# Rotate an ink annotation

## Q: How can I rotate an ink annotation?

A: Ink signatures have no rotation concept in the PDF spec, so there is no `rotation` property on `PSPDFKit.Annotations#InkAnnotation`.

However, you can still perform a rotation by mapping and rotating the annotation points individually and adjusting the bounding box if needed:

This example provides a function that can rotate an ink annotation from the center of its bounding box using square angles (`90`, `180` and `270` degrees):

 ```1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 ``` ```function rotateInkAnnotation(annotation, degrees) { // Get annotation geometric center const annotationCenter = new PSPDFKit.Geometry.Point({ x: annotation.boundingBox.left + annotation.boundingBox.width / 2, y: annotation.boundingBox.top + annotation.boundingBox.height / 2 }); let rotatedAnnotation = annotation.update("lines", lines => lines.map(line => line.map(point => // Rotate each annotation point point .translate(annotationCenter.scale(-1)) .rotate(degrees) .translate(annotationCenter) ) ) ); // For 90 and 270 degrees, the bounding box needs to be rotated too if (degrees === 90 || degrees === 270) { rotatedAnnotation = rotatedAnnotation.set( "boundingBox", new PSPDFKit.Geometry.Rect({ left: annotationCenter.x - annotation.boundingBox.height / 2, top: annotationCenter.y - annotation.boundingBox.width / 2, width: annotation.boundingBox.height, height: annotation.boundingBox.width }) ); } return rotatedAnnotation; } // Rotate annotation by 90 degrees and update it: instance.update(rotateInkAnnotation(inkAnnotation, 90)); ```

This has been tested with PSPDFKit for Web 2020.5.0.