lineclip.hpp
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1 
5 /* Copyright (c) 2005-2010 Taneli Kalvas. All rights reserved.
6  *
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42 
43 #ifndef LINECLIP_HPP
44 #define LINECLIP_HPP 1
45 
46 #include <cairo.h>
47 
48 
57 class LineClip {
58  cairo_t *p_dc; /* Cairo context */
59  double clip[4]; /* xmin, ymin, xmax, ymax */
60 
61  double first[2]; /* Last user given moveto point (first point of path) */
62 
63  double last[2]; /* last user given point, nan if not available */
64  int last_outcode; /* outcode of last user given point */
65  int last_op; /* last operation 0=lineto, 1=moveto, 2=no op */
66 
67  double drawn[2]; /* last drawn point */
68  int drawn_outcode; /* outcode of last drawn point */
69 
70  int coord_alloc; /* Allocated size of coordinate database */
71  double *coord; /* Buffer for storing line coordinates in curve_to */
72 
73  int outcode( double x, double y );
74  int exit_outcode( double x, double y );
75  void get_point( double *coords, double t,
76  double x0, double y0,
77  double x1, double y1,
78  double x2, double y2,
79  double x3, double y3 );
80 
81 public:
82 
83  LineClip( cairo_t *cairo );
84  ~LineClip();
85 
86  void set( double xmin, double ymin, double xmax, double ymax );
87  void reset();
88 
89  void move_to( double x, double y );
90  void line_to( double x, double y );
91  void curve_to( double x1, double y1,
92  double x2, double y2,
93  double x3, double y3 );
94  void close_path();
95  void fill();
96 };
97 
98 
99 #endif
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