Add custom Fl_Arc_Dial.

Fl_Arc_Dial.H

@@ -0,0 +1,80 @@
+
+/*******************************************************************************/
+/* Copyright (C) 2008 Jonathan Moore Liles                                     */
+/*                                                                             */
+/* This program is free software; you can redistribute it and/or modify it     */
+/* under the terms of the GNU General Public License as published by the       */
+/* Free Software Foundation; either version 2 of the License, or (at your      */
+/* option) any later version.                                                  */
+/*                                                                             */
+/* This program is distributed in the hope that it will be useful, but WITHOUT */
+/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or       */
+/* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for   */
+/* more details.                                                               */
+/*                                                                             */
+/* You should have received a copy of the GNU General Public License along     */
+/* with This program; see the file COPYING.  If not,write to the Free Software */
+/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+/*******************************************************************************/
+
+/* simple stylistic variation on Fl_Dial */
+
+#pragma once
+
+#include <FL/Fl_Dial.H>
+
+class Fl_Arc_Dial : public Fl_Dial
+{
+
+public:
+
+    Fl_Arc_Dial ( int X, int Y, int W, int H, const char *L = 0 ) :
+        Fl_Dial( X, Y, W, H, L )
+        {
+            box( FL_OVAL_BOX );
+        }
+
+protected:
+
+    virtual void
+    draw ( void )
+        {
+            int X = x();
+            int Y = y();
+            int W = w();
+            int H = h();
+
+            if ( damage() & FL_DAMAGE_ALL )
+                draw_box( box(), X, Y, W, H, color() );
+
+            X += Fl::box_dx(box());
+            Y += Fl::box_dy(box());
+            W -= Fl::box_dw(box());
+            H -= Fl::box_dh(box());
+
+            double angle = ( angle2() - angle1() ) * ( value() - minimum()) / ( maximum() - minimum() ) + angle1();
+
+            draw_box();
+            draw_label();
+
+            fl_line_style( FL_SOLID, W / 6 );
+
+            X += W / 8;
+            Y += H / 8;
+            W -= W / 4;
+            H -= H / 4;
+
+            fl_color( fl_color_average( FL_BLACK, selection_color(), 0.80f ) );
+
+            fl_arc( X, Y, W, H, 270 - angle1(), 270 - angle2() );
+
+            fl_color( selection_color() );
+
+            if ( type() == FL_FILL_DIAL )
+                fl_arc( X, Y, W, H, 270 - angle1(), 270 - angle  );
+            else
+                fl_arc( X, Y, W, H, 270 - angle - 3, 270 - angle + 3 );
+
+            fl_line_style( FL_SOLID, 0 );
+        }
+};