feat(act): 改进动作系统的更新逻辑和功能

- 重构动作序列(Seq)的step方法，支持更精确的时间分割处理
- 为Spawn和Repeat动作添加step方法实现
- 改进RepeatForever的step方法，防止无限循环
- 为MoveTo/MoveBy动作添加标签复制功能
- 在Node类中暴露comps_成员给SceneGraph访问
- 修复测试用例中的动作调用方式
- 添加Vec2的乘法运算符重载

Extra2D/include/extra2d/act/act.h

@@ -32,6 +32,8 @@ protected:
     Node* target_ = nullptr;
     Node* origTarget_ = nullptr;
     i32 tag_ = -1;
+    
+    void copyTagTo(Act* other) const { other->tag_ = tag_; }
 };
 
 class ActInstant : public Act {

Extra2D/include/extra2d/act/act_composite.h

@@ -54,6 +54,7 @@ public:
 
     void start(Node* t) override;
     void stop() override;
+    void step(f32 dt) override;
     void update(f32 t) override;
     Act* clone() const override;
     Act* reverse() const override;
@@ -72,6 +73,7 @@ public:
     bool done() const override;
     void start(Node* t) override;
     void stop() override;
+    void step(f32 dt) override;
     void update(f32 t) override;
     Act* clone() const override;
     Act* reverse() const override;

Extra2D/include/extra2d/act/act_move.h

@@ -21,8 +21,16 @@ public:
         }
     }
 
-    Act* clone() const override { return new MoveTo(dur_, end_); }
+    Act* clone() const override { 
-    Act* reverse() const override { return new MoveTo(dur_, start_); }
+        auto* c = new MoveTo(dur_, end_); 
+        copyTagTo(c);
+        return c;
+    }
+    Act* reverse() const override { 
+        auto* r = new MoveTo(dur_, start_); 
+        copyTagTo(r);
+        return r;
+    }
 
 private:
     Vec2 start_;
@@ -44,8 +52,16 @@ public:
         }
     }
 
-    Act* clone() const override { return new MoveBy(dur_, dlt_); }
+    Act* clone() const override { 
-    Act* reverse() const override { return new MoveBy(dur_, -dlt_); }
+        auto* c = new MoveBy(dur_, dlt_); 
+        copyTagTo(c);
+        return c;
+    }
+    Act* reverse() const override { 
+        auto* r = new MoveBy(dur_, -dlt_); 
+        copyTagTo(r);
+        return r;
+    }
 
 private:
     Vec2 dlt_;

Extra2D/include/extra2d/act/act_scale.h

@@ -42,7 +42,7 @@ public:
 
     void update(f32 t) override {
         if (target_) {
-            target_->scale = start_ + dlt_ * t;
+            target_->scale = start_ * Vec2::lerp(Vec2(1, 1), dlt_, t);
         }
     }
 

Extra2D/include/extra2d/core/math_types.h

@@ -35,6 +35,7 @@ struct Vec2 {
   Vec2 operator-(const Vec2 &v) const { return {x - v.x, y - v.y}; }
   Vec2 operator*(float s) const { return {x * s, y * s}; }
   Vec2 operator/(float s) const { return {x / s, y / s}; }
+  Vec2 operator*(const Vec2 &v) const { return {x * v.x, y * v.y}; }
   Vec2 operator-() const { return {-x, -y}; }
 
   Vec2 &operator+=(const Vec2 &v) {

Extra2D/include/extra2d/node/node.h

@@ -51,6 +51,7 @@ protected:
 };
 
 class Node : public std::enable_shared_from_this<Node> {
+    friend class SceneGraph;
 public:
     virtual ~Node();
 
@@ -150,8 +151,6 @@ public:
 
 protected:
     virtual Vec2 defaultAnchor() const { return Vec2(0.5f, 0.5f); }
-
-private:
     std::vector<Unique<Comp>> comps_;
     Node* parent_ = nullptr;
     std::vector<Ref<Node>> children_;

