How to fix annoying Bug with Rotated ROI in LabVIEW NXG

LabVIEW

Annoying issue in LabVIEW NXG/Vision with Rotated ROI: When an ROI is rotated and the image is subsequently zoomed in/out by the user, the anchors remain unrotated. They only update after moving or resizing the ROI. Here’s how to fix it

LabVIEW NXG 5.1.0; Build 8.4.0.49575.

Vision Development Module 2025 Q2.

Code:

image-20250418093426591

And the issue:

To get this fixed you can use dnSpy software (and the fact that LabVIEW NXG including Vision based on .net, and the code was not obfuscated much).

All what you need to modify this file a little bit:

C:\Program Files\National Instruments

\LabVIEW NXG 5.0\Addons\NI\Vision\Core-src\20.6.0\NationalInstruments.VisionCommon.Display.Controls.dll

\Shared\LabVIEW NXG Run-Time\5.0\NationalInstruments.VisionCommon.Display.Controls.dll

On Zoom Level Change the following happened:

image-20250418090648166

You have to change this Method:

image-20250418091839188

All what you need is to add 4 lines code

			position = ROICalculations.RotatePoint(position, point, rotatedRectangleROI.RotationAngle);
			position2 = ROICalculations.RotatePoint(position2, point, rotatedRectangleROI.RotationAngle);
			position3 = ROICalculations.RotatePoint(position3, point, rotatedRectangleROI.RotationAngle);
			position4 = ROICalculations.RotatePoint(position4, point, rotatedRectangleROI.RotationAngle);

right here:

image-20250418091234189

After compiling and saving (ensure write permissions in the Program Files folder):

Used Tool - dnSpy 6.1.8.

ILSpy is also useful, but I wasn’t able to get functional assembly after rebuild.