ref: e447c9fb929e61a40203b0193ee8d4cab8d72f7e
dir: /DoConfig/fltk/src/fl_arci.cxx/
// // "$Id$" // // Arc (integer) drawing functions for the Fast Light Tool Kit (FLTK). // // Copyright 1998-2010 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 // /** \file fl_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. // 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 #include <config.h> void Fl_Graphics_Driver::arc(int x,int y,int w,int h,double a1,double a2) { if (w <= 0 || h <= 0) return; #if defined(USE_X11) XDrawArc(fl_display, fl_window, fl_gc, x,y,w-1,h-1, int(a1*64),int((a2-a1)*64)); #elif defined(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)); if (fabs(a1 - a2) < 90) { if (xa == xb && ya == yb) SetPixel(fl_gc, xa, ya, fl_RGB()); else Arc(fl_gc, x, y, x+w, y+h, xa, ya, xb, yb); } else Arc(fl_gc, x, y, x+w, y+h, xa, ya, xb, yb); #elif defined(__APPLE_QUARTZ__) a1 = (-a1)/180.0f*M_PI; a2 = (-a2)/180.0f*M_PI; float cx = x + 0.5f*w - 0.5f, cy = y + 0.5f*h - 0.5f; CGContextSetShouldAntialias(fl_gc, true); if (w!=h) { CGContextSaveGState(fl_gc); CGContextTranslateCTM(fl_gc, cx, cy); CGContextScaleCTM(fl_gc, w-1.0f, h-1.0f); CGContextAddArc(fl_gc, 0, 0, 0.5, a1, a2, 1); CGContextRestoreGState(fl_gc); } else { float r = (w+h)*0.25f-0.5f; CGContextAddArc(fl_gc, cx, cy, r, a1, a2, 1); } CGContextStrokePath(fl_gc); CGContextSetShouldAntialias(fl_gc, false); #else # error unsupported platform #endif } void Fl_Graphics_Driver::pie(int x,int y,int w,int h,double a1,double a2) { if (w <= 0 || h <= 0) return; #if defined(USE_X11) XDrawArc(fl_display, fl_window, fl_gc, x,y,w-1,h-1, int(a1*64),int((a2-a1)*64)); XFillArc(fl_display, fl_window, fl_gc, x,y,w-1,h-1, int(a1*64),int((a2-a1)*64)); #elif defined(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()); if (fabs(a1 - a2) < 90) { if (xa == xb && ya == yb) { MoveToEx(fl_gc, x+w/2, y+h/2, 0L); LineTo(fl_gc, xa, ya); SetPixel(fl_gc, xa, ya, fl_RGB()); } else Pie(fl_gc, x, y, x+w, y+h, xa, ya, xb, yb); } else Pie(fl_gc, x, y, x+w, y+h, xa, ya, xb, yb); #elif defined(__APPLE_QUARTZ__) a1 = (-a1)/180.0f*M_PI; a2 = (-a2)/180.0f*M_PI; float cx = x + 0.5f*w - 0.5f, cy = y + 0.5f*h - 0.5f; CGContextSetShouldAntialias(fl_gc, true); if (w!=h) { CGContextSaveGState(fl_gc); CGContextTranslateCTM(fl_gc, cx, cy); CGContextScaleCTM(fl_gc, w, h); CGContextAddArc(fl_gc, 0, 0, 0.5, a1, a2, 1); CGContextAddLineToPoint(fl_gc, 0, 0); CGContextClosePath(fl_gc); CGContextRestoreGState(fl_gc); } else { float r = (w+h)*0.25f; CGContextAddArc(fl_gc, cx, cy, r, a1, a2, 1); CGContextAddLineToPoint(fl_gc, cx, cy); CGContextClosePath(fl_gc); } CGContextFillPath(fl_gc); CGContextSetShouldAntialias(fl_gc, false); #else # error unsupported platform #endif } // // End of "$Id$". //