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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Tween Example</title>
<style type="text/css">
#viewport {
width: 500px;
height: 300px;
border: 1px solid black;
}
#block {
width: 10px;
height: 10px;
background-color: red;
position: absolute;
}
</style>
<script src="../../lib/OpenLayers.js"></script>
<script type="text/javascript">
var tween, events;
function init(){
tween = new OpenLayers.Tween(OpenLayers.Easing.Linear.easeIn);
events = new OpenLayers.Events(null, OpenLayers.Util.getElement('viewport'), null, true);
events.register("mousedown", null, moveBlock);
changeTween();
}
function moveBlock(e) {
var block = OpenLayers.Util.getElement('block');
var viewport = OpenLayers.Util.getElement('viewport');
var blockPosition = OpenLayers.Util.pagePosition(block);
var viewportPosition = OpenLayers.Util.pagePosition(viewport);
e.xy = events.getMousePosition(e);
var from = {
x: blockPosition[0] - viewportPosition[0],
y: blockPosition[1] - viewportPosition[1]
};
var to = {
x: e.xy.x,
y: e.xy.y
}
var duration = OpenLayers.Util.getElement('duration').value;
var callbacks = {
eachStep: function(value) {
block.style.left = (value.x + viewportPosition[0]) + 'px';
block.style.top = (value.y + viewportPosition[1]) + 'px';
}
}
tween.start(from, to, duration, {callbacks: callbacks});
}
function changeTween() {
var transition = OpenLayers.Util.getElement('transition').value;
var easing = OpenLayers.Util.getElement('easing').value;
tween.stop();
tween.easing = OpenLayers.Easing[transition][easing];
}
</script>
</head>
<body onload="init()">
<div id="title">Tween Example</div>
<div id="tags"></div>
<div id="shortdesc">Show transition effects</div>
<select name="transition" id="transition" onchange="changeTween()">
<option value="Linear">Linear</option>
<option value="Expo">Expo</option>
<option value="Quad">Quad</option>
</select>
<select name="easing" id="easing" onchange="changeTween()">
<option value="easeIn">EaseIn</option>
<option value="easeOut">EaseOut</option>
</select>
<input type="text" name="duration" id="duration" value="100"></input>
<div id="viewport">
<div id="block"></div>
</div>
<div id="docs">
This is an example of transition effects.
</div>
</body>
</html>
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