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| typedef GnomeCanvasPoints; GnomeCanvasPoints* gnome_canvas_points_new (int num_points); GnomeCanvasPoints* gnome_canvas_points_ref (GnomeCanvasPoints *points); #define gnome_canvas_points_unref void gnome_canvas_points_free (GnomeCanvasPoints *points); int gnome_canvas_get_miter_points (double x1, double y1, double x2, double y2, double x3, double y3, double width, double *mx1, double *my1, double *mx2, double *my2); void gnome_canvas_get_butt_points (double x1, double y1, double x2, double y2, double width, int project, double *bx1, double *by1, double *bx2, double *by2); double gnome_canvas_polygon_to_point (double *poly, int num_points, double x, double y); void gnome_canvas_render_svp (GnomeCanvasBuf *buf, ArtSVP *svp, guint32 rgba); void gnome_canvas_update_svp (GnomeCanvas *canvas, ArtSVP **p_svp, ArtSVP *new_svp); void gnome_canvas_update_svp_clip (GnomeCanvas *canvas, ArtSVP **p_svp, ArtSVP *new_svp, ArtSVP *clip_svp); void gnome_canvas_item_reset_bounds (GnomeCanvasItem *item); void gnome_canvas_item_update_svp (GnomeCanvasItem *item, ArtSVP **p_svp, ArtSVP *new_svp); void gnome_canvas_item_update_svp_clip (GnomeCanvasItem *item, ArtSVP **p_svp, ArtSVP *new_svp, ArtSVP *clip_svp); void gnome_canvas_item_request_redraw_svp (GnomeCanvasItem *item, const ArtSVP *svp); void gnome_canvas_update_bbox (GnomeCanvasItem *item, int x1, int y1, int x2, int y2); void gnome_canvas_buf_ensure_buf (GnomeCanvasBuf *buf); ArtPathStrokeJoinType gnome_canvas_join_gdk_to_art (GdkJoinStyle gdk_join); ArtPathStrokeCapType gnome_canvas_cap_gdk_to_art (GdkCapStyle gdk_cap); | 
| typedef struct {
	double *coords;
	int num_points;
	int ref_count;
} GnomeCanvasPoints; | 
| GnomeCanvasPoints* gnome_canvas_points_new (int num_points); | 
Creates a structure that should be used to pass an array of points to items.
| GnomeCanvasPoints* gnome_canvas_points_ref (GnomeCanvasPoints *points); | 
Increases the reference count of the specified points structure.
| void gnome_canvas_points_free (GnomeCanvasPoints *points); | 
Decreases the reference count of the specified points structure. If it reaches zero, then the structure is freed.
| int         gnome_canvas_get_miter_points   (double x1,
                                             double y1,
                                             double x2,
                                             double y2,
                                             double x3,
                                             double y3,
                                             double width,
                                             double *mx1,
                                             double *my1,
                                             double *mx2,
                                             double *my2); | 
Given three points forming an angle, computes the coordinates of the inside and outside points of the mitered corner formed by a line of a given width at that angle.
| x1 : | X coordinate of the first point | 
| y1 : | Y coordinate of the first point | 
| x2 : | X coordinate of the second (angle) point | 
| y2 : | Y coordinate of the second (angle) point | 
| x3 : | X coordinate of the third point | 
| y3 : | Y coordinate of the third point | 
| width : | Width of the line | 
| mx1 : | The X coordinate of the first miter point is returned here. | 
| my1 : | The Y coordinate of the first miter point is returned here. | 
| mx2 : | The X coordinate of the second miter point is returned here. | 
| my2 : | The Y coordinate of the second miter point is returned here. | 
| Returns : | FALSE if the angle is less than 11 degrees (this is the same threshold as X uses. If this occurs, the return points are not modified. Otherwise, returns TRUE. | 
| void        gnome_canvas_get_butt_points    (double x1,
                                             double y1,
                                             double x2,
                                             double y2,
                                             double width,
                                             int project,
                                             double *bx1,
                                             double *by1,
                                             double *bx2,
                                             double *by2); | 
Computes the butt points of a line segment.
| x1 : | X coordinate of first point in the line | 
| y1 : | Y cooordinate of first point in the line | 
| x2 : | X coordinate of second point (endpoint) of the line | 
| y2 : | Y coordinate of second point (endpoint) of the line | 
| width : | Width of the line | 
| project : | Whether the butt points should project out by width/2 distance | 
| bx1 : | X coordinate of first butt point is returned here | 
| by1 : | Y coordinate of first butt point is returned here | 
| bx2 : | X coordinate of second butt point is returned here | 
| by2 : | Y coordinate of second butt point is returned here | 
| double      gnome_canvas_polygon_to_point   (double *poly,
                                             int num_points,
                                             double x,
                                             double y); | 
Computes the distance between a point and a polygon.
| poly : | Vertices of the polygon. X coordinates are in the even indices, and Y coordinates are in the odd indices | 
| num_points : | Number of points in the polygon | 
| x : | X coordinate of the point | 
| y : | Y coordinate of the point | 
| Returns : | The distance from the point to the polygon, or zero if the point is inside the polygon. | 
| void gnome_canvas_render_svp (GnomeCanvasBuf *buf, ArtSVP *svp, guint32 rgba); | 
Render the svp over the buf.
| void        gnome_canvas_update_svp         (GnomeCanvas *canvas,
                                             ArtSVP **p_svp,
                                             ArtSVP *new_svp); | 
Sets the svp to the new value, requesting repaint on what's changed. This function takes responsibility for freeing new_svp.
| void        gnome_canvas_update_svp_clip    (GnomeCanvas *canvas,
                                             ArtSVP **p_svp,
                                             ArtSVP *new_svp,
                                             ArtSVP *clip_svp); | 
Sets the svp to the new value, clipping if necessary, and requesting repaint on what's changed. This function takes responsibility for freeing new_svp.
| void gnome_canvas_item_reset_bounds (GnomeCanvasItem *item); | 
Resets the bounding box of a canvas item to an empty rectangle.
| void        gnome_canvas_item_update_svp    (GnomeCanvasItem *item,
                                             ArtSVP **p_svp,
                                             ArtSVP *new_svp); | 
Sets the svp to the new value, requesting repaint on what's changed. This function takes responsibility for freeing new_svp. This routine also adds the svp's bbox to the item's.
| void        gnome_canvas_item_update_svp_clip
                                            (GnomeCanvasItem *item,
                                             ArtSVP **p_svp,
                                             ArtSVP *new_svp,
                                             ArtSVP *clip_svp); | 
Sets the svp to the new value, clipping if necessary, and requesting repaint on what's changed. This function takes responsibility for freeing new_svp.
| void        gnome_canvas_item_request_redraw_svp
                                            (GnomeCanvasItem *item,
                                             const ArtSVP *svp); | 
Request redraw of the svp if in aa mode, or the entire item in in xlib mode.
| void        gnome_canvas_update_bbox        (GnomeCanvasItem *item,
                                             int x1,
                                             int y1,
                                             int x2,
                                             int y2); | 
Sets the bbox to the new value, requesting full repaint.
| ArtPathStrokeJoinType gnome_canvas_join_gdk_to_art
                                            (GdkJoinStyle gdk_join); | 
Convert from GDK line join specifier to libart.
| ArtPathStrokeCapType gnome_canvas_cap_gdk_to_art
                                            (GdkCapStyle gdk_cap); | 
Convert from GDK line cap specifier to libart.