kicad-developers team mailing list archive

[Bob Gustafson <bobgus@xxxxxxx>]

If you do a Google search on:

     XOR draw mode on OS X

There are a lot of notes and bug reports.

This one might have some useful hints:

http://stackoverflow.com/questions/8951679/drawing-with-xor-in-quartz

Hope this helps

Bob G

On 07/22/2015 12:47 AM, Bernhard Stegmaier wrote:
> > On 22 Jul 2015, at 05:10, Garth Corral <gcorral@xxxxxxxxx
> > <mailto:gcorral@xxxxxxxxx>> wrote:
> >
> >
> > > On Jul 21, 2015, at 1:30 PM, Wayne Stambaugh <stambaughw@xxxxxxxxx
> > > <mailto:stambaughw@xxxxxxxxx>> wrote:
> > >
> > > On 7/21/2015 4:19 PM, Bernhard Stegmaier wrote:
> > > > OK, got it… the crosshair is only shown in some modes (didn’t
> > > > really use
> > > > GAL up to now).
> > > > Yes, works also for me in GAL mode and not in default canvas.
> > >
> > > I'm not sure why this doesn't work in the default canvas.  Someone
> > > should probably take a look at it.  I'm guessing it has something to do
> > > with the overlays used on OSX.
> >
> > Um, perhaps it has something to do with this:
> >
> > #ifdef __WXMAC__
> >     m_defaultCursor = m_currentCursor = wxCURSOR_CROSS;
> >     m_showCrossHair = false;
> > #else
> >     m_defaultCursor = m_currentCursor = wxCURSOR_ARROW;
> >     m_showCrossHair = true;
> > #endif
> >
> > I’m assuming that this was done due to overlay issues as Wayne suggests.
>
> You don’t have a XOR-drawing mode on OS X with wxWidgets, so the usual
> redraw-to-delete doesn’t work here.
> If you want to delete something you have to completely repaint the
> canvas or revert the the last state saved in the overlay (which is
> faster than a complete redraw but still not as fast as just drawing
> two lines).
>
> If I haven’t tried yet, but if you just remove that ifdef I guess
> deletion of the crosshair won’t work at all (you would just fill up
> the canvas with crosshairs). Or, it could be quite slow (there is
> already now some noticeable lag when quickly moving around objects).
> However, I can give it a try on the weekend...
>
> So, the real issue is not to have a XOR draw mode on OS X, which is
> quite the base of every drawing stuff in the default canvas of pcbnew
> and eeschema. Using this overlay hack is just a workaround with many
> problems (especially causing all those redraw issues in eeschema)...
>
>
> Regards,
> Bernhard
>
>
>
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