Re: Shrink graphics area (GDI+ Graphics) - C / C++ / MFC Discussion Boards

Re: Which is the latest version of VC++ ???

Naveen3-Sep-07 21:58

3-Sep-07 21:58

The latest verion of vc++ currently available is with the visual studio 2005. Another version called "Orcas" is expected to release on 2008. It is now available as RC .

nave

[OpenedFileFinder]

Re: Which is the latest version of VC++ ???

Neo Andreson3-Sep-07 22:54

Neo Andreson

3-Sep-07 22:54

ThankXXX

There Is Nothing Right & Wrong

Shrink graphics area (GDI+ Graphics)

TheShihan3-Sep-07 21:25

TheShihan

3-Sep-07 21:25

Hi,

On my Dialog I've got a "picture control" element. It is assigned with a var "m_pictureControl" in the code.

I draw an image inside the border of the picture control with GDI+. The problem that occurs is, that the image overpaints the border of the picture control (only when zoomed, otherwise I can shrink it, so that it can fit inside).

I get the area where the image will be drawed like that:

CClientDC dc(&m_pictureControl);
Graphics graphics(dc);

So it will have the dimension of the picture control, but unfortunately with the borders. Is there a way to somehow shrink the "graphics" object/area?

Thx, Shi

Re: Shrink graphics area (GDI+ Graphics)

Llasus3-Sep-07 21:31

Llasus

3-Sep-07 21:31

Try StretchBlt.

Re: Shrink graphics area (GDI+ Graphics)

Naveen3-Sep-07 21:54

Naveen

3-Sep-07 21:54

you can use the Graphics::SetClip() function to clip the border.

What I mean is, get the client rect of the picture control. Deflate it by the width of the border( 1 or 2 pixel ), then apply this rect to SetClip() function.

nave

[OpenedFileFinder]

Re: Shrink graphics area (GDI+ Graphics)

TheShihan3-Sep-07 22:38

TheShihan

3-Sep-07 22:38

Hi, thanks for your answer.

I tried following (a Method that gives me back a Graphics object with whom I can work with for drawing the images into):

Graphics CmyDialog::GetGraphicsObj()
{

	CClientDC dc(&m_pictureControl);
	Graphics graphicObj(dc);

	CRect rc = GetImageArea(&m_pictureControl);
	
	CPoint topLeft;
	topLeft = rc.TopLeft();
	int rcWidth = rc.Width();
	int rcHeight = rc.Height();
	
	Rect gdiRect(topLeft.x, topLeft.y, rcWidth, rcHeight);

	graphicObj.SetClip(gdiRect, CombineModeUnion);

	return graphicObj;
}

It says it has an error at the return line:
error C2248: "Gdiplus::Graphics::Graphics": Kein Zugriff auf private Member, dessen Deklaration in der Gdiplus::Graphics-Klasse erfolgte.
( no access to private memember, see declaration in the Graphics-Class)

1) Is this a good way, how I try to clip the rectangle/graphics area?
2) why does this error pop up?

Thx for ur help, Shi

Re: Shrink graphics area (GDI+ Graphics)

Naveen3-Sep-07 22:54

Naveen

3-Sep-07 22:54

You cannot return a Graphics object.

BTW I dont understand whats the purpose of the above function

what I mean is to do as follows..

CClientDC dc(&m_pictureControl);	<br />
Graphics graphics(dc);<br />
CRect rc = GetImageArea(&m_pictureControl);<br />
re.DeflateRect(2,2);<br />
Rect gdiRect(topLeft.x, topLeft.y, rcWidth, rcHeight);	graphicObj.SetClip(gdiRect, CombineModeUnion);<br />
do your drawings here.

