--- title: "Drawing an upright stamp annotation on a rotated page" canonical_url: "https://www.nutrient.io/guides/ios/knowledge-base/drawing-an-upright-stamp-annotation-on-a-rotated-page/" md_url: "https://www.nutrient.io/guides/ios/knowledge-base/drawing-an-upright-stamp-annotation-on-a-rotated-page.md" last_updated: "2026-05-25T18:42:17.763Z" description: "When using a custom appearance stream generator to draw a stamp annotation, you’ll have to take care of the rotation offset of the page when drawing the image." --- When using a [custom appearance stream generator](https://www.nutrient.io/api/ios/documentation/pspdfkit/annotation/appearancestreamgenerator) to draw a stamp annotation, you’ll have to take care of the rotation offset of the page when drawing the image. Here’s sample code demonstrating the counter-rotation: ### SWIFT ```swift func addUprightStampAnnotation () { // We need to fetch the `pageInfo` for the page in which the stamp annotation needs to be drawn. let pageInfo = document.pageInfoForPage(at: 0) // Here, we get the rotation of the page and convert it to radians. let rotation = CGFloat((pageInfo!.rotationOffset.rawValue + pageInfo!.savedRotation.rawValue) % 360) * CGFloat.pi / 180 let image: UIImage = UIImage.init(named: "stamp-image")! let stampAnnotation = StampAnnotation() stampAnnotation.boundingBox = CGRect(x: 200, y: 200, width: 50, height: 50) let appearanceStreamGenerator = FileAppearanceStreamGenerator(fileURL: URL(fileURLWithPath: "")) appearanceStreamGenerator.drawingBlock = { context in var transform = CGAffineTransform.identity // First, translate and go to the center of the stamp annotation. transform = transform.translatedBy(x: stampAnnotation.boundingBox.origin.x + (stampAnnotation.boundingBox.size.width / 2), y: stampAnnotation.boundingBox.origin.y + (stampAnnotation.boundingBox.size.height / 2)) // Now, rotate the context in the opposite direction of the page rotation. transform = transform.rotated(by: -1 * rotation) // Translate back to origin. transform = transform.translatedBy(x: -1 * (stampAnnotation.boundingBox.origin.x + (stampAnnotation.boundingBox.size.width / 2)), y: -1 * (stampAnnotation.boundingBox.origin.y + (stampAnnotation.boundingBox.size.height / 2))) context.concatenate(transform) // Draw the image now. context.draw(image.cgImage!, in: stampAnnotation.boundingBox) } stampAnnotation.appearanceStreamGenerator = appearanceStreamGenerator document.add(annotations: [stampAnnotation]) } ``` ### OBJECTIVE-C ```objc - (void)addUprightStampAnnotation { PSPDFDocument *document; // We need to fetch the `pageInfo` for the page in which the stamp annotation needs to be drawn. PSPDFPageInfo *pageInfo = [document pageInfoForPageAtIndex:0]; // Here, we get the rotation of the page and convert it to radians. CGFloat rotationInDegrees = (CGFloat)pageInfo.rotationOffset + (CGFloat)pageInfo.savedRotation; CGFloat rotation = rotationInDegrees * M_PI / 180; UIImage *image = [UIImage imageNamed:@"stamp-image"]; PSPDFStampAnnotation *stampAnnotation = [[PSPDFStampAnnotation alloc] init]; stampAnnotation.boundingBox = CGRectMake(200, 200, 50, 50); PSPDFFileAppearanceStreamGenerator *appearanceStreamGenerator = [[PSPDFFileAppearanceStreamGenerator alloc] initWithFileURL:[NSURL new]]; [appearanceStreamGenerator setDrawingBlock:^(CGContextRef context) { CGAffineTransform transform = CGAffineTransformIdentity; // First, translate and go to the center of the stamp annotation. transform = CGAffineTransformTranslate(transform, stampAnnotation.boundingBox.origin.x + (stampAnnotation.boundingBox.size.width / 2), stampAnnotation.boundingBox.origin.y + (stampAnnotation.boundingBox.size.height / 2)); // Now, rotate the context in the opposite direction of the page rotation. transform = CGAffineTransformRotate(transform, -1 * rotation); // Translate back to origin. transform = CGAffineTransformTranslate(transform, -1 * (stampAnnotation.boundingBox.origin.x + (stampAnnotation.boundingBox.size.width / 2)), -1 * (stampAnnotation.boundingBox.origin.y + (stampAnnotation.boundingBox.size.height / 2))); CGContextConcatCTM(context, transform); // Draw the image now. CGContextDrawImage(context, stampAnnotation.boundingBox, image.CGImage); }]; stampAnnotation.appearanceStreamGenerator = appearanceStreamGenerator; [document addAnnotations:@[stampAnnotation] options:nil]; } ``` --- ## Related pages - [Adjusting Size Of Popovers](/guides/ios/knowledge-base/adjusting-size-of-popovers.md) - [Customize PDF rendering on iOS](/guides/ios/knowledge-base/customize-document-rendering.md) - [Adding Swipe Gesture Recognizer](/guides/ios/knowledge-base/adding-swipe-gesture-recognizer.md) - [Adding Vector Image Annotation From Instant Json](/guides/ios/knowledge-base/adding-vector-image-annotation-from-instant-json.md) - [Fix app store connect operation errors in Xcode](/guides/ios/knowledge-base/app-store-connect-operation-errors.md) - [Archive Errors Cocoapods](/guides/ios/knowledge-base/archive-errors-cocoapods.md) - [Configuring Scroll Views](/guides/ios/knowledge-base/configuring-scroll-views.md) - [Customize Share Sheet Apps](/guides/ios/knowledge-base/customize-share-sheet-apps.md) - 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