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function setup() {
createCanvas(windowWidth, windowHeight);
background(0);
}
function draw() {
stroke(255, 255, 255);
//stroke(255, 255, 255, 100);
noFill();
fill(255, 255, 255, 10);
point(mouseX, mouseY);
triangle(mouseX, mouseY, 100, 100); // position x, y, width, height
circle(0, 0, mouseX, mouseY);
}