java按一个按钮改变方块的大小

Question

嗨，我想通过放一个按钮来改变我的方块的大小，让它的名字加上它，例如，如果我的方块是1cm * 1cm加上按钮使其为10cm * 10cm我做了一些单位（）测试它是否有效，但它没有说它在AddSquare中的那些变量在Compenent中不公开这里的代码让你看看我现在拥有的东西：

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;

import javax.swing.*;

public class Carre extends JFrame implements ActionListener {

    JButton boutPlus, boutMoins, boutCouleur;
    Squares squares;

    public void paintComponent(Graphics g) {      
        Graphics2D g2 = (Graphics2D) g;
    }
    public Carre() {
        super("Carre");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        squares = new Squares();
        getContentPane().add(squares);
        //for (int i = 0; i < 1; i++) {
        squares.addSquare(10, 10, 100, 100);

        Insets insets = getInsets();
        System.out.println("insets.left = " + insets.left);
        System.out.println("insets.right = " + insets.right);
        System.out.println("insets.top = " + insets.top);
        System.out.println("insets.bottom = " + insets.bottom);

        pack();
        setLocationRelativeTo(null);
        setVisible(true);

        JPanel simplePanel = new JPanel();
        simplePanel.setLayout(null);
        add(simplePanel);
        boutPlus = new JButton("PLUS");

        boutPlus.setForeground(Color.white);
        boutPlus.setBackground(new Color(63, 107, 220));
        simplePanel.add(boutPlus);
        boutPlus.setBounds(325, 50, 200, 80);
        boutPlus.addActionListener(this);

        boutMoins = new JButton("MOINS");

        boutMoins.setForeground(Color.white);
        boutMoins.setBackground(new Color(145, 110, 220));
        simplePanel.add(boutMoins);
        boutMoins.setBounds(325, 150, 200, 80);
        boutMoins.addActionListener(this);

        boutCouleur = new JButton("COULEUR");

        boutCouleur.setForeground(Color.white);
        boutCouleur.setBackground(new Color(150, 200, 80));
        simplePanel.add(boutCouleur);
        boutCouleur.setBounds(325, 250, 200, 80);
        boutCouleur.addActionListener(this);
    }

    public static void main(String[] args) {
        new Carre();
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == boutPlus) {
            squares.augmenter();
        }
        if (e.getSource() == boutMoins && squares.diminuer()< Double.MIN_VALUE ) { throw new HorsLimitException ();
            squares.diminuer();
        }
        if (e.getSource() == boutCouleur) {
            Graphics g=null;
            Graphics2D g2 = (Graphics2D) g;
            g2.setColor(Color.YELLOW);
            g2.fillRect(10,20,100,150);

        }
    }
}

class Squares extends JPanel {

    private static final int PREF_W = 500;
    private static final int PREF_H = PREF_W;
    private List<Rectangle> squares = new ArrayList<Rectangle>();

    public void addSquare(int x, int y, int width, int height) {
        Rectangle rect = new Rectangle(x, y, width, height);
        squares.add(rect);
    }

    @Override
    public Dimension getPreferredSize() {
        return new Dimension(PREF_W, PREF_H);
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g;
        for (Rectangle rect : squares) {
            g2.draw(rect);
        }
    }

    public void diminuer() {
        int x = 0;
        squares.addSquare(x - 10);

    }

    public void augmenter() {
        int x = 0;
        squares.addSquare(x - 10);

    }

}
class HorsLimitException  extends  ArithmeticException {

        public HorsLimitException ()      {    //constructeur  par défaut
             super( "Tentative de d\u00e9passement de limite" );
           }

        public HorsLimitException ( String message )     {
             super( message );  
           }
}

Answer 1

您没有将足够的参数传递给addSquare（）方法，并且您尝试使用不存在的ArrayList来调用它。方法addSquare（）仅适用于Squares类。

public void diminuer() {
    int x = 0;
    squares.addSquare(x - 10); //too few parameters for your method
}

addSquare（）方法有4个参数

public void addSquare(int x, int y, int width, int height)

您应该抓住添加到列表中的最后一个方块，并根据这些尺寸创建新方块。但是没有给出Rectangle类，所以我不知道如何检索成员变量，但是你可以为diminuer（）方法执行类似的操作

public void diminuer() {
    if(squares.size() > 0)
    {
        Rectangle obj = squares.get(squares.size() - 1);
        addSquare(obj.x * 10, obj.y * 10, obj.width * 10, obj.height * 10);
    }
}