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dynamic pen (change color on fly)

Posted on 1999-07-21
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Last Modified: 2013-11-20
Good morning everyone,

I try to find a way in MFC to change the color of a pen dynamically on fly basing on the pixels of the screen (such as hightlighting, etc).  Here is my question:

      Can the color of a pen be changed dynamically according to a logical function based on pixel color of the source and destination at the time the graphics is drawn?

In X window,  this can be done easily by XCreateGC(...) in which one of the argument values provides a way to to logical function such as (exclusive OR) between source pixel (generated by graphics request)  and destination pixel (existing pixel value-current contents of screen) to create a new pixel value (new contents of screen).

example:  XOR

        source                       10001110
        destination                  11001001
         -----------                -----------
         new                         01000111

So basing on this capability, one can manupilate the logical function to produce the drawing(such as a line ) with has a  desired color over a dark or  a white area accordingly.

Please tell me if this can be done in MFC or direct me to any source that may help.   Thank you very much.
Rergards,
-Thang

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Question by:tpnguyen
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naveenkohli earned 800 total points
ID: 1310913
You can do the same thing in MFC too...
Use SetROP2 (nDrawMode) memeber function of CDC. In the draw mode you can specify the logic you want DC to use when doing the drawing like

R2_MERGEPENNOT
R2_MASKPENNOT
R2_MERGENOTPEN

You can read the documentation on this function for the meaning of this draw options....

Here is piece of code from my application where i was trying to draw the backgound in highlight color..

pDC->SetTextColor (RGB (255, 255, 255));
                  bkBrush.CreateSysColorBrush (COLOR_HIGHLIGHT);
                  pDC->SetROP2 (R2_NOT);
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by:tpnguyen
ID: 1310915
Thank you very much.
-Thang
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