containergraphic.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.

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 * 
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package com.bbn.openmap.examples.beanbox;

import com.bbn.openmap.omGraphics.OMGraphic;
import com.bbn.openmap.omGraphics.OMRect;
import com.bbn.openmap.omGraphics.OMGraphicConstants;

/**
 * A custom graphic class for representing objects of type
 * {@link com.bbn.openmap.examples.beanbox.SimpleBeanContainer}as a
 * rectangular box.
 */
public class ContainerGraphic extends CustomGraphic {

    public ContainerGraphic(SimpleBeanObject object) {
        super(object);
        this.setRenderType(OMGraphicConstants.RENDERTYPE_LATLON);
    }

    /**
     * Returns an OMRect object with dimensions equal to the width and
     * height of the SimpleBeanContainer and position equal to the
     * center lat/lon position of the SimpleBeanContainer object.
     */
    public OMGraphic createGraphic(SimpleBeanObject object) {

        if (!(object instanceof SimpleBeanContainer)) {
            throw new IllegalArgumentException(object
                    + " not instance of SimpleBeanContainer");
        }

        SimpleBeanContainer bc = (SimpleBeanContainer) object;

        return new OMRect(bc.getTopLatitude(), bc.getLeftLongitude(), bc.getBottomLatitude(), bc.getRightLongitude(), OMGraphicConstants.LINETYPE_RHUMB);
    }

    /**
     * Updates the width, height and position of OMRect object used to
     * represent the SimpleBeanContainer object with the corresponding
     * values in the SimpleBeanContainer object.
     */
    public void updateGraphic(SimpleBeanObject object) {

        if (!(object instanceof SimpleBeanContainer)) {
            throw new IllegalArgumentException(object
                    + " not instance of SimpleBeanContainer");
        }

        SimpleBeanContainer bc = (SimpleBeanContainer) object;

        OMGraphic graphic = super.getOMGraphicAt(0);

        if (graphic instanceof OMRect) {

            OMRect rect = (OMRect) graphic;

            rect.setLocation(bc.getTopLatitude(),
                    bc.getLeftLongitude(),
                    bc.getBottomLatitude(),
                    bc.getRightLongitude(),
                    OMGraphicConstants.LINETYPE_RHUMB);

        }

    }

}