Java 如何"；油漆；从arrayList到JPanel的形状？

我的任务是如何用java绘制形状的数组列表

不过，我觉得我大部分都是对的

ShapeChooserPanel中的最后一个方法我无法找到如何打印数组中的形状，它应该在单击鼠标的位置绘制当前形状

我的代码在下面

主要类别：

import javax.swing.JFrame;

public class Lab2 {

    public static void main (String[] args) {


        JFrame myFrame = new JFrame("Lab 2");

        myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        myFrame.add(new ShapeChooserPanel());
        myFrame.pack();
        myFrame.setVisible(true);


    }
}

形环板

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.ArrayList;

public class ShapeChooserPanel extends JPanel {

private int currentX;
private int currentY;
private Color currentColor;
private int currentShape;
private JButton clearBtn;
private JRadioButton circle, square, triangle, box;
private DrawingPanel drawingPanel;
private JPanel controlsPanel;
//constants representing shape choice
private final int CIRCLE = 0;
private final int SQUARE = 1;
private final int TRIANGLE = 2;
private final int BOX = 3;
//constant delta used for setting distance between points
private final int DELTA = 25;
private int[] Xs;
private int[] Ys;
//store all the shapes to be painted UNCOMMENT when you have Shape.java defined
ArrayList<Shape> shapes;

public ShapeChooserPanel(){
    //provide some default values paints a circle at (10,10) in blue
    currentX = 10;
    currentY = 10;
    Xs = new int[4];//we will use all 4 points for the square, but only the first 3 for the triangle
    Ys = new int[4];
    setPoints(currentX,currentY);
    currentShape = CIRCLE;
    currentColor = Color.red;
    shapes = new ArrayList<Shape>();
    //instantiate the controls panel and set its layout to display everything in a single column
    controlsPanel = new JPanel();
    controlsPanel.setLayout(new BoxLayout(controlsPanel, BoxLayout.Y_AXIS));


    //TODO: add clear button *
    // TODO: define radio buttons *

    clearBtn = new JButton("Clear");
    clearBtn.addActionListener(new ClearListener());

    circle = new JRadioButton("Red Circle");
    circle.addActionListener(new ShapeListener());

    square = new JRadioButton("Cyan Square");
    square.addActionListener(new ShapeListener());

    triangle = new JRadioButton("Green Triangle");
    triangle.addActionListener(new ShapeListener());

    box = new JRadioButton("Blue Box");
    box.addActionListener(new ShapeListener());

    ButtonGroup group = new ButtonGroup();
    group.add(clearBtn);
    group.add(circle);
    group.add(square);
    group.add(triangle);
    group.add(box);

    controlsPanel.add(clearBtn);
    controlsPanel.add(circle);
    controlsPanel.add(square);
    controlsPanel.add(triangle);
    controlsPanel.add(box);



    //TODO: add radio buttons to group *
    //TODO add listeners to radio buttons *
    //TODO: add radio buttons to controls panel *

    drawingPanel = new DrawingPanel();

    drawingPanel.setBorder(BorderFactory.createLineBorder(Color.black));
    //TODO: set a border around the drawing panel *
    drawingPanel.setPreferredSize(new Dimension(200,200));
    drawingPanel.addMouseListener(new PanelListener());

    add(drawingPanel);
    add(controlsPanel);
    setPreferredSize(new Dimension (300,400));
}//end constructor

public void setPoints(int x, int y) {
    //TODO: set Xs and Ys *

    for(int i = 0; i < 4; i++) {
        Xs[i] = x;
        Ys[i] = y;
    }

}

private class ClearListener implements ActionListener{
    public void actionPerformed(ActionEvent ae){
        shapes.removeAll(shapes);
        drawingPanel.repaint();
    }
}
private class PanelListener implements MouseListener {
    public void mouseClicked(MouseEvent me) {

        currentX = me.getX();
        currentY = me.getY();
        //TODO: find coordinates of this mouse click *

        //TODO: add a new shape to the shapes list*

        shapes.add(new Shape(currentX, currentY, SQUARE,Color.cyan));

        setPoints(currentX, currentY);
        //TODO: call setPoints with current x and y values *
        drawingPanel.repaint();
    }
    public void mouseExited(MouseEvent me){}
    public void mouseEntered(MouseEvent me){}
    public void mouseReleased(MouseEvent me){}
    public void mousePressed(MouseEvent me){}
}
//Class to listen for radio button changes
private class ShapeListener implements ActionListener{
    public void actionPerformed(ActionEvent me){
        //TODO: determine which radio button was clicked *

        if(me.getActionCommand().equals("Red Circle")){
            shapes.add(new Shape(currentX, currentY, CIRCLE, Color.red));

          }

          if (me.getActionCommand().equals("Cyan Square")){
              shapes.add(new Shape(currentX, currentY, SQUARE, Color.cyan));
          }

          if(me.getActionCommand().equals("Green Triangle")){
              shapes.add(new Shape(currentX, currentY, TRIANGLE, Color.green));

          }

          if(me.getActionCommand().equals("Blue Box")){
              shapes.add(new Shape(currentX, currentY, BOX, Color.blue));

          }


        //TODO: set current shape and color *
        drawingPanel.repaint();
    }
}

private class DrawingPanel extends JPanel {
    public void paintComponent(Graphics g) {
        super.paintComponent(g);

        //TODO: paint all the shapes in our list
    }
}
}

---

在DrawingPanel类中，需要一个类似于

addShape（…）

的方法，该方法将向ArrayList添加一个Shape对象。然后在

paintComponent（…）

方法中，迭代ArrayList以绘制列表中的每个形状

查看工作示例中的

绘制组件
示例

该示例仅绘制矩形，因此您的代码将更加复杂，因为您需要检查要绘制的形状类型。
在DrawingPanel类中，您需要类似于
addShape（…）
的方法，该方法将向ArrayList添加形状对象。然后在
paintComponent（…）
方法中，迭代ArrayList以绘制列表中的每个形状

查看工作示例中的
绘制组件
示例

该示例仅绘制矩形，因此您的代码将更加复杂，因为您需要检查要绘制的形状类型。
我们可以不继续发布相同的问题吗，您可能需要等待一段时间才能获得所需的答案我们可以不继续发布相同的问题吗，您可能需要等待一段时间才能得到所需的答案
import java.awt.Color;
 import java.awt.Graphics;

public class Shape  {

    private int x,y;
    private int type;
    private Color c;

    public Shape(int x, int y, int type, Color c) {
        this.x = x;
        this.y = y;
        this.type = type;
        this.c = c;

    }

    public int getX() {

        return x;
    }

    public int getY() {

        return y;
    }

    public int getType() {

        return type;
    }

    public Color getColor() {

        return c;
    }



}