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Home » U++ Library support » Draw, Display, Images, Bitmaps, Icons » RectTracker filled with black
Re: RectTracker filled with black [message #14124 is a reply to message #14122] Wed, 13 February 2008 12:40 Go to previous messageGo to previous message
cbpporter is currently offline  cbpporter
Messages: 1427
Registered: September 2007
Ultimate Contributor
Quote:

DrawDragRect doesn't work properly with backwards rectangles.

This seems to be the problem. Works fine with the swapped coords. I'm a little worried about the precision of the end-point coordinate, which seems of by a pixel in both dimensions (seen more clearly when Image::Cross() cursor is used, and end-point is mouse coord), but I can't tell for sure. U++ Rect is extremely counter intuitive for me and I have to battle years of experience with completely different rectangle semantics, so until I get used to this, it is really hard to make sense of code which uses rect.

Quote:

For a test case just change the default behaviour in RectTracker example (ie no control keys) to ALIGN_NULL/ALIGN_NULL.

Forgot about that one. At least I don't have to write a testcase Smile.

Quote:

For instance, what is the purpose of ViewDraw?

I found it this morning before work too. I didn't look into it because I was already having a headache with all those rects, but you can find a lot of such classes in U++. I don't know if even Mirek remembers them all?
 
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