Graphics

30-Jul-09 9:31

Hi,

I want to scale and rotate a bitmap (loaded using GDI+) and save the rotated and scaled bitmap to a file using GDI+.

How can I do it?

Thanks,

modified on Friday, July 31, 2009 5:09 PM

Tim Craig31-Jul-09 18:30

Tim Craig

31-Jul-09 18:30

Did you read the GDI+ documentation on bitmaps?

You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists.

transoft2-Aug-09 4:06

2-Aug-09 4:06

Did you really understand GDI+? I read GDI+ several days and try to use following code:

Graphics g(hdc);
Image i(L"HelloWorld.bmp");
g.DrawImage(&amp;i,0,1024);
g.TranslateTransform(100.0f, 50.0f);
g.RotateTransform(45.0f);
g.DrawImage(ℑ,0,0);
CLSID jpgClsid;
GetEncoderClsid(L"image/jpeg", &amp;jpgClsid);
i.Save(pIStream1, &amp;jpgClsid);

I had no luck. Did you save a scaled or rotated bitmap using GDI+ before?

Luc Pattyn31-Jul-09 18:53

31-Jul-09 18:53

Yes. Read up on the following:

Bitmap.CreateGraphics
Graphics.RotateTransform
Graphics.DrawImage

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transoft1-Aug-09 2:15

1-Aug-09 2:15

Thank you very much for reply.

I want to save the rotated Image to a file.

"Graphics.DrawImage" can not save to a file?

Right? Can I get bitmap from rotated "Graphics"?

Best regards,

Luc Pattyn1-Aug-09 6:54

1-Aug-09 6:54

I gave you all the pointers you need, and you need all I gave you.
Do some reading and use your brain, I'm not going to hold your hand.

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transoft2-Aug-09 4:03

2-Aug-09 4:03

I did not find following function call for the Bitmap class.

Bitmap.CreateGraphics

I tried following:

Graphics g(hdc);
Image i(L"HelloWorld.bmp");
g.DrawImage(&amp;i,0,1024);
g.TranslateTransform(100.0f, 50.0f);
g.RotateTransform(45.0f);
g.DrawImage(ℑ,0,0);
CLSID jpgClsid;
GetEncoderClsid(L"image/jpeg", &amp;jpgClsid);
i.Save(pIStream1, &amp;jpgClsid);

I had no luck.
Any ideas? Did you try to save a rotated or scaled Bitmap before?

Luc Pattyn2-Aug-09 4:14

2-Aug-09 4:14

Sorry, my mistake, it is Graphics.FromImage I was thinking of.

transoft wrote:
I had no luck.

That is uninformative and unscientific. Doesn't provide a single clue. Read my sig.

transoft wrote:
Did you try to save a rotated or scaled Bitmap before?

Yes. I've done many things with images in .NET

However your latest code makes me doubt it is .NET code you want; what's all that hdc and CLSID stuff, I wouldn't need that to solve your original problem.

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transoft2-Aug-09 5:17

2-Aug-09 5:17

Hi
I am using C++ native. I did not using .NET.

It looks like to me that Graphics object would not affect the Bitmap object. I am guessing that before Graphics Object does anything, it will create a copy the Bitmap object and then does bitmap transformation to the copy, and finally delete the Bitmap copy. The original Bitmap did not change.

Thanks

Luc Pattyn2-Aug-09 5:24

Problem with image dimensions being reversed

2-Aug-09 5:24

transoft wrote:
it will create a copy the Bitmap

I doubt that verrrrrrrrrrry much.

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Alan Burkhart29-Jul-09 9:38

Alan Burkhart

29-Jul-09 9:38

I've built a utility that grabs the frames from a multi-frame .tif or gif so I can save them to individual files. In one file (a tif fax document) the dimensions are reversed - 11 x 8.5 instead of 8.5 by 11. Text orientation is correct, but not the dimensions.

I assume the problem is on my end because when I open the file in Irfanview it displays correctly. None of the other TIFs I'm testing with are fax documents, and they display correctly. Worth noting that both Paint.net and MS Paint have the same problem I'm having.

Anyone have an idea as to the root of the problem?

repost

Luc Pattyn31-Jul-09 18:56

http://www.codeproject.com/Messages/3140205/Problem-with-image-dimensions-being-reversed.aspx[^]

31-Jul-09 18:56

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jawbreaker in c++

sajede27-Jul-09 18:14

sajede

27-Jul-09 18:14

hi, please help me to wrtie code project of jawbreaker game in c++.

Re: jawbreaker in c++

Tim Craig27-Jul-09 18:34

Tim Craig

27-Jul-09 18:34

Why?

You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists.

Re: jawbreaker in c++

Henry Minute2-Aug-09 9:26

Henry Minute

2-Aug-09 9:26

Please deposit $15,000 in my account and I'll get started.

Oh, and by the way I can only do it in my spare time.

Henry Minute

Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”

RGB to Hsv ?

Mohammad Dayyan17-Jul-09 20:50

Mohammad Dayyan

17-Jul-09 20:50

Hi.
How can we convert a RGB code to its equivalent in Hsv ?

Thanks.

Re: RGB to Hsv ?

Luc Pattyn18-Jul-09 0:03

How to print GDI BarChart?

18-Jul-09 0:03

by using some code, that can be found in a CP article; search for RGB HSV

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Re: RGB to Hsv ?

Tim Craig18-Jul-09 21:13

Tim Craig

18-Jul-09 21:13

Or by doing a simple web search? That's how I found out how to do it.

You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists.

RanaSohail16-Jul-09 18:40

RanaSohail

16-Jul-09 18:40

Hello!
I have implemented a barchart on the surface of Windows-Form. how to print it into hard copy.

regard,
Sohail

Henry Minute2-Aug-09 9:33

Henry Minute

2-Aug-09 9:33

Assuming that you are using .NET, and you don't say!!!

All Control descendants have a DrawToBitmap method. Use that, then all you have to do is work out how to print a Bitmap.

Seriously, there are thousands of examples of how to do this, both here on CP and on t'web. Do a little Binging!

RanaSohail5-Aug-09 3:51

RanaSohail

5-Aug-09 3:51

Hi!
i m using .Net and have drawn a chart on windows form's client rectangle. i wanna print it.
Thanks alot sir Henry.

Henry Minute5-Aug-09 4:34

Henry Minute

5-Aug-09 4:34

Then I suggest that you do as I said in the my last post. Look up the documentation for Form.DrawToBitmap, read it and experiment.
After that try Googling, or Binging for c# print bitmap

You might also want to consider filling your Forms client area with a Panel and drawing your bar chart on that, then use Panel.DrawToBitmap instead of the Form version.