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1 pixel wide Brush ?

Posted on 1998-08-10
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Last Modified: 2013-11-20
Hi,
My program's view is based on the CZoomView by Brad Pirtle(codeguru.com Doc-View catagory), which is derieved from CSrollView.

I used the SelectStockObject(BLACK_PEN) to do most of my drawing, so when I zoom in and out the lines stay a the same thickness(1 pixel), this works great.

The problem is when certain items are selected they are redrawn using a brush similar to the PS_ALTERNATE pen in NT (Drawing dotted lines - Jean-Edouard Lachand-Robert/GDI catagory). This works great when you stay in the default zoom mode, but when you zoom in/out the lines really look bad. Sometimes some lines are thicker than others.

What I would like to do is keep them(the dotted lines) at the same 1 pixel width regaurdless of how far in/out you zoom.

I also implement the DrawDragRect, which as you might guessed works great in the default mode. When I zoom in/out things get crazy, it does not redraw it's self correctly. I've testet the CRectTracker which uses the DrawDragRect and it works fine at any zoom. When I call the DrawDragRect I pass it a CSize(1,1) like CRectTracker.

Can anybody help? I'm really stuck :(

Mark

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Question by:studebaker
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scs1 earned 400 total points
ID: 1320533
Mark,
       I have been writing an MFC Application that uses several different pen colors.  I am only using continous lines with 1 pixel thickness.  I use the following commands to create the pen object, define it, and use it.  I think it should work for you.  I also have a zoom-in and zoom-out command in my application and it still works fine.

// creating the pens
CPen *oldpen, redPen, blackPen, yellowPen;

// defining the pens.  The 1 is the pixel width.
redPen.CreatePen(PS_SOLID, 1, RGB(255,0,0));
blackPen.CreatePen(PS_SOLID, 1, RGB(0,0,0));
yellowPen.CreatePen(PS_SOLID, 1, RGB(255,255,0));

//selecting the pen to be used
oldpen=pDC->SelectObject(&redPen);

I hope this is clear and helpful
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