roundrectanglefigure.java

开源（Open Source）项目JHotDraw的文档和源程序

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

package CH.ifa.draw.figures;

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


/**
 * A round rectangle figure.
 */
public class RoundRectangleFigure extends AttributeFigure {

    private Rectangle   fDisplayBox;
    private int         fArcWidth;
    private int         fArcHeight;
    private static final int DEFAULT_ARC = 8;

    /*
     * Serialization support.
     */
    private static final long serialVersionUID = 7907900248924036885L;
    private int roundRectangleSerializedDataVersion = 1;

    public RoundRectangleFigure() {
        this(new Point(0,0), new Point(0,0));
        fArcWidth = fArcHeight = DEFAULT_ARC;
    }

    public RoundRectangleFigure(Point origin, Point corner) {
        basicDisplayBox(origin,corner);
        fArcWidth = fArcHeight = DEFAULT_ARC;
    }

    public void basicDisplayBox(Point origin, Point corner) {
        fDisplayBox = new Rectangle(origin);
        fDisplayBox.add(corner);
    }

    /**
     * Sets the arc's witdh and height.
     */
    public void setArc(int width, int height) {
        willChange();
        fArcWidth = width;
        fArcHeight = height;
        changed();
    }

    /**
     * Gets the arc's width and height.
     */
    public Point getArc() {
        return new Point(fArcWidth, fArcHeight);
    }

    public Vector handles() {
        Vector handles = new Vector();
        BoxHandleKit.addHandles(this, handles);

        handles.addElement(new RadiusHandle(this));

        return handles;
    }

    public Rectangle displayBox() {
        return new Rectangle(
            fDisplayBox.x,
            fDisplayBox.y,
            fDisplayBox.width,
            fDisplayBox.height);
    }

    protected void basicMoveBy(int x, int y) {
        fDisplayBox.translate(x,y);
    }

    public void drawBackground(Graphics g) {
        Rectangle r = displayBox();
        g.fillRoundRect(r.x, r.y, r.width, r.height, fArcWidth, fArcHeight);
    }

    public void drawFrame(Graphics g) {
        Rectangle r = displayBox();
        g.drawRoundRect(r.x, r.y, r.width-1, r.height-1, fArcWidth, fArcHeight);
    }

    public Insets connectionInsets() {
        return new Insets(fArcHeight/2, fArcWidth/2, fArcHeight/2, fArcWidth/2);
    }

    public Connector connectorAt(int x, int y) {
        return new ShortestDistanceConnector(this); // just for demo purposes
    }

    public void write(StorableOutput dw) {
        super.write(dw);
        dw.writeInt(fDisplayBox.x);
        dw.writeInt(fDisplayBox.y);
        dw.writeInt(fDisplayBox.width);
        dw.writeInt(fDisplayBox.height);
        dw.writeInt(fArcWidth);
        dw.writeInt(fArcHeight);
    }

    public void read(StorableInput dr) throws IOException {
        super.read(dr);
        fDisplayBox = new Rectangle(
            dr.readInt(),
            dr.readInt(),
            dr.readInt(),
            dr.readInt());
        fArcWidth = dr.readInt();
        fArcHeight = dr.readInt();
    }

}