// All Examples Written by Casey Reas and Ben Fry

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// unless otherwise stated.

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PVector[] p = new PVector[3];

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float shift = 1.0;

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float fade = 0;

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float fillCol = 0;

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float rot = 0;

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float spin = 0;

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void setup() {

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  size(200, 200);

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  background(0);

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  smooth();

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

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

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

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

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

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  noStroke();

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  translate(width/2, height/2);

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  triBlur();

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}

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void triBlur() {

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  fill(fillCol);

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  fillCol += fade;

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  rotate(spin);

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  // another interesting variation: uncomment the line below 

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

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

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

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

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

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    // recursive call

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    triBlur();

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  }

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}