lkarch.org/tools/radius-raid/js/particleemitter.js
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43 lines
1.5 KiB
JavaScript

/*==============================================================================
Init
==============================================================================*/
$.ParticleEmitter = function( opt ) {
for( var k in opt ) {
this[k] = opt[k];
}
this.particles = [];
for( var i = 0; i < this.count; i++ ) {
var radius = Math.sqrt( Math.random() ) * this.spawnRange,
angle = Math.random() * $.twopi,
x = this.x + Math.cos( angle ) * radius,
y = this.y + Math.sin( angle ) * radius;
this.particles.push( new $.Particle( {
parent: this.particles,
x: x,
y: y,
speed: $.util.rand( this.minSpeed, this.maxSpeed ),
friction: this.friction,
direction: $.util.rand( this.minDirection, this.maxDirection ),
lineWidth: $.util.rand( 0.5, 1.5 ),
hue: this.hue,
saturation: this.saturation
} ) );
}
};
/*==============================================================================
Update
==============================================================================*/
$.ParticleEmitter.prototype.update = function( i ) {
var i2 = this.particles.length; while( i2-- ){ this.particles[ i2 ].update( i2 ) }
if( this.particles.length <= 0 ) {
$.particleEmitters.splice( i, 1 );
}
};
/*==============================================================================
Render
==============================================================================*/
$.ParticleEmitter.prototype.render = function( i ) {
var i2 = this.particles.length; while( i2-- ){ this.particles[ i2 ].render( i2 ) }
};