polylinelocator.java

来自「开源（Open Source）项目JHotDraw的文档和源程序」· Java 代码 · 共 35 行

/*
 * @(#)PolyLineLocator.java 5.2
 *
 */

package CH.ifa.draw.figures;

import java.awt.*;
import java.io.IOException;
import CH.ifa.draw.framework.*;
import CH.ifa.draw.standard.*;
import CH.ifa.draw.util.*;

/**
 * A poly line figure consists of a list of points.
 * It has an optional line decoration at the start and end.
 *
 * @see LineDecoration
 */
class PolyLineLocator extends AbstractLocator {
    int fIndex;

    public PolyLineLocator(int index) {
        fIndex = index;
    }

    public Point locate(Figure owner) {
        PolyLineFigure plf = (PolyLineFigure)owner;
        // guard against changing PolyLineFigures -> temporary hack
        if (fIndex < plf.pointCount())
            return ((PolyLineFigure)owner).pointAt(fIndex);
        return new Point(0, 0);
    }
}