Add `beginClip()` and `endClip()` masking functions

Relevant sub-area for this feature?

Core/Environment/Rendering

Feature details

Feature description

Add beginClip() and endClip() to define clipping masks using drawing commands. Shapes drawn between these calls become the mask. An optional invert flag enables inverse masking.

Benefits

• More intuitive and less verbose than mask()
• Matches p5.js API and reduces cognitive load when switching from one to the other

Challenges

• Not sure

Additional context

See https://p5js.org/reference/p5/beginClip/

Example code

This mask() code...

  // Create pattern graphics
  pattern = createGraphics(width, height);
  pattern.beginDraw();
  pattern.background(255);
  pattern.stroke(0);
  pattern.strokeWeight(2);
  for (int x = 0; x < width; x += 10) {
    pattern.line(x, 0, x, height);
  }
  pattern.endDraw();

  // Create mask graphics (white circle on black)
  maskImg = createGraphics(width, height);
  maskImg.beginDraw();
  maskImg.background(0);
  maskImg.noStroke();
  maskImg.fill(255);
  maskImg.ellipse(width/2, height/2, 200, 200);
  maskImg.endDraw();

  // Apply mask to pattern
  pattern.mask(maskImg);

... becomes this using beginClip()/endClip():

  // Define clipping region
  beginClip();
  ellipse(width/2, height/2, 200, 200);
  endClip();

  // Draw pattern inside the clip
  stroke(0);
  strokeWeight(2);
  for (int x = 0; x < width; x += 10) {
    line(x, 0, x, height);
  }

Would you like to help implement this feature?

No, I’m just suggesting the feature

Commencez dans la zone Core/Environment/Rendering en lisant le comportement existant de mask() et la référence liée de p5.js beginClip(). Définissez le fonctionnement attendu de beginClip(), endClip() et du flag invert facultatif, puis vérifiez que les commandes de dessin entre les appels produisent le comportement de découpage normal et inversé attendu.