/**
 *@author 孫月江
 */
import java.io.File;

import org.im4java.core.ConvertCmd;
import org.im4java.core.IMOperation;
import org.im4java.process.ProcessStarter;
import org.springframework.util.Assert;

public class ImageCropper {
    private static final String ENV_OS = System.getProperty("os.name").toLowerCase();
    private static final String ImageMagickPath = "D:\\software\\ImageMagick";

    static {
        if (isWindows()) {
            Assert.isTrue(new File(ImageMagickPath).exists(), "you shoud first install ImageMagick software to use cropper in your windows system.");
            ProcessStarter.setGlobalSearchPath(ImageMagickPath);
        }
    }
    public static void main(String args[]) throws Exception {
        System.out.println(ENV_OS);
        String inputFileLocation = "d:/d.jpeg";
        String outputFileLocation = "d:/d-res.jpeg";
        boolean r = crop(inputFileLocation, outputFileLocation, 50, 50, 200, 140);
        System.out.println(r);
    }

    public static boolean isWindows() {
        return (ENV_OS.indexOf("win") >= 0);
    }

    /**
     * 按照給定的參數截取圖片區域
     * 
     * @param imagePath 原圖位置
     * @param newPath 結果圖位置
     * @param x 橫坐標
     * @param y 縱坐標
     * @param width 寬度
     * @param height 高度
     * @return
     */
    public static boolean crop(String imagePath, String newPath, int x, int y, int width, int height) {
        boolean flag = false;
        try {
            IMOperation op = new IMOperation();
            op.addImage();
            /** width：裁剪的寬度 * height：裁剪的高度 * x：裁剪的橫坐標 * y：裁剪縱坐標 */
            op.crop(width, height, x, y);
            op.addImage();
            ConvertCmd convert = new ConvertCmd();
            convert.run(op, imagePath, newPath);
            flag = true;
        } catch (Exception e) {
            e.printStackTrace();
            flag = false;
        }
        return flag;
    }

    /**
     * 縮放圖片
     * 
     * @param imagePath
     * @param newPath
     * @param width
     * @param height
     * @return
     */
    public static boolean scale(String imagePath, String newPath, int width, int height) {
        boolean flag = false;
        try {
            IMOperation op = new IMOperation();
            op.addImage();
            op.resize(width, height);
            op.addImage();
            ConvertCmd convert = new ConvertCmd();
            convert.run(op, imagePath, newPath);
            flag = true;
        } catch (Exception e) {
            e.printStackTrace();
            flag = false;
        }
        return flag;
    }

}