SmallRect.java

/*******************************************************************************
* Copyright (c) 2011 Stephan Schwiebert. All rights reserved. This program and
* the accompanying materials are made available under the terms of the Eclipse
* Public License v1.0 which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
* <p/>
* Contributors: Stephan Schwiebert - initial API and implementation
*******************************************************************************/
package org.eclipse.zest.cloudio.util;

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Rectangle;

/**
 * A custom variation of a {@link Rectangle}, which stores
 * the required values as short instead of int, thus saving
 * some space. 
 * 
 * @author sschwieb
 *
 */
public class SmallRect {
	
	final short x, y, width, height;

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + height;
		result = prime * result + width;
		result = prime * result + x;
		result = prime * result + y;
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		SmallRect other = (SmallRect) obj;
		if (height != other.height)
			return false;
		if (width != other.width)
			return false;
		if (x != other.x)
			return false;
		if (y != other.y)
			return false;
		return true;
	}

	public SmallRect(int x, int y, int width, int height) {
		this.x = (short) x;
		this.y = (short) y;
		this.width = (short) width;
		this.height = (short) height;
	}

	public boolean intersects(SmallRect rect) {
		if (rect == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
		return rect == this || intersects (rect.x, rect.y, rect.width, rect.height);
	}
	
	public boolean intersects (final int x, final int y, final int width, final int height) {
		return (x < this.x + this.width) && (y < this.y + this.height) &&
			(x + width > this.x) && (y + height > this.y);
	}

	public String toString () {
		return "Rectangle {" + x + ", " + y + ", " + width + ", " + height + "}";
	}
	
}