j2525.java

openmap java写的开源数字地图程序. 用applet实现,可以像google map 那样放大缩小地图.

// **********************************************************************
// 
// <copyright>
// 
//  BBN Technologies
//  10 Moulton Street
//  Cambridge, MA 02138
//  [phone]
// 
//  Copyright (C) BBNT Solutions LLC. All rights reserved.
// 
// </copyright>
// **********************************************************************
// 
// $Source:
// /cvs/distapps/openmap/src/corba/com/bbn/openmap/layer/specialist/J2525.java,v
// $
// $RCSfile: J2525.java,v $
// $Revision: 1.2.2.1 $
// $Date: 2004/10/14 18:26:30 $
// $Author: dietrick $
// 
// **********************************************************************

package com.bbn.openmap.layer.specialist;

import com.bbn.openmap.CSpecialist.U2525SymbolPackage.E2525Symbol;
import com.bbn.openmap.omGraphics.*;
import com.bbn.openmap.proj.Projection;

import java.awt.Graphics;
import java.awt.Point;
import java.awt.image.ImageObserver;
import javax.swing.ImageIcon;

public class J2525 extends OMGraphic implements JObjectHolder {

    protected transient com.bbn.openmap.CSpecialist.EComp object = null;

    E2525Symbol e2525 = null;
    Point point1;
    ImageIcon bitmap;
    ImageObserver observer;

    public J2525(E2525Symbol e2525) {
        super();
        JGraphic.fillOMGraphicParams(this, e2525.egraphic);
    }

    public void setObject(com.bbn.openmap.CSpecialist.EComp aObject) {
        object = aObject;
    }

    public com.bbn.openmap.CSpecialist.EComp getObject() {
        return object;
    }

    /** generate() - prepares the graphics for rendering. */
    public boolean generate(Projection proj) {
        setNeedToRegenerate(false);

        switch (renderType) {
        case RENDERTYPE_XY:
            break;
        case RENDERTYPE_OFFSET:
            break;
        case RENDERTYPE_LATLON:
            point1 = proj.forward(e2525.ll1.lat, e2525.ll1.lon);

            // I'm cheating and forcing all 2525 symbols to be
            // represented by a
            // single bitmap. Ideally, we'd use a ported version of
            // the GSD
            // library to generate an appropriate bitmap for us.
            bitmap = new ImageIcon("plus.bm");
            break;
        case RENDERTYPE_UNKNOWN:
            System.err.println("J2525.generate: invalid RenderType");
            return false;
        }
        return true;
    }

    /** render() - renders the 2525 symbol. */
    public void render(Graphics g) {
        if (g == null) {
            System.err.println("J2525.render: can't render null Graphics");
            return;
        }
        g.setColor(getDisplayColor());

        if (bitmap != null) {
            System.out.println("\n\nHelp!!!!: J2525 can't draw an image!");
            // Need to update this to JFC, but need an
            // ImageObserver...
            //g.drawImage(bitmap, point1.x, point1.y);
        } else {
            System.err.println("J2525.render: ignoring null bitmap");
        }

        // I'm cheating and drawing in the most-used annotation
        // (bottom1),
        // and ignoring all the others.

        // Determine proper positioning of the bottom1 label.
        //     netscape.application.Font f =
        // netscape.application.Font.defaultFont();
        //     netscape.application.FontMetrics fm = f.fontMetrics();
        //     netscape.application.Size sz =
        // fm.stringSize(e2525.bottom1);
        //     int x,y;
        //     x = point1.x + (bitmap.width() / 2);
        //     y = point1.y + bitmap.height();
        //     x -= sz.width/2;
        //     y += sz.height;

        //     g.setFont(f);
        //     g.drawString(e2525.bottom1, x, y);
        int x = point1.x + (bitmap.getImage().getWidth(observer) / 2);
        int y = point1.y + bitmap.getImage().getHeight(observer);
        int w = g.getFontMetrics().stringWidth(e2525.bottom1);
        int h = g.getFontMetrics().getHeight();
        x -= w / 2;
        y += h;

        g.drawString(e2525.bottom1, x, y);
    }

    /**
     * distance() - returns the shortest distance from the 2525 symbol
     * to an XY-point
     */
    public float distance(int x, int y) {
        float distance = Float.POSITIVE_INFINITY;
        return distance;
    }

    public void update(
                       com.bbn.openmap.CSpecialist.GraphicPackage.GF_update update) {
        JGraphic.update((JObjectHolder) this, update);
    }

} // class J2525