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• ImageOpt.java

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com.centit.support.image.ImageOpt Maven / Gradle / Ivy

package com.centit.support.image;

import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.ArrayList;
import java.util.List;
@SuppressWarnings("unused")
public abstract class ImageOpt {

    private ImageOpt() {
        throw new IllegalAccessError("Utility class");
    }

    /**
     * 创建图片的缩略图 ，算法来做网络，测试通过
     *
     * @param filename  文件名称
     * @param thumbWidth 缩略图宽度
     * @param thumbHeight 缩略图高度
     * @param quality 缩略图质量
     * @param outFilename 输出文件名
     * @throws InterruptedException  分析异常
     * @throws FileNotFoundException 文件读取异常
     * @throws IOException IO
     */
    public static void createThumbnail(String filename, int thumbWidth, int thumbHeight, int quality,
            String outFilename) throws InterruptedException, FileNotFoundException, IOException {
        // load image from filename
        Image image = Toolkit.getDefaultToolkit().getImage(filename);
        MediaTracker mediaTracker = new MediaTracker(new Container());
        mediaTracker.addImage(image, 0);
        mediaTracker.waitForID(0);
        // use this to test for errors at this point:
        // System.out.println(mediaTracker.isErrorAny());

        // determine thumbnail size from WIDTH and HEIGHT
        double thumbRatio = (double) thumbWidth / (double) thumbHeight;
        int imageWidth = image.getWidth(null);
        int imageHeight = image.getHeight(null);
        double imageRatio = (double) imageWidth / (double) imageHeight;
        if (thumbRatio < imageRatio) {
            thumbHeight = (int) (thumbWidth / imageRatio);
        } else {
            thumbWidth = (int) (thumbHeight * imageRatio);
        }

        // draw original image to thumbnail image object and
        // scale it to the new size on-the-fly
        BufferedImage thumbImage = new BufferedImage(thumbWidth, thumbHeight, BufferedImage.TYPE_INT_RGB);
        Graphics2D graphics2D = thumbImage.createGraphics();
        graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        graphics2D.drawImage(image, 0, 0, thumbWidth, thumbHeight, null);

        // save thumbnail image to outFilename
        BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(outFilename));
        JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
        JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(thumbImage);
        quality = Math.max(0, Math.min(quality, 100));
        param.setQuality((float) quality / 100.0f, false);
        encoder.setJPEGEncodeParam(param);
        encoder.encode(thumbImage);
        out.close();
    }

    /**
     * 抓屏程序 算法来做网络，测试通过
     *
     * @param fileName  文件名称
     * @throws AWTException  异常
     * @throws IOException  异常
     */
    public static void captureScreen(String fileName) throws AWTException, IOException  {

        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        Rectangle screenRectangle = new Rectangle(screenSize);
        Robot robot = new Robot();
        BufferedImage image = robot.createScreenCapture(screenRectangle);
        ImageIO.write(image, "png", new File(fileName));
    }

    /**
     * 对图像进行
     * @param image 图片
     * @param subImageBounds 图片区域
     * @return 截图
     * @throws IOException 异常
     */
    public static BufferedImage saveSubImage(BufferedImage image, Rectangle subImageBounds)
            throws IOException {

        BufferedImage subImage = new BufferedImage(subImageBounds.width, subImageBounds.height, 1);
        Graphics g = subImage.getGraphics();

        if ((subImageBounds.width > image.getWidth()) || (subImageBounds.height > image.getHeight())) {
            int left = subImageBounds.x;
            int top = subImageBounds.y;
            if (image.getWidth() < subImageBounds.width)
                left = (subImageBounds.width - image.getWidth()) / 2;
            if (image.getHeight() < subImageBounds.height)
                top = (subImageBounds.height - image.getHeight()) / 2;
            g.setColor(Color.white);
            g.fillRect(0, 0, subImageBounds.width, subImageBounds.height);
            g.drawImage(image, left, top, null);
            return image;
        } else {
            g.drawImage(
                    image.getSubimage(subImageBounds.x, subImageBounds.y, subImageBounds.width, subImageBounds.height),
                    0, 0, null);
        }
        g.dispose();
        return subImage;
    }

    public static List splitImage(BufferedImage image, int divisions)
            throws IOException {
        List images = new ArrayList();
        if(divisions<2){
            images.add(image);
            return images;
        }
        int imgWidth = image.getWidth();
        int subImgWidth = imgWidth / divisions;
        int imgHeight = image.getHeight();
        for(int i=0;i