Merge pull request #513 from madscience/feature/rotate

Add `ImageManipulator.rotate` method

src/ImageManipulator.spec.ts

@@ -24,6 +24,17 @@ test('can resize an image', async () => {
   expect(metadata.height).toBe(400);
 });
 
+test('can rotate an image', async () => {
+  const manipulator = new ImageManipulator(fs.readFileSync(path.join(__dirname, 'test-image.png')));
+  const rotatedImage = await manipulator.rotate(90).toBuffer();
+  const metadata = await new ImageManipulator(rotatedImage).readMetadata();
+
+  expect(metadata.mimeType).toBe('image/png');
+  expect(metadata.format).toBe('png');
+  expect(metadata.width).toBe(800);
+  expect(metadata.height).toBe(1280);
+});
+
 test('can apply blur effect to an image', async () => {
   const manipulator = new ImageManipulator(fs.readFileSync(path.join(__dirname, 'test-image.png')));
   const blurredImage = await manipulator.blur(20).toBuffer();

src/ImageManipulator.ts

@@ -1,5 +1,5 @@
 import { Duplex, Readable } from 'stream';
-import sharp, { JpegOptions, Metadata, PngOptions, Sharp, WebpOptions } from 'sharp';
+import sharp, { JpegOptions, Metadata, PngOptions, RotateOptions, Sharp, WebpOptions } from 'sharp';
 import { ImageMetadata } from './ImageMetadata';
 import { ImageDimensions } from './ImageDimensions';
 import { ImageMimeType } from './ImageMimeType';
@@ -103,6 +103,12 @@ export class ImageManipulator {
     return this;
   }
 
+  public rotate(angle?: number, options?: RotateOptions): this {
+    this.image.rotate(angle, options);
+
+    return this;
+  }
+
   public blur(sigma: number | null): this {
     this.image.blur(sigma != null ? sigma : undefined);