feat: [#2468] add clone() method to ex.SpriteSheet

CHANGELOG.md

@@ -19,6 +19,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 - Added the emitted particle transform style as part of `ex.ParticleEmitter({particleTransform: ex.ParticleTransform.Global})`, [[ParticleTransform.Global]] is the default and emits particles as if they were world space objects, useful for most effects. If set to [[ParticleTransform.Local]] particles are children of the emitter and move relative to the emitter as they would in a parent/child actor relationship.
 - Added `wasButtonReleased` and `wasButtonPressed` methods to [[ex.Input.Gamepad]]
+- Added `clone()` method to `ex.SpriteSheet` 
 
 ### Fixed
 

src/engine/Graphics/SpriteSheet.ts

@@ -196,4 +196,12 @@ export class SpriteSheet {
       columns: cols
     });
   }
+
+  public clone(): SpriteSheet {
+    return new SpriteSheet({
+      sprites: this.sprites.map(sprite => sprite.clone()),
+      rows: this.rows,
+      columns: this.columns
+    });
+  }
 }

src/spec/SpriteSheetSpec.ts

@@ -136,4 +136,24 @@ describe('A SpriteSheet for Graphics', () => {
     expect(ss.getSprite(1, -1)).toBeNull();
     expect(logger.warn).toHaveBeenCalledWith('No sprite exists in the SpriteSheet at (1, -1), y: -1 should be between 0 and 3');
   });
+
+  it('can be cloned', async () => {
+    const image = new ex.ImageSource('src/spec/images/GraphicsTextSpec/spritefont.png');
+
+    await image.load();
+    const ss = new ex.SpriteSheet({
+      sprites: [ex.Sprite.from(image)],
+      rows: 5,
+      columns: 5
+    });
+
+    const clone = ss.clone();
+
+    expect(ss).not.toBe(clone);
+    expect(ss.getSprite(0, 0)).not.toBe(clone.getSprite(0,0));
+    expect(ss.sprites.length).toBe(clone.sprites.length);
+    expect(ss.rows).toBe(clone.rows);
+    expect(ss.columns).toBe(clone.columns);
+
+  });
 });