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function setup() {
createCanvas(400, 400);
}
function arrow(x, y, angle, w, tip_w) {
angle = 2*PI-angle;
line(x ,y, x+w*cos(angle), y+w*sin(angle))
push();
translate(x+w*cos(angle), y+w*sin(angle));
rotate(angle-PI);
rotate(radians(15));
line(0, 0, tip_w, 0);
rotate(radians(-2*15));
line(0, 0, tip_w, 0);
pop();
}
function draw() {
background(220);
arrow(width/2, height/2, radians(15*15), 100, 10);
}