Cardioid and more

int n = 300;

float delta;

float factor;

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void setup(){

size(600,600);

delta = 2*PI/n;

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}

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void draw(){

factor = 8*mouseX/width;

background(50);

translate(width/2, height/2);

stroke(30);

strokeWeight(3);

noFill();

ellipse(0,0,400,400);

stroke(240);

strokeWeight(5);

for(int i = 0; i < n; i ++){

point(200*cos(i*delta), 200*sin(i*delta));

strokeWeight(1);

line(200*cos(i*delta), 200*sin(i*delta), 200*cos(factor*i*delta), 200*sin(factor*i*delta));

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}

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}