Solved

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

Posted on 2009-07-02
11
1,033 Views
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.
0
Comment
Question by:Anthony2000
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 6
  • 5
11 Comments
 
LVL 24

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
0
 
LVL 8

Author Comment

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) ;

Open in new window

0
 
LVL 8

Author Comment

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.
0
WordPress Tutorial 1: Installation & Setup

WordPress is a very popular option for running your web site and can be used to get your content online quickly for the world to see. This guide will walk you through installing the WordPress server software and the initial setup process.

 
LVL 24

Accepted Solution

by:
alexey_gusev earned 500 total points
ID: 24766464
0
 
LVL 8

Author Comment

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.
0
 
LVL 24

Expert Comment

by:alexey_gusev
ID: 24766532
that do you exactly mean by "transparent colour" ? could you please explain it in more details?
0
 
LVL 8

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?
0
 
LVL 8

Author Comment

by:Anthony2000
ID: 24766615
Like a progress control.
0
 
LVL 24

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.
0
 
LVL 8

Author Closing Comment

by:Anthony2000
ID: 31599316
I appreciate your help!!
0

Featured Post

SharePoint Admin?

Enable Your Employees To Focus On The Core With Intuitive Onscreen Guidance That is With You At The Moment of Need.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

There are many software programs on offer that will claim to magically speed up your computer. The best advice I can give you is to avoid them like the plague, because they will often cause far more problems than they solve. Try some of these "do it…
This article shows how to use a free utility called 'Parkdale' to easily test the performance and benchmark any Hard Drive(s) installed in your computer. We also look at RAM Disks and their speed comparisons.
This Micro Tutorial will give you a basic overview of Windows DVD Burner through its features and interface. This will be demonstrated using Windows 7 operating system.
The Task Scheduler is a powerful tool that is built into Windows. It allows you to schedule tasks (actions) on a recurring basis, such as hourly, daily, weekly, monthly, at log on, at startup, on idle, etc. This video Micro Tutorial is a brief intro…

636 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question