Question

我正在尝试制作一个带有正方形的虚拟标签。现在，我专注于让游戏结束，然后当第二位玩家赶上另一位玩家时关闭游戏。但是，当两个正方形发生碰撞时，程序不会在屏幕上写入任何内容。

我知道调用g.drawString的if语句是有效的，因为在这里使它两次输出到控制台，所以我对为什么g.drawString不起作用感到困惑。

package com.Arman;

import javax.swing.*;
import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.util.HashSet;

public class Virtual_Tag {

    static int x1 = 0;
    static int y1 = 0;
    static Dimension dimension = Toolkit.getDefaultToolkit().getScreenSize();
    static int height = (int) dimension.getHeight();
    static int width = (int) dimension.getWidth();
    static int sWidth = (int) (Math.round(100 * width / 1366.0));
    static int sHeight = (int) (Math.round(100 * height / 768.0));
    static int x2 = width - sWidth;
    static int y2 = height - sHeight;
    static myGraphicsPanel graphics = new myGraphicsPanel();
    static boolean[] move = new boolean[8];
    static int xSpeed1;
    static int ySpeed1;
    static int xSpeed2;
    static int ySpeed2;
    static boolean xcol, ycol;
    static JFrame frame = new JFrame();

    public static void main(String[] args) throws Exception {
        frame.setSize(width, height);
        JPanel left = new JPanel();
        JTextField text1 = new JTextField();
        text1.addKeyListener(new keyListener());
        left.add(text1);
        JTextField text2 = new JTextField();
        text2.addKeyListener(new keyListener());
        JPanel right = new JPanel();
        right.add(text2);
        frame.add(left);
        frame.add(right);
        frame.add(graphics);
        frame.setVisible(true);
        while (!xcol || !ycol) {
            keyListener.move();
            x1 += xSpeed1;
            x2 += xSpeed2;
            y1 += ySpeed1;
            y2 += ySpeed2;
            int s1 = x1;
            int e1 = x1 + sWidth;
            int s2 = x2;
            int e2 = x2 + sWidth;
            xcol = (s1 <= s2 && s2 <= e1) || (s1 <= e2 && e2 <= e1);
            s1 = y1;
            e1 = y1 + sHeight;
            s2 = y2;
            e2 = y2 + sHeight;
            ycol = (s1 <= s2 && s2 <= e1) || (s1 <= e2 && e2 <= e1);
            Thread.sleep(10);
            frame.repaint();
        }
        Thread.sleep(1000);
        System.exit(0);
    }

    static class keyListener extends KeyAdapter {
        private HashSet<Integer> pressed = new HashSet<>();
        private final int[] KEYS = {KeyEvent.VK_W, KeyEvent.VK_A, KeyEvent.VK_D, KeyEvent.VK_S, KeyEvent.VK_DOWN,
            KeyEvent.VK_LEFT, KeyEvent.VK_RIGHT, KeyEvent.VK_UP};

        public static void move() {
            ySpeed1 = 0;
            xSpeed1 = 0;
            ySpeed2 = 0;
            xSpeed2 = 0;
            if (move[0]) ySpeed1 -= 10;
            if (move[1]) xSpeed1 -= 10;
            if (move[2]) xSpeed1 += 10;
            if (move[3]) ySpeed1 += 10;
            if (move[4]) ySpeed2 += 10;
            if (move[5]) xSpeed2 -= 10;
            if (move[6]) xSpeed2 += 10;
            if (move[7]) ySpeed2 -= 10;
        }

        public void keyPressed(KeyEvent e) {
            pressed.add(e.getKeyCode());
            for (int f : pressed) {
                boolean found = false;
                for (int i = 0; i < 8 && !found; i++) {
                    if (f == KEYS[i]) {
                        move[i] = true;
                        found = true;
                    }
                }
            }
        }

        public void keyReleased(KeyEvent e) {
            boolean found = false;
            for (int i = 0; i < 8 && !found; i++) {
                if (e.getKeyCode() == KEYS[i]) {
                    move[i] = false;
                    found = true;
               }
           }
            pressed.remove(e.getKeyCode());
        }

        public void keyTyped(KeyEvent e) {
            // not used
        }
    }

    static class myGraphicsPanel extends JPanel {
        public void paintComponent(Graphics g) {
            g.setColor(Color.BLUE);
            g.fillRect(x1, y1, 100, 100);
            g.setColor(Color.RED);
            g.fillRect(x2, y2, 100, 100);
            if (xcol && ycol) {
                g.setFont(new Font("Verdana", Font.PLAIN, 36));
                g.drawString("Game Over!", 0, 0);
                System.out.println("Made it here");
            }
        }
    }
}

Answer 1

更改打印坐标以将字符串左右移动。尝试200,200。

此外，您应该执行以下操作：

摆脱静态语句。
然后将main中的代码移至方法start()中。然后您可以调用您的通过执行以下程序：

  new VirtualTag().start();

通常，您应按以下步骤在main中启动程序：

 SwingUtilities.invokeLater(()->new Virtual_Tag().start());

但是在这种情况下，这是行不通的，因为您将不断循环进入Event Dispatch Thread，并且不会被涂上任何东西。

在 https://docs.oracle.com/javase/tutorial/index.html

g.drawString在两个方块碰撞时未绘制游戏结束

1 个答案: