sunjpegformatter.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/image/SunJPEGFormatter.java,v
// $
// $RCSfile: SunJPEGFormatter.java,v $
// $Revision: 1.3.2.2 $
// $Date: 2005/08/09 19:18:31 $
// $Author: dietrick $
// 
// **********************************************************************

package com.bbn.openmap.image;

import java.awt.image.BufferedImage;
import java.util.Properties;

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

public class SunJPEGFormatter extends AbstractImageFormatter {

    public static final String QualityProperty = "imagequality";

    protected float imageQuality = .8f;

    public SunJPEGFormatter() {}

    public void setProperties(String prefix, Properties props) {
        imageQuality = PropUtils.floatFromProperties(props,
                (prefix == null ? "" : prefix) + QualityProperty,
                imageQuality);
        if (Debug.debugging("image")) {
            Debug.output("SunJPEGFormatter setting image quality to: "
                    + imageQuality);
        }
    }

    public ImageFormatter makeClone() {
        SunJPEGFormatter formatter = new SunJPEGFormatter();
        formatter.setImageQuality(getImageQuality());
        return formatter;
    }

    public float getImageQuality() {
        return imageQuality;
    }

    /** For this formatter, image quality is a number in the 0-1 range. */
    public void setImageQuality(float quality) {
        imageQuality = quality;
    }

    public byte[] formatImage(BufferedImage bi) {
        try {
            return JPEGHelper.encodeJPEG(bi, imageQuality);
        } catch (java.io.IOException ioe) {
            Debug.error("SunJPEGFormatter caught IOException formatting image!");
            return new byte[0];
        }
    }

    /**
     * Get the Image Type created by the ImageFormatter. These
     * responses should adhere to the OGC WMT standard format labels.
     * Some are listed in the WMTConstants interface file.
     */
    public String getFormatLabel() {
        return WMTConstants.IMAGEFORMAT_JPEG;
    }
}