在java中开发图像编辑器
我正在尝试用Java开发图像编辑器。我的图像编辑器的Java图像实现的一部分是加载图像并绘制一些形状，除了执行旋转，缩放等。
我正在使用JLabel加载图片但是有没有办法使用JLabel在图像上绘制和应用转换？我在网上找到的所有例子都使用了JPanel。
5 个答案:
答案 0 :(得分：5)
你真的需要看看Java2D turorial。您应该在Graphics2D上绘制图像，还可以在Graphics2D上旋转和缩放图像。
请勿使用JLabel，因为
-
组件太重（尽管
JLabel重量轻）。您可以将图标添加到JLabel，但是在 在大多数情况下，他们更愿意解决而不是改变 经常和任意，以及对组件的操纵涉及 对其进行频繁和随意的更改。 -
如果添加大量组件，也会降低效率。 （每个组件都会在属于的单独
Graphics对象中绘制自己 它和它的容器将全部绘制它们，布局也很重要。） -
另一个缺点是有时很难甚至不可能 对组件或几个组件进行一些操作。例如，如果要添加两张图片并将其分组，该怎么办？您需要2
JLabels，1JPanel（也许）。那么如果你想在这两个图像上画一条线并再次分组呢？
以下是基本步骤：
- 覆盖组件的
paint或paintComponent方法; - 将
Graphics个实例投射到Graphics2D; - 设置
Graphics2D; 的一些渲染属性
- 设置
Graphics2D; 的变换（旋转，缩放等）
- 在
Graphics2D上绘制图片
涉及的课程太多，例如Graphics2D，AffineTransform，RenderingHints，BufferedImage，Shape等等，甚至更多的方法。我无法在这里描述一切。看看教程。它为您提供了API的概述，并告诉您如何执行这些操作。
答案 1 :(得分：3)
我正在使用JLabel加载图片，但是在那里绘制和应用 使用JLabel转换图像？
不确定你的意思。
但您可以简单地获取JLabel的图标（显示的图像）执行我们转换为BufferedImage的图标需要执行的操作，然后通过{重新应用图标{1}}。
这是一个简短的例子，希望它有所帮助：
旋转-45度之前带有图标/setIcon(..)的 JLabel：
BufferedImage，轮换并通过JLabel重新应用
setIcon(...)<强>更新
我确实同意@shuangwhywhy。通过import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.event.ActionEvent;
import java.awt.image.BufferedImage;
import javax.swing.AbstractAction;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
public class Test {
private static JLabel imageLabel;
private static JFrame frame;
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
JPanel panel = new JPanel();
imageLabel = new JLabel(new ImageIcon(createImage()));//set image of JLabel
panel.add(imageLabel);
frame.add(panel);
frame.pack();
frame.setVisible(true);
startImageChangeTimer();//creates a timer which will rotate image after 5 seconds
}
private void startImageChangeTimer() {
Timer timer = new Timer(5000, new AbstractAction() {
@Override
public void actionPerformed(ActionEvent ae) {
//get JLabel Icon and convert to BufferedImage
BufferedImage img = getBufferedImageOfIcon(imageLabel.getIcon(), imageLabel.getWidth(), imageLabel.getHeight());
//rotate the image
img = createTransformedImage(img, -45);
//change the labels image
imageLabel.setIcon(new ImageIcon(img));
frame.pack();//resize frame accrodingly
}
});
timer.setRepeats(false);
timer.start();
}
});
}
public static BufferedImage createImage() {
BufferedImage img = new BufferedImage(100, 50, BufferedImage.TRANSLUCENT);
Graphics2D g2d = img.createGraphics();
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setColor(Color.WHITE);
g2d.fillRect(0, 0, img.getWidth(), img.getHeight());
g2d.setColor(Color.BLACK);
g2d.setFont(new Font("Calibri", Font.BOLD, 20));
FontMetrics fm = g2d.getFontMetrics();
String text = "Hello world";
int textWidth = fm.stringWidth(text);
g2d.drawString(text, (img.getWidth() / 2) - textWidth / 2, img.getHeight() / 2);
g2d.dispose();
return img;
}
public static BufferedImage getBufferedImageOfIcon(Icon icon, int imgW, int imgH) {
BufferedImage img = new BufferedImage(imgW, imgH, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = (Graphics2D) img.getGraphics();
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
icon.paintIcon(null, g2d, 0, 0);
g2d.dispose();
return img;
}
public static BufferedImage createTransformedImage(BufferedImage image, double angle) {
double sin = Math.abs(Math.sin(angle));
double cos = Math.abs(Math.cos(angle));
int originalWidth = image.getWidth();
int originalHeight = image.getHeight();
int newWidth = (int) Math.floor(originalWidth * cos + originalHeight * sin);
int newHeight = (int) Math.floor(originalHeight * cos + originalWidth * sin);
BufferedImage rotatedBI = new BufferedImage(newWidth, newHeight, BufferedImage.TRANSLUCENT);
Graphics2D g2d = rotatedBI.createGraphics();
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2d.translate((newWidth - originalWidth) / 2, (newHeight - originalHeight) / 2);
g2d.rotate(angle, originalWidth / 2, originalHeight / 2);
g2d.drawImage(image, 0, 0, null);
g2d.dispose();
return rotatedBI;
}
}
