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function setup() {
wW=windowWidth;
wH=windowHeight;
createCanvas(wW, wH);
background(100);
}
function draw() {
strokeWeight(3);
background(100);
stroke(100,50,100);
line(0, 0, mouseX, mouseY);
line(wW, 0, mouseX, mouseY);
line(0, wH, mouseX, mouseY);
line(wW, wH, mouseX, mouseY);
}