Matt Lundstrom mattlundstrom
mattlundstrom
/ snaptToIncrement.js
Last active
October 24, 2020 21:28
JS Snap a number to an increment
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| /* | |
| val = value to snap | |
| inc = increment to snap to | |
| example: | |
| snapToIncrement(10, 3): 9 | |
| snapToIncrement(89, 10): 100 | |
| snapToIncrement(35.6, .5): 35.5 | |
| */ |
mattlundstrom
/ functionWithDefaultProperties.js
Last active
October 24, 2020 21:30
JS Functions with default properties
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| var func = function( props ){ | |
| props = (typeof props !== "object") ? {} : props; | |
| var mx = props.mx || 10; | |
| var my = props.my || 10; | |
| var mz = props.mz || 10; | |
| var time = props.time || 1; | |
| var delay = props.delay || 0; | |
| var ease = props.ease || Linear.easeNone; |
mattlundstrom
/ rectangle circle collision.js
Last active
October 24, 2020 21:29
JS is a rectangle colliding with a circle?
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| function RectCircleColliding(circle,rect){ | |
| var distX = Math.abs(circle.x - rect.x-rect.w/2); | |
| var distY = Math.abs(circle.y - rect.y-rect.h/2); | |
| if (distX > (rect.w/2 + circle.r)) { return false; } | |
| if (distY > (rect.h/2 + circle.r)) { return false; } | |
| if (distX <= (rect.w/2)) { return true; } | |
| if (distY <= (rect.h/2)) { return true; } |
mattlundstrom
/ once_poll.js
Last active
October 24, 2020 21:30
JS function that can only be fired once.
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| // ONCE | |
| function once(fn, context) { | |
| var result; | |
| return function() { | |
| if(fn) { | |
| result = fn.apply(context || this, arguments); | |
| fn = null; | |
| } |
mattlundstrom
/ iframe communication
Created
March 28, 2016 23:42
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| // FROM http://stackoverflow.com/questions/25098021/securityerror-blocked-a-frame-with-origin-from-accessing-a-cross-origin-frame | |
| In your main page: | |
| var frame = document.getElementById('your-frame-id'); | |
| frame.contentWindow.postMessage(/*any variable or object here*/, '*'); | |
| In your <iframe> (contained in the main page): | |
| window.addEventListener('message', function(event) { |
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| <body onload=setInterval('for(r.width=j=150,i=j*j;--i;)r.getContext(\'2d\').fillRect(i%j,i/j,1,Math.random())',9)><canvas id=r> |
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| Object.getOwnPropertyNames(Math).map(function(p) { | |
| window[p] = Math[p]; | |
| }); | |
| // So instead of Math.random(), just use random(); |
mattlundstrom
/ random
Created
June 3, 2015 23:13
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| function randomRange(min, max) { | |
| return min + Math.random() * (max - min); | |
| } | |
| function randomWeightedRange(min, max, expo) { | |
| return toDecimal(((Math.random() * (max - min)) + min), expo); | |
| } | |
| function randomInt(min, max) { | |
| return Math.floor(min + Math.random() * (max - min + 1)); |
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| function clamp( value, min, max ){ | |
| return Math.min( Math.max( value, min ), max ); | |
| } |
mattlundstrom
/ random Int
Created
June 1, 2015 02:29
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| function randomInt(min,max) { | |
| return Math.floor( min + Math.random() * (max - min + 1) ) | |
| } |
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