package com.aifeng.util;

  
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;

import javax.imageio.ImageIO;

import com.sun.image.codec.jpeg.ImageFormatException;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
  
/**
 * 缩放图片工具类，创建缩略图、伸缩图片比例
 * @ClassName: ScaleImageUtils 
 * @Description: TODO
 * @author: cosco gt.fan@msn.cn
 * @date: 2016年8月19日 下午11:51:49
 */
public abstract class ScaleImageUtil{
  
    private static final float DEFAULT_SCALE_QUALITY = 1f;
    private static final String DEFAULT_IMAGE_FORMAT = ".jpg"; // 图像文件的格式 
    private static final String DEFAULT_FILE_PATH = "d:/temp-";
     
    /**
     * <b>function:</b> 设置图片压缩质量枚举类；
     * Some guidelines: 0.75 high quality、0.5  medium quality、0.25 low quality
     * @version 1.0
     */
    public enum ImageQuality {
        max(1.0f), high(0.75f), medium(0.5f), low(0.25f);
         
        private Float quality;
        public Float getQuality() {
            return this.quality;
        }
        ImageQuality(Float quality) {
            this.quality = quality;
        }
    }
     
    private static Image image;
     
    /**
     * <b>function:</b> 通过目标对象的大小和标准（指定）大小计算出图片缩小的比例
     * @author cosco
     * @createDate 2012-2-6 下午04:41:48
     * @param targetWidth 目标的宽度
     * @param targetHeight 目标的高度
     * @param standardWidth 标准（指定）宽度
     * @param standardHeight 标准（指定）高度
     * @return 最小的合适比例
     */
    public static double getScaling(double targetWidth, double targetHeight, double standardWidth, double standardHeight) {
        double widthScaling = 0d;
        double heightScaling = 0d;
        if (targetWidth > standardWidth) {
            widthScaling = standardWidth / (targetWidth * 1.00d);
        } else {
            widthScaling = 1d;
        }
        if (targetHeight > standardHeight) {
            heightScaling = standardHeight / (targetHeight * 1.00d);
        } else {
            heightScaling = 1d;
        }
        return Math.min(widthScaling, heightScaling);
    }
     
    /**
     * <b>function:</b> 将Image的宽度、高度缩放到指定width、height，并保存在savePath目录
     * @author cosco
     * @createDate 2012-2-6 下午04:54:35
     * @param width 缩放的宽度
     * @param height 缩放的高度
     * @param savePath 保存目录
     * @param targetImage 即将缩放的目标图片
     * @return 图片保存路径、名称
     * @throws ImageFormatException
     * @throws IOException
     */
    public static String resize(int width, int height, String savePath, Image targetImage) throws ImageFormatException, IOException {
        width = Math.max(width, 1);
        height = Math.max(height, 1);
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        image.getGraphics().drawImage(targetImage, 0, 0, width, height, null);
         
        if (savePath == null || "".equals(savePath)) {
            savePath = DEFAULT_FILE_PATH + System.currentTimeMillis() + DEFAULT_IMAGE_FORMAT;
        }
         
        FileOutputStream fos = new FileOutputStream(new File(savePath));
        JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(fos);
        encoder.encode(image);
  
        image.flush();
        fos.flush();
        fos.close();
         
        return savePath;
    }
     
    /**
     * <b>function:</b> 可以设置图片缩放质量，并且可以根据指定的宽高缩放图片
     * @author cosco
     * @createDate 2012-2-7 上午11:01:27
     * @param width 缩放的宽度
     * @param height 缩放的高度
     * @param quality 图片压缩质量，最大值是1； 使用枚举值：{@link ImageQuality}
     *             Some guidelines: 0.75 high quality、0.5  medium quality、0.25 low quality
     * @param savePath 保存目录
     * @param targetImage 即将缩放的目标图片
     * @return 图片保存路径、名称
     * @throws ImageFormatException
     * @throws IOException
     */
    public static String resize(int width, int height, Float quality, String savePath, Image targetImage) throws ImageFormatException, IOException {
        width = Math.max(width, 1);
        height = Math.max(height, 1);
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        image.getGraphics().drawImage(targetImage, 0, 0, width, height, null);
         
        if (savePath == null || "".equals(savePath)) {
            savePath = DEFAULT_FILE_PATH + System.currentTimeMillis() + DEFAULT_IMAGE_FORMAT;
        }
         
