GUI_MEMDEV_Rotate abnormal with alpha picture

[angusshi]

We want to develop analog clock on LPC54608. But when we rotate alpha needle picture by GUI_MEMDEV_Rotate API , it can't display anything. When we modified the alpha value to non zero(not 0x00 or 0xFF) in picture GUI_BITMAP data array, It can be displayed, but with shadows, How can we rotate a alpha needle picture?

[soledad]

Hello,

You need to considerer that when you rotate, the image would not be fixed in the screen that you setup, try to flip the image, to see if you are still having the issue, then you should considerer the  RAM that you are allocating

Another thing to review it is to considerer the version of emWIN and  MCUExpresso, since not all are supported for all the devices.