Drop and Burn - OpenProcessing

mySketch
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var things=[];
var img;
var brushSize = 1;
var slider;
​
p5.disableFriendlyErrors = true//speed up
​
function setup() {
  cnv=createCanvas(windowWidth, windowHeight);
  img=createGraphics(width,height);
  img.background(250,255,240);
  img.textAlign(LEFT,TOP)
  img.textSize(18)
  img.textFont("New Roman Times")
  img.text("Drag and drop an image to burn it.",2,5)
  cnv.drop(getImage);
  slider = createSlider(width/8, width, width/4);
  slider.position(20,height-22);
  slider.style('width', (width-46)+'px');
}
​
function draw() {
  brushSize=slider.value()/width*4
  image(img,0,0)
  noStroke();
  img.noStroke();
  for(var i = 0;i < things.length; i++){
    things[i].x+=cos(things[i].a)
    things[i].y+=sin(things[i].a)
    things[i].y-=2-things[i].s/12/things[i].startS
    things[i].s--;
    fill(255-things[i].s*1.2/things[i].startS,things[i].s*10/things[i].startS,0);
    ellipse(things[i].x,things[i].y,things[i].s,things[i].s)
    triangle(things[i].x+things[i].s/2,things[i].y,things[i].x-things[i].s/2,things[i].y,things[i].x,things[i].y-sqrt(things[i].s)*2)
    if(random(0,1)<0.2){
      if(random(0,1)<0.2){
        img.fill(6,4,2,8);
        img.ellipse(things[i].x,things[i].y,things[i].s+6,things[i].s+6)
      }
      img.fill(10,6,4,1);
      img.ellipse(things[i].x,things[i].y,things[i].s+12,things[i].s+12)
      img.fill(10,6,4,2);
      img.ellipse(things[i].x,things[i].y,things[i].s+8,things[i].s+8)
      img.fill(10,6,4,3);
      img.ellipse(things[i].x,things[i].y,things[i].s+5,things[i].s+5)
    }
    if(things[i].s<=1){
      things.splice(i,1)
    }
  }
  if(mouseIsPressed){
    for(var j = 0;j < 3;j++){
      things[things.length] = {x:mouseX+random(-3*brushSize,3*brushSize),y:mouseY+random(-3*brushSize,3*brushSize),a:random(0,PI*2),s:random(24,26)*brushSize,startS:brushSize}
    }
  }
}
​
function getImage(file) {
  if (file.type === 'image') {
    imgLoad = createImg(file.data)
    var x = random(0,random(width/4,img.width-imgLoad.width));
    var y = random(0,random(height/4,img.height-imgLoad.height));
    img.fill(0,200);
    img.rect(x+1,y+0.8,imgLoad.width,imgLoad.height)
    img.fill(0,120);
    img.rect(x+2,y+1.6,imgLoad.width,imgLoad.height)
    img.fill(0,60);
    img.rect(x+3,y+2.4,imgLoad.width,imgLoad.height)
    img.image(imgLoad,x,y);
  } else {
    print('Not an image file!');
  }
}