/*
 *        x_rotate.cc
 *        Rotate and scale a group of objects
 *        AYM 1998-02-07
 */


/*
This file is part of Yadex.

Yadex incorporates code from DEU 5.21 that was put in the public domain in
1994 by Raphaël Quinet and Brendon Wyber.

The rest of Yadex is Copyright © 1997-2003 André Majorel and others.

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.
*/


#include "yadex.h"
#include <math.h>
#include "l_vertices.h"
#include "levels.h"
#include "objid.h"
#include "s_vertices.h"
#include "selectn.h"
#include "t_centre.h"
#include "v_centre.h"
#include "x_rotate.h"


/*
   move (x, y) to a new position: rotate and scale around (0, 0)
*/

#if 0
inline void RotateAndScaleCoords(int *x, int *y, double angle, double scale)
{
    double r, theta;

    r = hypot((double) *x, (double) *y);
    theta = atan2((double) *y, (double) *x);
    *x = (int) (r * scale * cos(theta + angle) + 0.5);
    *y = (int) (r * scale * sin(theta + angle) + 0.5);
}
#endif


/*
   rotate and scale a group of objects around the centre of gravity
*/

void RotateAndScaleObjects(int objtype, SelPtr obj, double angle, double scale)        // SWAP!
{
    int dx, dy;
    int centerx, centery;
    SelPtr cur, vertices;

    if (obj == NULL)
        return;

    switch (objtype)
    {
    case OBJ_THINGS:
        centre_of_things(obj, &centerx, &centery);
        for (cur = obj; cur; cur = cur->next)
        {
            dx = Things[cur->objnum].xpos - centerx;
            dy = Things[cur->objnum].ypos - centery;
            RotateAndScaleCoords(&dx, &dy, angle, scale);
            Things[cur->objnum].xpos = centerx + dx;
            Things[cur->objnum].ypos = centery + dy;
        }
        MadeChanges = 1;
        break;

    case OBJ_VERTICES:
        centre_of_vertices(obj, &centerx, &centery);
        for (cur = obj; cur; cur = cur->next)
        {
            dx = Vertices[cur->objnum].x - centerx;
            dy = Vertices[cur->objnum].y - centery;
            RotateAndScaleCoords(&dx, &dy, angle, scale);
            Vertices[cur->objnum].x = (centerx + dx + /*4 */ 2) & ~ /*7 */ 3;
            Vertices[cur->objnum].y = (centery + dy + /*4 */ 2) & ~ /*7 */ 3;
        }
        MadeChanges = 1;
        MadeMapChanges = 1;
        break;

    case OBJ_LINEDEFS:
        vertices = list_vertices_of_linedefs(obj);
        RotateAndScaleObjects(OBJ_VERTICES, vertices, angle, scale);
        ForgetSelection(&vertices);
        break;

    case OBJ_SECTORS:
        vertices = list_vertices_of_sectors(obj);
        RotateAndScaleObjects(OBJ_VERTICES, vertices, angle, scale);
        ForgetSelection(&vertices);
        break;
    }
}