editableomdistance.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/openmap/com/bbn/openmap/omGraphics/EditableOMDistance.java,v $
// $RCSfile: EditableOMDistance.java,v $
// $Revision: 1.7.2.1 $
// $Date: 2004/10/14 18:27:23 $
// $Author: dietrick $
// 
// **********************************************************************

package com.bbn.openmap.omGraphics;

import com.bbn.openmap.proj.Length;
import com.bbn.openmap.util.Debug;

/**
 * The EditableOMDistance encompasses an OMDistance, providing methods
 * for modifying or creating it.
 */
public class EditableOMDistance extends EditableOMPoly {

    /**
     * Create the EditableOMDistance, setting the state machine to
     * create the poly off of the gestures.
     */
    public EditableOMDistance() {
        super();
    }

    /**
     * Create an EditableOMDistance with the polyType and renderType
     * parameters in the GraphicAttributes object.
     */
    public EditableOMDistance(GraphicAttributes ga) {
        super(ga);
    }

    /**
     * Create the EditableOMDistance with an OMDistance already
     * defined, ready for editing.
     * 
     * @param omp OMDistance that should be edited.
     */
    public EditableOMDistance(OMDistance omp) {
        super(omp);
    }

    /**
     * Create and set the graphic within the state machine. The
     * GraphicAttributes describe the type of poly to create.
     */
    public void createGraphic(GraphicAttributes ga) {
        init();
        stateMachine.setUndefined();
        int renderType = OMGraphic.RENDERTYPE_LATLON;
        int lineType = OMGraphic.LINETYPE_GREATCIRCLE;

        if (ga != null) {
            renderType = ga.getRenderType();
            lineType = ga.getLineType();
        }

        if (Debug.debugging("eomg")) {
            Debug.output("EditableOMDistance.createGraphic(): rendertype = "
                    + renderType);
        }

        if (lineType == OMGraphic.LINETYPE_UNKNOWN) {
            lineType = OMGraphic.LINETYPE_GREATCIRCLE;
            ga.setLineType(OMGraphic.LINETYPE_GREATCIRCLE);
        }

        this.poly = (OMDistance) createGraphic(renderType, lineType);

        if (ga != null) {
            ga.setRenderType(poly.getRenderType());
            ga.setTo(poly);
        }
    }

    /**
     * Extendable method to create specific subclasses of OMDistances.
     */
    public OMGraphic createGraphic(int renderType, int lineType) {
        OMGraphic g = null;
        switch (renderType) {
        case (OMGraphic.RENDERTYPE_OFFSET):
            System.err.println("Offset type not supported for OMDistance");
        }
        g = new OMDistance(new float[0], OMGraphic.RADIANS, lineType, Length.NM);
        ((OMDistance) g).setDoShapes(true);
        return g;
    }

    /**
     * A convenience method that gives an EditableOMGraphic a chance
     * to modify the OMGraphic so it can be drawn quickly, by turning
     * off labels, etc, right before the XORpainting happens. The
     * OMGraphic should be configured so that the render method does
     * the least amount of painting possible. Note that the
     * DrawingAttributes for the OMGraphic have already been set to
     * DrawingAttributes.DEFAULT (black line, clear fill).
     */
    protected void modifyOMGraphicForEditRender() {
        ((OMDistance) getGraphic()).paintOnlyPoly = true;
    }

    /**
     * A convenience method that gives an EditableOMGraphic a chance
     * to reset the OMGraphic so it can be rendered normally, after it
     * has been modified for quick paints. The DrawingAttributes for
     * the OMGraphic have already been reset to their normal settings,
     * from the DrawingAttributes.DEFAULT settings that were used for
     * the quick paint.
     */
    protected void resetOMGraphicAfterEditRender() {
        ((OMDistance) getGraphic()).paintOnlyPoly = false;
    }
}