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

Core/Environment/Rendering 領域から始め、既存の mask() の動作と、リンクされている p5.js beginClip() のリファレンスを読みます。beginClip()、endClip()、およびオプションの invert フラグがどのように動作すべきかを定義し、その後、呼び出しの間の描画コマンドが期待どおりの通常および反転クリッピング動作を生成することを確認します。