Painting With Particles - OpenProcessing

mySketch
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graphics_1[] myGraphis;
​
int i_count;
Boolean b_click=false;
color[] c_c = {#233142, #F95959, #455D7A, #F95959};
//color[] c_c = {#D7AEF3, #94F6F2, #F7F680, #FBD0F5};
​
void setup() {
  size(512*2, 512);
  background(#E3E3E3);
  i_count=50;
  myGraphis = new graphics_1[i_count];
}
​
​
void draw() {
  noStroke();
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  if (b_click) {
​
    for (int i=0; i<myGraphis.length; i++) {
      myGraphis[i].run();
    }
    bg=0;
    
  } else {
    
    fill(#E3E3E3, bg=lerp(bg, 100, 0.001f) );
    rect(0, 0, width, height);
    
  }
​
}
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float bg=0;
​
void mousePressed() {
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  for (int i=0; i<myGraphis.length; i++) {
    int p=(int)random(0, 4);
    myGraphis[i] = new graphics_1(new PVector(mouseX, mouseY), c_c[p]);
  }
​
  b_click=true;
}
​
​
void keyPressed() {
  b_click=false;
}
​
​
​
class graphics_1 {
​
  PVector p_orgPos;
  float f_pointSize=0;
  float f_angle;
  float f_threshold=0.2f;
  float f_decrease;
  float test;
  float f_growSpeed;
  color c_color;
  float lifespan;
​
  graphics_1(PVector pos, color col) {
​
    p_orgPos = new PVector(0, 0);
    p_orgPos = pos;   
    f_pointSize = random(30, 80);
    //f_pointSize=80;
    f_angle = random(TWO_PI);
    f_decrease = random(3, 10);
    test=0;
​
    c_color = col;
    lifespan = 255.0;
    f_growSpeed=Math.round(random(1, 3));
    //println("loc " + p_orgPos.x + " " + p_orgPos.y +" "+ f_angle +" "+ f_decrease);
  }
​
  void run() {
    show();
    update();
  }
​
  void update() {
​
    if (f_pointSize>0 && frameCount%f_growSpeed==0) {
​
      f_angle+=random(-f_threshold, f_threshold);
      f_pointSize-=f_decrease;
      test+=20*noise(frameCount, 2, 3);
    }
    lifespan -= 1.0;
  }
​
  void show() {
​
    PVector tmpPos = new PVector( p_orgPos.x + (test)*cos(f_angle), 
      p_orgPos.y + (test)*sin(f_angle));
​
    //fill(map(f_pointSize, 0, 80, 220, 60), 90);
    //strokeWeight(0.1f);
    //stroke(#E3E3E3);
    
    fill(c_color, 90-f_pointSize);
    ellipse(tmpPos.x, tmpPos.y, f_pointSize, f_pointSize);
  }
​
  boolean isDead() {
    if (lifespan < 0.0) {
      return true;
    } else {
      return false;
    }
  }
}