diff options
Diffstat (limited to 'src/fl_arc.cxx')
| -rw-r--r-- | src/fl_arc.cxx | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/src/fl_arc.cxx b/src/fl_arc.cxx index d4910aa1c..7d3872901 100644 --- a/src/fl_arc.cxx +++ b/src/fl_arc.cxx @@ -25,6 +25,11 @@ // http://www.fltk.org/str.php // +/** + \file fl_arc.cxx + \brief Utility functions for drawing arcs and circles. +*/ + // Utility for drawing arcs and circles. They are added to // the current fl_begin/fl_vertex/fl_end path. // Incremental math implementation: @@ -38,7 +43,14 @@ static double _fl_hypot(double x, double y) { return sqrt(x*x + y*y); } - +/** + Add a series of points to the current path on the arc of a circle; you + can get elliptical paths by using scale and rotate before calling fl_arc(). + \param[in] x,y,r center and radius of circular arc + \param[in] start,end angles of start and end of arc measured in degrees + counter-clockwise from 3 o'clock. If \a end is less than \a start + then it draws the ark in a clockwise direction. +*/ void fl_arc(double x, double y, double r, double start, double end) { // draw start point accurately: |