src/fl_arci.cxx

   1 //
   2 // "$Id: fl_arci.cxx 7903 2010-11-28 21:06:39Z matt $"
   3 //
   4 // Arc (integer) drawing functions 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 /**
  29   \file fl_arci.cxx
  30   \brief Utility functions for drawing circles using integers
  31 */
  32
  33 // "integer" circle drawing functions.  These draw the limited
  34 // circle types provided by X and NT graphics.  The advantage of
  35 // these is that small ones draw quite nicely (probably due to stored
  36 // hand-drawn bitmaps of small circles!) and may be implemented by
  37 // hardware and thus are fast.
  38
  39 // Probably should add fl_chord.
  40
  41 // 3/10/98: created
  42
  43 #include <FL/fl_draw.H>
  44 #include <FL/x.H>
  45 #ifdef WIN32
  46 #  include <FL/math.h>
  47 #endif
  48 #include <config.h>
  49
  50 void Fl_Graphics_Driver::arc(int x,int y,int w,int h,double a1,double a2) {
  51   if (w <= 0 || h <= 0) return;
  52
  53 #if defined(USE_X11)
  54   XDrawArc(fl_display, fl_window, fl_gc, x,y,w-1,h-1, int(a1*64),int((a2-a1)*64));
  55 #elif defined(WIN32)
  56   int xa = x+w/2+int(w*cos(a1/180.0*M_PI));
  57   int ya = y+h/2-int(h*sin(a1/180.0*M_PI));
  58   int xb = x+w/2+int(w*cos(a2/180.0*M_PI));
  59   int yb = y+h/2-int(h*sin(a2/180.0*M_PI));
  60   if (fabs(a1 - a2) < 90) {
  61     if (xa == xb && ya == yb) SetPixel(fl_gc, xa, ya, fl_RGB());
  62     else Arc(fl_gc, x, y, x+w, y+h, xa, ya, xb, yb);
  63   } else Arc(fl_gc, x, y, x+w, y+h, xa, ya, xb, yb);
  64 #elif defined(__APPLE_QUARTZ__)
  65   a1 = (-a1)/180.0f*M_PI; a2 = (-a2)/180.0f*M_PI;
  66   float cx = x + 0.5f*w - 0.5f, cy = y + 0.5f*h - 0.5f;
  67   CGContextSetShouldAntialias(fl_gc, true);
  68   if (w!=h) {
  69     CGContextSaveGState(fl_gc);
  70     CGContextTranslateCTM(fl_gc, cx, cy);
  71     CGContextScaleCTM(fl_gc, w-1.0f, h-1.0f);
  72     CGContextAddArc(fl_gc, 0, 0, 0.5, a1, a2, 1);
  73     CGContextRestoreGState(fl_gc);
  74   } else {
  75     float r = (w+h)*0.25f-0.5f;
  76     CGContextAddArc(fl_gc, cx, cy, r, a1, a2, 1);
  77   }
  78   CGContextStrokePath(fl_gc);
  79   CGContextSetShouldAntialias(fl_gc, false);
  80 #else
  81 # error unsupported platform
  82 #endif
  83 }
  84
  85 void Fl_Graphics_Driver::pie(int x,int y,int w,int h,double a1,double a2) {
  86   if (w <= 0 || h <= 0) return;
  87
  88 #if defined(USE_X11)
  89   XFillArc(fl_display, fl_window, fl_gc, x,y,w-1,h-1, int(a1*64),int((a2-a1)*64));
  90 #elif defined(WIN32)
  91   if (a1 == a2) return;
  92   int xa = x+w/2+int(w*cos(a1/180.0*M_PI));
  93   int ya = y+h/2-int(h*sin(a1/180.0*M_PI));
  94   int xb = x+w/2+int(w*cos(a2/180.0*M_PI));
  95   int yb = y+h/2-int(h*sin(a2/180.0*M_PI));
  96   SelectObject(fl_gc, fl_brush());
  97   if (fabs(a1 - a2) < 90) {
  98     if (xa == xb && ya == yb) {
  99       MoveToEx(fl_gc, x+w/2, y+h/2, 0L);
 100       LineTo(fl_gc, xa, ya);
 101       SetPixel(fl_gc, xa, ya, fl_RGB());
 102     } else Pie(fl_gc, x, y, x+w, y+h, xa, ya, xb, yb);
 103   } else Pie(fl_gc, x, y, x+w, y+h, xa, ya, xb, yb);
 104 #elif defined(__APPLE_QUARTZ__)
 105   a1 = (-a1)/180.0f*M_PI; a2 = (-a2)/180.0f*M_PI;
 106   float cx = x + 0.5f*w - 0.5f, cy = y + 0.5f*h - 0.5f;
 107   CGContextSetShouldAntialias(fl_gc, true);
 108   if (w!=h) {
 109     CGContextSaveGState(fl_gc);
 110     CGContextTranslateCTM(fl_gc, cx, cy);
 111     CGContextScaleCTM(fl_gc, w, h);
 112     CGContextAddArc(fl_gc, 0, 0, 0.5, a1, a2, 1);
 113     CGContextAddLineToPoint(fl_gc, 0, 0);
 114     CGContextClosePath(fl_gc);
 115     CGContextRestoreGState(fl_gc);
 116   } else {
 117     float r = (w+h)*0.25f;
 118     CGContextAddArc(fl_gc, cx, cy, r, a1, a2, 1);
 119     CGContextAddLineToPoint(fl_gc, cx, cy);
 120     CGContextClosePath(fl_gc);
 121   }
 122   CGContextFillPath(fl_gc);
 123   CGContextSetShouldAntialias(fl_gc, false);
 124 #else
 125 # error unsupported platform
 126 #endif
 127 }
 128
 129 //
 130 // End of "$Id: fl_arci.cxx 7903 2010-11-28 21:06:39Z matt $".
 131 //