// Create the variables.
Point[]p = new Point[3];
float shift = 2.0;
float spin = 0;

// Setup the sketch.
void setup(){
  size(800, 800);
  background(0);
  smooth();
  noStroke();
}

void draw() {
  spin = 360.0/(width/2.0/shift);
  p[0] = new Point(-width/2, height/2);
  p[1] = new Point(width/2, height/2);
  p[2] = new Point(0, -height/2);

  // Centre the spiral
  translate(width/2, height/2);
  
  // Call the spiral function and define the parameters.
  //if (mousePressed && (mouseButton == LEFT)) {
  spiral(mouseY, pmouseY, mouseX);
  //}
}

// Create the spiral function with 3 parameters.
void spiral(float shift1, float shift2, float shift3){
  
  // Control the rotation of the spiral.
  // Additional rotate()'s can be added for different effects.
  rotate(spin);
  rotate(PI/3.0);

  // Define the fill colour.
  float r = random(100, 255);
  float g = random(100, 255);
  float b = random(100, 255);
  fill(r, g, b, 10);

  // Create the triangle
  triangle(p[0].x+=shift, p[0].y-=shift/(random(shift1)), p[1].x-=shift, p[1].y-=shift/(random(shift2)), p[2].x, p[2].y+=shift*(random(shift3)));

  // Determine the requirements for recursion.
  if(p[0].x<0){

    // recursive call
    spiral(shift1, shift2, shift3);
  }
}