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function setup(){
createCanvas(windowWidth, windowHeight);
}
function draw (){
background(35);
strokeWeight(10);
stroke(0,127,255);
point(mouseX,mouseY);
line(0,0,mouseX,mouseY);
line(width,height,mouseX,mouseY);
line(0,height,mouseX,mouseY);
line(width,0,mouseX,mouseY);
}