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src/fl_draw.cxx: improve documentation, add \since 1.4.0,
simplify scaling code, use forgotten 'color' argument to set the
circle color.
src/fl_draw_arrow.cxx: add doxygen \since statement
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This commit is similar to the patch given in STR 3477, oxy_v5.diff:
https://www.fltk.org/strfiles/3477/oxy_v5.diff
... with modifications, and updated to current FLTK code.
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Make sure we don't change the current color after we finish drawing.
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"Arrows" in widgets are those GUI elements mostly represented by
triangles pointing in a particular direction as in scrollbars,
choice widgets, some menus, valuators and Fl_Counter widgets.
The code has been simplified and standardized such that all these
GUI elements are drawn identically per FLTK scheme.
Widget authors no longer need to write code to calculate arrow sizes
and draw polygons etc.
Different schemes can and do implement different drawing functions.
Todo: see comments "FIXME_ARROW" in src/Fl_Menu_Button.cxx and
src/Fl_Menu.cxx
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