Java 在形状程序中实现用户定义的异常以调整框架大小

我正在做一个画形状的程序。单击菜单中的形状后，它将根据jSlider中的值绘制下面的形状

我正在尝试创建一个异常，这样当用户尝试调整框架的大小，使其小于DrawPanel上绘制的形状时

为此，我想创建一个if语句，这样如果帧的宽度或高度小于x-y位置加上滑块的值，它将抛出一个异常

抽绳形状：

package ShapesProgram;
//adding the imports
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JPanel;

/**
 *
 * @
 */
public class DrawShape extends JPanel {

//Declaring variables 
private boolean isCircle;
private boolean isSquare;
private boolean isTriangle;
private int xPosition = 50;
private int yPosition = 50;
MyFrame shapeFrame;
int length;

//making the frame
public DrawShape(MyFrame f) {
    shapeFrame = f;
    initComponents();
    isCircle = false;
    isSquare = false;
    isTriangle = false;
    this.setBackground(Color.LIGHT_GRAY);
    repaint();
}

public void setLength(int length) {
    this.length = length;
}

//setting the shapes to false
public void setIsCircle(boolean isCircle) {
    this.isCircle = isCircle;
    this.isSquare = false;
    this.isTriangle = false;

}

public void setIsSquare(boolean isSquare) {
    this.isSquare = isSquare;
    this.isCircle = false;
    this.isTriangle = false;
}

public void setIsTriangle(boolean isTriangle) {
    this.isTriangle = isTriangle;
    this.isSquare = false;
    this.isCircle = false;
}

@Override
public void paintComponent(Graphics g) {

    Graphics2D g2 = (Graphics2D) g;
    super.paintComponent(g);

    if (isSquare == true) {
        // draw a Square
        g2.drawRect(xPosition, yPosition, length, length);
        repaint();
    } else if (isCircle == true) {

        // draw a Circle
        g2.drawOval(xPosition, yPosition, length, length);
        repaint();
    } else if (isTriangle == true) {

        // draw a Trianlge
        int[] xPoints = new int[3];
        int[] yPoints = new int[3];
        xPoints[0] = xPosition;
        xPoints[1] = xPoints[0];
        xPoints[2] = xPoints[1] + length;
        yPoints[0] = yPosition;
        yPoints[1] = yPoints[0] + length;
        yPoints[2] = yPoints[1];
        g2.drawPolyline(xPoints, yPoints, xPoints.length);
        g2.drawLine(xPoints[0], yPoints[0], xPoints[2], yPoints[2]);

        repaint();
    }

}

/**
 * This method is called from within the constructor to initialize the form.
 * WARNING: Do NOT modify this code. The content of this method is always
 * regenerated by the Form Editor.
 */
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">                          
private void initComponents() {

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
    this.setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 400, Short.MAX_VALUE)
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 300, Short.MAX_VALUE)
    );
}// </editor-fold>                        
// Variables declaration - do not modify                     
// End of variables declaration                   
}

正方形：

package MyShape;

/**
*
* @
*/
public class Square extends MyShape {

@Override
public double computeArea(int length) {
  return length*length;
}

@Override
public double computeBLength(int length) {
   return 4*length;
}

}

三角形：

package MyShape;

/**
*
* @
*/
public class Triangle extends MyShape {

@Override
public double computeArea(int length) {
    return length * 2 + Math.sqrt (2 * length * length);
}

@Override
public double computeBLength(int length) {
    return length * length / 2;
}

}

---

与其显示你的全部代码基础，不如考虑简化你的问题，只显示相关信息。这使那些试图帮助你的人能够更快地发现你的问题，你甚至可以在简化的过程中解决你的问题。请整理代码格式，也许可以将所有这些代码简化为一个较小的示例，让人们有时间学习。我没有看到任何问题。到底是什么问题？对不起，我想了解一些关于在jFrame或两个JPanel中实现用户定义异常的技巧。当框架大小调整为小于drawPanel上的项目时，我想引发异常。一旦我进入桌面，我将减少代码。谢谢

package ShapesProgram;
//adding the imports
import MyShape.Circle;
import MyShape.MyShape;
import MyShape.Square;
import MyShape.Triangle;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.DecimalFormat;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;

/**
*
* @
*/
public final class MyFrame extends javax.swing.JFrame {

MyShape myShape = new MyShape();

