我的程序应该允许用户将矩阵的前六个数字输入到文本字段中，然后点击应用按钮，使用 .transform 方法更改 Path2D，参数是六个输入的数字。我的问题是，每当我输入内容并点击应用时，转换与应有的完全不同，并且原始箭头也保留在后面。
这真的很奇怪，我不知道问题出在哪里。使用仿射变换，一切都应该在正确的位置，但是变换出来的都是错误的。
这应该是这样的：
这对我来说是这样的：
我将把完整的代码放在下面，这样你就可以自己运行它，看看你是否能够弄清楚。谢谢！
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.AffineTransform;
import java.awt.geom.GeneralPath;
import java.awt.geom.Path2D;
import javax.swing.event.*;
public class Project3 extends JPanel implements ActionListener {
public static Project3 p = new Project3();
Path2D.Double arrow = new Path2D.Double();
public static JTextField
num1 = new JTextField("1"), num2 = new JTextField("0"),
num3 = new JTextField("0"), num4 = new JTextField("0"),
num5 = new JTextField("1"), num6 = new JTextField("0");
public Project3() {
setBackground(Color.WHITE);
}
public Path2D.Double drawArrow() {
arrow.setWindingRule(GeneralPath.WIND_EVEN_ODD);
arrow.moveTo(0, 0);
arrow.lineTo(0, -100);
arrow.moveTo(0, -200);
arrow.lineTo(100, -100);
arrow.lineTo(50, -100);
arrow.lineTo(50, 100);
arrow.quadTo(0, 0, -50, 100);
arrow.lineTo(-50, -100);
arrow.lineTo(-100, -100);
arrow.lineTo(0, -200);
arrow.closePath();
return arrow;
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
g2.translate(250, 250);
GradientPaint gradient = new GradientPaint(0, 0, Color.LIGHT_GRAY, 15, 15, Color.BLACK, true);
g2.setPaint(gradient);
g2.setStroke(new BasicStroke(12, BasicStroke.CAP_ROUND, BasicStroke.JOIN_MITER));
g2.draw(drawArrow());
}
public static void main(String[] args) {
JFrame frame = new JFrame("Project 3");
frame.setSize(500, 600);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container cp = frame.getContentPane();
cp.setLayout(new BorderLayout());
JPanel panel = new JPanel();
panel.setLayout(new BorderLayout());
cp.add(panel, BorderLayout.CENTER);
panel.add(p, BorderLayout.CENTER);
panel = new JPanel();
panel.setLayout(new GridLayout(0, 2));
cp.add(panel, BorderLayout.SOUTH);
JPanel textPanel = new JPanel();
textPanel.setLayout(new GridLayout(2, 3));
panel.add(textPanel);
textPanel.add(num1);
textPanel.add(num2);
textPanel.add(num3);
textPanel.add(num4);
textPanel.add(num5);
textPanel.add(num6);
JPanel btPanel = new JPanel();
btPanel.setLayout(new GridLayout(0, 1));
panel.add(btPanel);
JButton apply = new JButton("Apply");
apply.addActionListener(p);
btPanel.add(apply);
JButton reset = new JButton("Reset");
reset.addActionListener(p);
btPanel.add(reset);
frame.setVisible(true);
}
@Override
public void actionPerformed(ActionEvent e) {
String command = e.getActionCommand();
switch (command) {
case "Apply":
double args1 = Double.parseDouble(num1.getText());
double args2 = Double.parseDouble(num2.getText());
double args3 = Double.parseDouble(num3.getText());
double args4 = Double.parseDouble(num4.getText());
double args5 = Double.parseDouble(num5.getText());
double args6 = Double.parseDouble(num6.getText());
arrow.transform(new AffineTransform(args1, args2, args3, args4, args5, args6));
repaint();
break;
case "Reset":
arrow.transform(new AffineTransform(1, 0, 0, 0, 1, 0));
repaint();
break;
}
}
}