我花了几天时间寻找一种通过鼠标捕获将像素绘制到 Java 窗口的方法。我正在寻找一些我可以插入的框架。看起来好像很简单......任何帮助将不胜感激。
(编辑) 这是一些不起作用的代码。
public class Base extends JPanel implements MouseMotionListener {
public static void main(String[] args) {
new Base();
}
final static int width = 800;
final static int height = 600;
BufferedImage img;
Base() {
img = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB_PRE);
JFrame frame = new JFrame();
frame.addMouseMotionListener(this);
frame.add(this);
frame.setSize(width, height);
frame.setEnabled(true);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
@Override
public void mouseDragged(MouseEvent e) {
}
@Override
public void mouseMoved(MouseEvent e) {
Graphics g = img.getGraphics();
g.drawRect(1, 1, width - 2, height - 2);
g.dispose();
repaint();
}
@Override
public void paintComponent(Graphics g) {
g.drawImage(img, 0, 0, null);
}
}
最佳答案
查看代码中的注释。
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.swing.*;
public class Base extends JPanel implements MouseMotionListener {
public static void main(String[] args) {
new Base();
}
final static int width = 400;
final static int height = 300;
BufferedImage img;
Base() {
img = new BufferedImage(width, height,
BufferedImage.TYPE_INT_ARGB_PRE);
// do in preference to setting the frame size..
setPreferredSize(new Dimension(width, height));
JFrame frame = new JFrame();
this.addMouseMotionListener(this); // INSTEAD OF THE FRAME
frame.add(this);
//frame.setSize(width, height); DO INSTEAD...
frame.pack();
//frame.setEnabled(true); REDUNDANT
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // good call!
}
@Override
public void mouseDragged(MouseEvent e) {
}
@Override
public void mouseMoved(MouseEvent e) {
Graphics g = img.getGraphics();
g.setColor(Color.RED); // SET A COLOR
g.drawRect(1, 1, width - 2, height - 2);
// DO SOMETHING UGLY
g.setColor(Color.blue);
Point p = e.getPoint();
g.fillOval(p.x,p.y,5,5);
g.dispose();
repaint();
}
@Override
public void paintComponent(Graphics g) {
g.drawImage(img, 0, 0, null);
}
}
关于java - 我想用鼠标输入在窗口上绘制像素,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/6553845/