetTop,
x: evt.pageX - target.offsetLeft
};
}</pre>
<p>Mouse</p>
<pre>
function load() {
//...
canvas.addEventListener('click', function (evt) {
var position = getPositionFromTarget(evt, evt.target);
draw(position.x, position.y);
});
}</pre>
<p>Touch Events</p>
<pre>
function load() {
//...
canvas.addEventListener('touchstart', function (evt) {
evt.preventDefault();
var i, position;
for (i = 0; i < evt.touches.length; i++) {
position = getPositionFromTarget(evt.touches[i], evt.touches[i].target);
draw(position.x, position.y);
}
});
}</pre>
<p>Pointer events</p>
<pre>
function load() {
//...
if (window.navigator.msPointerEnabled) {
canvas.addEventListener('MSPointerDown', function (evt) {
var position = getPositionFromTarget(evt, evt.target);
draw(position.x, position.y);
});
}
else {
//mouse events go here
}
}</pre>
<div class="nav">
<div class="prev"><a href="browser-event-behavior.html"><</a></div>
<div class="next"><a href="signature.html">></a></div>
</div>
<script>
var canvas, context;
function load() {
canvas = document.getElementById('theCanvas');
context = canvas.getContext('2d');
canvas.addEventListener('touchstart', function (evt) {
evt.preventDefault();
var i, position;
for (i = 0; i < evt.touches.length; i++) {
position = getPositionFromTarget(evt.touches[i], evt.touches[i].target);
draw(position.x, position.y);
}
});
if (window.navigator.msPointerEnabled) {
canvas.addEventListener('MSPointerDown', function (evt) {
var position = getPositionFromTarget(evt, evt.target);
draw(position.x, position.y);
});
}
else {
canvas.addEventListener('click', function (evt) {
var position = getPositionFromTarget(evt, evt.target);
draw(position.x, position.y);
});
}
}
window.addEventListener('load', load);
function draw(x, y) {
context.fillStyle = '#00F';
var radius = 6;
var startRadian = 0;
var endRadian = Math.PI * 2;
context.beginPath();
context.arc(x, y, radius, startRadian, endRadian);
context.fill();
}
function getPositionFromTarget(evt, target) {
return {
y: evt.pageY - target.offsetTop,
x: evt.pageX - target.offsetLeft
};
}
</script>
</body>
</html>