Making Bitmaps and Graphics objects - two ways

[**Developer**]

Stumbling through I find both of the following appear to work the same.

I'm guessing there is a difference that I'm just not aware of.

Can someone enlighten me?



Thanks





'This works (4 lines)

Dim TmpBitmapGraphi cs As Graphics = PictureBoxPic.C reateGraphics

Dim TmpBitmap As New Drawing.Bitmap( PictureBoxPic.C lientSize.Width ,
PictureBoxPic.C lientSize.Heigh t, TmpBitmapGraphi cs)

TmpBitmapGraphi cs.Dispose() 'Did the above to preserver the PixelFormat

TmpBitmapGraphi cs = Graphics.FromIm age(TmpBitmap)

'This also works (2 lines)

Dim TmpBitmap As New Drawing.Bitmap( PictureBoxPic.C lientSize.Width ,
PictureBoxPic.C lientSize.Heigh t)

Dim TmpBitmapGraphi cs As Graphics = Graphics.FromIm age(TmpBitmap)

[I Don't Like Spam]

Re: Making Bitmaps and Graphics objects - two ways

**Developer** wrote:[color=blue]
> Stumbling through I find both of the following appear to work the same.
>
> I'm guessing there is a difference that I'm just not aware of.
>
> Can someone enlighten me?
>
>
>
> Thanks
>
>
>
>
>
> 'This works (4 lines)
>
> Dim TmpBitmapGraphi cs As Graphics = PictureBoxPic.C reateGraphics
>
> Dim TmpBitmap As New Drawing.Bitmap( PictureBoxPic.C lientSize.Width ,
> PictureBoxPic.C lientSize.Heigh t, TmpBitmapGraphi cs)
>
> TmpBitmapGraphi cs.Dispose() 'Did the above to preserver the PixelFormat
>
> TmpBitmapGraphi cs = Graphics.FromIm age(TmpBitmap)
>
> 'This also works (2 lines)
>
> Dim TmpBitmap As New Drawing.Bitmap( PictureBoxPic.C lientSize.Width ,
> PictureBoxPic.C lientSize.Heigh t)
>
> Dim TmpBitmapGraphi cs As Graphics = Graphics.FromIm age(TmpBitmap)
>
>[/color]

'Set it to the picture boxes graphics object
1. Dim TmpBitmapGraphi cs As Graphics = PictureBoxPic.C reateGraphics

2. Dim TmpBitmap As New Drawing.Bitmap( PictureBoxPic.C lientSize.Width ,
PictureBoxPic.C lientSize.Heigh t, TmpBitmapGraphi cs)

'Kill this object (this has the same effect as if you never did line 1
3. TmpBitmapGraphi cs.Dispose() 'Did the above to preserver the PixelFormat

' Set the object to something totally new.
4. TmpBitmapGraphi cs = Graphics.FromIm age(TmpBitmap)

So it seems like this way of doing it is pretty pointless, since you
create the object and then just kill it right after.

[**Developer**]

Re: Making Bitmaps and Graphics objects - two ways

..[color=blue]
>
> 'Set it to the picture boxes graphics object
> 1. Dim TmpBitmapGraphi cs As Graphics = PictureBoxPic.C reateGraphics
>
> 2. Dim TmpBitmap As New Drawing.Bitmap( PictureBoxPic.C lientSize.Width ,
> PictureBoxPic.C lientSize.Heigh t, TmpBitmapGraphi cs)
>
> 'Kill this object (this has the same effect as if you never did line 1[/color]

Except Line 2 used it. Not sure about the effect though. Can an image in a
picturebox have different DPI? Or does it match the screen?

[color=blue]
> 3. TmpBitmapGraphi cs.Dispose() 'Did the above to preserver the PixelFormat
>
> ' Set the object to something totally new.
> 4. TmpBitmapGraphi cs = Graphics.FromIm age(TmpBitmap)
>
> So it seems like this way of doing it is pretty pointless, since you
> create the object and then just kill it right after.[/color]