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//
// "$Id$"
//
// Arc (integer) drawing functions for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2016 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// http://www.fltk.org/COPYING.php
//
// Please report all bugs and problems on the following page:
//
// http://www.fltk.org/str.php
//
#ifndef FL_CFG_GFX_GDI_ARCI_CXX
#define FL_CFG_GFX_GDI_ARCI_CXX
/**
\file Fl_GDI_Graphics_Driver_arci.cxx
\brief Utility functions for drawing circles using integers
*/
// "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.
#include "Fl_GDI_Graphics_Driver.H"
#include <FL/math.h>
void Fl_GDI_Graphics_Driver::arc(int x,int y,int w,int h,double a1,double a2) {
if (w <= 0 || h <= 0) 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));
if (fabs(a1 - a2) < 90) {
if (xa == xb && ya == yb) SetPixel(gc_, xa, ya, fl_RGB());
else Arc(gc_, x, y, x+w, y+h, xa, ya, xb, yb);
} else Arc(gc_, x, y, x+w, y+h, xa, ya, xb, yb);
}
void Fl_GDI_Graphics_Driver::pie(int x,int y,int w,int h,double a1,double a2) {
if (w <= 0 || h <= 0) return;
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(gc_, fl_brush());
if (fabs(a1 - a2) < 90) {
if (xa == xb && ya == yb) {
MoveToEx(gc_, x+w/2, y+h/2, 0L);
LineTo(gc_, xa, ya);
SetPixel(gc_, xa, ya, fl_RGB());
} else Pie(gc_, x, y, x+w, y+h, xa, ya, xb, yb);
} else Pie(gc_, x, y, x+w, y+h, xa, ya, xb, yb);
}
#endif // FL_CFG_GFX_GDI_ARCI_CXX
//
// End of "$Id$".
//
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