Created
August 17, 2012 07:06
-
-
Save hitode909/3376638 to your computer and use it in GitHub Desktop.
★がマウスを追い掛けるやつ
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.0/jquery.min.js"></script> | |
| <script src="stalker.js"></script> | |
| </head> | |
| <body> | |
| </body> | |
| </html> |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| $(function() { | |
| var requestAnimationFrame = (function() { | |
| return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function(callback, element) { | |
| return window.setTimeout(function() { | |
| return callback(); | |
| }, 1000 / 60); | |
| }; | |
| })(); | |
| var queue = []; | |
| var step = function() { | |
| queue.forEach(function(f) { | |
| f(); | |
| }); | |
| requestAnimationFrame(step); | |
| }; | |
| requestAnimationFrame(step); | |
| var target = { | |
| x: 0, | |
| y: 0 | |
| }; | |
| var timer; | |
| $(document).on('mousemove', function(event) { | |
| if (timer) return; | |
| timer = setTimeout(function() { | |
| timer = null; | |
| }, 100); | |
| target.x = event.pageX; | |
| target.y = event.pageY; | |
| }); | |
| function new_stalker() { | |
| var $star = $('<div>') | |
| .text('★') | |
| .css({ | |
| position: 'absolute', | |
| color: "hsl(" + (Math.random()*360) + ", 100% ,50%)" | |
| }) | |
| .appendTo('body'); | |
| var current = { | |
| x: Math.random() * 1000, | |
| y: Math.random() * 1000 | |
| }; | |
| var vector = { | |
| x: 0, | |
| y: 0 | |
| }; | |
| var speed = 2.0; | |
| var friction = 0.99; | |
| var step = function() { | |
| var tan = (target.y - current.y) / (target.x - current.x); | |
| var theta = Math.atan(tan); | |
| if (target.x - current.x < 0) theta += Math.PI; | |
| vector.x += Math.cos(theta) * speed; | |
| vector.y += Math.sin(theta) * speed; | |
| vector.x *= friction; | |
| vector.y *= friction; | |
| current.x += vector.x; | |
| current.y += vector.y; | |
| $star.css({ | |
| left: Math.floor(current.x) + 'px', | |
| top: Math.floor(current.y) + 'px' | |
| }); | |
| }; | |
| queue.push(step); | |
| }; | |
| var t; | |
| $(document).on('mousedown', function () { | |
| t = setInterval(new_stalker, 10); | |
| }); | |
| $(document).on('mouseup', function () { | |
| clearInterval(t); | |
| }); | |
| }); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment