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float distance;
void setup() {
size(500, 500);
}
void draw() {
for (int i=0;i<20;i++) {
fill(247, dist(mouseX, mouseY, 0, 0), 106);
rect(0, 0, width, height);
}
fill(247, 62, 106);
distance=dist(mouseX, mouseY, width/2, height/2);
noStroke();
ellipse(width/2, height/2, distance, distance);
}