添加图片上点击鼠标? Java小程序 [英] Add image on mouse click? Java applet
问题描述
我怎么会去和鼠标添加图像坐标中的鼠标点击时?我已经看过这个:对鼠标添加图像点击的JPanel
How would I go and add an image on the mouse coordinates when the mouse clicks? I have looked at this :Adding Images on Mouse Click to JPanel
但我不明白,我试图在applet添加鼠标点击
But I don't understand it and am trying to add it on mouse click in an applet
和请不要说,学习一些基本的Java第一!并为我提供一个链接到某些Oracle文档,我不能得到这些东西的任何信息。
And please don't say, "Learn some basic java first! and provide me with a link to some oracle docs", I just can't get any info from those things.
code:
> `import java.applet.Applet;
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.image.BufferedImage;
import java.io.IOException;
`import java.net.URL;
import javax.imageio.ImageIO;
public class SHR extends Applet implements MouseListener{
int a;
int b;
@Override
public void mouseClicked(MouseEvent e) {
a = e.getX();
b = e.getY();
paint(null, a, b);/this is the part i am having trouble with
}
@Override
public void mouseEntered(MouseEvent arg0) {
}
@Override
public void mouseExited(MouseEvent arg0) {
}
@Override
public void mousePressed(MouseEvent arg0) {
}
@Override
public void mouseReleased(MouseEvent arg0) {
}
public void paint(Graphics g, int x, int y){
BufferedImage photo = null;
try
{
URL u = new URL(getCodeBase(),"SilverHandRecruit.png");
photo = ImageIO.read(u);
}
catch (IOException e)
{
g.drawString("Problem reading the file", 100, 100);
}
g.drawImage(photo,x, y, 10, 30, null);
}
}
`
问题是,我不知道我应该代替NULL一起得到它的工作。
The problem is, I don't know what I am supposed to replace "null" with to get it to work
感谢
推荐答案
通过的绘画在AWT和Swing 和执行定制绘画了解画中的AWT / Swing的是如何工作的。
Start by taking a look at Painting in AWT and Swing and Performing Custom Painting to understand how painting works in AWT/Swing.
然后,看看 2D图形了解更多详细信息,你如何能使用图形
类油漆事情。
Then, take a look at 2D Graphics for more details about how you can use the Graphics
class to paint things with.
这是它加载一个单一的形象,你点击面板上的每一次真正的基本的例子,它移动到这一点。
This is a really basic example which loads a single image and every time you click on the panel, moves it to that point.
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class DrawImage {
public static void main(String[] args) {
new DrawImage();
}
public DrawImage() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private BufferedImage image;
private Point drawPoint;
public TestPane() {
try {
image = ImageIO.read(getClass().getResource("/SmallPony.png"));
addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
drawPoint = new Point(e.getPoint());
repaint();
}
});
} catch (IOException ex) {
ex.printStackTrace();
}
}
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
if (drawPoint != null) {
g2d.drawImage(image, drawPoint.x, drawPoint.y, this);
}
g2d.dispose();
}
}
}
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