iOS Question Panel Rotation and Left and Top position

[Alexander Stolte]

I am having a problem positioning a panel correctly with a 60 degree rotation.
There is certainly a formula for this, but I can't find it.

That is my starting position:

now i want to rotate the white panel by 60 degrees, the white panel should be with the left corners at the red panel. I have absolutely no idea which formula I need for this...

If i rotate with 60 degrees then it looks like:

 

[angel_]

Try this:

    xpnl_Line.Rotation = -60
    
    xpnl_Line.Top = xpnl_Line.Top - SinD(60) * xpnl_Line.Width / 2 + SinD(90 - 60) * xpnl_Line.Height / 2
    xpnl_Line.Left = xpnl_Line.Left - CosD(60) * xpnl_Line.Width / 2 - CosD(90 - 60) * xpnl_Line.Height / 2

 

[Alexander Stolte]

I should have created the question much earlier. I lost 3 hours because of it...

Thanks a lot you genius!