org.rebioma.client.maps.EnvLayer.java Source code

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Here is the source code for org.rebioma.client.maps.EnvLayer.java

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/*
 * Copyright 2008 University of California at Berkeley
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package org.rebioma.client.maps;

import org.rebioma.client.bean.AscData;

import com.google.gwt.core.client.GWT;
import com.google.gwt.maps.client.base.Point;
import com.google.gwt.maps.client.base.Size;
import com.google.gwt.maps.client.maptypes.TileUrlCallBack;

/**
 * Represents an environmental layer that backed by an {@link AscData} that can
 * be overlaid on a Google map.
 */
public class EnvLayer extends AscTileLayer {

    /**
     * Returns a layer info that allows this environmental layer to be lazy
     * loaded.
     * 
     * @param data
     *          the asc data
     * @return the loayer info
     */
    public static LayerInfo init(final AscData data) {
        return new LayerInfo() {
            @Override
            public String getName() {
                return dataSummary(data);
            }

            @Override
            protected AscTileLayer get() {
                return EnvLayer.newInstance(data);
            }
        };
    }

    private static String dataSummary(AscData data) {
        return data.getEnvDataType() + " - " + data.getEnvDataSubtype() + " " + data.getYear();
    }

    private AscData data;

    private TileLayerLegend legend;

    protected EnvLayer() {
        super();
    }

    public static EnvLayer newInstance(AscData data) {
        final EnvLayer envLayer = new EnvLayer();
        envLayer.data = data;
        envLayer.imageMapTypeOptions.setTileSize(Size.newInstance(256, 256));
        envLayer.imageMapTypeOptions.setOpacity(0.5);
        //envLayer.setOpacity(opacity);
        envLayer.baseUrl = GWT.getModuleBaseURL() + "ascOverlay?f=" + data.getFileName();
        envLayer.imageMapTypeOptions.setTileUrl(new TileUrlCallBack() {
            @Override
            public String getTileUrl(Point point, int zoomLevel) {
                String tileUrl = envLayer.baseUrl;
                tileUrl += "&x=" + new Double(Math.rint(point.getX())).intValue();
                tileUrl += "&y=" + new Double(Math.rint(point.getY())).intValue();
                tileUrl += "&z=" + zoomLevel;
                return tileUrl;
            }
        });
        return envLayer;
    }

    @Override
    public TileLayerLegend getLegend() {
        if (legend == null) {
            legend = new EnvLayerLegend(data);
        }
        return legend;
    }
}