triangle_pen

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void setup(){

  size(800, 800);

  background(255);

  noStroke();

  frameRate(60);

  smooth();

}

void draw(){

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}

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void mouseDragged(){

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float  r = random(255);

float  g = random(255);

float  b = random(255);

float  a = random(100);

fill(r, g, b, a);

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for(int i = 0; i < 20; i ++){

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float x2 = random(10);

float y2 = random(-5);

float x3 = random(10);

float y3 = random(-5);

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  triangle(mouseX, mouseY, x2*i , y2*i, x3*i, y3*i);

}

}

​