gimp/app/path_curves.h

/* The GIMP -- an image manipulation program
 *
 * This file Copyright (C) 1999 Simon Budig
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#ifndef __PATH_CURVES_H__
#define __PATH_CURVES_H__

#include <gdk/gdk.h>
#include "path_toolP.h"


/*
 * This function is to get a set of npoints different coordinates for
 * the range from start to end (each in the range from 0 to 1 and
 * start < end).
 * returns the number of created coords. Make sure that the points-
 * Array is allocated.
 */

typedef guint (*PathGetPointsFunc) (PathTool *path_tool,
                        	    PathSegment *segment,
				    GdkPoint *points,
				    guint npoints,
				    gdouble start,
				    gdouble end);

typedef void (*PathGetPointFunc) (PathTool *path_tool,
		       		  PathSegment *segment,
		       		  gdouble position,
		       		  gdouble *x,
		       		  gdouble *y);

typedef void (*PathDrawHandlesFunc) (Tool *tool,
			  	     PathSegment *segment);
			  
typedef void (*PathDrawSegmentFunc) (Tool *tool,
			  	     PathSegment *segment);
			  

typedef gdouble (*PathOnSegmentFunc) (Tool *tool,
				      PathSegment *segment,
				      gint x,
				      gint y,
				      gint halfwidth,
				      gint *distance);

typedef void (*PathDragSegmentFunc) (PathTool *path_tool,
				     PathSegment *segment,
				     gdouble position,
				     gdouble dx,
				     gdouble dy);

typedef gint (*PathOnHandlesFunc) (PathTool *path_tool,
				   PathSegment *segment,
				   gdouble x,
				   gdouble y,
				   gdouble halfwidth);

typedef void (*PathDragHandleFunc) (PathTool *path_tool,
				    PathSegment *segment,
				    gdouble dx,
				    gdouble dy,
				    gint handle_id);

typedef PathSegment * (*PathInsertAnchorFunc) (PathTool *path_tool,
					       PathSegment *segment,
					       gdouble position);

typedef void (*PathUpdateSegmentFunc) (PathTool *path_tool,
			    	       PathSegment *segment);

typedef void (*PathFlipSegmentFunc) (PathSegment *segment);

typedef void (*PathInitSegmentFunc) (PathSegment *segment);

typedef void (*PathCleanupSegmentFunc) (PathSegment *segment);

typedef struct {
   PathGetPointsFunc      get_points;
   PathGetPointFunc       get_point;
   PathDrawHandlesFunc    draw_handles;
   PathDrawSegmentFunc    draw_segment;
   PathOnSegmentFunc      on_segment;
   PathDragSegmentFunc    drag_segment;
   PathOnHandlesFunc      on_handles;
   PathDragHandleFunc     drag_handle;
   PathInsertAnchorFunc   insert_anchor;
   PathUpdateSegmentFunc  update_segment;
   PathFlipSegmentFunc    flip_segment;
   PathInitSegmentFunc    init_segment;
   PathCleanupSegmentFunc cleanup_segment;
} CurveDescription;


guint
path_curve_get_points (PathTool *path_tool,
		       PathSegment *segment,
		       GdkPoint *points,
		       guint npoints,
		       gdouble start,
		       gdouble end);

void
path_curve_get_point (PathTool *path_tool,
		      PathSegment *segment,
		      gdouble position,
		      gdouble *x,
		      gdouble *y);

void
path_curve_draw_handles (Tool *tool,
			 PathSegment *segment);
			  
void
path_curve_draw_segment (Tool *tool,
			 PathSegment *segment);
			  

gdouble
path_curve_on_segment (Tool *tool,
		       PathSegment *segment,
		       gint x,
		       gint y,
		       gint halfwidth,
		       gint *distance);

void
path_curve_drag_segment (PathTool *path_tool,
			 PathSegment *segment,
			 gdouble position,
			 gdouble dx,
			 gdouble dy);

gint
path_curve_on_handle (PathTool *path_tool,
		      PathSegment *segment,
		      gdouble x,
		      gdouble y,
		      gdouble halfwidth);

void
path_curve_drag_handle (PathTool *path_tool,
			PathSegment *segment,
			gdouble dx,
			gdouble dy,
			gint handle_id);

PathSegment *
path_curve_insert_anchor (PathTool *path_tool,
			  PathSegment *segment,
			  gdouble position);

void
path_curve_update_segment (PathTool *path_tool,
			   PathSegment *segment);

void
path_curve_flip_segment (PathSegment *segment);

void
path_curve_init_segment (PathSegment *segment);

void
path_curve_cleanup_segment (PathSegment *segment);










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#endif /* __PATH_CURVES_H__ */