cgmdisplay.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> Copyright 1997-2003 BBNT Solutions, LLC under
 * sponsorship of the Defense Advanced Research Projects Agency
 * (DARPA).
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the Cougaar Open Source License as
 * published by DARPA on the Cougaar Open Source Website
 * (www.cougaar.org).
 * 
 * THE COUGAAR SOFTWARE AND ANY DERIVATIVE SUPPLIED BY LICENSOR IS
 * PROVIDED 'AS IS' WITHOUT WARRANTIES OF ANY KIND, WHETHER EXPRESS OR
 * IMPLIED, INCLUDING (BUT NOT LIMITED TO) ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND WITHOUT
 * ANY WARRANTIES AS TO NON-INFRINGEMENT. IN NO EVENT SHALL COPYRIGHT
 * HOLDER BE LIABLE FOR ANY DIRECT, SPECIAL, INDIRECT OR CONSEQUENTIAL
 * DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE OF DATA OR PROFITS,
 * TORTIOUS CONDUCT, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THE COUGAAR SOFTWARE. </copyright>
 */
package com.bbn.openmap.dataAccess.cgm;

import java.awt.*;
import java.awt.event.*;
import java.io.*;

public class CGMDisplay {
    Graphics G;

    protected double X = 0, Y = 0;
    protected double DX = 1, DY = 1;
    protected int W, H;
    protected CGM Cgm;
    Color FillColor = Color.black, EdgeColor = Color.black,
            LineColor = Color.black, TextColor = Color.black;
    boolean Filled = true, Edge = true;
    int TextSize = 10;
    protected int Extent[] = { -30000, -30000, 30000, 30000 };

    public CGMDisplay(CGM cgm) {
        int extent[] = cgm.extent();
        if (extent != null)
            Extent = extent;
        Cgm = cgm;
    }

    public void paint(Graphics g) {
        G = g;
        Cgm.paint(this);
    }

    public int x(int x) {
        return W + (int) (X + x * DX);
    }

    public int y(int y) {
        return H - (int) (Y + y * DY);
    }

    public Graphics graphics() {
        return G;
    }

    public void setFillColor(Color c) {
        FillColor = c;
    }

    public Color getFillColor() {
        return FillColor;
    }

    public void setFilled(boolean flag) {
        Filled = flag;
    }

    public boolean getFilled() {
        return Filled;
    }

    public void setEdgeColor(Color c) {
        EdgeColor = c;
    }

    public Color getEdgeColor() {
        return EdgeColor;
    }

    public void setEdge(boolean flag) {
        Edge = flag;
    }

    public boolean getEdge() {
        return Edge;
    }

    public void setLineColor(Color c) {
        LineColor = c;
    }

    public Color getLineColor() {
        return LineColor;
    }

    public void setTextColor(Color c) {
        TextColor = c;
    }

    public Color getTextColor() {
        return TextColor;
    }

    public void setTextSize(int h) {
        TextSize = h;
    }

    public int getTextSize() {
        return TextSize;
    }

    public double factorX() {
        return DX;
    }

    public double factorY() {
        return DY;
    }

    public void scale(int w, int h) {
        if (Extent == null)
            return;
        double fx = (double) w / (Extent[2] - Extent[0]);
        if (fx * (Extent[3] - Extent[1]) > h) {
            fx = (double) h / (Extent[3] - Extent[1]);
        }
        fx *= 1.0; //0.9;
        DX = fx;
        DY = fx;
        X = -Extent[0] * fx;
        Y = -Extent[1] * fx;
        W = (int) (w - fx * (Extent[2] - Extent[0])) / 2;
        H = (int) (h - (h - fx * (Extent[3] - Extent[1])) / 2);
        Cgm.scale(this);
    }

    public void frame(Graphics g) {
        if (Extent == null)
            return;
        g.setColor(Color.black);
        g.drawRect(x(Extent[0]) - 1,
                y(Extent[3]) - 1,
                (int) Math.abs((Extent[2] - Extent[0]) * DX) + 1,
                (int) Math.abs((Extent[3] - Extent[1]) * DY) + 1);
    }

    public static void main(String args[]) throws IOException {
        DataInputStream in = new DataInputStream(new FileInputStream(args[0]));
        CGM cgm = new CGM();
        cgm.read(in);
        in.close();
        CGMDisplay d = new CGMDisplay(cgm);
        CGMPanel p = new CGMPanel(d);
        Frame f = new Frame();
        f.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
        f.setSize(600, 450);
        f.setLayout(new BorderLayout());
        f.add("Center", p);
        f.setVisible(true);
    }

    public void changeColor(Color oldc, Color newc) {// actually
                                                     // changes the
                                                     // color in the
                                                     // cgm commands
                                                     // having this
                                                     // oldc,
                                                     // replacing
        // it with newc
        Cgm.changeColor(oldc, newc);
    }

}