/*
* Phys2D - a 2D physics engine based on the work of Erin Catto.
*
* This source is provided under the terms of the BSD License.
*
* Copyright (c) 2006, Phys2D
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* * Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of the Phys2D/New Dawn Software nor the names of
* its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*/
package net.phys2d.raw.shapes;
import net.phys2d.math.MathUtil;
import net.phys2d.math.Matrix2f;
import net.phys2d.math.ROVector2f;
import net.phys2d.math.Vector2f;
/**
* A simple box in the engine - defined by a width and height
*
* @author Kevin Glass
*/
public strictfp class Box extends AbstractShape implements DynamicShape {
/** The size of the box */
private Vector2f size = new Vector2f();
/**
* Create a box in the simulation
*
* @param width The width of a box
* @param height The hieght of the box
*/
public Box(float width, float height) {
super();
size.set(width,height);
bounds = new AABox(size.length(), size.length());
}
/**
* Get the size of this box
*
* @return The size of this box
*/
public ROVector2f getSize() {
return size;
}
/**
* @see net.phys2d.raw.shapes.Shape#getSurfaceFactor()
*/
public float getSurfaceFactor() {
float x = size.getX();
float y = size.getY();
return (x * x + y * y);
}
/**
* Get the current positon of a set of points
*
* @param pos The centre of the box
* @param rotation The rotation of the box
* @return The points building up a box at this position and rotation
*/
public Vector2f[] getPoints(ROVector2f pos, float rotation) {
Matrix2f R = new Matrix2f(rotation);
Vector2f[] pts = new Vector2f[4];
ROVector2f h = MathUtil.scale(getSize(),0.5f);
pts[0] = MathUtil.mul(R, new Vector2f(-h.getX(), -h.getY()));
pts[0].add(pos);
pts[1] = MathUtil.mul(R, new Vector2f(h.getX(), -h.getY()));
pts[1].add(pos);
pts[2] = MathUtil.mul(R, new Vector2f( h.getX(), h.getY()));
pts[2].add(pos);
pts[3] = MathUtil.mul(R, new Vector2f(-h.getX(), h.getY()));
pts[3].add(pos);
return pts;
}
}