Ptidej-v5.2-master/PADL Serialiser DB4O Tests/rsc/JHotDraw v5.1/src/CH/ifa/draw/standard/OffsetLocator.java
/*
 * @(#)OffsetLocator.java 5.1
 *
 */

package CH.ifa.draw.standard;

import java.awt.Point;
import java.io.IOException;

import CH.ifa.draw.framework.Figure;
import CH.ifa.draw.framework.Locator;
import CH.ifa.draw.util.StorableInput;
import CH.ifa.draw.util.StorableOutput;

/**
 * A locator to offset another Locator.
 * @see Locator
 */
public  class OffsetLocator extends AbstractLocator {

	/*
	 * Serialization support.
	 */
	private static final long serialVersionUID = 2679950024611847621L;
	private int offsetLocatorSerializedDataVersion = 1;

	private Locator fBase;
	private int     fOffsetX;
	private int     fOffsetY;

	public OffsetLocator() {
		fBase = null;
		fOffsetX = 0;
		fOffsetY = 0;
	}

	public OffsetLocator(Locator base) {
		this();
		fBase = base;
	}

	public OffsetLocator(Locator base, int offsetX, int offsetY) {
		this(base);
		fOffsetX = offsetX;
		fOffsetY = offsetY;
	}

	public Point locate(Figure owner) {
		Point p = fBase.locate(owner);
		p.x += fOffsetX;
		p.y += fOffsetY;
		return p;
	}

	public void moveBy(int dx, int dy) {
		fOffsetX += dx;
		fOffsetY += dy;
	}

	public void write(StorableOutput dw) {
		super.write(dw);
		dw.writeInt(fOffsetX);
		dw.writeInt(fOffsetY);
		dw.writeStorable(fBase);
	}

	public void read(StorableInput dr) throws IOException {
		super.read(dr);
		fOffsetX = dr.readInt();
		fOffsetY = dr.readInt();
		fBase = (Locator)dr.readStorable();
	}
}

