乒乓球游戏：C++ GDExtension 实现

src/pingpong_paddle.cpp

@@ -0,0 +1,110 @@
+#include "pingpong_paddle.h"
+
+#include <godot_cpp/core/class_db.hpp>
+#include <godot_cpp/classes/input.hpp>
+#include <godot_cpp/classes/engine.hpp>
+#include <godot_cpp/classes/node.hpp>
+#include <godot_cpp/classes/scene_tree.hpp>
+#include <godot_cpp/classes/viewport.hpp>
+
+using namespace godot;
+
+void PingPongPaddle::_bind_methods() {
+    // 属性
+    ClassDB::bind_method(D_METHOD("get_speed"), &PingPongPaddle::get_speed);
+    ClassDB::bind_method(D_METHOD("set_speed", "value"), &PingPongPaddle::set_speed);
+    ClassDB::add_property("PingPongPaddle", PropertyInfo(Variant::FLOAT, "speed"), "set_speed", "get_speed");
+
+    ClassDB::bind_method(D_METHOD("get_is_player"), &PingPongPaddle::get_is_player);
+    ClassDB::bind_method(D_METHOD("set_is_player", "value"), &PingPongPaddle::set_is_player);
+    ClassDB::add_property("PingPongPaddle", PropertyInfo(Variant::BOOL, "is_player"), "set_is_player", "get_is_player");
+
+    ClassDB::bind_method(D_METHOD("get_ball_path"), &PingPongPaddle::get_ball_path);
+    ClassDB::bind_method(D_METHOD("set_ball_path", "value"), &PingPongPaddle::set_ball_path);
+    ClassDB::add_property("PingPongPaddle", PropertyInfo(Variant::NODE_PATH, "ball_path"), "set_ball_path", "get_ball_path");
+}
+
+PingPongPaddle::PingPongPaddle() {
+    speed = 350.0f;
+    is_player = true;
+}
+
+PingPongPaddle::~PingPongPaddle() {
+}
+
+void PingPongPaddle::_draw() {
+    // 画一个白色矩形表示球拍
+    draw_rect(Rect2(Vector2(-10.0f, -60.0f), Vector2(20.0f, 120.0f)), Color(1.0f, 1.0f, 1.0f));
+}
+
+void PingPongPaddle::_physics_process(double delta) {
+    queue_redraw();
+    float move_amount = 0.0f;
+
+    if (is_player) {
+        // 玩家控制：读取上下输入
+        Input *input = Input::get_singleton();
+        if (input->is_action_pressed("ui_up")) {
+            move_amount = -1.0f;
+        } else if (input->is_action_pressed("ui_down")) {
+            move_amount = 1.0f;
+        }
+    } else {
+        // AI 控制：追踪球的位置
+        if (!ball_path.is_empty()) {
+            Node *node = get_node_or_null(ball_path);
+            if (node) {
+                Node2D *ball = Object::cast_to<Node2D>(node);
+                if (ball) {
+                    float ball_y = ball->get_global_position().y;
+                    float paddle_y = get_global_position().y;
+                    if (ball_y < paddle_y - 20.0f) {
+                        move_amount = -1.0f;
+                    } else if (ball_y > paddle_y + 20.0f) {
+                        move_amount = 1.0f;
+                    }
+                }
+            }
+        }
+    }
+
+    // 移动
+    Vector2 velocity = Vector2(0.0f, move_amount * speed * (float)delta);
+    move_and_collide(velocity);
+
+    // 限制移动范围（不超出屏幕）
+    Viewport *viewport = get_viewport();
+    if (viewport) {
+        Vector2 screen_size = viewport->get_visible_rect().size;
+        Vector2 pos = get_global_position();
+        if (pos.y < half_height) {
+            set_global_position(Vector2(pos.x, half_height));
+        } else if (pos.y > screen_size.y - half_height) {
+            set_global_position(Vector2(pos.x, screen_size.y - half_height));
+        }
+    }
+}
+
+void PingPongPaddle::set_speed(float p_speed) {
+    speed = p_speed;
+}
+
+float PingPongPaddle::get_speed() const {
+    return speed;
+}
+
+void PingPongPaddle::set_is_player(bool p_is_player) {
+    is_player = p_is_player;
+}
+
+bool PingPongPaddle::get_is_player() const {
+    return is_player;
+}
+
+void PingPongPaddle::set_ball_path(const NodePath &p_path) {
+    ball_path = p_path;
+}
+
+NodePath PingPongPaddle::get_ball_path() const {
+    return ball_path;
+}