Declan McMullen wrote:
Hey guys,
quick query about using wxArt2d. I had a problem recently with
wxwidgets. I was using the graphics context
to do some simple floating point drawing but I was unable to print it
out. The printer dc in widgets didnt
support floating point. If i use wxart2d to draw my graphics instead can
i print them out with floating point accuracy?
wxArt2D uses a context around other drawing context classes.
And all are based on drawing with double, even if internal it is drawn
eventually on a pixel screen in integers.
But Antigrain goes even beyond that and draws subpixel.
In othere words, we have taken care to only convert to integer at the very last
moment. And that is same when printing using a wxDc based context.
So there is a a2dDcDrawer, which is a wxDC based a2dDrawer2D.
And the same for using Antigrain and GdiPlus internal in the a2dDrawer2D derived
context. This last one is recent.
I am not sure what is needed to make GdiPlus print.
But anyway you can print using a drawing defined in double, and somewhere
internal it will be converted to integers on the printing paper.
And i think this is right, since in the end a print does no do float printing i
think. Are does it in postscript??
The trick is that the drawing is in doubles, and tat you can display any part of
it in a window/view. So accuracy is almost endless.
I should also mention what the software does. It produces talking
tactile diagrams for bling leaners.
No idea what that is.
We import a graphic
draw over the top of it to mark important areas and add layers of audio
information to those areas. we then print
the graphic. When its placed on a touchscreen and the user presses on it
the layers of information for the part of
the graphic they pressed are played back. The prototype system just used
the normal graphics context drawing methods
of ellipses and polygons and so on but now were looking to improve that
part of the system and wxart2d seems the best
candidate.
Should not be a problem. But be aware that images/bitmaps in vector graphics is
not always fast. Especially when zooming in and out.
But it looks like you are not using images??
Klaas
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