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Simple JavaScript Particles
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| <html> | |
| <head> | |
| </head> | |
| <body> | |
| <canvas id="base" width="500" height="500" style="border: 1px solid #444; background: #000;"></canvas> | |
| <script> | |
| var elem = document.getElementById( 'base' ); | |
| var context = elem.getContext( '2d' ); | |
| var Sprite = function () { | |
| this.size = 20; | |
| this.radius = Math.floor( this.size / 2 ); | |
| this.p_x = Math.floor( Math.random() * 500 ); | |
| this.p_y = Math.floor( Math.random() * 500 ); | |
| this.x_speed = Math.floor( Math.random() * 7 ) - 3; | |
| this.y_speed = Math.floor( Math.random() * 7 ) - 3; | |
| if( this.x_speed == 0 && this.y_speed == 0 ) { this.x_speed = 1; } | |
| this.clear = function () { | |
| context.clearRect( this.p_x, this.p_y, this.size, this.size ); | |
| }; | |
| this.draw = function () { | |
| this.radgrad = context.createRadialGradient( this.p_x + this.radius, this.p_y + this.radius, 0, this.p_x + this.radius, this.p_y + this.radius, this.radius ); | |
| this.radgrad.addColorStop( 0, 'rgba(255,255,255,255)' ); | |
| this.radgrad.addColorStop( 1, 'rgba(255,255,255,0)' ); | |
| context.fillStyle = this.radgrad; | |
| context.fillRect( this.p_x, this.p_y, this.size, this.size ); | |
| }; | |
| this.move = function () { | |
| this.p_x = this.x_speed + this.p_x; | |
| this.p_y = this.y_speed + this.p_y; | |
| }; | |
| this.draw(); | |
| } | |
| var ParticleManager = function ( count ) { | |
| this.sprites = []; | |
| for( var x = 0; x < count; ++x ) { | |
| this.sprites.push( new Sprite() ); | |
| } | |
| this.start = function () { | |
| var mgr = this; | |
| this.interaval = setInterval( function () { mgr.move(); }, 50 ); | |
| }; | |
| this.move = function () { | |
| for( var i in this.sprites ) { | |
| this.sprites[i].clear(); | |
| this.sprites[i].move(); | |
| } | |
| for( var i in this.sprites ) { | |
| this.sprites[i].draw(); | |
| } | |
| }; | |
| } | |
| var pm = new ParticleManager( 200 ); | |
| pm.start(); | |
| </script> | |
| </body> | |
| </html> |
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