Java Ellipse绘图

Question

我正在为圆形写一个形状类，它应该输出形状加上它的尺寸。我正在尝试为我的方形和矩形类做同样的事情，但它不起作用。我将在这里发布我的主要方法，我的矩形类作为参考什么工作，最后我的圆类工作，但当我尝试在主方法中使用它时，它给我错误＆＃34;方法添加（组件）在类型Container中不适用于参数（Ellipse2D.Double）＆＃34;在它所说的frame3.add（myCircle）;

的行上

import java.awt.Component;
import java.awt.geom.Ellipse2D;
import java.util.Scanner;
import javax.swing.JFrame;


public class Main {

    static int input;
    static int length;
    static int width;
    static int height;

    public static void main(String[] args) {

        Scanner sc1 = new Scanner(System.in);
        while(true) {
            System.out.print("\n1 for square\n2 for restangle\n3 for circle\n4 for triangle\n5 to exit\n\nWhich shape do you want? ");
            input = sc1.nextInt();
            if(input == (5)) {
                break;
            }
            if(input == (1)) {


                System.out.print("Input the length: ");
                length = sc1.nextInt();
                Square mySquare = new Square(length);

                JFrame frame = new JFrame();

                frame.setSize(300,400);
                frame.setTitle("ShapeViewer");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

                frame.add(mySquare);
                frame.setVisible(true);}

            if(input==(2)) {


                System.out.print("Input the length: ");
                length = sc1.nextInt();
                System.out.print("Input the width: ");
                width = sc1.nextInt();
                Rectanglebox myRectangle = new Rectanglebox(length,width);

                JFrame frame2 = new JFrame();

                frame2.setSize(300,400);
                frame2.setTitle("ShapeViewer");
                frame2.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

                frame2.add(myRectangle);
                frame2.setVisible(true);}

           if(input==(3)) {

              System.out.print("Input the height: ");
              height = sc1.nextInt();
              System.out.print("Input the width: ");
              width = sc1.nextInt();
              Ellipse2D.Double myCircle = new Ellipse2D.Double(50,50,width,height);
              JFrame frame3 = new JFrame();

              frame3.setSize(300,400);
              frame3.setTitle("ShapeViewer");
              frame3.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

              frame3.add(myCircle);
              frame3.setVisible(true);
          }

            }


        }
    }

import javax.swing.JComponent;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Color;
import java.awt.Rectangle;

public class Rectanglebox extends JComponent{

    private int length;
    private int width;

    public Rectanglebox(int length,int width) {
        this.length = length;
        this.width = width;
    }

    public double getArea() {
        return length * width;
    }
    public double getPerimeter() {
        return (length * 2) + (width * 2);
    }

    public void paintComponent(Graphics g) {
        Graphics2D g2 = (Graphics2D)g;
        Rectangle square = new Rectangle(50,50,length,width);
        g2.draw(square);
        g2.drawString("Area: "+getArea(), 10, 110+width);
        g2.drawString("Perimeter: " + getPerimeter(), 110, 110+width);
        g2.drawString("Square", 110, 20);
        g2.drawString("Length: " +length, 10, 125+width);
        g2.drawString("Width: " +width, 80, 125+width);

        g2.setColor(Color.black);
        g2.fill(square);
    }
}

import javax.swing.JComponent;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Color;
import java.awt.Rectangle;
import java.awt.geom.Ellipse2D;

public class Circle extends JComponent{

    private int height;
    private int width;

    public Circle(int height,int width) {
        this.height = height;
        this.width = width;
    }

    public double getArea() {
        return Math.PI * (width / 2) * (width / 2);
    }
    public double getCircumference() {
        return 2 * Math.PI * (width / 2);
    }
    public void paintComponent(Graphics g) {
        Graphics2D g2 = (Graphics2D)g;
        Ellipse2D.Double ellipse = new Ellipse2D.Double(50,50,width,height);
        g2.draw(ellipse);
        g2.drawString("Area: "+getArea(), 110, 110+height);
        g2.drawString("Perimeter: " + getCircumference(), 200, 110+height);
        g2.drawString("Square", 110, 20);
        g2.drawString("Length: " +height, 10, 110+height);
        g2.setColor(Color.black);
        g2.fill(ellipse);
    }
}

Answer 1

您正尝试在框架中添加Shape：

Ellipse2D.Double myCircle = new Ellipse2D.Double(50,50,width,height);
//...
frame3.add(myCircle);

你应该添加Component，而不是Shape，所以你可能想写一下：

Circle myCircle = new Circle(height, width);
//...
frame3.add(myCircle);