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/*
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;
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)
{
TRACE;
*x-=cx;
*y-=cy;
*x=(int)((*x)*sc);
*y=(int)((*y)*sc);
*x+=cx;
*y+=cy;
}
/* END OF FILE */
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