// Viral Expansion 3
// by John Clavin

float R1, G1, B1;
float R2, G2, B2;
color levelColor1;
color levelColor2;
int radius = 10;
float angle1;
float angle2;
float angle180 = PI;
float angle90 = TWO_PI/4;
float angle45 = TWO_PI/8;
float angle30 = TWO_PI/12;
float angle15 = TWO_PI/24;
int newX1, newY1, newX2, newY2;

void setup() 
{
  size(700, 500);
  background(220);
  stroke(0);
  fill(60);
  smooth();
  frameRate(.25);
}

void draw() {
  setColor();
  background(220);
  explode(width/2, height/2, 15, PI/2);
}
  
void explode(int x, int y, int level, float angle) {
  angle1 = angle + angle90 + angle45 + random(-.5, .5);
  angle2 = angle - (angle90 + angle45) + random(-.5, .5);
  R1 += .0075;
  G1 -= .0075;
  levelColor1 = color(R1, G1, B1);
  R2 += .0075;
  G2 += .0065;
  B2 -= .0075;
  levelColor2 = color(R2, G2, B2);
  ellipse(x, y, 8, 8);
  newX1 = int(radius*cos(angle1))+x;
  newY1 = int(radius*sin(angle1))+y;
  newX2 = int(radius*cos(angle2))+x;
  newY2 = int(radius*sin(angle2))+y;
  if(level > 1) {
    level--;
    fill(levelColor1);
    explode(newX1, newY1, level, angle1);
    fill(levelColor2);
    explode(newX2, newY2, level, angle2);
  }
}

void setColor() {
  fill(60);
  R1 = 0;
  G1 = 255;
  B1 = 0;
  R2 = 0;
  G2 = 0;
  B2 = 240;
}