//creating a new JMenuBar
JMenuBar jMenuBar1 = new JMenuBar();
JMenu shape = new JMenu("Shape");

//creating new JMenuItems dor the shapes
JMenuItem circle = new JMenuItem("Circle");
JMenuItem square = new JMenuItem("Square");
JMenuItem triangle = new JMenuItem("Triangle");

MyControlPanel panel1 = new MyControlPanel(this);
DrawShape drawPanel = new DrawShape(this);

//Creates new form MyFrame
public MyFrame() {

    //setting the size, title and minimum size of the frame
    this.setSize(400, 400);
    this.setMinimumSize(new Dimension(400, 400));
    this.setTitle("Shapes Program");

    initComponents();
    linkListeners();

    //setting the layout for the frame
    this.setLayout(new BorderLayout());

    //adding the components to the frame
    shape.add(square);
    shape.add(circle);
    shape.add(triangle);
    jMenuBar1.add(shape);

    setJMenuBar(jMenuBar1);

    //adding the panels to the frame 
    this.add(panel1, BorderLayout.SOUTH);
    this.add(drawPanel, BorderLayout.CENTER);

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
}



//creating a new action listener for the shapes
public void linkListeners() {
    MyActionListener l = new MyActionListener();
    circle.addActionListener(l);
    square.addActionListener(l);
    triangle.addActionListener(l);

}

class MyActionListener implements ActionListener {

    @Override
    public void actionPerformed(ActionEvent e) {


        Object obj = e.getSource();

        //when square is selected, it is set to visable 
        //and outputs "Square Selected
        if ((JMenuItem) obj == square) {
            myShape = new Square();
            drawPanel.setIsSquare(true);
            System.out.println("Square Selected");

            //when circle is selected, it is set to visable 
            //and outputs "Circle Selected
        } else if ((JMenuItem) obj == circle) {
            myShape = new Circle();
            drawPanel.setIsCircle(true);
            System.out.println("Circle Selected");

            } 

            //when triangle is selected, it is set to visable 
            //and outputs "Triangle Selected
          else if ((JMenuItem) obj == triangle) {
            myShape = new Triangle();
            drawPanel.setIsTriangle(true);
            System.out.println("Triangle Selected");

        }
    }
}

public DrawShape getDrawPanel() {
    return drawPanel;

}

public MyShape getMyShape() {
    return myShape;
}

/**
 * This method is called from within the constructor to initialize the form.
 * WARNING: Do NOT modify this code. The content of this method is always
 * regenerated by the Form Editor.
 */
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">                          
private void initComponents() {

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 400, Short.MAX_VALUE)
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 300, Short.MAX_VALUE)
    );

    pack();
}// </editor-fold>                        

/**
 * @param args the command line arguments
 */
public static void main(String args[]) {
    /* Set the Nimbus look and feel */
    //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
    /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
     * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
     */
    try {
        for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
            if ("Nimbus".equals(info.getName())) {
                javax.swing.UIManager.setLookAndFeel(info.getClassName());
                break;
            }
        }
    } catch (ClassNotFoundException ex) {
        java.util.logging.Logger.getLogger(MyFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        java.util.logging.Logger.getLogger(MyFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        java.util.logging.Logger.getLogger(MyFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(MyFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    }
    //</editor-fold>

    /* Create and display the form */
    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            new MyFrame().setVisible(true);
            DecimalFormat oneDigit = new DecimalFormat("#,##0.0");

        }
    });
}
// Variables declaration - do not modify                     
// End of variables declaration                   
}

package MyShape;

/**
*
* @
*/
public class Circle extends MyShape {


@Override
public double computeArea(int length) {
    return length*length*Math.PI;
}


@Override
public double computeBLength(int length) {
    return 2*length*Math.PI;
}

}

package MyShape;

/**
*
* @
*/
public class Square extends MyShape {

@Override
public double computeArea(int length) {
  return length*length;
}

@Override
public double computeBLength(int length) {
   return 4*length;
}

}

package MyShape;

/**
*
* @
*/
public class Triangle extends MyShape {

@Override
public double computeArea(int length) {
    return length * 2 + Math.sqrt (2 * length * length);
}

@Override
public double computeBLength(int length) {
    return length * length / 2;
}

}