将图片绘制到JPanel，这样您只需调整图片大小并将其设置为paintComponent(Graphics g)图片（通过 getters and setters ），然后调用{{ 1}}显示更改。
答案 2 :(得分：1)
这是简单图像编辑器
/*Arpana*/
CPanel displayPanel;
JButton sharpenButton, blurringButton, edButton, resetButton;
public ConvolveApp()
super();
Container container = getContentPane();
displayPanel = new CPanel();
container.add(displayPanel);
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(2, 2));
panel
.setBorder(new TitledBorder(
"Click a Button to Perform the Associated Operation and Reset..."));
sharpenButton = new JButton("Sharpen");
sharpenButton.addActionListener(new ButtonListener());
blurringButton = new JButton("Blur");
blurringButton.addActionListener(new ButtonListener());
edButton = new JButton("Edge Detect");
edButton.addActionListener(new ButtonListener());
resetButton = new JButton("Reset");
resetButton.addActionListener(new ButtonListener());
panel.add(sharpenButton);
panel.add(blurringButton);
panel.add(edButton);
panel.add(resetButton);
container.add(BorderLayout.SOUTH, panel);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
setSize(displayPanel.getWidth(), displayPanel.getHeight() + 10);
setVisible(true);
public static void main(String arg[]) {
new ConvolveApp();
class ButtonListener implements ActionListener
public void actionPerformed(ActionEvent e)
JButton button = (JButton) e.getSource();
if (button.equals(sharpenButton))
displayPanel.sharpen();
displayPanel.repaint();
else if (button.equals(blurringButton))
displayPanel.blur();
displayPanel.repaint();
else if (button.equals(edButton))
displayPanel.edgeDetect();
displayPanel.repaint();
else if (button.equals(resetButton))
displayPanel.reset();
displayPanel.repaint();
class CPanel extends JLabel
Image displayImage;
BufferedImage biSrc;
BufferedImage biDest;
BufferedImage bi;
Graphics2D big;
CPanel()
setBackground(Color.black);
loadImage();
setSize(displayImage.getWidth(this), displayImage.getWidth(this));
createBufferedImages();
bi = biSrc;
public void loadImage()
displayImage = Toolkit.getDefaultToolkit().getImage("Arpana.jpg");
MediaTracker mt = new MediaTracker(this);
mt.addImage(displayImage, 1);
try
mt.waitForAll();
if (displayImage.getWidth(this) == -1)
System.out.println("No jpg file");
System.exit(0);
public void createBufferedImages()
biSrc = new BufferedImage(displayImage.getWidth(this), displayImage
.getHeight(this), BufferedImage.TYPE_INT_RGB);
big = biSrc.createGraphics();
big.drawImage(displayImage, 0, 0, this);
biDest = new BufferedImage(displayImage.getWidth(this), displayImage
.getHeight(this), BufferedImage.TYPE_INT_RGB);
public void sharpen()
float data[] = { -1.0f, -1.0f, -1.0f, -1.0f, 9.0f, -1.0f, -1.0f, -1.0f,
-1.0f };
Kernel kernel = new Kernel(3, 3, data);
ConvolveOp convolve = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP,
null);
convolve.filter(biSrc, biDest);
bi = biDest;
public void blur()
float data[] = { 0.0625f, 0.125f, 0.0625f, 0.125f, 0.25f, 0.125f,
0.0625f, 0.125f, 0.0625f };
Kernel kernel = new Kernel(3, 3, data);
ConvolveOp convolve = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP,
null);
convolve.filter(biSrc, biDest);
bi = biDest;
public void edgeDetect()
float data[] = { 1.0f, 0.0f, -1.0f, 1.0f, 0.0f, -1.0f, 1.0f, 0.0f,
-1.0f };
Kernel kernel = new Kernel(3, 3, data);
ConvolveOp convolve = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP,
null);
convolve.filter(biSrc, biDest);
public void reset()
big.setColor(Color.black);
big.clearRect(0, 0, bi.getWidth(this), bi.getHeight(this));
big.drawImage(displayImage, 0, 0, this);
bi = biSrc;
public void update(Graphics g)
g.clearRect(0, 0, getWidth(), getHeight());
paintComponent(g);
答案 3 :(得分：0)
我只听说有人使用JLabel来实现这一目标。我建议将BufferedImage显示为JLabel的背景。当用户对图像应用编辑时，编辑图像（如果您还没有用于处理图像的库，我强烈推荐imgscalr）并将其重新应用为JLabel的背景（如果它没有' t自动更新）。
答案 4 :(得分：0)
/* Arpana*/
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
import java.awt.image.ConvolveOp;
import java.awt.image.Kernel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.border.TitledBorder;
