/*

    viDOOM - level editor for DOOM

    Copyright (C) 2000  Ian Cowburn (ianc@noddybox.demon.co.uk)

    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

    -------------------------------------------------------------------------

    Editor scale and rotation routines

*/
static const char rcs_id[]="$Id$";

#include "config.h"
#include "globals.h"
#include "editvar.h"

#include <math.h>


/* ---------------------------------------- ROTATION ROUTINES
*/
void Rotate(int cx,int cy,int *x,int *y, double ang)
{
    double r,t;

    VIDOOM_TRACE;

    ang=RAD(ang);

    *x-=cx;
    *y-=cy;

    r=hypot((double)*x,(double)*y);
    t=atan2((double)*y,(double)*x);

    *x=(int)(r*cos(t+ang)+0.5);
    *y=(int)(r*sin(t+ang)+0.5);

    *x+=cx;
    *y+=cy;
}


/* ---------------------------------------- SCALE ROUTINES
*/
void Scale(int cx,int cy,int *x,int *y, double sc)
{
    VIDOOM_TRACE;

    *x-=cx;
    *y-=cy;

    *x=(int)((*x)*sc);
    *y=(int)((*y)*sc);

    *x+=cx;
    *y+=cy;
}


/* END OF FILE */