utmprojectionloader.java

OpenMap是一个基于JavaBeansTM的开发工具包。利用OpenMap你就能够快速构建用于访问legacy数据库的应用程序与applets。OpenMap提供了允许用户查看和操作地理空间信息的

package com.bbn.openmap.proj;

import java.util.Properties;

import com.bbn.openmap.LatLonPoint;
import com.bbn.openmap.util.Debug;
import com.bbn.openmap.util.PropUtils;

public class UTMProjectionLoader extends BasicProjectionLoader {

    public static final String ZONE_NUMBER = "ZONE_NUMBER";

    public static final String ZONE_LETTER = "ZONE_LETTER";

    public static final String ELLIPSOID = "ELLIPSOID";

    public UTMProjectionLoader() {
        super(UTMProjection.class, "UTM Projection", "UTM Projection");
    }

    public Projection create(Properties props) throws ProjectionException {
        try {
            LatLonPoint center = (LatLonPoint) props.get(ProjectionFactory.CENTER);
            float scale = PropUtils.floatFromProperties(props, ProjectionFactory.SCALE, 10000000);
            int height = PropUtils.intFromProperties(props, ProjectionFactory.HEIGHT, 100);
            int width = PropUtils.intFromProperties(props, ProjectionFactory.WIDTH, 100);
            int type = UTMProjection.UTMType;
            int zone_number = PropUtils.intFromProperties(props, ZONE_NUMBER, 0);
            char zone_letter = ((String) props.get(ZONE_LETTER)).charAt(0);
            boolean isnorthern = (zone_letter == 'N');
            Ellipsoid ellps = (Ellipsoid) props.get(ELLIPSOID);
            return new UTMProjection(center, scale, width, height, type, zone_number, isnorthern,
                    ellps);
        } catch (Exception e) {
            if (Debug.debugging("proj")) {
                Debug.output("UTMProjectionLoader: problem creating UTM projection "
                        + e.getMessage());
                e.printStackTrace();
            }
        }

        throw new ProjectionException("UTMProjectionLoader: problem creating UTM projection");
    }

}