Extra2D/src/act/act_composite.cpp

@@ -36,6 +36,7 @@ Seq* Seq::createFromArray(std::initializer_list<Act*> acts) {
 void Seq::start(Node* t) {
     ActInterval::start(t);
     curIdx_ = 0;
+    split_ = 0.0f;
     if (!acts_.empty()) {
         acts_[0]->start(t);
     }
@@ -56,22 +57,32 @@ void Seq::step(f32 dt) {
 
     elap_ += dt;
     
-    while (curIdx_ < acts_.size()) {
+    f32 remainingDt = dt;
+    
+    while (curIdx_ < acts_.size() && remainingDt > 0) {
         auto* cur = acts_[curIdx_];
         if (auto* interval = dynamic_cast<ActInterval*>(cur)) {
-            interval->step(dt);
+            f32 neededDt = interval->dur() - interval->elap();
-            if (!interval->done()) {
+            if (remainingDt >= neededDt) {
-                return;
+                interval->step(neededDt);
-            }
+                remainingDt -= neededDt;
                 cur->stop();
-        } else {
-            cur->step(dt);
-        }
-        
                 curIdx_++;
                 if (curIdx_ < acts_.size()) {
                     acts_[curIdx_]->start(target_);
                 }
+            } else {
+                interval->step(remainingDt);
+                remainingDt = 0;
+            }
+        } else {
+            cur->step(remainingDt);
+            remainingDt = 0;
+            curIdx_++;
+            if (curIdx_ < acts_.size()) {
+                acts_[curIdx_]->start(target_);
+            }
+        }
     }
 }
 
@@ -143,6 +154,20 @@ void Spawn::stop() {
     ActInterval::stop();
 }
 
+void Spawn::step(f32 dt) {
+    elap_ += dt;
+    
+    for (auto* a : acts_) {
+        if (auto* interval = dynamic_cast<ActInterval*>(a)) {
+            if (!interval->done()) {
+                interval->step(dt);
+            }
+        } else {
+            a->step(dt);
+        }
+    }
+}
+
 void Spawn::update(f32 t) {
     for (auto* a : acts_) {
         if (auto* interval = dynamic_cast<ActInterval*>(a)) {
@@ -211,6 +236,27 @@ void Repeat::stop() {
     ActInterval::stop();
 }
 
+void Repeat::step(f32 dt) {
+    if (!inner_) {
+        elap_ = dur_;
+        return;
+    }
+    
+    elap_ += dt;
+    
+    if (auto* interval = dynamic_cast<ActInterval*>(inner_)) {
+        interval->step(dt);
+        
+        if (interval->done()) {
+            cnt_++;
+            if (!done()) {
+                inner_->stop();
+                inner_->start(target_);
+            }
+        }
+    }
+}
+
 void Repeat::update(f32 t) {
     if (!inner_) return;
     
@@ -250,18 +296,31 @@ void RepeatForever::start(Node* t) {
 void RepeatForever::step(f32 dt) {
     if (!inner_) return;
     
-    elap_ += dt;
-    
     if (dur_ > 0) {
-        while (elap_ >= dur_) {
+        f32 remainingDt = dt;
-            elap_ -= dur_;
+        int maxIterations = 100;
+        int iterations = 0;
+        
+        while (remainingDt > 0.0001f && iterations < maxIterations) {
+            iterations++;
+            if (auto* interval = dynamic_cast<ActInterval*>(inner_)) {
+                f32 neededDt = interval->dur() - interval->elap();
+                if (neededDt < 0.0001f) {
+                    neededDt = interval->dur();
+                }
+                if (remainingDt >= neededDt) {
+                    interval->step(neededDt);
+                    remainingDt -= neededDt;
                     inner_->stop();
                     inner_->start(target_);
+                } else {
+                    interval->step(remainingDt);
+                    remainingDt = 0;
+                }
+            } else {
+                inner_->step(remainingDt);
+                remainingDt = 0;
             }
-        
-        if (auto* interval = dynamic_cast<ActInterval*>(inner_)) {
-            f32 t = elap_ / dur_;
-            interval->update(interval->easeTime(t));
         }
     }
 }

