Printing with QtHandles (Was: Fixing fltk printing)

[Ben Abbott]

On Jan 15, 2013, at 11:47 AM, Michael Goffioul wrote:

> The gl2ps method seemed simplest at the time, but was never expected to work 
> all that well.  It is slow and requires the plot to be visible.  And, you 
> could be right that it causes the known race conditions.  It was worse, but 
> various patches have made it better.  I do hope that some graphics expert can 
> spend time on this to find a better method.

<snip>

> Also do not confuse backend/toolkit and renderer. The backend/toolkit 
> provides the windowing system, while the renderer do the actual drawing on 
> the graphics context provided by the toolkit. In theory, the same toolkit 
> could use multiple renderers and I actually designed QtHandles that way (as 
> well as JHandles), though it only support the OpenGL renderer at the moment.
> 
> Michael.

The lack of print() support for QtHandles had caught my attention.  If you're 
interested in working on that, I can handle the m-file part.  The m-file part 
should just involve changing from checking if the fltk toolkit is active to 
checking if OpenGL rendering is being used.  Of course, it will be necessary to 
add a function that is able to determine which renderer is active.  For now 
that can be done on the m-fie side of things by using a if-block or case-blcok.

Ben