爪哇mouseListener的鼠标移动不起作用

我想做一个绘图程序，程序应该显示用户目前的点，我试图使用mousemove这个功能（使用控制台现在查看结果），但它不工作。爪哇mouseListener的鼠标移动不起作用

public class drawArea extends JPanel implements MouseListener { 
Image img; 
int w=580; 
int h=580; 
String equation = ""; 
int clicks = 0; 

public drawArea(){ 
    init(); 
    this.addMouseListener(this); 
} 

private void init(){ 
    setPreferredSize(new Dimension(w, h)); 
    setVisible(true); 
    img = new ImageIcon("assets/Graph.png").getImage(); 
} 

private void initializeGrid(Graphics g) { 

    Graphics2D g2d = (Graphics2D) g; 
    g2d.drawImage(img, 0, 0, this); 

} 

private void drawFunction(Graphics g, String function) { 
    Graphics2D g2d = (Graphics2D) g; 
    g2d.setColor(Color.blue); 

    double p=0.01; //plotting precision 

    for(double x=-5;x<5;x+=p){ 
     int drawingX1=gx((x)); 
     int drawingY1=gy(f(x)); 
     int drawingX2=gx(x+p); 
     int drawingY2=gy(f(x+p)); 
     g2d.drawLine(drawingX1, drawingY1, drawingX2, drawingY2); 

    } 

} 

private double f(double x){ 
    return x*x; 
} 

private int gx(double x){ 
    return (int) ((x+5)*(w/10)); 
} 

private int gy(double y){ 
    return (int) (h-(y+5)*(h/10)); 
} 

public void setEquation(String equ){ 
    equation=equ; 
} 

public void paintComponent(Graphics g) { 

    super.paintComponent(g); 
    initializeGrid(g); 
    drawFunction(g,"Function"); 
} 

public void mouseClicked(MouseEvent e) { 
    if(clicks<3){ 
     MainUI.points[clicks][0] = e.getX(); 
     MainUI.points[clicks][1] = e.getY(); 
     System.out.println(e.getX()+","+e.getY()); 
     System.out.println(MainUI.points[clicks] [0]+","+MainUI.points[clicks][1]); 
     clicks++; 
    } 
} 

public void mouseEntered(MouseEvent e) { 
    //not needed 
} 

public void mouseExited(MouseEvent arg0) { 
    //not needed 
} 

public void mousePressed(MouseEvent arg0) { 
    //not needed   
} 

public void mouseReleased(MouseEvent arg0) { 
    //not needed  
} 

public void mouseMoved(MouseEvent e) { 
    System.out.println(e.getX()+","+e.getY());  
} 
}

由于提前

来源

2014-04-25 Ahmed Saad

您是否尝试在'mouseMoved'上放置'@ Override'注释来查看您是否正确覆盖了一个方法？（当你_应该） –

MouseListener没有mouseMoved方法。

你必须补充一点，你要也实现了鼠标运动 Listener接口声明：

public class drawArea extends JPanel 
    implements MouseListener, MouseMotionListener

此外，您必须添加此鼠标运动听众在构造

this.addMouseMotionListener(this);

来源

2014-04-25 14:21:59 Marco13

爪哇mouseListener的鼠标移动不起作用

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