Drawing a bitmap to a bitmap

[Nate Bross]

I am trying to to a manual Double Buffer in vb.net. I have several bitmap objects, and I would like to draw each of them onto a single bitmap object, then finally draw that to the form. There is a reason for my madness, I am developing for the PocketPC and I cannot get Me.SetStyle to work. I am kind of confused with the syntax of how to do that. If someone could give a small example drawing two seprate bitmap objects onto a third. C# code is okay, I can convert but Visual Basic would be more desirable. Thanks inadvance.

[thenerd]

Not sure for a pocket PC, but here's code for drawing a bunch of bitmaps to a bitmap and then drawing that bitmap to the form for a windows app.

 

dim formg as graphics
dim g as graphics
dim backbitmap as bitmap
dim bitmap1 as bitmap
dim bitmap 2 as bitmap

private sub form1_load(dfjkasdjf)dsfad

formg = me.creategraphics
backbitmap = new bitmap(form1.width,form1.height)
'^ Set the size of the bitmap
g = graphics.fromimage(backbitmap)
bitmap1 = new bitmap("C:\location\of\bitmap1.bmp")
bitmap 2 = new bitmap("C:\location\of\bitmap2.bmp")

end sub

private sub form1_paint(dfasdfasdf)dafsd 'or any other sub for that matter

g.drawimage(bitmap1,50,50) 'bitmap, x location, y location
g.drawimage(bitmap2,12,70)

formg.drawimage(backbitmap,0,0)

end sub

[Iceplug]

I use this method all of the time to draw my pictures:

I have discussed it (the method) here:

http://iceplug.vwebservices.com/cngdi3.htm

 

But, what you do is you have two bitmaps and a graphics object.

Bitmap backup;

Bitmap somepic;

Graphics gfx;

 

somepic = new Bitmap("filename.ext");

backup = new Bitmap(width, height);

gfx = Graphics.FromImage(backup);

 

To draw somepic to backup:

gfx.DrawImage(somepic, 0, 0);

:)

[Nate Bross]

I don't know if I should make a new thread or not, I doubt it. I was wondering is there a way to draw a bitmap transparently? IE. I have a bitmap with a black background and I want any black to show up transparently but the rest of my image to display at full opacity?

[thenerd]

bitmap1.maketransparent(color.black)

[Nate Bross]

Exactly what I was looking for. I was looking in the wrong place for that method. Issue Resolved.