eclipse sdk를 사용하여

Question

도형 그리기 및 색상 변경 프로그램을 만들었습니다. 재설정 버튼을 기본 모양과 색상으로 재설정했지만 캔버스에서 모양을 지울 수 없습니다. 어떻게해야합니까?

// Color Clear choice box 
Choice colorChoice; 

// the canvas 
DrawCanvas canvas; 

/** 
* Constructor 
*/ 
public Draw() { 
    super("Java Draw"); 
    setLayout(new BorderLayout()); 

    // create panel for controls 
    Panel topPanel = new Panel(new GridLayout(3, 0)); 
    add(topPanel, BorderLayout.NORTH); 

    // create button control 
    Panel buttonPanel = new Panel(new FlowLayout(FlowLayout.LEFT)); 
    topPanel.add(buttonPanel); 

    circle = new Button("Circle"); 
    buttonPanel.add(circle); 
    roundRec = new Button("Rounded Rectangle"); 
    buttonPanel.add(roundRec); 
    threeDRec = new Button("3D Rectangle"); 
    buttonPanel.add(threeDRec); 

    // add button listener 
    circle.addActionListener(this); 
    roundRec.addActionListener(this); 
    threeDRec.addActionListener(this); 

    Panel buttonPanel1 = new Panel(new FlowLayout(FlowLayout.LEFT)); 
    topPanel.add(buttonPanel1); 

    lines = new Button("Lines"); 
    buttonPanel1.add(lines); 
    squares = new Button("Square"); 
    buttonPanel1.add(squares); 
    ovals = new Button("Ovals"); 
    buttonPanel1.add(ovals); 

    lines.addActionListener(this); 
    squares.addActionListener(this); 
    ovals.addActionListener(this); 

    // create panel for color choices 
    Panel colorPanel = new Panel(new FlowLayout(FlowLayout.LEFT)); 
    topPanel.add(colorPanel); 
    Label label = new Label("Filled Color:"); 
    colorPanel.add(label); 
    colorChoice = new Choice(); 
    for(int i=0; i<COLOR_NAMES.length; i++) { 
     colorChoice.add(COLOR_NAMES[i]); 
    } 
    colorPanel.add(colorChoice); 
    colorChoice.addItemListener(this); 

// create reset button 
    Button resetButton = new Button("Reset"); 
    colorPanel.add(resetButton); 
    resetButton.addActionListener(new ActionListener() { 
     public void actionPerformed(ActionEvent event) { 
      colorChoice.select(0);     // reset color choice box 
      canvas.setFilledColor(COLORS[0]);  // reset color used 
      canvas.setShape(DrawCanvas.CIRCLE);  // reset shape 

     } 
    }); 

// create the canvas 
    canvas = new DrawCanvas(); 
    add(canvas, BorderLayout.CENTER); 

}// end of constructor 


/** 
* Implementing ActionListener 
*/ 
public void actionPerformed(ActionEvent event) { 
    if(event.getSource() == circle) { // circle button 
     canvas.setShape(DrawCanvas.CIRCLE); 
    } 
    else if(event.getSource() == roundRec) { // rounded rectangle button 
     canvas.setShape(DrawCanvas.ROUNDED_RECTANGLE); 
    } 
    else if(event.getSource() == threeDRec) { // 3D rectangle button 
     canvas.setShape(DrawCanvas.RECTANGLE_3D); 
    }  
} 

/** 
* Implementing ItemListener 
*/ 
public void itemStateChanged(ItemEvent event) { 
    Color color = COLORS[colorChoice.getSelectedIndex()]; 
    canvas.setFilledColor(color); 
} 

/** 
* the main method 
*/ 
public static void main(String[] argv) { 
    // Create a frame 
    Draw frame = new Draw(); 
    frame.setSize(WIDTH, HEIGHT); 
    frame.setLocation(150, 100); 

    // add window closing listener 
    frame.addWindowListener(new WindowAdapter() { 
     public void windowClosing(WindowEvent event) { 
      System.exit(0); 
     } 
    }); 

    // Show the frame 
    frame.setVisible(true); 
    } 
} 

Answer 1

DrawCanvas이 JPanel 확장하는, 당신은 당신의 리셋 청취자의 말에 repaint를 호출 할 필요가 가정 : 여기 내 코드입니다.