通过单击它来更改绘图的颜色 AWT JAVA

Question

我想在此代码中添加通过单击更改绘图颜色的功能，但我不知道这是否会支持该代码

import java.awt.*;
import java.awt.event.*;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.swing.JButton;

public class TestGraphic {

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

    public TestGraphic() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                Frame frame = new Frame();
                frame.add(new Composants());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
                
                frame.addWindowListener((WindowListener) new WindowAdapter() {
                    @Override
                    public void windowClosing(WindowEvent windowEvent){
                       System.exit(0);
                    }        
                 });
               
            }
        });   
    }
    
    public class Composants extends Container {

        private Color color = Color.BLACK;
        private List<Color> avaliableColors = new ArrayList<>(16);

        public Composants() {
            setLayout(new BorderLayout());
           
            avaliableColors.add(Color.BLACK);
            avaliableColors.add(Color.BLUE);
            avaliableColors.add(Color.CYAN);
            avaliableColors.add(Color.DARK_GRAY);
            avaliableColors.add(Color.GRAY);
            avaliableColors.add(Color.GREEN);
            avaliableColors.add(Color.LIGHT_GRAY);
            avaliableColors.add(Color.MAGENTA);
            avaliableColors.add(Color.ORANGE);
            avaliableColors.add(Color.PINK);
            avaliableColors.add(Color.RED);
            avaliableColors.add(Color.WHITE);
            avaliableColors.add(Color.YELLOW);

            JButton btn = new JButton("Change color");
            btn.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    // Randomise the colors
                    Collections.shuffle(avaliableColors);
                    color = avaliableColors.get(0);
                    repaint();
                }
            });
            add(btn, BorderLayout.SOUTH);
            
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(600, 400);
        }
        public void close() {
            addComponentListener((ComponentListener) new WindowAdapter() {
                @Override
                public void windowClosing(WindowEvent windowEvent){
                   System.exit(0);
                }        
             });
        }

        @Override
        public void paint(Graphics gui) {
            super.paint(gui);
            Graphics2D g2d = (Graphics2D) gui.create();
            g2d.setColor(color);
            g2d.drawOval(108, 110, 200, 200);
            g2d.drawOval(160, 150, 20, 20);
            g2d.drawOval(240, 150, 20, 20);
            g2d.drawRect(160, 220, 100, 40);
            g2d.dispose();
        }
        
    }
}

我在互联网上找到的是创建 Rectangle 类和 Circle ，但如果我能在这里做到，那就太好了，谢谢。

我在互联网上找到的是创建 Rectangle 类和 Circle ，但如果我能在这里做到，那就太好了，谢谢。（重复提交）

Answer 1

见How to Write a Mouse Listener和Working with Geometry

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Shape;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ComponentListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import java.awt.geom.Area;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Rectangle2D;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.swing.JButton;

public class TestGraphic {

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

    public TestGraphic() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                Frame frame = new Frame();
                frame.add(new Composants());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);

                frame.addWindowListener((WindowListener) new WindowAdapter() {
                    @Override
                    public void windowClosing(WindowEvent windowEvent) {
                        System.exit(0);
                    }
                });

            }
        });
    }

    public class Composants extends Container {

        private Color color = Color.BLACK;
        private List<Color> avaliableColors = new ArrayList<>(16);
        private Shape face;

        public Composants() {
            setLayout(new BorderLayout());

            Area area = new Area();
            area.add(new Area(new Ellipse2D.Double(108, 110, 200, 200)));
            area.add(new Area(new Ellipse2D.Double(160, 150, 20, 20)));
            area.add(new Area(new Ellipse2D.Double(240, 150, 20, 20)));
            area.add(new Area(new Rectangle2D.Double(160, 220, 100, 40)));
            face = area;

            avaliableColors.add(Color.BLACK);
            avaliableColors.add(Color.BLUE);
            avaliableColors.add(Color.CYAN);
            avaliableColors.add(Color.DARK_GRAY);
            avaliableColors.add(Color.GRAY);
            avaliableColors.add(Color.GREEN);
            avaliableColors.add(Color.LIGHT_GRAY);
            avaliableColors.add(Color.MAGENTA);
            avaliableColors.add(Color.ORANGE);
            avaliableColors.add(Color.PINK);
            avaliableColors.add(Color.RED);
            avaliableColors.add(Color.WHITE);
            avaliableColors.add(Color.YELLOW);

            JButton btn = new JButton("Change color");
            btn.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    changeColor();
                }
            });
            add(btn, BorderLayout.SOUTH);

            addMouseListener(new MouseAdapter() {
                @Override
                public void mouseClicked(MouseEvent e) {
                    if (face.contains(e.getPoint())) {
                        changeColor();
                    }
                }
            });
        }

        protected void changeColor() {
            // Randomise the colors
            Collections.shuffle(avaliableColors);
            color = avaliableColors.get(0);
            repaint();
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(600, 400);
        }

        public void close() {
            addComponentListener((ComponentListener) new WindowAdapter() {
                @Override
                public void windowClosing(WindowEvent windowEvent) {
                    System.exit(0);
                }
            });
        }

        @Override
        public void paint(Graphics gui) {
            super.paint(gui);
            Graphics2D g2d = (Graphics2D) gui.create();
            g2d.setColor(color);
            g2d.drawOval(108, 110, 200, 200);
            g2d.drawOval(160, 150, 20, 20);
            g2d.drawOval(240, 150, 20, 20);
            g2d.drawRect(160, 220, 100, 40);
            g2d.dispose();
        }

    }
}

Answer 2

你应该尽量让你的问题更清楚。你是在问代码是否会改变圆形和矩形的颜色？

如果您运行此代码，您应该在第 76 行收到错误，因为您无法将“匿名 java.awt.event.WindowAdapter”强制转换为“java.awt.event.ComponentListener”。如果去掉close()方法，圆形和矩形的颜色会发生变化。