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Images generation

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This message was discovered on ASPFriends.com 'ngfx-drawing' list.
Responses highlighted in red are from those people who are likely to be able to contribute good, authoratitive information to this discussion. They include Microsoft employees, MVP's and others who IMHO contribute well to these kinds of discussions.

Shan Nunez, Eduardo

    Hi there.

        Following the late questions about creating images on the
fly, I've come up with this thing.

        I wanted to create bitmaps from scratch and manipulate them
without loading them from file;
    Chris trick of creating a graphics directly from a bitmap,

        dim b as New system.drawing.bitmap(w, h,
pixelformat.Format16bppRgb555)
        dim g as graphics = graphics.fromimage(b)
    doesn't work in C#. Instead, I use the following workaround,

            System.Drawing.Bitmap bitmap= new
System.Drawing.Bitmap(32, 16);
            System.IntPtr hBitmap = bitmap.GetHbitmap();
            System.Drawing.Image img =
System.Drawing.Image.FromHbitmap(hBitmap);
            System.Drawing.Graphics graphics =
Graphics.FromImage(img);

        Does anybody know if there is a better way to do it?


Thanks in advance,

Ed.

Reply to this message...

Jeffrey Widmer

Ed,
You might want to join aspngcs (c-sharp list)
http://www.asplists.com/asplists/aspngcs.asp
and post the vb.net code and ask for the c# translation. There's a lot of
people on that list who are excellent at translating from vb.net to c#.
-Jeff

-----Original Message-----
From: Shan Nunez, Eduardo [mailto:Click here to reveal e-mail address]
Sent: Thursday, January 24, 2002 6:47 AM
To: ngfx-drawing
Subject: [ngfx-drawing] Images generation

    Hi there.

        Following the late questions about creating images on the
fly, I've come up with this thing.

        I wanted to create bitmaps from scratch and manipulate them
without loading them from file;
    Chris trick of creating a graphics directly from a bitmap,

        dim b as New system.drawing.bitmap(w, h,
pixelformat.Format16bppRgb555)
        dim g as graphics = graphics.fromimage(b)
    doesn't work in C#. Instead, I use the following workaround,

            System.Drawing.Bitmap bitmap= new
System.Drawing.Bitmap(32, 16);
            System.IntPtr hBitmap = bitmap.GetHbitmap();
            System.Drawing.Image img =
System.Drawing.Image.FromHbitmap(hBitmap);
            System.Drawing.Graphics graphics =
Graphics.FromImage(img);

        Does anybody know if there is a better way to do it?

Thanks in advance,

Ed.

| [ngfx-drawing] member Click here to reveal e-mail address = YOUR ID
| http://www.aspfriends.com/aspfriends/ngfx-drawing.asp = JOIN/QUIT

Reply to this message...

Ryan Trudelle-Schwarz (VIP)

Yes, this is very possible:

Bitmap myBitmap = new Bitmap(32,16);
Graphics myGraphics = Graphics.FromImage(myBitmap);

Works fine in c#

You can also define the format if you wish when creating the Bitmap.

Hth, Ryan

-----Original Message-----
From: Shan Nunez, Eduardo [mailto:Click here to reveal e-mail address]

    Hi there.

        Following the late questions about creating images on
the
fly, I've come up with this thing.

        I wanted to create bitmaps from scratch and manipulate
them
without loading them from file;
    Chris trick of creating a graphics directly from a bitmap,

        dim b as New system.drawing.bitmap(w, h,
pixelformat.Format16bppRgb555)
        dim g as graphics = graphics.fromimage(b)
    doesn't work in C#. Instead, I use the following workaround,

            System.Drawing.Bitmap bitmap= new
System.Drawing.Bitmap(32, 16);
            System.IntPtr hBitmap = bitmap.GetHbitmap();
            System.Drawing.Image img =
System.Drawing.Image.FromHbitmap(hBitmap);
            System.Drawing.Graphics graphics =
Graphics.FromImage(img);

        Does anybody know if there is a better way to do it?


Thanks in advance,

Ed.

Reply to this message...

Shan Nunez, Eduardo

OK, that's just what I tried at first,
but as it didn't (and still doesn't) work in my VS .NET
(I get an 'Out of memory' exception in run time),
I had put the hbitmap in between. Maybe it has something
to do with the beta 2 I'm using.

                Thanks,

                        Ed.

-----Original Message-----
From: Ryan Trudelle-Schwarz [mailto:Click here to reveal e-mail address]
Sent: jueves, 24 de enero de 2002 20:49
To: ngfx-drawing
Subject: [ngfx-drawing] RE: Images generation

Yes, this is very possible:

Bitmap myBitmap = new Bitmap(32,16);
Graphics myGraphics = Graphics.FromImage(myBitmap);

Works fine in c#

You can also define the format if you wish when creating the Bitmap.

Hth, Ryan

-----Original Message-----
From: Shan Nunez, Eduardo [mailto:Click here to reveal e-mail address]

    Hi there.

        Following the late questions about creating images on
the
fly, I've come up with this thing.

        I wanted to create bitmaps from scratch and manipulate
them
without loading them from file;
    Chris trick of creating a graphics directly from a bitmap,

        dim b as New system.drawing.bitmap(w, h,
pixelformat.Format16bppRgb555)
        dim g as graphics = graphics.fromimage(b)
    doesn't work in C#. Instead, I use the following workaround,

            System.Drawing.Bitmap bitmap= new
System.Drawing.Bitmap(32, 16);
            System.IntPtr hBitmap = bitmap.GetHbitmap();
            System.Drawing.Image img =
System.Drawing.Image.FromHbitmap(hBitmap);
            System.Drawing.Graphics graphics =
Graphics.FromImage(img);

        Does anybody know if there is a better way to do it?


Thanks in advance,

Ed.

| [ngfx-drawing] member Click here to reveal e-mail address = YOUR ID
| http://www.aspfriends.com/aspfriends/ngfx-drawing.asp = JOIN/QUIT

Reply to this message...

Ryan Trudelle-Schwarz (VIP)

Send the code you are using, I'll test it here. The below was almost
directly copied from something I'm currently using (b2) and is working
fine.

-----Original Message-----
From: Shan Nunez, Eduardo [mailto:Click here to reveal e-mail address]

OK, that's just what I tried at first,
but as it didn't (and still doesn't) work in my VS .NET
(I get an 'Out of memory' exception in run time),
I had put the hbitmap in between. Maybe it has something
to do with the beta 2 I'm using.

Thanks,

Ed.

-----Original Message-----
From: Ryan Trudelle-Schwarz [mailto:Click here to reveal e-mail address]

Yes, this is very possible:

Bitmap myBitmap = new Bitmap(32,16);
Graphics myGraphics = Graphics.FromImage(myBitmap);

Works fine in c#

You can also define the format if you wish when creating the Bitmap.

Hth, Ryan

Reply to this message...

	System.Drawing.Bitmap
	System.Drawing.Graphics
	System.Drawing.Image
	System.IntPtr

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