src/fl_round_box.cxx

   1 //
   2 // "$Id: fl_round_box.cxx 8630 2011-05-01 12:45:29Z AlbrechtS $"
   3 //
   4 // Round box drawing routines for the Fast Light Tool Kit (FLTK).
   5 //
   6 // Copyright 1998-2010 by Bill Spitzak and others.
   7 //
   8 // This library is free software; you can redistribute it and/or
   9 // modify it under the terms of the GNU Library General Public
  10 // License as published by the Free Software Foundation; either
  11 // version 2 of the License, or (at your option) any later version.
  12 //
  13 // This library is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 // Library General Public License for more details.
  17 //
  18 // You should have received a copy of the GNU Library General Public
  19 // License along with this library; if not, write to the Free Software
  20 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21 // USA.
  22 //
  23 // Please report all bugs and problems on the following page:
  24 //
  25 //     http://www.fltk.org/str.php
  26 //
  27
  28 // Box drawing code for an obscure box type.
  29 // These box types are in separate files so they are not linked
  30 // in if not used.
  31
  32 #include <FL/Fl.H>
  33 #include <FL/fl_draw.H>
  34
  35 // A compiler from a certain very large software company will not compile
  36 // the function pointer assignment due to the name conflict with fl_arc.
  37 // This function is to fix that:
  38 static void fl_arc_i(int x,int y,int w,int h,double a1,double a2) {
  39   fl_arc(x,y,w,h,a1,a2);
  40 }
  41
  42 enum {UPPER_LEFT, LOWER_RIGHT, CLOSED, FILL};
  43
  44 static void draw(int which, int x,int y,int w,int h, int inset, Fl_Color color)
  45 {
  46   if (inset*2 >= w) inset = (w-1)/2;
  47   if (inset*2 >= h) inset = (h-1)/2;
  48   x += inset;
  49   y += inset;
  50   w -= 2*inset;
  51   h -= 2*inset;
  52   int d = w <= h ? w : h;
  53   if (d <= 1) return;
  54   fl_color(color);
  55   fl_line_style(0,1);
  56   void (*f)(int,int,int,int,double,double);
  57   f = (which==FILL) ? fl_pie : fl_arc_i;
  58   if (which >= CLOSED) {
  59     f(x+w-d, y, d, d, w<=h ? 0 : -90, w<=h ? 180 : 90);
  60     f(x, y+h-d, d, d, w<=h ? 180 : 90, w<=h ? 360 : 270);
  61   } else if (which == UPPER_LEFT) {
  62     f(x+w-d, y, d, d, 45, w<=h ? 180 : 90);
  63     f(x, y+h-d, d, d, w<=h ? 180 : 90, 225);
  64   } else { // LOWER_RIGHT
  65     f(x, y+h-d, d, d, 225, w<=h ? 360 : 270);
  66     f(x+w-d, y, d, d, w<=h ? 360 : 270, 360+45);
  67   }
  68   if (which == FILL) {
  69     if (w < h)
  70       fl_rectf(x, y+d/2, w, h-(d&-2));
  71     else if (w > h)
  72       fl_rectf(x+d/2, y, w-(d&-2), h);
  73   } else {
  74     if (w < h) {
  75       if (which != UPPER_LEFT) fl_yxline(x+w-1, y+d/2-1, y+h-d/2+1);
  76       if (which != LOWER_RIGHT) fl_yxline(x, y+d/2-1, y+h-d/2+1);
  77     } else if (w > h) {
  78       if (which != UPPER_LEFT) fl_xyline(x+d/2-1, y+h-1, x+w-d/2+1);
  79       if (which != LOWER_RIGHT) fl_xyline(x+d/2-1, y, x+w-d/2+1);
  80     }
  81   }
  82   fl_line_style(0);
  83 }
  84
  85 extern uchar* fl_gray_ramp();
  86
  87 void fl_round_down_box(int x, int y, int w, int h, Fl_Color bgcolor) {
  88   uchar *g = fl_gray_ramp();
  89   draw(FILL,        x,   y, w,   h, 2, bgcolor);
  90   draw(UPPER_LEFT,  x+1, y, w-2, h, 0, (Fl_Color)g['N']);
  91   draw(UPPER_LEFT,  x+1, y, w-2, h, 1, (Fl_Color)g['H']);
  92   draw(UPPER_LEFT,  x,   y, w,   h, 0, (Fl_Color)g['N']);
  93   draw(UPPER_LEFT,  x,   y, w,   h, 1, (Fl_Color)g['H']);
  94   draw(LOWER_RIGHT, x,   y, w,   h, 0, (Fl_Color)g['S']);
  95   draw(LOWER_RIGHT, x+1, y, w-2, h, 0, (Fl_Color)g['U']);
  96   draw(LOWER_RIGHT, x,   y, w,   h, 1, (Fl_Color)g['U']);
  97   draw(LOWER_RIGHT, x+1, y, w-2, h, 1, (Fl_Color)g['W']);
  98   draw(CLOSED,      x,   y, w,   h, 2, (Fl_Color)g['A']);
  99 }
 100
 101 void fl_round_up_box(int x, int y, int w, int h, Fl_Color bgcolor) {
 102   uchar *g = fl_gray_ramp();
 103   draw(FILL,        x,   y, w,   h, 2, bgcolor);
 104   draw(LOWER_RIGHT, x+1, y, w-2, h, 0, (Fl_Color)g['H']);
 105   draw(LOWER_RIGHT, x+1, y, w-2, h, 1, (Fl_Color)g['N']);
 106   draw(LOWER_RIGHT, x,   y, w,   h, 1, (Fl_Color)g['H']);
 107   draw(LOWER_RIGHT, x,   y, w,   h, 2, (Fl_Color)g['N']);
 108   draw(UPPER_LEFT,  x,   y, w,   h, 2, (Fl_Color)g['U']);
 109   draw(UPPER_LEFT,  x+1, y, w-2, h, 1, (Fl_Color)g['S']);
 110   draw(UPPER_LEFT,  x,   y, w,   h, 1, (Fl_Color)g['W']);
 111   draw(UPPER_LEFT,  x+1, y, w-2, h, 0, (Fl_Color)g['U']);
 112   draw(CLOSED,      x,   y, w,   h, 0, (Fl_Color)g['A']);
 113 }
 114
 115 extern void fl_internal_boxtype(Fl_Boxtype, Fl_Box_Draw_F*);
 116 Fl_Boxtype fl_define_FL_ROUND_UP_BOX() {
 117   fl_internal_boxtype(_FL_ROUND_DOWN_BOX, fl_round_down_box);
 118   fl_internal_boxtype(_FL_ROUND_UP_BOX, fl_round_up_box);
 119   return _FL_ROUND_UP_BOX;
 120 }
 121
 122 //
 123 // End of "$Id: fl_round_box.cxx 8630 2011-05-01 12:45:29Z AlbrechtS $".
 124 //