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Expand the doc of class Fl_Graphics_Driver.

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git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12876 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Manolo Gouy
2018-04-27 16:50:27 +00:00
parent cd3d1f9dd5
commit 929efec855
1 changed files with 6 additions and 3 deletions
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FL/Fl_Graphics_Driver.H
+6 -3
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@@ -66,9 +66,12 @@ struct Fl_Fontdesc;
Fl_Surface_Device::pop_current() / Fl_Surface_Device::set_current().
\p The Fl_Graphics_Driver class is of interest if one wants to perform new kinds of drawing operations.
An example would be to draw to a PDF file. This would involve creating a new Fl_Graphics_Driver derived
class. This new class should implement all virtual methods of the Fl_Graphics_Driver class
to support all FLTK drawing functions.
An example would be to draw to an SVG file. This would require to create a new class,
say SVG_Graphics_Driver, derived from class Fl_Graphics_Driver, and another new class,
say SVG_Surface, derived from class Fl_Surface_Device. The new SVG_Graphics_Driver class should
implement all virtual methods of the Fl_Graphics_Driver class to support all FLTK drawing functions
and have them draw into SVG files. Alternatively, class SVG_Graphics_Driver could implement only some
virtual methods, and only part of FLTK drawing functions would be usable when drawing to SVG files.
\p The Fl_Graphics_Driver class is essential for developers of the FLTK library.
Each platform supported by FLTK requires to create a derived class of Fl_Graphics_Driver that