Re: Can GDI+ do this? - Graphics Discussion Boards

Re: Can GDI+ do this?

transoft2-Aug-09 4:06

transoft

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?

Re: Can GDI+ do this?

Luc Pattyn31-Jul-09 18:53

Luc Pattyn

31-Jul-09 18:53

Yes. Read up on the following:

Bitmap.CreateGraphics
Graphics.RotateTransform
Graphics.DrawImage

Smile | :)

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Re: Can GDI+ do this?

transoft1-Aug-09 2:15

transoft

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,

Re: Can GDI+ do this?

Luc Pattyn1-Aug-09 6:54

Luc Pattyn

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.

Smile | :)

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Re: Can GDI+ do this?

transoft2-Aug-09 4:03

transoft

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?

Re: Can GDI+ do this?

Luc Pattyn2-Aug-09 4:14

Luc Pattyn

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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Re: Can GDI+ do this?

transoft2-Aug-09 5:17

transoft

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

Re: Can GDI+ do this?

Luc Pattyn2-Aug-09 5:24

Luc Pattyn

2-Aug-09 5:24

transoft wrote:
it will create a copy the Bitmap

I doubt that verrrrrrrrrrry much.

Smile | :)

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Problem with image dimensions being reversed

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

Luc Pattyn

31-Jul-09 18:56

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

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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

Luc Pattyn

18-Jul-09 0:03

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

Smile | :)

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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.

How to print GDI BarChart?

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

Re: How to print GDI BarChart?

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!

Re: How to print GDI BarChart?

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.

Re: How to print GDI BarChart?

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.

Re: How to print GDI BarChart?

RanaSohail6-Sep-09 21:47

RanaSohail

6-Sep-09 21:47

Thank You very much sir...! Smile | :)

Great OpenGL 3.1 tutorial

Gvizbi10-Jul-09 9:36

Gvizbi

10-Jul-09 9:36

I found this OpenGL 3.1 tutorial on Wikiscripts, this is the first part, but author promised that soon there will be a sequel:

Re: Great OpenGL 3.1 tutorial

Gvizbi15-Jul-09 8:43

Gvizbi

15-Jul-09 8:43

Source is now available to download!

How to move selected objects in OPENGL

gourishsio6-Jul-09 19:15

gourishsio

6-Jul-09 19:15

Hi,
I am trying to develop a CAD like application using OpenGL and wxWidgets... I have reached at a stage where i can draw a circle, square, load an image, polygon etc.. am also able to zoom and pan..

as a further step, i want to move object, scale it and rotate.. to do this i have written a code to select and pick object that lies under mouse pointer.. Now what do i have to do to move the picked object..?? I tried by finding the difference of old and new points and recalculating the points of the object..

C.x += dx;
C.y += dy;

where dx and dy are differences of old and new x, and y values resp.. And C.x C.y are original x and y coordinates

This is showing some movement. but not as desired.. it isnt moving along with the mouse movement.. For a small mouse movement, it shows a huge displacement and also very fast... so what can be done to make a selected object move along wiith the mouse pointer...??

Also i'm not able to zoom with reference to the mouse pointer.. it zooms with reference to the origin (0,0,0) only.. please help me..

Thanks in advance..

Can I push a per-pixel off-screen bitmap operation onto the Graphics Accelerator (DirectDraw, etc.)?

roscler4-Jul-09 20:04

roscler

4-Jul-09 20:04

I have a program running on Windows 2000 or better PC's that needs to do a per-pixel operation on a Windows bitmap. Currently I'm using a tight loop that does little more than a pointer increment followed by a quick add operation on each pixel over the entire bitmap. This is done in real-time so I need it fast. On a 320 x 240 image that ends up being 230,400 addition operations since they are RGB bitmaps (320 x 240 x 3). This is being done in real time on an image stream that is pumping out 25 frames per second. At that resolution it's fast enough, but at 640 x 480 I have to start dropping frames significantly to keep up. I am not displaying the modified bitmap to the screen at any time. Instead I am shipping it off to a remote location over the Internet for display at the destination system.

I was wondering if I could push this operation to the Graphics Accelerator using one of Windows Graphics API's like DirectDraw, etc.? Or do PC Graphic accelerators only help with operations that are drawn to the screen (local PC video memory)? I assume that if it's possible I'd need to pump the bitmap to the Graphics Accelerator and then know how to do a global operation on each pixel and then copy it back to local RAM? If it is possible to use the Graphics Accelerator to help with per-pixel operations on a off-screen bitmap, what are the pros and cons?

Finally, is there a way to push JPEG decompression and compression operations onto the Graphics Accelerator?

If it is possible to do these things I would like to know where a quick easy to dive into sample is. I don't have any need for shading or rotations or any complex graphics operations at all like that. Therefore I would like to avoid wading through a ton of reading just to learn how to do a simple global pixel operation task.

Thanks in advance.

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