ADD file via upload

scr/tetris/PreparePanel.java

@@ -0,0 +1,43 @@
+package tetris;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.KeyAdapter;
+import java.awt.event.KeyEvent;
+
+public class PreparePanel extends JPanel {
+    private final ResourceManager res;
+    private Runnable startCallback;
+
+    public PreparePanel(Runnable startGame) {
+        this.res = ResourceManager.getInstance();
+        this.startCallback = startGame;
+        setPreferredSize(new Dimension(510, 650));
+        initControls();
+    }
+
+    private void initControls() {
+        addKeyListener(new KeyAdapter() {
+            @Override
+            public void keyPressed(KeyEvent e) {
+                if (e.getKeyCode() == KeyEvent.VK_SPACE) {
+                    res.stopPrepareMusic();
+                    startCallback.run();
+                }
+            }
+        });
+        setFocusable(true);
+    }
+
+    @Override
+    protected void paintComponent(Graphics g) {
+        super.paintComponent(g);
+        g.drawImage(res.getPrepareBackground(), 0, 0, getWidth(), getHeight(), this);
+
+        g.setColor(Color.WHITE);
+        g.setFont(new Font("微软雅黑", Font.BOLD, 24));
+        String text = "按空格键开始游戏";
+        int textWidth = g.getFontMetrics().stringWidth(text);
+        g.drawString(text, (getWidth() - textWidth) / 2, getHeight() - 80);
+    }
+}