Java Polygon Rotate rotate(Polygon poly, double theta)

Description

rotate

License

Open Source License

Declaration

public static void rotate(Polygon poly, double theta) 

Method Source Code

//package com.java2s;
/*************************************************************************
    /*from w w  w .  j ava2 s.c om*/
Copyright (C) 2009 Grandite
    
This file is part of Open ModelSphere.
    
Open ModelSphere 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 3 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 
or see http://www.gnu.org/licenses/.
    
You can redistribute and/or modify this particular file even under the
terms of the GNU Lesser General Public License (LGPL) as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
    
You should have received a copy of the GNU Lesser General Public License 
(LGPL) along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 
or see http://www.gnu.org/licenses/.
    
You can reach Grandite at: 
    
20-1220 Lebourgneuf Blvd.
Quebec, QC
Canada  G2K 2G4
    
or
    
open-modelsphere@grandite.com
    
 **********************************************************************/

import java.awt.*;

public class Main {
    public static void rotate(Polygon poly, double theta) {
        double sin = Math.sin(theta);
        double cos = Math.cos(theta);
        for (int i = 0; i < poly.npoints; i++) {
            double x = poly.xpoints[i];
            double y = poly.ypoints[i];
            poly.xpoints[i] = (int) (x * cos - y * sin);
            poly.ypoints[i] = (int) (x * sin + y * cos);
        }
    }
}

Related

1. rotateCW(Polygon polygon, int height)
2. rotatePolygon(Polygon pg, double rotAngle, Point centroid, Polygon original)
3. rotatePolygon(Polygon poly, double degree)