feat(camera): 为相机组件添加简化的正交投影设置方法

添加一个接受宽高参数的 `setOrtho` 重载方法，以简化常见2D场景下的相机设置。同时更新示例代码以使用新方法，使代码更简洁易读。

examples/image_display_demo/main.cpp

@@ -40,7 +40,7 @@ private:
     cameraNode->setName("MainCamera");
     cameraNode->setPosition(0.0f, 0.0f);
     auto camera = makePtr<CameraComponent>();
-    camera->setOrtho(0.0f, 1280.0f, 720.0f, 0.0f, -1.0f, 1.0f);
+    camera->setOrtho(1280.0f, 720.0f);
     cameraNode->addComponent(camera);
     setMainCamera(camera);
     addChild(cameraNode);
@@ -72,21 +72,12 @@ int main(int argc, char **argv) {
     return -1;
   }
 
-  SceneModule *sceneModule = app->getModule<SceneModule>();
-  if (!sceneModule) {
-    printf("获取场景模块失败！\n");
-    return -1;
-  }
-
-  Director *director = sceneModule->getDirector();
+  auto director = app->getModule<SceneModule>()->getDirector();
   if (!director) {
     printf("获取导演器失败！\n");
     return -1;
   }
-
-  auto scene = makePtr<ImageDisplayScene>();
-  director->runScene(scene);
-
+  director->runScene(makePtr<ImageDisplayScene>());
   app->run();
   return 0;
 }

examples/scene_graph_demo/README.md

@@ -90,7 +90,7 @@ node->addComponent(sprite);
 ### 设置相机
 ```cpp
 auto camera = makePtr<CameraComponent>();
-camera->setOrtho(0, 1280, 0, 720, -1, 1);
+camera->setOrtho(1280, 720);
 cameraNode->addComponent(camera);
 scene->setMainCamera(camera);
 ```

examples/scene_graph_demo/game_scene.cpp

@@ -157,7 +157,7 @@ void GameScene::createCamera() {
   auto camera = makePtr<CameraComponent>();
   // 使用标准的2D投影：左上角为(0, 0)，右下角为(1280, 720)
   // Y轴向下：bottom=720, top=0
-  camera->setOrtho(0.0f, 1280.0f, 720.0f, 0.0f, -1.0f, 1.0f);
+  camera->setOrtho(1280.0f, 720.0f);
   cameraNode->addComponent(camera);
 
   // 设置为主相机

include/scene/components/camera_component.h

@@ -51,6 +51,15 @@ public:
      */
     ProjectionType getProjectionType() const { return projType_; }
 
+    /**
+     * @brief 设置正交投影
+     * @param width 逻辑宽度
+     * @param height 逻辑高度
+     * @param near 近裁剪面
+     * @param far 远裁剪面
+     */
+    void setOrtho(float width, float height, float near = -1.0f, float far = 1.0f);
+
     /**
      * @brief 设置正交投影
      * @param left 左边界

src/scene/components/camera_component.cpp

@@ -13,7 +13,11 @@ namespace extra2d {
  *
  * 创建一个默认的正交相机，视口范围为 (0, 0) 到 (800, 600)
  */
-CameraComponent::CameraComponent() { setOrtho(0, 800, 600, 0, -1, 1); }
+CameraComponent::CameraComponent() { setOrtho(800.0f, 600.0f); }
+
+void CameraComponent::setOrtho(float width, float height, float near, float far) {
+  setOrtho(0.0f, width, height, 0.0f, near, far);
+}
 
 /**
  * @brief 设置投影类型