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/* 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__
#include "info_dialog.h"
#include "draw_core.h"
#include "temp_buf.h"
/* possible scaling functions */
#define CREATING 0
#define HANDLE_1 1
#define HANDLE_2 2
#define HANDLE_3 3
#define HANDLE_4 4
/* the different states that the transformation function can be called with */
#define INIT 0
#define MOTION 1
#define RECALC 2
#define FINISH 3
/* buffer sizes for scaling information strings (for the info dialog) */
#define MAX_INFO_BUF 12
#define TRAN_INFO_SIZE 8
/* control whether the transform tool draws a bounding box */
#define NON_INTERACTIVE 0
#define INTERACTIVE 1
typedef double Vector[3];
typedef Vector Matrix[3];
typedef double TranInfo[TRAN_INFO_SIZE];
typedef void * (* TransformFunc) (Tool *, void *, int);
typedef struct _transform_core TransformCore;
struct _transform_core
{
DrawCore * core; /* Core select object */
int startx; /* starting x coord */
int starty; /* starting y coord */
int curx; /* current x coord */
int cury; /* current y coord */
int lastx; /* last x coord */
int lasty; /* last y coord */
int state; /* state of buttons and keys */
int x1, y1; /* upper left hand coordinate */
int x2, y2; /* lower right hand coords */
double tx1, ty1; /* transformed coords */
double tx2, ty2; /* */
double tx3, ty3; /* */
double tx4, ty4; /* */
int sx1, sy1; /* transformed screen coords */
int sx2, sy2; /* position of four handles */
int sx3, sy3; /* */
int sx4, sy4; /* */
Matrix transform; /* transformation matrix */
TranInfo trans_info; /* transformation info */
TileManager * original; /* pointer to original tiles */
TransformFunc trans_func; /* transformation function */
int function; /* current tool activity */
int interactive; /* tool is interactive */
int bpressed; /* Bug work around make sure we have
* a button pressed before we deal with
* motion events. ALT.
*/
};
/* Special undo type */
typedef struct _transform_undo TransformUndo;
struct _transform_undo
{
int tool_ID;
int tool_type;
TranInfo trans_info;
int first;
TileManager * original;
};
/* make this variable available to all */
extern InfoDialog * transform_info;
/* transform tool action functions */
void transform_core_button_press (Tool *, GdkEventButton *, gpointer);
void transform_core_button_release (Tool *, GdkEventButton *, gpointer);
void transform_core_motion (Tool *, GdkEventMotion *, gpointer);
void transform_core_cursor_update (Tool *, GdkEventMotion *, gpointer);
void transform_core_control (Tool *, int, gpointer);
/* transform tool functions */
void transform_core_draw (Tool *);
void transform_core_no_draw (Tool *);
Tool * transform_core_new (int, int);
void transform_core_free (Tool *);
void transform_core_reset (Tool *, void *);
/* transform functions */
TileManager * transform_core_do (GImage *, GimpDrawable *, TileManager *, int, Matrix);
TileManager * transform_core_cut (GImage *, GimpDrawable *, int *);
Layer * transform_core_paste (GImage *, GimpDrawable *, TileManager *, int);
/* matrix functions */
void transform_bounding_box (Tool *);
void transform_point (Matrix, double, double, double *, double *);
void mult_matrix (Matrix, Matrix);
void identity_matrix (Matrix);
void translate_matrix (Matrix, double, double);
void scale_matrix (Matrix, double, double);
void rotate_matrix (Matrix, double);
void xshear_matrix (Matrix, double);
void yshear_matrix (Matrix, double);
#endif /* __TRANSFORM_CORE_H__ */
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