This article describes the method of JS to determine collisions. Share it for your reference. The details are as follows:
JS judging collision method:
Copy the code as follows:/** to determine whether it is colliding
* @param obj Original object
* @param dobj target object
*/
function impact(obj, dobj) {
var o = {
x: getDefaultStyle(obj, 'left'),
y: getDefaultStyle(obj, 'top'),
w: getDefaultStyle(obj, 'width'),
h: getDefaultStyle(obj, 'height')
}
var d = {
x: getDefaultStyle(dobj, 'left'),
y: getDefaultStyle(dobj, 'top'),
w: getDefaultStyle(dobj, 'width'),
h: getDefaultStyle(dobj, 'height')
}
var px, py;
px = ox <= dx ? dx : ox;
py = oy <= dy ? dy : oy;
// Determine whether the points are in both objects
if (px >= ox && px <= ox + ow && py >= oy && py <= oy + oh && px >= dx && px <= dx + dw && py >= dy && py <= dy + dh) {
return true;
} else {
return false;
}
}
/** Get object properties
* @param obj object
* @param attribute attribute
*/
function getDefaultStyle(obj, attribute) {
return parseInt(obj.currentStyle ? obj.currentStyle[attribute] : document.defaultView.getComputedStyle(obj, false)[attribute]);
}
Examples are as follows:
Copy the code as follows:<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title> demo </title>
<style type="text/css">
body{margin:0px;}
.main{position:relative;}
#f1{position:absolute; background:#FF0000; top:100px; left:100px; width:200px; height:200px; z-index:999}
#f2{position:absolute; background:#FFFF00; top:0px; left:0px; width:600px; height:150px;}
</style>
</head>
<body>
<div>
<div id="f1"></div>
<div id="f2"></div>
</div>
<script type="text/javascript">
var o = document.getElementById("f1");
var d = document.getElementById("f2");
alert(impact(o, d));
function impact(obj, dobj) {
var o = {
x: getDefaultStyle(obj, 'left'),
y: getDefaultStyle(obj, 'top'),
w: getDefaultStyle(obj, 'width'),
h: getDefaultStyle(obj, 'height')
}
var d = {
x: getDefaultStyle(dobj, 'left'),
y: getDefaultStyle(dobj, 'top'),
w: getDefaultStyle(dobj, 'width'),
h: getDefaultStyle(dobj, 'height')
}
var px, py;
px = ox <= dx ? dx : ox;
py = oy <= dy ? dy : oy;
// Determine whether the points are in both objects
if (px >= ox && px <= ox + ow && py >= oy && py <= oy + oh && px >= dx && px <= dx + dw && py >= dy && py <= dy + dh) {
return true;
} else {
return false;
}
}
function getDefaultStyle(obj, attribute) {
return parseInt(obj.currentStyle ? obj.currentStyle[attribute] : document.defaultView.getComputedStyle(obj, false)[attribute]);
}
</script>
</body>
</html>
I hope this article will be helpful to everyone's JavaScript programming.