/**
 * Sparkles
 * By Raphael Rouvinov-Kats
 * */

var X=0, Y=1, DX=2, DY=3, SIZE=4;
var sparkles = [];

var draw = function() {
    background(0, 0, 0);
    
    for(var i = 0; i < sparkles.length; i++) {
        stroke(random(185, 255), random(175, 245), random(0, 20));
        strokeWeight(sparkles[i][SIZE]);
        line(sparkles[i][X], sparkles[i][Y], sparkles[i][X] + sparkles[i][DX], sparkles[i][Y] + sparkles[i][DY]);
    }
    
    for(var i = 0; i < (mouseIsPressed ? 20 : 2); i++) {
        sparkles.push([mouseX, mouseY, random(-10, 10), random(-15, 10), random(1, 4)]);
    }
    
    
    var i = 0;
    while(i < sparkles.length) {
      if(sparkles[i][SIZE] < 0.1) {
         sparkles.slice(i, i+1);
         //continue;
      }
      
      i++;
    }
    
    var len = sparkles.length;
    for(var i = 0; i < len; i++) {
        var s = sparkles[i];
        if(s[SIZE] >= 1 && random(0, 1) < 0.5) {
            var nx = s[X] + s[DX] * random(0.1, 2.0);
            var ny = s[Y] + s[DY] * random(0.1, 2.0);
            var ndx = s[DX] * random(0.5, 0.9);
            var ndy = s[DY] * random(0.5, 0.9);
            var ns = s[SIZE] * random(0.2, 0.9);
            sparkles.push([nx, ny, ndx, ndy, ns]);
        }
        
        sparkles[i][SIZE] *= 0.9;
        sparkles[i][X] += sparkles[i][DX];
        sparkles[i][Y] += sparkles[i][DY];
        sparkles[i][DY] += 1;
    }
    
    
    while(sparkles.length > 2000) {
      sparkles.shift();  
    }
};