edited December 2013 in Using Processing

How do you use the constrain() function to constrain in circle shape instead of rect?


  • edited December 2013

    Do note, that by using constrain() within a circle, your just making it harder. The best way to constrain something in a circle would be to use PVector. Here is an example:

    int mouseDiam = 30;
    int circleDiam = 200;
    void setup() {
      size(500, 500);
    void draw() {
      PVector dist = new PVector(mouseX, mouseY);
      PVector origin = new PVector(width/2, height/2);
      dist.limit(circleDiam/2 - mouseDiam/2);
      translate(width/2, height/2);
      ellipse(0, 0, circleDiam, circleDiam);
      ellipse(dist.x, dist.y, mouseDiam, mouseDiam);

    It is a mouthful, but this is one of the easiest ways to "constrain" a point in a circle.

    -- MenteCode

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