Feature/8097

[ombalgude]

Resolves #8097

Changes:

This PR adds a new activeCamera() function that provides a standard joint getter/setter API for accessing and modifying the current active camera in p5.js WebGL mode.

Implementation Details:

• Added activeCamera() function: A joint getter/setter that follows the pattern used by other p5.js functions like linePerspective()

  • When called with no arguments: returns the current active p5.Camera object
  • When called with a camera argument: sets that camera as the active camera and returns this for chaining
  • Includes _assert3d() validation to ensure it's only used in WebGL mode

• Added RendererGL.prototype.activeCamera() method: Implements the same getter/setter pattern at the renderer level, reusing existing setCamera() logic

• Comprehensive test suite: Added 5 test cases covering:

  • Getting the current camera (no arguments)
  • Setting the camera (with argument)
  • Multiple camera switching scenarios
  • Chaining behavior
  • Correct camera object reference handling

Benefits:

• Provides a standard API for camera access that's consistent with other p5.js functions
• Enables library creators to write code that works with both V1 and V2 (when V1 support is added)
• Maintains full backward compatibility with existing setCamera() function
• Follows established p5.js patterns for joint getter/setter functions

Files Modified:

• src/webgl/p5.Camera.js: Added fn.activeCamera() and RendererGL.prototype.activeCamera() with full JSDoc documentation and examples
• test/unit/webgl/p5.Camera.js: Added comprehensive test suite for activeCamera() functionality

Screenshots of the change:

N/A - This is a code-only change that adds a new API function. No visual changes.

PR Checklist

• [x] npm run lint passes

• [x] Inline reference is included / updated

• [x] Unit tests are included / updated