fix: fix other functions to accept 3x3

Author: EscapedGibbon

src/geometry/__tests__/transform.test.ts

@@ -121,5 +121,5 @@ test('should throw if matrix has wrong size', () => {
   ];
   expect(() => {
     img.transform(translation);
-  }).toThrow('transformation matrix must be 2x3. Received 2x4');
+  }).toThrow('transformation matrix must be 2x3 or 3x3. Received 2x4');
 });

src/geometry/transform.ts

@@ -128,7 +128,7 @@ export function transform(
 
   if (!isValidMatrix(transformMatrix)) {
     throw new TypeError(
-      `transformation matrix must be 3x3 or 2x3. Received ${transformMatrix.length}x${transformMatrix[1].length}`,
+      `transformation matrix must be 2x3 or 3x3. Received ${transformMatrix.length}x${transformMatrix[1].length}`,
     );
   }
   if (transformMatrix.length === 2) {

src/geometry/transformRotate.ts

@@ -47,7 +47,7 @@ export function transformRotate(
  * @param angle - Angle in degrees.
  * @param center - Center point of the image.
  * @param scale - Scaling factor.
- * @returns 2 x 3 rotation matrix.
+ * @returns 3 x 3 rotation matrix.
  */
 function getRotationMatrix(
   angle: number,
@@ -60,5 +60,6 @@ function getRotationMatrix(
   return [
     [cos, sin, (1 - cos) * center.column - sin * center.row],
     [-sin, cos, sin * center.column + (1 - cos) * center.row],
+    [0, 0, 1],
   ];
 }