TheShihan wrote:
error C2248: "Gdiplus::Graphics::Graphics": Kein Zugriff auf private Member, dessen Deklaration in der Gdiplus::Graphics-Klasse erfolgte.
( no access to private memember, see declaration in the Graphics-Class)

Sorry I dont know the above language. Smile | :)

nave

[OpenedFileFinder]

Re: Shrink graphics area (GDI+ Graphics)

TheShihan3-Sep-07 23:45

TheShihan

3-Sep-07 23:45

well, I'm stuck... first I show my code:

/**************************************************************************************/
void xy::DrawPicture()
/**************************************************************************************/
{
	///////////////////////////////////////////////
	// show image in picture control IDC_PICTURE
	CClientDC dc(&m_pictureControl);
	Graphics graphics(dc);

	CRect rc = GetImageArea(&m_pictureControl);

	CPoint topLeft;
	topLeft = rc.TopLeft();
	int rcWidth = rc.Width();
	int rcHeight = rc.Height();
	
	Rect gdiRect(topLeft.x, topLeft.y, rcWidth, rcHeight);

	graphics.SetClip(gdiRect, CombineModeUnion);

	// fix image panning
	m_nPanX = 0;
	m_nPanY = 0;
	
	// Coordinates of the top left corner (in drawing area)
	int x = 0,
		y = 0;

	int size_x = rc.Width();
	int size_y = rc.Height();
		
	// Display it
	graphics.DrawImage(m_image, x, y, size_x, size_y);

	// we need to enable the image manipulation controls
	enableImageManipulation(true);

}

and to make things clearer (hopefully Wink | ;-)

/**************************************************************************************/
// Returns a CRect with deflated dimensions of a CWnd child element
CRect xy::GetImageArea(CWnd * windowElement)
/**************************************************************************************/
{
	CRect rc;

	windowElement->GetWindowRect(&rc);
	ScreenToClient(&rc);

	rc.DeflateRect(2, 2);

	return rc;
}

Sooo.. what I don't get or what it's not working is: I don't see any change at all with "CombineModeUnion". I have the "graphics" which is from the "dc", which has the dimensions of the picture control with borders. Then and I have the "rc" (a CRect) which has been deflated 2 pixel on each side.

So in my mind, when I take the UNION of the both "shapes" it should clip the "graphics" object and it should have the dimensions of the smaller "rc", also it should be positioned inside the picture control, spacing 2px on each side and not TOP: 0 LEFT: 0 (as it seems to me it is).

What am I doing wrong, any Ideas?

Thx, Shi

Re: Shrink graphics area (GDI+ Graphics)

Naveen3-Sep-07 23:51

Naveen

3-Sep-07 23:51

try using the CombineModeIntersect flag instead of CombineModeUnion

nave

[OpenedFileFinder]

printing problem on A4 size paper???

Neo Andreson3-Sep-07 21:25

Neo Andreson

3-Sep-07 21:25

Can anybody tell me how much area of A4 size paper
we can use for printing???
Is possible to use total area???
ThankXXX...

Re: printing problem on A4 size paper???

Llasus3-Sep-07 21:33

Llasus

3-Sep-07 21:33

Yes it is possible. You can print on the whole area by setting the margin size to 0. Is this regarding a C++ program you made? Otherwise, you may be on the wrong forum. Smile | :)

Re: printing problem on A4 size paper???

Nishad S3-Sep-07 22:08

Nishad S

3-Sep-07 22:08

I will say it is possible because I have seen doing so programatically. You can expect the maximum area that the printer can use. And one software that I have seen useful for doing so is CorelDRAW.

- NS -

Re: printing problem on A4 size paper???

Anurag Gandhi3-Sep-07 22:44

Anurag Gandhi

3-Sep-07 22:44

A4 size paper has size: 210x297 mm.
Yes, You can use total area or whatever area you want for printing.

Anurag Gandhi.
http://www.softgandhi.co.nr
Life is a computer program and every one is the programmer of his own life.

Compression

shakumar_223-Sep-07 20:46

shakumar_22

3-Sep-07 20:46

Hi
In my programme ,it was an Socket Programme ,datas was sending through socket and Receiving through Socket. Datas are sending as (char*)and receiving as (char*) only.

