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lineclip.hpp

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00001 
00005 /* Copyright (c) 2005-2010 Taneli Kalvas. All rights reserved.
00006  *
00007  * You can redistribute this software and/or modify it under the terms
00008  * of the GNU General Public License as published by the Free Software
00009  * Foundation; either version 2 of the License, or (at your option)
00010  * any later version.
00011  * 
00012  * This library is distributed in the hope that it will be useful, but
00013  * WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
00015  * General Public License for more details.
00016  * 
00017  * You should have received a copy of the GNU General Public License
00018  * along with this library (file "COPYING" included in the package);
00019  * if not, write to the Free Software Foundation, Inc., 51 Franklin
00020  * Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  * 
00022  * If you have questions about your rights to use or distribute this
00023  * software, please contact Berkeley Lab's Technology Transfer
00024  * Department at TTD@lbl.gov. Other questions, comments and bug
00025  * reports should be sent directly to the author via email at
00026  * taneli.kalvas@jyu.fi.
00027  * 
00028  * NOTICE. This software was developed under partial funding from the
00029  * U.S.  Department of Energy.  As such, the U.S. Government has been
00030  * granted for itself and others acting on its behalf a paid-up,
00031  * nonexclusive, irrevocable, worldwide license in the Software to
00032  * reproduce, prepare derivative works, and perform publicly and
00033  * display publicly.  Beginning five (5) years after the date
00034  * permission to assert copyright is obtained from the U.S. Department
00035  * of Energy, and subject to any subsequent five (5) year renewals,
00036  * the U.S. Government is granted for itself and others acting on its
00037  * behalf a paid-up, nonexclusive, irrevocable, worldwide license in
00038  * the Software to reproduce, prepare derivative works, distribute
00039  * copies to the public, perform publicly and display publicly, and to
00040  * permit others to do so.
00041  */
00042 
00043 #ifndef LINECLIP_HPP
00044 #define LINECLIP_HPP 1
00045 
00046 #include <cairo.h>
00047 
00048 
00057 class LineClip {
00058     cairo_t  *p_dc;          /* Cairo context */
00059     double    clip[4];       /* xmin, ymin, xmax, ymax  */
00060     
00061     double    first[2];      /* Last user given moveto point (first point of path) */
00062     
00063     double    last[2];       /* last user given point, nan if not available */
00064     int       last_outcode;  /* outcode of last user given point */
00065     int       last_op;       /* last operation 0=lineto, 1=moveto, 2=no op */
00066     
00067     double    drawn[2];      /* last drawn point */
00068     int       drawn_outcode; /* outcode of last drawn point */
00069     
00070     int       coord_alloc;   /* Allocated size of coordinate database */
00071     double   *coord;         /* Buffer for storing line coordinates in curve_to */
00072 
00073     int outcode( double x, double y );
00074     int exit_outcode( double x, double y );
00075     void get_point( double *coords, double t,
00076                     double x0, double y0,
00077                     double x1, double y1,
00078                     double x2, double y2,
00079                     double x3, double y3 );
00080 
00081 public:
00082 
00083     LineClip( cairo_t *cairo );
00084     ~LineClip();
00085 
00086     void set( double xmin, double ymin, double xmax, double ymax );
00087     void reset();
00088 
00089     void move_to( double x, double y );
00090     void line_to( double x, double y );
00091     void curve_to( double x1, double y1,
00092                    double x2, double y2,
00093                    double x3, double y3 );
00094     void close_path();
00095     void fill();
00096 };
00097 
00098 
00099 #endif
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Reference manual for Ion Beam Simulator 1.0.5dev
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