src/moon-path.h

   1 /*
   2  * moon-path.h: Path-based API, similar to cairo but without requiring a cairo_context_t
   3  *
   4  * Contact:
   5  *   Moonlight List (moonlight-list@lists.ximian.com)
   6  *
   7  * Copyright 2007, 2008 Novell, Inc. (http://www.novell.com)
   8  *
   9  * See the LICENSE file included with the distribution for details.
  10  *
  11  */
  12
  13 #ifndef __MOON_PATH_H__
  14 #define __MOON_PATH_H__
  15
  16 #include <string.h>
  17 #include <math.h>
  18 #include <glib.h>
  19 #include <cairo.h>
  20
  21 G_BEGIN_DECLS
  22
  23 // http://graphics.stanford.edu/courses/cs248-98-fall/Final/q1.html
  24 #define ARC_TO_BEZIER   0.55228475
  25
  26 typedef struct {
  27         cairo_path_t    cairo;
  28         int allocated;                          /* how many cairo_path_data_t were allocated */
  29 } moon_path;
  30
  31 /* the numbers of cairo_path_data_t required to hold a path containing the matching call */
  32 #define MOON_PATH_MOVE_TO_LENGTH                2
  33 #define MOON_PATH_LINE_TO_LENGTH                2
  34 #define MOON_PATH_CURVE_TO_LENGTH               4
  35 #define MOON_PATH_ELLIPSE_LENGTH                18
  36 #define MOON_PATH_RECTANGLE_LENGTH              9
  37 #define MOON_PATH_ROUNDED_RECTANGLE_LENGTH      27
  38 #define MOON_PATH_CLOSE_PATH_LENGTH             1
  39
  40 // is it true only for arcs or for everything ? if so using the same values ?
  41 // note: lupus noted this suggest SL uses floats, not doubles, internally (MIL?)
  42 #define IS_ZERO(x)      (fabs(x) < 0.000019)
  43 #define IS_TOO_SMALL(x) (fabs(x) < 0.000117)
  44
  45 /*
  46  * These functions are similar to cairo_* functions (with some extra ones) except that they don't require a cairo_context_t
  47  * in order to build a cairo_path_t.
  48  */
  49
  50 moon_path*      moon_path_new (int size);
  51 moon_path*      moon_path_renew (moon_path* path, int size);
  52 void            moon_path_clear (moon_path* path);
  53 void            moon_path_destroy (moon_path* path);
  54 void            moon_get_current_point (moon_path *path, double *x, double *y);
  55 void            moon_move_to (moon_path *path, double x, double y);
  56 void            moon_line_to (moon_path *path, double x, double y);
  57 void            moon_curve_to (moon_path *path, double x1, double y1, double x2, double y2, double x3, double y3);
  58 void            moon_quad_curve_to (moon_path* path, double x1, double y1, double x2, double y2);
  59 void            moon_arc_to (moon_path *path, double width, double height, double angle, gboolean large, gboolean sweep, double ex, double ey);
  60 void            moon_ellipse (moon_path *path, double x, double y, double w, double h);
  61 void            moon_rectangle (moon_path *path, double x, double y, double w, double h);
  62 void            moon_rounded_rectangle (moon_path *path, double x, double y, double w, double h, double radius_x, double radius_y);
  63 void            moon_close_path (moon_path *path);
  64 void            moon_get_origin (moon_path *path, double *ox, double *oy);
  65 void            moon_merge (moon_path *path, moon_path *subpath);
  66
  67 // for debugging purpose
  68 void            cairo_path_display (cairo_path_t *path);
  69 void            moon_path_display (moon_path *path);
  70
  71 G_END_DECLS
  72
  73 #endif