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function setup() {
createCanvas(600, 600);
background(0);
}
function draw() {
if (mouseIsPressed) {
var gradient = map(mouseX,1,600,1,200);
strokeWeight(10);
stroke (134+gradient, 5, 245);
line (mouseX, mouseY,300, mouseY);
line (width-mouseX, mouseY,300, mouseY);
}
}