62b30f85cb
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@9023 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
124 lines
3.8 KiB
C++
124 lines
3.8 KiB
C++
//
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// "$Id$"
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//
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// Arc (integer) drawing functions for the Fast Light Tool Kit (FLTK).
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//
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// Copyright 1998-2010 by Bill Spitzak and others.
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//
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// This library is free software. Distribution and use rights are outlined in
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// the file "COPYING" which should have been included with this file. If this
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// file is missing or damaged, see the license at:
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//
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// http://www.fltk.org/COPYING.php
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//
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// Please report all bugs and problems on the following page:
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//
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// http://www.fltk.org/str.php
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//
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/**
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\file fl_arci.cxx
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\brief Utility functions for drawing circles using integers
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*/
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// "integer" circle drawing functions. These draw the limited
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// circle types provided by X and NT graphics. The advantage of
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// these is that small ones draw quite nicely (probably due to stored
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// hand-drawn bitmaps of small circles!) and may be implemented by
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// hardware and thus are fast.
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// Probably should add fl_chord.
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// 3/10/98: created
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#include <FL/fl_draw.H>
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#include <FL/x.H>
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#ifdef WIN32
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# include <FL/math.h>
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#endif
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#include <config.h>
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void Fl_Graphics_Driver::arc(int x,int y,int w,int h,double a1,double a2) {
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if (w <= 0 || h <= 0) return;
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#if defined(USE_X11)
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XDrawArc(fl_display, fl_window, fl_gc, x,y,w-1,h-1, int(a1*64),int((a2-a1)*64));
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#elif defined(WIN32)
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int xa = x+w/2+int(w*cos(a1/180.0*M_PI));
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int ya = y+h/2-int(h*sin(a1/180.0*M_PI));
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int xb = x+w/2+int(w*cos(a2/180.0*M_PI));
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int yb = y+h/2-int(h*sin(a2/180.0*M_PI));
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if (fabs(a1 - a2) < 90) {
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if (xa == xb && ya == yb) SetPixel(fl_gc, xa, ya, fl_RGB());
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else Arc(fl_gc, x, y, x+w, y+h, xa, ya, xb, yb);
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} else Arc(fl_gc, x, y, x+w, y+h, xa, ya, xb, yb);
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#elif defined(__APPLE_QUARTZ__)
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a1 = (-a1)/180.0f*M_PI; a2 = (-a2)/180.0f*M_PI;
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float cx = x + 0.5f*w - 0.5f, cy = y + 0.5f*h - 0.5f;
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CGContextSetShouldAntialias(fl_gc, true);
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if (w!=h) {
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CGContextSaveGState(fl_gc);
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CGContextTranslateCTM(fl_gc, cx, cy);
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CGContextScaleCTM(fl_gc, w-1.0f, h-1.0f);
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CGContextAddArc(fl_gc, 0, 0, 0.5, a1, a2, 1);
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CGContextRestoreGState(fl_gc);
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} else {
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float r = (w+h)*0.25f-0.5f;
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CGContextAddArc(fl_gc, cx, cy, r, a1, a2, 1);
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}
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CGContextStrokePath(fl_gc);
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CGContextSetShouldAntialias(fl_gc, false);
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#else
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# error unsupported platform
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#endif
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}
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void Fl_Graphics_Driver::pie(int x,int y,int w,int h,double a1,double a2) {
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if (w <= 0 || h <= 0) return;
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#if defined(USE_X11)
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XDrawArc(fl_display, fl_window, fl_gc, x,y,w-1,h-1, int(a1*64),int((a2-a1)*64));
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XFillArc(fl_display, fl_window, fl_gc, x,y,w-1,h-1, int(a1*64),int((a2-a1)*64));
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#elif defined(WIN32)
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if (a1 == a2) return;
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int xa = x+w/2+int(w*cos(a1/180.0*M_PI));
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int ya = y+h/2-int(h*sin(a1/180.0*M_PI));
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int xb = x+w/2+int(w*cos(a2/180.0*M_PI));
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int yb = y+h/2-int(h*sin(a2/180.0*M_PI));
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SelectObject(fl_gc, fl_brush());
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if (fabs(a1 - a2) < 90) {
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if (xa == xb && ya == yb) {
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MoveToEx(fl_gc, x+w/2, y+h/2, 0L);
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LineTo(fl_gc, xa, ya);
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SetPixel(fl_gc, xa, ya, fl_RGB());
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} else Pie(fl_gc, x, y, x+w, y+h, xa, ya, xb, yb);
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} else Pie(fl_gc, x, y, x+w, y+h, xa, ya, xb, yb);
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#elif defined(__APPLE_QUARTZ__)
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a1 = (-a1)/180.0f*M_PI; a2 = (-a2)/180.0f*M_PI;
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float cx = x + 0.5f*w - 0.5f, cy = y + 0.5f*h - 0.5f;
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CGContextSetShouldAntialias(fl_gc, true);
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if (w!=h) {
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CGContextSaveGState(fl_gc);
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CGContextTranslateCTM(fl_gc, cx, cy);
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CGContextScaleCTM(fl_gc, w, h);
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CGContextAddArc(fl_gc, 0, 0, 0.5, a1, a2, 1);
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CGContextAddLineToPoint(fl_gc, 0, 0);
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CGContextClosePath(fl_gc);
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CGContextRestoreGState(fl_gc);
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} else {
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float r = (w+h)*0.25f;
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CGContextAddArc(fl_gc, cx, cy, r, a1, a2, 1);
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CGContextAddLineToPoint(fl_gc, cx, cy);
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CGContextClosePath(fl_gc);
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}
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CGContextFillPath(fl_gc);
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CGContextSetShouldAntialias(fl_gc, false);
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#else
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# error unsupported platform
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#endif
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}
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//
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// End of "$Id$".
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//
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