Bitmap rotation affect other widgets on the screen

[samavr]

Hi,

When I rotate a bitmap, basically using the below methods or using translate, around its center or corner

GD.cmd_rotate(a);

GD.cmd_setmatrix();
It affects other standard widgets on the screen also, that are not close to the bitmap at all to get affected. I just tested this by showing a small 100*100 image. I just placed one button at another corner of the screen, far from the bitmap.

However, what happens is that the rotation of the bitmap wipes off the text of the button

Why?!

The only solution I found was using

GD.SaveContext();
before rotation, and using

GD.RestoreContext();

after bitmap rotation, before I show the button

[jamesbowman]

Yes, the rotation is part of graphics state, like color etc. So after GD.cmd_setmatrix() everything drawn afterwards is rotated.

Using SaveContext() / RestoreContext() is the correct way to handle this - it preserves and restores all the graphics state.