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

Posted on 2009-07-02
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Last Modified: 2013-12-21
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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Question by:Anthony2000
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Expert Comment

by:alexey_gusev
ID: 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
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by:Anthony2000
ID: 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:Anthony2000
ID: 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.
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alexey_gusev earned 2000 total points
ID: 24766464
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by:Anthony2000
ID: 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.
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Expert Comment

by:alexey_gusev
ID: 24766532
that do you exactly mean by "transparent colour" ? could you please explain it in more details?
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Author Comment

by:Anthony2000
ID: 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?
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Author Comment

by:Anthony2000
ID: 24766615
Like a progress control.
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Expert Comment

by:alexey_gusev
ID: 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.
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Author Closing Comment

by:Anthony2000
ID: 31599316
I appreciate your help!!
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