Foundation HTML5 Animation with JavaScriptの勉強
JavaScriptのアニメーションを勉強する
流し読みでやってみる。
CHAPTER 2 のMouse eventsをやってみる。
マウスイベントの取得
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Mouse Events</title>
<style>
#canvas {
background: #000;
}
</style>
</head>
<body>
<canvas id="canvas" width="400" height="400"></canvas>
<script>
window.onload = function () {
var canvas = document.getElementById('canvas');
function onMouseEvent (event) {
console.log(event.type);
}
canvas.addEventListener('mousedown', onMouseEvent, false);
canvas.addEventListener('mouseup', onMouseEvent, false);
canvas.addEventListener('click', onMouseEvent, false);
canvas.addEventListener('dblclick', onMouseEvent, false);
canvas.addEventListener('mousewheel', onMouseEvent, false);
canvas.addEventListener('mousemove', onMouseEvent, false);
canvas.addEventListener('mouseover', onMouseEvent, false);
canvas.addEventListener('mouseout', onMouseEvent, false);
};
</script>
</body>
</html>
黒いエリアで各種マウスイベントが取得できるというソース。
取得できるイベントは以下になる。
取得結果はconsoleに出力されている。
- mousedown
- mouseup
- click
- dblclick
- mousewheel
- mousemove
- mouseover
- mouseout
マウスの座標を取得する
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Mouse Position</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<canvas id="canvas" width="400" height="400"></canvas>
<script>
var utils = {};
utils.captureMouse = function (element) {
var mouse = {x: 0, y: 0};
element.addEventListener('mousemove', function (event) {
var x, y;
if (event.pageX || event.pageY) {
x = event.pageX;
y = event.pageY;
} else {
x = event.clientX + document.body.scrollLeft +
document.documentElement.scrollLeft;
y = event.clientY + document.body.scrollTop +
document.documentElement.scrollTop;
}
x -= element.offsetLeft;
y -= element.offsetTop;
mouse.x = x;
mouse.y = y;
}, false);
return mouse;
};
window.onload = function () {
var canvas = document.getElementById('canvas'),
mouse = utils.captureMouse(canvas);
canvas.addEventListener('mousedown', function () { console.log("x: " + mouse.x + ", y: " + mouse.y);
}, false);
};
</script>
</body>
</html>