915d6c643a
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3-porting@11432 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
72 lines
2.2 KiB
C++
72 lines
2.2 KiB
C++
//
|
|
// "$Id$"
|
|
//
|
|
// 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>
|
|
#include <FL/x.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 "$Id$".
|
|
//
|