Question

当前，我正在使用Java开发Paint程序。发生错误，出现了两个问题。

MouseListener不起作用（如果我单击它，应设置Color，但不起作用）。
如何用光标在绘图区域上绘画。如果mousePressed == true-在鼠标位置绘制。如果mouseReleased == true-停止绘制。
如何获取光标相对于框架的位置。到此为止，它占据了整个屏幕。

主要类别：

import java.awt.Canvas;
import java.awt.Dimension;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.Icon;
import javax.swing.JFrame;

public class Main extends Canvas {

    static int WIDTH = 830, HEIGHT = 1440;
    static String TITLE = "Paint";
    static Canvas canvas;

    public static void main(String [] args) {
        createWindow();
        start();
    }

    private static void start() {
        //Start class Draw
        Draw draw = new Draw();
        draw.start();
    }

    private static void createWindow() {
        //Initialize the main frame
        JFrame frame = new JFrame(TITLE);
        frame.setSize(WIDTH,HEIGHT);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setResizable(true);
        frame.setVisible(true);

        //Create canvas
        canvas = new Canvas();
        canvas.setPreferredSize(new Dimension(WIDTH,HEIGHT));
        canvas.setMaximumSize(new Dimension(WIDTH,HEIGHT));
        canvas.setMinimumSize(new Dimension(WIDTH, HEIGHT));

        frame.add(canvas);
        frame.pack();
    }

    public static Canvas getCanvas() {
        return canvas;
    }
}
import java.awt.Canvas;
import java.awt.Dimension;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.Icon;
import javax.swing.JFrame;

public class Main extends Canvas {

    static int WIDTH = 830, HEIGHT = 1440;
    static String TITLE = "Paint";
    static Canvas canvas;

    public static void main(String [] args) {
        createWindow();
        start();
    }

    private static void start() {
        //Start class Draw
        Draw draw = new Draw();
        draw.start();
    }

    private static void createWindow() {
        //Initialize the main frame
        JFrame frame = new JFrame(TITLE);
        frame.setSize(WIDTH,HEIGHT);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setResizable(true);
        frame.setVisible(true);

        //Create canvas
        canvas = new Canvas();
        canvas.setPreferredSize(new Dimension(WIDTH,HEIGHT));
        canvas.setMaximumSize(new Dimension(WIDTH,HEIGHT));
        canvas.setMinimumSize(new Dimension(WIDTH, HEIGHT));

        frame.add(canvas);
        frame.pack();
    }

    public static Canvas getCanvas() {
        return canvas;
    }
}
import java.awt.Canvas;
import java.awt.Dimension;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.Icon;
import javax.swing.JFrame;

public class Main extends Canvas {

    static int WIDTH = 830, HEIGHT = 1440;
    static String TITLE = "Paint";
    static Canvas canvas;

    public static void main(String [] args) {
        createWindow();
        start();
    }

    private static void start() {
        //Start class Draw
        Draw draw = new Draw();
        draw.start();
    }

    private static void createWindow() {
        //Initialize the main frame
        JFrame frame = new JFrame(TITLE);
        frame.setSize(WIDTH,HEIGHT);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setResizable(true);
        frame.setVisible(true);

        //Create canvas
        canvas = new Canvas();
        canvas.setPreferredSize(new Dimension(WIDTH,HEIGHT));
        canvas.setMaximumSize(new Dimension(WIDTH,HEIGHT));
        canvas.setMinimumSize(new Dimension(WIDTH, HEIGHT));

        frame.add(canvas);
        frame.pack();
    }

    public static Canvas getCanvas() {
        return canvas;
    }
}

绘画班：

import java.awt.Color;
import java.awt.Graphics;
import java.awt.MouseInfo;
import java.awt.event.KeyEvent;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.image.BufferStrategy;
import java.awt.image.BufferedImage;

public class Draw extends Main implements Runnable{

    static boolean running = false;

    public Thread thread;

    int mouseX, mouseY;
    boolean mousePressed = false ,mouseReleased = false;

    String COLOR, transitionColor;

    private BufferStrategy bs;
    private Graphics g;

    public synchronized void start() {
        if(running)return;
        running = true;

        thread = new Thread(this);
        thread.start();
    }

    public synchronized void stop() {
        if(!running)return;
        running = false;
        try {
            thread.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void run() {

        init();

        while(running == true) {
            update();   
            render();
        }
        stop();
    }

    private void init() {

    }

    private void update() {
        mouseX = MouseInfo.getPointerInfo().getLocation().x;
        mouseY = MouseInfo.getPointerInfo().getLocation().y;

        if(mouseY <= 96) {
            if(mouseX <= 50) {
                transitionColor = "GREEN";
            }else if(mouseX <= 100 && mouseX >= 50) {
                transitionColor = "BLUE";
            }else if(mouseX <= 150 && mouseX >= 100) {
                transitionColor = "RED";
            }
            if(mouseY >= 96 && mouseX >= 150) {
                transitionColor = "NULL";
            }
        }
    }

    private void render() {
        bs = Main.getCanvas().getBufferStrategy();
        if(bs == null) {
            Main.getCanvas().createBufferStrategy(3);
            return;
        }

        g = bs.getDrawGraphics();

        //Clear Screen
        g.clearRect(0, 0, WIDTH, 50);
        g.clearRect(0, 750, WIDTH, 50);

        //----Draw-----

        g.setColor(Color.WHITE);
        g.fillRect(0, 50, WIDTH, 680);

        g.setColor(Color.GREEN);
        g.fillRect(0, 0, 50, 50);

        g.setColor(Color.BLUE);
        g.fillRect(50, 0, 50, 50);

        g.setColor(Color.RED);
        g.fillRect(100, 0, 50, 50);

        g.setColor(Color.BLACK);
        g.drawString("X: " + mouseX + " Y:" + mouseY + " Color: " + COLOR , 10, 760);

        g.drawString("mousePressed: " + mousePressed , 620, 750);
        g.drawString("mouseReleased: " + mouseReleased , 620, 765);
        //-------------

        bs.show();
        g.dispose();

    }

    class CustomMouseListener implements MouseListener {

        @Override
        public void mouseClicked(MouseEvent e) {
            COLOR = transitionColor;
        }

        @Override
        public void mousePressed(MouseEvent e) {
            mousePressed = true;
            mouseReleased = false;

        }

        @Override
        public void mouseReleased(MouseEvent e) {
            mouseReleased = true;
            mousePressed = false;

        }

        @Override
        public void mouseEntered(MouseEvent e) {
            // TODO Auto-generated method stub

        }

        @Override
        public void mouseExited(MouseEvent e) {
            // TODO Auto-generated method stub

        }

    }
}

预先感谢

MouseListener不起作用，还有2个问题。爪哇

0 个答案: