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validation for bounding box collision detection
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Optimised, can detect a non collision in one compare, minimally | |
collision.html | |
-------------- | |
<head> | |
<title>intersect</title> | |
</head> | |
<body> | |
<h1>Box intersection</h1> | |
<p> | |
corner 1: front, top, right | |
<br/> | |
corner 2: back, bottom, left | |
</p> | |
{{> boxA}} | |
{{> boxB}} | |
{{> check}} | |
</body> | |
<template name="boxA"> | |
<p> | |
Box A | |
<br/> | |
corner 1 20, 20, 20 | |
<br/> | |
corner 2 10, 10, 10 | |
</p> | |
</template> | |
<template name="boxB"> | |
<p> | |
Box B | |
<br/> | |
corner 1 <input class='value' id="front" value='30'>, <input class='value' id="top" value='30'>, <input class='value' id="right" value='30'> | |
<br/> | |
corner 2 <input class='value' id="back" value='25'>, <input class='value' id="bottom" value='25'>, <input class='value' id="left" value='25'> | |
</p> | |
</template> | |
<template name="check"> | |
<p id="result"></p> | |
</template> | |
collision.coffee | |
---------------- | |
if Meteor.isClient | |
Template.boxB.events | |
"blur .value": -> Template.check.calculate() | |
Template.check.calculate = ()-> | |
a_front = 20 | |
a_back = 10 | |
a_left = 10 | |
a_right = 20 | |
a_top = 20 | |
a_bottom = 10 | |
b_front = $("#front").val() | |
b_back = $("#back").val() | |
b_left = $("#left").val() | |
b_right = $("#right").val() | |
b_top = $("#top").val() | |
b_bottom = $("#bottom").val() | |
fb = a_front > b_back | |
bf = a_back < b_front | |
rl = a_right > b_left | |
lr = a_left < b_right | |
tb = a_top > b_bottom | |
bt = a_bottom < b_top | |
intersects = fb && bf && rl && lr && tb && bt | |
$("#result").text "intersects #{intersects}" | |
Template.check.rendered = -> | |
Template.check.calculate() |
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