        FileOutputStream fos = new FileOutputStream(new File(savePath));
        JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(fos);
         
        JPEGEncodeParam encodeParam = JPEGCodec.getDefaultJPEGEncodeParam(image); 
        if (quality == null || quality <= 0) {
            quality = DEFAULT_SCALE_QUALITY;
        }
        /** 设置图片压缩质量 */  
        encodeParam.setQuality(quality, true);  
        encoder.encode(image, encodeParam);  
  
        image.flush();
        fos.flush();
        fos.close();
         
        return savePath;
    }
     
    /**
     * <b>function:</b> 通过指定大小和图片的大小，计算出图片缩小的合适大小
     * @author cosco
     * @createDate 2012-2-6 下午05:53:10
     * @param width 指定的宽度
     * @param height 指定的高度
     * @param image 图片文件
     * @return 返回宽度、高度的int数组
     */
    public static int[] getSize(int width, int height, Image image) {
        int targetWidth = image.getWidth(null);
        int targetHeight = image.getHeight(null);
        double scaling = getScaling(targetWidth, targetHeight, width, height);
        long standardWidth = Math.round(targetWidth * scaling);
        long standardHeight = Math.round(targetHeight * scaling);
        return new int[] { Integer.parseInt(Long.toString(standardWidth)), Integer.parseInt(String.valueOf(standardHeight)) };
    }
     
    /**
     * <b>function:</b> 通过指定的比例和图片对象，返回一个放大或缩小的宽度、高度
     * @author hoojo
     * @createDate 2012-2-7 上午10:27:59
     * @param scale 缩放比例
     * @param image 图片对象
     * @return 返回宽度、高度
     */
    public static int[] getSize(float scale, Image image) {
        int targetWidth = image.getWidth(null);
        int targetHeight = image.getHeight(null);
        long standardWidth = Math.round(targetWidth * scale);
        long standardHeight = Math.round(targetHeight * scale);
        return new int[] { Integer.parseInt(Long.toString(standardWidth)), Integer.parseInt(String.valueOf(standardHeight)) };
    }
     
    public static int[] getSize(int width, Image image) {
        int targetWidth = image.getWidth(null);
        int targetHeight = image.getHeight(null);
        long height = Math.round((targetHeight * width) / (targetWidth * 1.00f));
        return new int[] { width, Integer.parseInt(String.valueOf(height)) };
    }
     
    public static int[] getSizeByHeight(int height, Image image) {
        int targetWidth = image.getWidth(null);
        int targetHeight = image.getHeight(null);
        long width = Math.round((targetWidth * height) / (targetHeight * 1.00f));
        return new int[] { Integer.parseInt(String.valueOf(width)), height };
    }
     
    /**
     * 
     * <b>function:</b> 将指定的targetFile图片文件的宽度、高度大于指定width、height的图片缩小，并保存在savePath目录
     * @author cosco
     * @createDate 2012-2-6 下午04:57:02
     * @param width 缩小的宽度
     * @param height 缩小的高度
     * @param savePath 保存目录
     * @param targetImage 改变的目标图片
     * @return 图片保存路径、名称
     * @throws ImageFormatException
     * @throws IOException
     */
    public static String resize(int width, int height, String savePath, File targetFile) throws ImageFormatException, IOException {
        image = ImageIO.read(targetFile);
        int[] size = getSize(width, height, image);
        return resize(size[0], size[1], savePath, image);
    }
     
    /**
     * 
     * <b>function:</b> 将指定的targetURL网络图片文件的宽度、高度大于指定width、height的图片缩小，并保存在savePath目录
     * @author cosco
     * @createDate 2012-2-6 下午04:57:07
     * @param width 缩小的宽度
     * @param height 缩小的高度
     * @param savePath 保存目录
     * @param targetImage 改变的目标图片
     * @return 图片保存路径、名称
     * @throws ImageFormatException
     * @throws IOException
     */
    public static String resize(int width, int height, String savePath, URL targetURL) throws ImageFormatException, IOException {
        image = ImageIO.read(targetURL);
        int[] size = getSize(width, height, image);
        return resize(size[0], size[1], savePath, image);
    }
     
