Gimp/app/tools/transform_core.h

/* The GIMP -- an image manipulation program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * 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 __TRANSFORM_CORE_H__
#define __TRANSFORM_CORE_H__


/* buffer sizes for scaling information strings (for the info dialog) */
#define MAX_INFO_BUF   40
#define TRAN_INFO_SIZE  8

enum BoundingBox
{
  X0, Y0, X1, Y1, X2, Y2, X3, Y3
};

typedef gdouble TranInfo[TRAN_INFO_SIZE];

typedef TileManager * (* TransformFunc) (Tool           *tool,
					 GDisplay       *gdisp,
					 TransformState  state);


struct _TransformCore
{
  GimpDrawTool    parent_instance;         /*  Core select object          */

  gint            startx;       /*  starting x coord            */
  gint            starty;       /*  starting y coord            */

  gint            curx;         /*  current x coord             */
  gint            cury;         /*  current y coord             */

  gint            lastx;        /*  last x coord                */
  gint            lasty;        /*  last y coord                */

  gint            state;        /*  state of buttons and keys   */

  gint            x1, y1;       /*  upper left hand coordinate  */
  gint            x2, y2;       /*  lower right hand coords     */
  gint		  cx, cy;	/*  center point (for rotation) */

  gdouble         tx1, ty1;     /*  transformed coords          */
  gdouble         tx2, ty2;     /*                              */
  gdouble         tx3, ty3;     /*                              */
  gdouble         tx4, ty4;     /*                              */
  gdouble	  tcx, tcy;	/*                              */

  gint            sx1, sy1;     /*  transformed screen coords   */
  gint            sx2, sy2;     /*  position of four handles    */
  gint            sx3, sy3;     /*                              */
  gint            sx4, sy4;     /*                              */
  gint            scx, scy;     /*  and center for rotation     */

  GimpMatrix3     transform;    /*  transformation matrix       */
  TranInfo        trans_info;   /*  transformation info         */

  TileManager    *original;     /*  pointer to original tiles   */

  TransformFunc   trans_func;   /*  transformation function     */

  TransformAction function;     /*  current tool activity       */

  gboolean        interactive;  /*  tool is interactive         */
  gboolean        bpressed;     /*  Bug work around make sure we have 
				 *  a button pressed before we deal with
				 *  motion events. ALT.
				 */
  gint		  ngx, ngy;	/*  number of grid lines in original
				 *  x and y directions
				 */
  gdouble	 *grid_coords;	/*  x and y coordinates of the grid
				 *  endpoints (a total of (ngx+ngy)*2
				 *  coordinate pairs)
				 */
  gdouble	 *tgrid_coords; /*  transformed grid_coords     */
};


/*  Special undo type  */
typedef struct _TransformUndo TransformUndo;

struct _TransformUndo
{
  gint         tool_ID;
  gint         tool_type;
  TranInfo     trans_info;
  TileManager *original;
  gpointer     path_undo;
};


/*  make this variable available to all  */
extern InfoDialog * transform_info;

/*  transform tool action functions  */
void          transform_core_button_press           (Tool           *tool,
						     GdkEventButton *bevent,
						     GDisplay       *gdisp);
void          transform_core_button_release         (Tool           *tool,
						     GdkEventButton *bevent,
						     GDisplay       *gdisp);
void          transform_core_motion                 (Tool           *tool,
						     GdkEventMotion *mevent,
						     GDisplay       *gdisp);
void          transform_core_cursor_update          (Tool           *tool,
						     GdkEventMotion *mevent,
						     GDisplay       *gdisp);
void          transform_core_control                (Tool           *tool,
					             ToolAction      tool_action,
						     GDisplay       *gdisp);

/*  transform tool functions  */
/* make PDB compile: ToolType doesn't exist any more 
Tool        * transform_core_new                    (ToolType        tool_type,
						     gboolean        interactive);
*/
void          transform_core_free                   (Tool           *tool);
void          transform_core_draw                   (Tool           *tool);
void          transform_core_no_draw                (Tool           *tool);
void          transform_core_transform_bounding_box (Tool           *tool);
void          transform_core_reset                  (Tool           *tool,
						     GDisplay       *gdisp);
void	      transform_core_grid_density_changed   (void);
void	      transform_core_showpath_changed       (gint            type);

/*  transform functions  */
TileManager * transform_core_do    (GimpImage        *gimage,
				    GimpDrawable     *drawable,
				    TileManager      *float_tiles,
				    gboolean          interpolation,
				    GimpMatrix3       matrix,
				    GimpProgressFunc  progress_callback,
				    gpointer          progress_data);
TileManager * transform_core_cut   (GimpImage        *gimage,
				    GimpDrawable     *drawable,
				    gboolean         *new_layer);
gboolean      transform_core_paste (GimpImage        *gimage,
				    GimpDrawable     *drawable,
				    TileManager      *tiles,
				    gboolean          new_layer);


#endif  /*  __TRANSFORM_CORE_H__  */