ROTATITION image?

[nhandt3]

Hi,

Can uGFX rotate an image with specific angle? I dont see the API in documents. Please help!

Thanks,

Nhan 

[Joel Bodenmann]

Hello @nhandt3 and welcome to the µGFX community!

Unfortunately, the current version of the µGFX library doesn't offer any high-level API for that.

[nhandt3]

hi Joel,

Thanks for your quick reply, I see the API about matrix rotation. If I put my bitmap image to a matrix then rotate it, it's posible?

Nhan

[inmarket]

You would need to decode your image into a pixmap. That would then give you the image in memory non-rotated.

You could then build a rotation matrix and then point by point transfer the image to the display passing each x, y coordinate through your rotation matrix to get the destination x,y coordinate. 

[Joel Bodenmann]

6 hours ago, inmarket said:

You would need to decode your image into a pixmap. That would then give you the image in memory non-rotated.

To clarify: This is fairly easy as it's just two high-level API calls: gdispPixmapCreate() to create a valid GDisplay object and then pass that GDisplay* pointer as the first argument to your gdispGImageDraw() function. That's how you draw the image into the pixmap.