[vtkusers] getting the angle of rotation

[Anja Ende]

Hi everyone,

I have a problem that I wonder if someone can help me with.

I have an image and when I press the left button and drag the mouse, I want
to calculate the angle that the subsequent mouse positions describe from the
center of the image. So, given x1, y1 and x2, y2, can someone tell me how I
can calculate the angle between them...

Thanks and cheers,

Anja
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