diff options
| -rw-r--r-- | src/fl_rounded_box.cxx | 29 |
1 files changed, 20 insertions, 9 deletions
diff --git a/src/fl_rounded_box.cxx b/src/fl_rounded_box.cxx index 17cc9de81..3a2f28880 100644 --- a/src/fl_rounded_box.cxx +++ b/src/fl_rounded_box.cxx @@ -3,7 +3,7 @@ // // Rounded box drawing routines for the Fast Light Tool Kit (FLTK). // -// Copyright 1998-2010 by Bill Spitzak and others. +// Copyright 1998-2016 by Bill Spitzak and others. // // This library is free software. Distribution and use rights are outlined in // the file "COPYING" which should have been included with this file. If this @@ -19,29 +19,40 @@ #include <FL/Fl.H> #include <FL/fl_draw.H> +// Constants for rounded corner drawing algorithm: +// +// RN = number of segments per corner (must match offset array size) +// RS = max. corner radius +// BW = box shadow width + #define RN 5 #define RS 15 #define BW 3 static double offset[RN] = { 0.0, 0.07612, 0.29289, 0.61732, 1.0}; +static inline void fl_vertex_r(double x, double y) { + fl_vertex(x + 0.5, y + 0.5); +} + static void rbox(int fill, int x, int y, int w, int h) { int i; - int rsx ,rsy, rs; - rsx = w*2/5; rsy = h*2/5; - if (rsx > rsy) rs = rsy; else rs = rsx; + int rs, rsy; + rs = w*2/5; rsy = h*2/5; + if (rs > rsy) rs = rsy; // use smaller radius if (rs > RS) rs = RS; - rsx = rs; rsy = rs; + if (rs == 5) rs = 4; // use only even sizes for small corners (STR #2943) + if (rs == 7) rs = 8; // note: 8 is better than 6 (really) if (fill) fl_begin_polygon(); else fl_begin_loop(); for (i=0; i<RN; i++) - fl_vertex(x + offset[RN-i-1]*rsx, y + offset[i] * rsy); + fl_vertex_r(x + offset[RN-i-1]*rs, y + offset[i] * rs); for (i=0; i<RN; i++) - fl_vertex(x + offset[i]*rsx, y + h-1 - offset[RN-i-1] * rsy); + fl_vertex_r(x + offset[i]*rs, y + h-1 - offset[RN-i-1] * rs); for (i=0; i<RN; i++) - fl_vertex(x + w-1 - offset[RN-i-1]*rsx, y + h-1 - offset[i] * rsy); + fl_vertex_r(x + w-1 - offset[RN-i-1]*rs, y + h-1 - offset[i] * rs); for (i=0; i<RN; i++) - fl_vertex(x + w-1 - offset[i]*rsx, y + offset[RN-i-1] * rsy); + fl_vertex_r(x + w-1 - offset[i]*rs, y + offset[RN-i-1] * rs); if (fill) fl_end_polygon(); else fl_end_loop(); } |