GeometryVerifierTest.java

//    Asteroid Push - A game featuring selfmade spaceships and pompous physics
//    Copyright (C) 2013  Christian Meyer, Silvan Wegmann
//
//    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 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, see <http://www.gnu.org/licenses/>.

package org.codecranachan.asteroidpush.utils;

import static org.junit.Assert.*;

import org.codecranachan.asteroidpush.utils.GeometryVerifier;
import org.jbox2d.collision.shapes.PolygonShape;
import org.jbox2d.common.Vec2;
import org.junit.Test;

public class GeometryVerifierTest {
   @Test
   public void testIsWoundCorrectly() {
      // jbox2d updated the PolygonShape.set() method to automatically fix
      // miswound or malformed shapes. Thus the GeometryVerifier is essentially
      // no longer needed.      
      
      PolygonShape shape = new PolygonShape();

      Vec2 boxVertices[] = new Vec2[] {
            new Vec2(0.25f, 0.25f),
            new Vec2(-0.25f, 0.25f),
            new Vec2(-0.25f, -0.25f),
            new Vec2(0.25f, -0.25f)
      };
      shape.set(boxVertices, boxVertices.length);
      assertTrue(GeometryVerifier.IsWoundCorrectly(shape));

      Vec2 miswoundBoxVertices[] = new Vec2[] {
            new Vec2(0.25f, -0.25f),
            new Vec2(-0.25f, -0.25f),
            new Vec2(-0.25f, 0.25f),
            new Vec2(0.25f, 0.25f)
      };
      shape.set(miswoundBoxVertices, miswoundBoxVertices.length);
      assertTrue(GeometryVerifier.IsWoundCorrectly(shape));

      Vec2 potatoVertices[] = new Vec2[] {
            new Vec2(4.0f, 4.0f),
            new Vec2(5.0f, 3.0f),
            new Vec2(4.0f, 1.0f),
            new Vec2(2.0f, 2.0f),
            new Vec2(3.0f, 3.0f),
            new Vec2(2.0f, 5.0f)
      };
      shape.set(potatoVertices, potatoVertices.length);
      assertTrue(GeometryVerifier.IsWoundCorrectly(shape));
   }
}