public class ConvolveApp extends JFrame {
CPanel displayPanel;
JButton sharpenButton, blurringButton, edButton, resetButton;
public ConvolveApp() {
super();
Container container = getContentPane();
displayPanel = new CPanel();
container.add(displayPanel);
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(2, 2));
panel
.setBorder(new TitledBorder(
"Click a Button to Perform the Associated Operation and Reset..."));
sharpenButton = new JButton("Sharpen");
sharpenButton.addActionListener(new ButtonListener());
blurringButton = new JButton("Blur");
blurringButton.addActionListener(new ButtonListener());
edButton = new JButton("Edge Detect");
edButton.addActionListener(new ButtonListener());
resetButton = new JButton("Reset");
resetButton.addActionListener(new ButtonListener());
panel.add(sharpenButton);
panel.add(blurringButton);
panel.add(edButton);
panel.add(resetButton);
container.add(BorderLayout.SOUTH, panel);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
setSize(displayPanel.getWidth(), displayPanel.getHeight() + 10);
setVisible(true);
}
public static void main(String arg[]) {
new ConvolveApp();
}
class ButtonListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
JButton button = (JButton) e.getSource();
if (button.equals(sharpenButton)) {
displayPanel.sharpen();
displayPanel.repaint();
} else if (button.equals(blurringButton)) {
displayPanel.blur();
displayPanel.repaint();
} else if (button.equals(edButton)) {
displayPanel.edgeDetect();
displayPanel.repaint();
} else if (button.equals(resetButton)) {
displayPanel.reset();
displayPanel.repaint();
}
}
}
}
class CPanel extends JLabel {
Image displayImage;
BufferedImage biSrc;
BufferedImage biDest; // Destination image is mandetory.
BufferedImage bi; // Only an additional reference.
Graphics2D big;
CPanel() {
setBackground(Color.black);
loadImage();
setSize(displayImage.getWidth(this), displayImage.getWidth(this));
createBufferedImages();
bi = biSrc;
}
public void loadImage() {
displayImage = Toolkit.getDefaultToolkit().getImage("Arpana.jpg");
MediaTracker mt = new MediaTracker(this);
mt.addImage(displayImage, 1);
try {
mt.waitForAll();
} catch (Exception e) {
System.out.println("Exception while loading.");
}
if (displayImage.getWidth(this) == -1) {
System.out.println("No jpg file");
System.exit(0);
}
}
public void createBufferedImages() {
biSrc = new BufferedImage(displayImage.getWidth(this), displayImage
.getHeight(this), BufferedImage.TYPE_INT_RGB);
big = biSrc.createGraphics();
big.drawImage(displayImage, 0, 0, this);
biDest = new BufferedImage(displayImage.getWidth(this), displayImage
.getHeight(this), BufferedImage.TYPE_INT_RGB);
}
public void sharpen() {
float data[] = { -1.0f, -1.0f, -1.0f, -1.0f, 9.0f, -1.0f, -1.0f, -1.0f,
-1.0f };
Kernel kernel = new Kernel(3, 3, data);
ConvolveOp convolve = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP,
null);
convolve.filter(biSrc, biDest);
bi = biDest;
}
public void blur() {
float data[] = { 0.0625f, 0.125f, 0.0625f, 0.125f, 0.25f, 0.125f,
0.0625f, 0.125f, 0.0625f };
Kernel kernel = new Kernel(3, 3, data);
ConvolveOp convolve = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP,
null);
convolve.filter(biSrc, biDest);
bi = biDest;
}
public void edgeDetect() {
float data[] = { 1.0f, 0.0f, -1.0f, 1.0f, 0.0f, -1.0f, 1.0f, 0.0f,
-1.0f };
Kernel kernel = new Kernel(3, 3, data);
ConvolveOp convolve = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP,
null);
convolve.filter(biSrc, biDest);
bi = biDest;
}
public void reset() {
big.setColor(Color.black);
big.clearRect(0, 0, bi.getWidth(this), bi.getHeight(this));
big.drawImage(displayImage, 0, 0, this);
bi = biSrc;
}
public void update(Graphics g) {
g.clearRect(0, 0, getWidth(), getHeight());
paintComponent(g);
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2D = (Graphics2D) g;
g2D.drawImage(bi, 0, 0, this);
}
}
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