Question

Transparent rectangle drawn on top of lines MFC on Windows CE 5.0

Asked by: Anthony2000

I would like to draw a transparent color filled rectangle on some static lines. The width of this rectangle changes in real time. How do I accomplish this? The background color is white.

Thank you in advance.

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Asked On
2009-07-02 at 11:34:41ID24540539
Tags

mfc transparency gdi windows ce 5.0

Topics

Windows MobileProgramming

,

Windows Mobile (Pocket PC / Win CE) Operating Systems

,

Windows MFC Programming

Participating Experts
1
Points
500
Comments
11

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Answers

 

by: alexey_gusevPosted on 2009-07-02 at 11:43:20ID: 24766330

do you mean like DrawFocusRect() or DrawEdge() Win32 API?

otherwise there is Rectangle() function which uses current pen to draw the frame and current brush to fill it.

moreover, you can SetBkMode() to transparent

 

by: Anthony2000Posted on 2009-07-02 at 11:47:29ID: 24766361

What I need is a snippet of code, can you supply one? Here is what I have tried:

	brushFill.DeleteObject();
	brushFill.CreateSolidBrush(m_colorNeedle) ;
 
	pDC->SetBkMode(TRANSPARENT);
	pBrushOld = pDC->SelectObject(&brushFill) ;
 
	// draw the rectangle
	pDC->Polygon(m_pointRectangle, 5) ;
 
	// restore the brush (but keep the pen!)
	pDC->SelectObject(pBrushOld) ;
                                              
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by: Anthony2000Posted on 2009-07-02 at 11:49:21ID: 24766389

Also, I am developing using Visual Studio 6.0, but it will need to work on Windows CE using eVC++ 4.0. Thanks for your help.

 

by: alexey_gusevPosted on 2009-07-02 at 11:56:12ID: 24766464

 

by: Anthony2000Posted on 2009-07-02 at 11:58:34ID: 24766494

Well, those functions will draw the rectangle, but what about filling it with a transparent color? How do I accomplish that? Thanks again for your help.

 

by: alexey_gusevPosted on 2009-07-02 at 11:59:27ID: 24766500

 

by: alexey_gusevPosted on 2009-07-02 at 12:01:57ID: 24766532

that do you exactly mean by "transparent colour" ? could you please explain it in more details?

 

by: Anthony2000Posted on 2009-07-02 at 12:10:27ID: 24766612

Lets say that I have a picture box with text in it. I want to fill in part of the rectangle with a color. So, that part of the text has a blue background  and the rest has a white background. I just wanted to avoid re-drawing the text. Does this help?

 

by: Anthony2000Posted on 2009-07-02 at 12:10:47ID: 24766615

Like a progress control.

 

by: alexey_gusevPosted on 2009-07-02 at 12:18:00ID: 24766761

well, if you change any part of the area then it will be Invalidate()'ed, so you'll get WM_PAINT eventually. thus you'd definitely have to redraw the text somehow. what you could do is to draw the text transparently, so it doesn't matter that's the background.

 

by: Anthony2000Posted on 2009-07-10 at 12:13:09ID: 31599316

I appreciate your help!!

20120131-EE-VQP-002

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