package org.yeshi.utils;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.InputStream;

import net.coobird.thumbnailator.Thumbnails;
import net.coobird.thumbnailator.Thumbnails.Builder;
import net.coobird.thumbnailator.geometry.Positions;

/**
 * 图片裁剪帮助
 * 
 * @author Administrator
 *
 */
public class ImageCropUtil {

	/**
	 * 剪切图片中间部分（内切）
	 * @param sourceImage
	 * @param destImage
	 * @param ratio
	 * @throws FileNotFoundException
	 * @throws Exception
	 */
	public static void centerCrop(InputStream sourceImage, File destImage, float ratio)
			throws FileNotFoundException, Exception {
		if (sourceImage==null)
			throw new FileNotFoundException();
		
		BufferedImage image = Thumbnails.of(sourceImage).scale(1.0f).asBufferedImage();
		int width = image.getWidth();
		int height = image.getHeight();
		int newWidth = 0;
		int newHeight = 0;
		if (width > ratio * height) {// 以高为主
			newHeight = height;
			newWidth = (int) (newHeight * ratio);
		} else {// 以宽为主
			newWidth = width;
			newHeight = (int) (newWidth / ratio);
		}

		if (destImage.exists())
			destImage.delete();

		Thumbnails.of(sourceImage).sourceRegion(Positions.CENTER, newWidth, newHeight).scale(1.0)
				.toFile(destImage.getPath());
	}
	
	
	public static void centerCrop(File sourceImage, File destImage, float ratio)
			throws FileNotFoundException, Exception {
		if (sourceImage==null)
			throw new FileNotFoundException();
		
		BufferedImage image = Thumbnails.of(sourceImage).scale(1.0f).asBufferedImage();
		int width = image.getWidth();
		int height = image.getHeight();
		int newWidth = 0;
		int newHeight = 0;
		if (width > ratio * height) {// 以高为主
			newHeight = height;
			newWidth = (int) (newHeight * ratio);
		} else {// 以宽为主
			newWidth = width;
			newHeight = (int) (newWidth / ratio);
		}

		if (destImage.exists())
			destImage.delete();

		Thumbnails.of(sourceImage).sourceRegion(Positions.CENTER, newWidth, newHeight).scale(1.0)
				.toFile(destImage.getPath());
	}

}