fltk/src/fl_arci.cxx

//
// "$Id: fl_arci.cxx,v 1.4.2.5.2.8 2004/08/26 06:18:12 matthiaswm Exp $"
//
// Arc (integer) drawing functions for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2004 by Bill Spitzak and others.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//
// Please report all bugs and problems to "fltk-bugs@fltk.org".
//

// "integer" circle drawing functions.  These draw the limited
// circle types provided by X and NT graphics.  The advantage of
// these is that small ones draw quite nicely (probably due to stored
// hand-drawn bitmaps of small circles!) and may be implemented by
// hardware and thus are fast.

// Probably should add fl_chord.

// 3/10/98: created

#include <FL/fl_draw.H>
#include <FL/x.H>
#ifdef WIN32
#include <FL/math.h>
#endif
#ifdef __APPLE__
#include <config.h>
#endif

void fl_arc(int x,int y,int w,int h,double a1,double a2) {
  if (w <= 0 || h <= 0) return;
#ifdef WIN32
  int xa = x+w/2+int(w*cos(a1/180.0*M_PI));
  int ya = y+h/2-int(h*sin(a1/180.0*M_PI));
  int xb = x+w/2+int(w*cos(a2/180.0*M_PI));
  int yb = y+h/2-int(h*sin(a2/180.0*M_PI));
  Arc(fl_gc, x, y, x+w, y+h, xa, ya, xb, yb); 
#elif defined(__APPLE_QD__)
  Rect r; r.left=x; r.right=x+w; r.top=y; r.bottom=y+h;
  a1 = a2-a1; a2 = 450-a2;
  FrameArc(&r, (short int)a2, (short int)a1);
#elif defined(__APPLE_QUARTZ__)
#  warning : no support for ovals yet!
  float cx = x + 0.5f*w, cy = y + 0.5f*h;
  float r = (w+h)*0.25f;
  CGContextAddArc(fl_gc, cx, cy, r, a1/180.0f*M_PI, a2/180.0f*M_PI, 1);
  CGContextStrokePath(fl_gc);
#else
  XDrawArc(fl_display, fl_window, fl_gc, x,y,w-1,h-1, int(a1*64),int((a2-a1)*64));
#endif
}

void fl_pie(int x,int y,int w,int h,double a1,double a2) {
  if (w <= 0 || h <= 0) return;
#ifdef WIN32
  if (a1 == a2) return;
  int xa = x+w/2+int(w*cos(a1/180.0*M_PI));
  int ya = y+h/2-int(h*sin(a1/180.0*M_PI));
  int xb = x+w/2+int(w*cos(a2/180.0*M_PI));
  int yb = y+h/2-int(h*sin(a2/180.0*M_PI));
  SelectObject(fl_gc, fl_brush());
  Pie(fl_gc, x, y, x+w, y+h, xa, ya, xb, yb); 
#elif defined(__APPLE_QD__)
  Rect r; r.left=x; r.right=x+w; r.top=y; r.bottom=y+h;
  a1 = a2-a1; a2 = 450-a2;
  PaintArc(&r, (short int)a2, (short int)a1);
#elif defined(__APPLE_QUARTZ__)
#  warning : no support for ovals yet!
  float cx = x + 0.5f*w, cy = y + 0.5f*h;
  float r = (w+h)*0.25f;
  CGContextAddArc(fl_gc, cx, cy, r, a1/180.0f*M_PI, a2/180.0f*M_PI, 1);
  CGContextFillPath(fl_gc);
#else
  XFillArc(fl_display, fl_window, fl_gc, x,y,w,h, int(a1*64),int((a2-a1)*64));
#endif
}

//
// End of "$Id: fl_arci.cxx,v 1.4.2.5.2.8 2004/08/26 06:18:12 matthiaswm Exp $".
//