How to create a reverse fill? Possible?

Processing Coding Questions
1

Hello!

I am trying to figure out how to create a reverse fill of this shape that I have drawn. The purpose of the reverse fill will be to block out some other shapes that I’m drawing outside the borders of this original shape.

Here is the shape:


void setup() {
  size(1080,1080);
  background(0);
}

void draw() {
  pushMatrix();
  translate(width/2,height/2);
  beginShape();
  noFill();
  stroke(255);
  for (float a = 0; a < TWO_PI; a+=0.01) {
   float r = 400;
   float x = r * pow(cos(a),3);
   float y = r * sin(a);
   vertex(x*0.5,y);
  }
  endShape();
  popMatrix();
}

Attached is an illustration of the reverse fill that I created using Photoshop, but I’m wondering if I can create the black section programmatically to give me the ability to morph (grow and shrink) the black, reverse fill section along with the original shape in real-time. Let me know if this makes sense or if there are any questions!

Thanks for any help in advance!

cocoon-reversefill
cocoon-reversefill1080×1080 22.8 KB

2

Ended up figuring this one out. For anyone interested, the beginContour() and endContour() functions allow you to do this!

https://processing.org/reference/PShape_beginContour_.html

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