Java ME引路蜂地图开发示例：地图平移

RasterMap 有两个方法可以用于平移地图，panTo 将地图移动到指定经纬度坐标，panDirection(dx,dy)　将地图从当前位置平移dx,dy 个象素。
下列示例可以上，下，左，右平移地图。

package com.pstreets.gisengine.demo.midp; //--------------------------------- IMPORTS ------------------------------------import com.mapdigit.gis.geometry.GeoLatLng;import com.mapdigit.gis.raster.MapType;import com.pstreets.gisengine.demo.MapDemoMIDP;import javax.microedition.lcdui.Command;import javax.microedition.lcdui.CommandListener;import javax.microedition.lcdui.Display;import javax.microedition.lcdui.Displayable;//[------------------------------ MAIN CLASS ----------------------------------]//--------------------------------- REVISIONS ----------------------------------// Date       Name                 Tracking #         Description// --------   -------------------  -------------      --------------------------// 28JAN2011  James Shen                              Initial Creation/////////////////////////////////////////////////////////////////////////////////** *  map pan demo for Guidebee Map API on MIDP platform. */public class MapPanMIDP extends MapDemoMIDP implements CommandListener {     private Command mapUpCommand = new Command("Up", Command.OK, 1);    private Command mapDownCommand = new Command("Down", Command.ITEM, 1);    private Command mapLeftCommand = new Command("Left", Command.ITEM, 1);    private Command mapRightCommand = new Command("Right", Command.ITEM, 1);     public void startApp() {         init();        canvas.addCommand(mapUpCommand);        canvas.addCommand(mapDownCommand);        canvas.addCommand(mapLeftCommand);        canvas.addCommand(mapRightCommand);        canvas.setCommandListener(this);        GeoLatLng center = new GeoLatLng(32.0616667, 118.7777778);        map.setCenter(center, 13, MapType.MICROSOFTCHINA);        Display.getDisplay(this).setCurrent(canvas);    }     public void commandAction(Command c, Displayable d) {        if (c == mapUpCommand) {            map.panDirection(0, -32);         } else if (c == mapDownCommand) {            map.panDirection(0, 32);        } else if (c == mapLeftCommand) {            map.panDirection(-32, 0);        } else if (c == mapRightCommand) {            map.panDirection(32, 0);        }     }}