    /**
     * <b>function:</b> 将一个本地的图片文件按照指定的比例进行缩放
     * @author hoojo
     * @createDate 2012-2-7 上午10:29:18
     * @param scale 缩放比例
     * @param savePath 保存文件路径、名称
     * @param targetFile 本地图片文件
     * @return 新的文件名称
     * @throws ImageFormatException
     * @throws IOException
     */
    public static String resize(float scale, String savePath, File targetFile) throws ImageFormatException, IOException {
        image = ImageIO.read(targetFile);
        int[] size = getSize(scale, image);
        return resize(size[0], size[1], savePath, image);
    }
     
    /**
     * <b>function:</b> 将一个网络图片文件按照指定的比例进行缩放
     * @author cosco
     * @createDate 2012-2-7 上午10:30:56
     * @param scale 缩放比例
     * @param savePath 保存文件路径、名称
     * @param targetFile 本地图片文件
     * @return 新的文件名称
     * @throws ImageFormatException
     * @throws IOException
     */
    public static String resize(float scale, String savePath, URL targetURL) throws ImageFormatException, IOException {
        image = ImageIO.read(targetURL);
        int[] size = getSize(scale, image);
        return resize(size[0], size[1], savePath, image);
    }
     
    /**
     * <b>function:</b> 按照固定宽度进行等比缩放本地图片
     * @author hoojo
     * @createDate 2012-2-7 上午10:49:56
     * @param width 固定宽度
     * @param savePath 保存路径、名称
     * @param targetFile 本地目标文件
     * @return 返回保存路径
     * @throws ImageFormatException
     * @throws IOException
     */
    public static String resize(int width, String savePath, File targetFile) throws ImageFormatException, IOException {
        image = ImageIO.read(targetFile);
        int[] size = getSize(width, image);
        return resize(size[0], size[1], savePath, image);
    }
     
    /**
     * <b>function:</b> 按照固定宽度进行等比缩放网络图片
     * @author cosco
     * @createDate 2012-2-7 上午10:50:52
     * @param width 固定宽度
     * @param savePath 保存路径、名称
     * @param targetFile 本地目标文件
     * @return 返回保存路径
     * @throws ImageFormatException
     * @throws IOException
     */
    public static String resize(int width, String savePath, URL targetURL) throws ImageFormatException, IOException {
        image = ImageIO.read(targetURL);
        int[] size = getSize(width, image);
        return resize(size[0], size[1], savePath, image);
    }
     
    /**
     * 
     * <b>function:</b> 按照固定高度进行等比缩放本地图片
     * @author cosco
     * @createDate 2012-2-7 上午10:51:17
     * @param height 固定高度
     * @param savePath 保存路径、名称
     * @param targetFile 本地目标文件
     * @return 返回保存路径
     * @throws ImageFormatException
     * @throws IOException
     */
    public static String resizeByHeight(int height, String savePath, File targetFile) throws ImageFormatException, IOException {
        image = ImageIO.read(targetFile);
        int[] size = getSizeByHeight(height, image);
        return resize(size[0], size[1], savePath, image);
    }
     
    /**
     * <b>function:</b> 按照固定高度进行等比缩放网络图片
     * @author hoojo
     * @createDate 2012-2-7 上午10:52:23
     * @param height 固定高度
     * @param savePath 保存路径、名称
     * @param targetFile 本地目标文件
     * @return 返回保存路径
     * @throws ImageFormatException
     * @throws IOException
     */
    public static String resizeByHeight(int height, String savePath, URL targetURL) throws ImageFormatException, IOException {
        image = ImageIO.read(targetURL);
        int[] size = getSizeByHeight(height, image);
        return resize(size[0], size[1], savePath, image);
    }
     
    /**
     * <b>function:</b>
     * @author cosco
     * @createDate 2012-2-3 上午10:08:47
     * @param args
     * @throws IOException 
     * @throws MalformedURLException 
     * @throws ImageFormatException 
     */
    public static void main(String[] args) throws ImageFormatException, MalformedURLException, IOException {
         
        System.out.println(ScaleImageUtil.resize(200, 200, null, new File("d://1490334211082.png")));
//        System.out.println(ScaleImageUtil.resize(140, 140, null, new URL("http://picm.photophoto.cn/005/008/007/0080071495.jpg")));
//        ScaleImageUtil.resize(100, 100, ImageQuality.high.getQuality(), null, ImageIO.read(new URL("http://www.open-open.com/lib/images/logo.jpg")));
    }
}