I want to know wheather i can compress the data before sending and Decompression data after receving with the Vc++ 8.0 code(with out using dll any other third party tools)

I want to done through the code.

So give your suggestion about this.

Regards
shakumar

shakumar

Re: Compression

Llasus3-Sep-07 20:55

Llasus

3-Sep-07 20:55

yes it can be done. what data are you gonna compress though? will it be an image or just text data? here is a link explaining some of data compression algorithms:
http://en.wikipedia.org/wiki/Compression_algorithms

Re: Compression

shakumar_223-Sep-07 21:04

shakumar_22

3-Sep-07 21:04

Both
Image and Text Data

shakumar

Re: Compression

Paresh Chitte3-Sep-07 21:49

Paresh Chitte

3-Sep-07 21:49

For Image data compression, please have a look at http://www.faqs.org/faqs/jpeg-faq/part2/section-15.html[^].

Regards,
Paresh.

Re: Compression

Paresh Chitte3-Sep-07 21:00

Paresh Chitte

3-Sep-07 21:00

Refer,
http://en.wikipedia.org/wiki/Data_compression[^]
http://www.faqs.org/faqs/jpeg-faq/part2/section-15.html[^]
http://www.ccs.neu.edu/groups/honors-program/freshsem/19951996/jnl22/jeff.html[^]
http://marknelson.us/1989/10/01/lzw-data-compression/[^]

Regards,
Paresh.

Re: Compression

Maxwell Chen3-Sep-07 22:02

Maxwell Chen

3-Sep-07 22:02

TCP/IP compression[^].

Maxwell Chen

Re: Compression

jhwurmbach3-Sep-07 22:14

jhwurmbach

3-Sep-07 22:14

shakumar_22 wrote:
I want to know wheather i can compress the data before sending and Decompression data after receving

For this, you can use the zLib. It uses the zip/gzip compression format and can be added to your project as a simple DLL offering several routines.

Though I speak with the tongues of men and of angels, and have not money, I am become as a sounding brass, or a tinkling cymbal.
George Orwell, "Keep the Aspidistra Flying", Opening words

Re: Compression

El Corazon4-Sep-07 16:11

El Corazon

4-Sep-07 16:11

shakumar_22 wrote:
(with out using dll any other third party tools)

I want to done through the code.

So give your suggestion about this.

http://books.google.com/books?id=--MbAAAACAAJ&dq=data+compression+book[^]

seems a harsh requirement... I would recommend using a 3rd party tool, but if you want to understand how compression works, or put it all in code yourself, buy the book.

_________________________
Asu no koto o ieba, tenjo de nezumi ga warau.
Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb)

How to Put Icon on Button.

GauranG Shah3-Sep-07 20:11

GauranG Shah

3-Sep-07 20:11

I am Using Win32 Appplication. Can anybody tell me how to put the Icon on Button.

Re: How to Put Icon on Button.

Stephen Hewitt3-Sep-07 21:03

Stephen Hewitt

3-Sep-07 21:03

Check out the BM_SETIMAGE[^] message.

Steve

Re: How to Put Icon on Button. [modified]

GauranG Shah4-Sep-07 0:41

GauranG Shah

4-Sep-07 0:41

Hi. Thank u for reply. I tried following code.It dont give me any compile or Run time Error but it isn't showing any Image on the Button. I dont know where m I wrong. Sniff | :^)

case WM_INITDIALOG:<br />
   hIcon = LoadIcon(hInst,(LPCWSTR)IDI_ICON1);<br />
   hStart = GetDlgItem(hWndDlg,IDC_Start);<br />
   LRESULT lr = SendMessage(hStart,BM_SETIMAGE,(WPARAM)IMAGE_ICON,(LPARAM)hIcon);<br />
   if(lr != NULL)<br />
           {<br />
              OutputDebugString(L"Error");<br />
            }<br />
<br />
break;<br />

Re: How to Put Icon on Button.

Hamid_RT4-Sep-07 1:54

Hamid_RT

4-Sep-07 1:54

Did you set SS_ICON for button?

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.