void setup(){
 size (400,400);
 background(200, 0, 255);
 frameRate(4);
 strokeWeight(1);
 stroke(250);
}
void drawTriangle(float x, float y, float x2, float y2,float x3, float y3)
{
 beginShape();
 vertex (x,y);
 vertex(x2,y2);
 vertex(x3, y3);
 endShape();
}
void draw(){
 drawTriangle(random(400,0),random(400,0),random(0,400),random(0,400),random(0,0),random(0,0));
 fill(random(0,255),random(0,255),random(0,255),random(50,100));
}