kicad-developers team mailing list archive

[Dick Hollenbeck <dick@...>]

jean-pierre charras wrote:
> Dick Hollenbeck a écrit :
>
> > Jean-Pierre,
> >
> > I have the track's bounding box now. How do I scale it to a dirty 
> > rectangle?
> > Here is what I have now:
> >
> >
> > // redraw the area where the track was
> > EDA_Rect dirty = Track->GetBoundingBox();
> >
> > /* saw this going in the opposite direction from what I think I need:
> > curpos.x = ScreenPos.x * GetZoom();
> > curpos.y = ScreenPos.y * GetZoom();
> >
> > curpos.x += m_DrawOrg.x;
> > curpos.y += m_DrawOrg.y;
> > */
> >
> > // here is the reverse:
> > int zoom = GetZoom();
> >
> > wxPoint drwOrig = GetScreen()->m_DrawOrg;
> >
> > dirty.m_Pos.x = (dirty.m_Pos.x - drwOrig.x) / zoom;
> > dirty.m_Pos.y = (dirty.m_Pos.y - drwOrig.y) / zoom;
> >
> > dirty.m_Size.x = (dirty.m_Size.x - drwOrig.x) / zoom;
> > dirty.m_Size.y = (dirty.m_Size.y - drwOrig.y) / zoom;
> >
> > // pass wxRect() via EDA_Rect::operator wxRect() overload
> > // convert from EDA_Rect to wxRect, no problem here
> > wxRect dirtyR = dirty;
> >
> > DrawPanel->Refresh( TRUE, &dirtyR );
> >
> >
> >
> > Does this look right?
> For me, it looks right ( but i wrote the graphic code some years ago...)
There is no place in the kicad project where invalidated or dirty 
rectangles are generated by us. We are going where no Kicad code has 
gone before. So there is reason to question whether the handling of 
the dirty rectangles in OnPaint() has been wrong for a while and we have 
never noticed it because the rectangles coming *from the system* (as 
opposed to us calling Refresh() with a rect), are large enough to have 
masked a problem.
Or (and more likely) the calculation of the dirtyR above is wrong. The 
sized of the rectangles that we are seeing in OnPaint() are not anything 
like the rectangle that we calculate in dirtyR. I would think they 
would both be device coordinates, same engineering units. Using 
printf() statements in a DEBUG compile on the console, you can use the 
DEBUG compile and then run PCBNEW from the command line, and then pop up 
menu option Dimensions | User Grid Size, then move that popup window 
around the screen to see the types of dirty rectangles being passed to 
OnPaint() and they are significantly SMALLER than the dimensions of the 
rectangle that we calculate for dirtyR when deleting a track segment. 
So I am unclear at this point as to how to calculate dirtyR. Help is 
appreciated. I have spent most of a full day on this already. Thanks.


> > > I also believe ReDraw() must be called only once
This is now in place, see OnPaint(). A debug counter added to old code 
confirmed that ReDraw() was being called as many as 10-15 times per 
OnPaint() when a small dialog window was being dragged across the 
drawpanel. So this is a speed improvement in many cases.

Dick