Customize corner radius for rounded box/frame (#130)

Make maximum box corner radius and shadow width configurable.
See Fl::box_border_radius_max() and Fl::box_shadow_width().

Documentation: update image of box types.

Fixes #130

1 files changed, 30 insertions, 0 deletions

diff --git a/FL/Fl.H b/FL/Fl.H
index 4221d9588..fae394012 100644
--- a/FL/Fl.H
+++ b/FL/Fl.H
@@ -133,6 +133,8 @@ private:
 
   static int use_high_res_GL_;
   static int draw_GL_text_with_textures_;
+  static int box_shadow_width_;
+  static int box_border_radius_max_;
 
 public:
 
@@ -141,6 +143,34 @@ public:
   static void reset_marked_text(); // resets marked text
   static void insertion_point_location(int x, int y, int height); // sets window coordinates & height of insertion point
 
+  /** Get the box shadow width of all "shadow" boxtypes in pixels.
+    \since 1.4.0
+  */
+  static int box_shadow_width() { return box_shadow_width_; }
+  /** Set the box shadow width of all "shadow" boxtypes in pixels.
+    Must be at least 1, default = 3. There is no upper limit.
+    \since 1.4.0
+  */
+  static void box_shadow_width(int W) { box_shadow_width_ = W < 1 ? 1 : W; }
+
+  /** Get the maximum border radius of all "rounded" boxtypes in pixels.
+      \since 1.4.0
+  */
+  static int box_border_radius_max() { return box_border_radius_max_; }
+  /** Set the maximum border radius of all "rounded" boxtypes in pixels.
+    Must be at least 5, default = 15.
+
+    \note This does \b not apply to the "round" boxtypes which have really round sides
+      (i.e. composed of half circles) as opposed to "rounded" boxtypes that have only
+      rounded corners with a straight border between corners.
+
+    The box border radius of "rounded" boxtypes is typically calculated as about 2/5 of
+    the box height or width, whichever is smaller. The upper limit can be set by this
+    method for all "rounded" boxtypes.
+    \since 1.4.0
+  */
+  static void box_border_radius_max(int R) { box_border_radius_max_ = R < 5 ? 5 : R; }
+
 public: // run time information about compile time configuration
   /** \defgroup cfg_gfx runtime graphics driver configuration */
   /** @{ */