我正在用java开发汽车模拟。我的编码如下。我想放一个面板，它是与 180 度的速度计图像一起旋转的线。我的问题是我该怎么做？
public class House extends JPanel implements ActionListener
{
MyCanvas canvas;
JButton mybutton,mybutton1,mybutton2,mybutton3,mybutton4,mybutton5;
JTextField text1,text2,text3;
JSlider sliderTransX, sliderTransY, sliderRotateTheta, sliderRotateX,
sliderRotateY, sliderScaleX, sliderScaleY, sliderWidth;
`enter code here`int k = 0;
double transX = 0.0;
double transY = 0.0;
double rotateTheta = 0.0;
double rotateX = 345.0;
double rotateY = 250.0;
double scaleX = 1.0;
double scaleY = 1.0;
float width = 1.0f;
Cargame game = new Cargame();
public House()
{
super(new BorderLayout());
JPanel controlPanel = new JPanel(new GridLayout(3, 3));
add(controlPanel, BorderLayout.NORTH);
sliderRotateTheta = setSlider(controlPanel, JSlider.HORIZONTAL, 0, 180,
0, 90, 45);
mybutton = new JButton("Accelerate");
mybutton.addActionListener(this);
mybutton1 = new JButton("ShiftUp");
mybutton1.addActionListener(this);
mybutton2 = new JButton("ShiftDown");
mybutton2.addActionListener(this);
mybutton3 = new JButton("Deaccelerate");
mybutton3.addActionListener(this);
mybutton4 = new JButton("Start Engine");
mybutton4.addActionListener(this);
mybutton5 = new JButton("Stop Engine");
mybutton5.addActionListener(this);
text1=new JTextField(5);
text2=new JTextField(5);
text3=new JTextField(5);
sliderWidth = new JSlider(JSlider.HORIZONTAL, 0, 20, 1);
sliderWidth.addChangeListener(new ChangeListener()
{
public void stateChanged(ChangeEvent e) {
width = sliderWidth.getValue();
canvas.repaint();
}
});
JPanel widthPanel = new JPanel();
widthPanel.setLayout(new GridLayout(3, 3));
widthPanel.add(mybutton);
widthPanel.add(mybutton1);
widthPanel.add(mybutton2);
widthPanel.add(mybutton3);
widthPanel.add(mybutton4);
widthPanel.add(mybutton5);
widthPanel.add(text1);
widthPanel.add(text2);
widthPanel.add(text3);
add(widthPanel, BorderLayout.SOUTH);
canvas = new MyCanvas();
add(canvas, "Center");
}
public void actionPerformed(ActionEvent e)
{
if (e.getSource() == mybutton)
{
game.Accelerate();
}
if (e.getSource() == mybutton1)
{
game.ShiftUp();
}
if (e.getSource() == mybutton2)
{
game.ShiftDown();
}
if (e.getSource() == mybutton3)
{
game.Deaccelerate();
}
JSlider tempSlider=new JSlider();
rotateTheta= ((double)game.getLevel()) * Math.PI / 180;
text1.setText(String.valueOf(game.getLevel()));
text2.setText(String.valueOf(game.getGear()));
text3.setText(String.valueOf(game.Speedometer()));
canvas.repaint();
}
public JSlider setSlider(JPanel panel, int orientation, int minimumValue,
int maximumValue, int initValue, int majorTickSpacing,
int minorTickSpacing) {
JSlider slider = new JSlider(orientation, minimumValue, maximumValue,
initValue);
slider.addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent e) {
JSlider tempSlider = (JSlider) e.getSource();
sliderRotateTheta.setValue(k);
if(tempSlider.equals(sliderRotateTheta))
{
rotateTheta = sliderRotateTheta.getValue() * Math.PI / 180;
canvas.repaint();
}}
});
slider.setVisible(false);
panel.add(slider);
return slider;
}
class MyCanvas extends Canvas {
public void paint(Graphics g) {
Graphics2D g2D = (Graphics2D) g;
g2D.rotate(rotateTheta, rotateX, rotateY);
BasicStroke stroke = new BasicStroke(width);
g2D.setStroke(stroke);
drawHome(g2D);
}
public void drawHome(Graphics2D g2D) {
Line2D line7 = new Line2D.Float(205f, 250f, 345f, 250f);
g2D.draw(line7);
}
}
public static void main(String[] a) {
JFrame f = new JFrame();
f.getContentPane().add(new House());
f.setDefaultCloseOperation(1);
f.setSize(700, 550);
f.setVisible(true);
}
}