How to rotate an ImageView

[Toon]

What is the easiest way to rotate an Imageview using code (without using any non-default libraries) ? Thanks for reading!

 

[Djembefola]

What is the easiest way to rotate an Imageview using code (without using any non-default libraries) ?

Sub RotateView(v As View, bmp As Bitmap, degrees As Float)
    Dim c As Canvas
   Dim r As Rect
   c.Initialize(v)
   r.Initialize(0,0,v.Width,v.Height)
   c.DrawRect(r,Colors.transparent,True,0)
   c.DrawBitmapRotated(bmp,Null,r,degrees)
   v.Invalidate
End Sub

 

[hookshy]

:sign0098: I counl't not understand bitmaprotated until i found thin exemple.
Thanks

 

[sorex]

Interesting piece of code

but

I end up with a 45 degrees rotated image where the corners are cut off since they end up outside the imageview's boundaries ?
(the image size grows due to the rotation)

I guess it needs to be rotated, scaled, recentered and then drawn to the canvas ?

 

[Mark Read]

Easier is with the RSImageProcessing Library

Sub ShowImage(bmp As Bitmap)
If bmp.width>bmp.height Then            'Image is landscape, rotate
      Dim rbmp As RSImageProcessing
      mBmp=rbmp.rotateBitmap(bmp, -90)

end if

.....rest of code

 

[sorex]

I sorted it out.

my view was square and the loaded image rectangular.

having the source image smaller than the destination view helps

I just added 1 line to the sub code to clean the mess when doing several rotations in a row. (it left trails as it didn't erase the destination bitmap/canvas)

 

[DarkAngel]

Hello,

How can i rotate a BitmapDrawable?
Or converte from bitmapdrawable do bitmap to make the rotation and convert back do bitmapdrawable?
Is it possible?

 

[Erel]

BitmapDrawable.Bitmap returns the bitmap.

 

[DarkAngel]

Thank's Erel, problem solved.