Angle offsets and positive/negative angles

I've been stuck with rotating an asset with an offset.

Sstart = e.GetPosition(dial);                    if (dial.IsStylusCaptured)          {                             AngleRot = Math.Atan2((Y - Sstart.Y) , (X - Sstart.X));              radAngle = AngleRot / Math.PI * 180 + 180;              radAngle = radAngle - AthetaD;              di.RenderTransform = new RotateTransform(radAngle + 90);                               }    

Using this I was able to rotate my object from 0° with an offset of x to angle theta. But when I make a second rotation, instead of it rotating from angle theta with an offset x it resets the object back to 0°. How can I make it so the offset is always from theta and not 0°?

https://stackoverflow.com/questions/67249390/angle-offsets-and-positive-negative-angles April 25, 2021 at 11:06AM