Transformations such as translate(), rotate(), and scale() do not work within beginShape(). It is also not possible to use other shapes, such as ellipse() or rect() within beginShape().

1. int steps;
2. float radius;
3. 
   
4. void setup() {
5.   size(800,800);
6.   smooth();
7.   noFill();
8.   strokeWeight(10);
9. }
10. 
    
11. void draw() {
12.   background(255);
13.   steps = (int) mouseY / 10;
14.   radius = 50 + mouseX/3;
15.   beginShape(POINTS);
16.   for(int i=0; i<steps+1; i++) {
17.     float x = width/2+sin( TWO_PI/steps*i)*radius;
18.     float y = height/2+cos( TWO_PI/steps*i)*radius;
19.     vertex(x,y);
20.   }
21.   endShape();
22. }