Question

我正在尝试创建一个图像，通过将像素从旧位置复制到新坐标，为Java上的现有图像添加边框。到目前为止，这就是我所做的：

public static NewPic border (NewPic p, int borderWidth, Pixel borderColor) {
   int w = p.getWidth();
   int h = p.getHeight();

   Pixel src[][] = p.getBitmap();
   Pixel tgt[][] = new Pixel[h][w];

   for (int x = 0; x < w; x++) {
     for (int y = 0; y < h; y++) {
       tgt[y][x + y + borderWidth]  = src[x][y]; // this is probably where I a messing up
     }
  }
  return new NewPic(tgt);
  }

在我评论的行中不确定我做错了什么。我是Java新手。有人可以给我一些指导吗？

Answer 1

一种方法是使用基于Swing的边框。

Image with Border

import java.awt.*;
import java.awt.image.BufferedImage;
import javax.swing.*;
import javax.swing.border.*;

class ImageBorder {

    public static void main(String[] args) {
    Runnable r = new Runnable() {

        @Override
        public void run() {
        JPanel gui = new JPanel(new BorderLayout());
        // to contrast the 'picture frame' border created below
        gui.setBorder(new LineBorder(Color.BLUE, 12));

        Image image = // your image here..
            new BufferedImage(400,50,BufferedImage.TYPE_INT_RGB);
        JLabel l = new JLabel(new ImageIcon(image));
        Border b1 = new BevelBorder(
            BevelBorder.LOWERED, Color.LIGHT_GRAY, Color.DARK_GRAY);
        Border b2 = new LineBorder(Color.GRAY, 12);
        Border b3 = new BevelBorder(
            BevelBorder.LOWERED, Color.LIGHT_GRAY, Color.DARK_GRAY);
        Border bTemp = new CompoundBorder(b1,b2);
        Border b = new CompoundBorder(bTemp,b3);
        l.setBorder(b);

        gui.add(l);

        JOptionPane.showMessageDialog(null, gui);
        }
    };
    // Swing GUIs should be created and updated on the EDT
    // http://docs.oracle.com/javase/tutorial/uiswing/concurrency/initial.html
    SwingUtilities.invokeLater(r);
    }
}

Answer 2

您可以创建一个BorderedBufferedImage，其int borderThickness，borderColor颜色和BufferedImage。

This website也可能会提供一些帮助：

import java.awt.*;
import javax.swing.*;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
import java.io.*;
import javax.swing.BorderFactory; 

class testImagePanel{
    public static void main(String[] args){

    BufferedImage image = null;
    ImagePanel imagePanel = null;

    try{
        image = ImageIO.read(new File("Pictures/pl.jpg"));
        imagePanel = new ImagePanel(image);
    }catch(IOException  e){
         System.err.println("Trying to read in image "+e);
    }

    JFrame frame = new JFrame("Example");
    frame.add(imagePanel);
    frame.pack();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);   

    }
}

public class ImagePanel extends JPanel {

BufferedImage image;
Dimension size;

public ImagePanel(BufferedImage image) {
    this.image = image;
    this.size = new Dimension();
    size.setSize(image.getWidth(), image.getHeight());
    this.setBackground(Color.WHITE);
    this.setBorder(BorderFactory.createLineBorder(Color.RED, 1));
}

@Override
protected void paintComponent(Graphics g) {
    // Center image in this component.
    int x = (getWidth() - size.width)/2;
    int y = (getHeight() - size.height)/2;
    g.drawImage(image, x, y, this);
}
@Override
public Dimension getPreferredSize() { return size; }
}

Answer 3

我使用以下逻辑为任何图像添加边框：

BufferedImage source = ImageIO.read(original);
int borderedImageWidth = width + (borderLeft * 2);
int borderedImageHeight = height + (borderTop * 2);
BufferedImage img = new BufferedImage(borderedImageWidth, borderedImageHeight, BufferedImage.TYPE_3BYTE_BGR);
img.createGraphics();
Graphics2D g = (Graphics2D) img.getGraphics();
g.setColor(Color.YELLOW);
g.fillRect(0, 0, borderedImageWidth, borderedImageHeight);
g.drawImage(source, borderLeft, borderTop, width + borderLeft, height + borderTop, 0, 0, width, height, Color.YELLOW, null);
File output = File.createTempFile("output", ".png");
ImageIO.write(img, "png", outputFile);

这将在黄色矩形上绘制图像，该矩形的大小比图像大，从而为图像提供边框。

Answer 4

我知道这个帖子是从2013年开始的，但我遇到了这个问题，我有一个解决方案可以保留OP试图做的事情：

public static NewPic border (NewPic p, int borderWidth, Pixel borderColor) 
{
   int w = p.getWidth();
   int h = p.getHeight();

   Pixel src[][] = p.getBitmap();
   Pixel tgt[][] = new Pixel[h + borderWidth * 2][w + borderWidth * 2];

   for (int x = 0; x < w + borderWidth; x++) 
   {
      for (int y = 0; y < h + borderWidth; y++) 
      {
         if (x >= borderWidth && x < w - borderWidth && y >= borderWidth && y < h - borderWidth)
         {
            tgt[x][y] = src[x - borderWidth][y - borderWidth];
         }
         else
         {
            tgt[x][y] = borderColor;
         }
      }
   }
   return new NewPic(tgt);
}

Answer 5

清洁Java最简单的方法：

String imagePath = "this/is/your/image.jpg";
BufferedImage myPicture = ImageIO.read(new File(imagePath));
Graphics2D g = (Graphics2D) myPicture.getGraphics();
g.setStroke(new BasicStroke(3));
g.setColor(Color.BLUE);
g.drawRect(10, 10, myPicture.getWidth() - 20, myPicture.getHeight() - 20);
ImageIO.write(myPicture, "jpg", new File(imagePath));

在Java中为图像添加边框

5 个答案: