This sketch is created with an older version of Processing,
and doesn't work on browsers anymore.
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void setup (){
size (800,400);
background (random (255),random (100),random (150));
}
void draw (){
stroke (random (255),random (200),random (150));
fill (random (255),random (100),random (150),50);
quad ( mouseX,100,50, mouseY,mouseY,200,200,mouseX);
}
void mousePressed (){
saveFrame();
}