// All Examples Written by Casey Reas and Ben Fry

// unless otherwise stated.

PVector[] p = new PVector[3];

float shift = 1.0;

float fade = 0;

float fillCol = 0;

float rot = 0;

float spin = 0;



void setup() {

  size(200, 200);

  background(0);

  smooth();

  fade = 255.0 / (width/2.0/shift);

  spin = 360.0 / (width/2.0/shift);

  p[0] = new PVector(-width/2, height/2);

  p[1] = new PVector(width/2, height/2);

  p[2] = new PVector(0, -height/2);

  noStroke();

  translate(width/2, height/2);

  triBlur();

}



void triBlur() {

  fill(fillCol);

  fillCol += fade;

  rotate(spin);

  // another interesting variation: uncomment the line below 

  // rotate(rot+=radians(spin));

  triangle(p[0].x += shift, p[0].y -= shift/2, 

           p[1].x -= shift, p[1].y -= shift/2, 

           p[2].x, p[2].y += shift); 

  if (p[0].x < 0) {

    // recursive call

    triBlur();

  }

}