Extra2D/src/node/node.cpp

@@ -31,11 +31,7 @@ Mat3 Node::local() const {
     Mat3 m(1.0f);
     
     m = glm::translate(m, pos.toGlm());
-    
+    m = glm::rotate(m, rot * DEG_TO_RAD);
-    m = glm::translate(m, glm::vec2(anchor.x * scale.x, anchor.y * scale.y));
-    m = glm::rotate(m, rot);
-    m = glm::translate(m, glm::vec2(-anchor.x * scale.x, -anchor.y * scale.y));
-    
     m = glm::scale(m, scale.toGlm());
     
     return m;

Extra2D/src/node/scene_graph.cpp

@@ -74,6 +74,7 @@ void SceneGraph::traverseRecursive(Node* node, const std::function<void(Node*)>&
 void SceneGraph::update(f32 dt) {
     traverse([dt](Node* node) {
         node->onUpdate(dt);
+        node->updateActs(dt);
         node->updateComps(dt);
         node->lateUpdateComps(dt);
     });

Tests/test_action.cpp

@@ -378,13 +378,13 @@ TEST(Seq, Sequence) {
     
     seq->start(node.get());
     
-    seq->update(0.0f);
+    seq->step(0.0f);
     TEST_ASSERT_TRUE(vec2Equal(node->pos, Vec2(0, 0)));
     
-    seq->update(0.5f);
+    seq->step(0.5f);
     TEST_ASSERT_TRUE(vec2Equal(node->pos, Vec2(100, 0)));
     
-    seq->update(0.5f);
+    seq->step(0.5f);
     TEST_ASSERT_TRUE(vec2Equal(node->pos, Vec2(100, 100)));
     
     TEST_ASSERT_TRUE(seq->done());
@@ -402,7 +402,7 @@ TEST(Seq, SingleAction) {
     
     seq->start(node.get());
     
-    seq->update(0.5f);
+    seq->step(0.5f);
     TEST_ASSERT_TRUE(vec2Equal(node->pos, Vec2(100, 0)));
     
     TEST_ASSERT_TRUE(seq->done());
@@ -426,11 +426,11 @@ TEST(Spawn, Parallel) {
     
     spawn->start(node.get());
     
-    spawn->update(0.5f);
+    spawn->step(0.5f);
     TEST_ASSERT_TRUE(vec2Equal(node->pos, Vec2(50, 50)));
     TEST_ASSERT_TRUE(std::abs(node->rot - 45.0f) < EPSILON);
     
-    spawn->update(0.5f);
+    spawn->step(0.5f);
     TEST_ASSERT_TRUE(vec2Equal(node->pos, Vec2(100, 100)));
     TEST_ASSERT_TRUE(std::abs(node->rot - 90.0f) < EPSILON);
     
@@ -452,7 +452,7 @@ TEST(Repeat, RepeatTimes) {
     repeat->start(node.get());
     
     for (int i = 0; i < 3; ++i) {
-        repeat->update(0.5f);
+        repeat->step(0.5f);
     }
     
     TEST_ASSERT_TRUE(vec2Equal(node->pos, Vec2(300, 0)));
@@ -474,7 +474,7 @@ TEST(RepeatForever, NeverDone) {
     repeat->start(node.get());
     
     for (int i = 0; i < 10; ++i) {
-        repeat->update(1.0f);
+        repeat->step(1.0f);
         TEST_ASSERT_FALSE(repeat->done());
     }
     
@@ -617,6 +617,6 @@ TEST(ActInterval, CustomEasing) {
     act.ease([](f32 t) { return t * t * t; });
     act.start(node.get());
     
-    act.update(0.5f);
+    act.step(0.5f);
     TEST_ASSERT_TRUE(std::abs(node->pos.x - 12.5f) < EPSILON);
 }

Tests/test_scene.cpp

@@ -267,13 +267,22 @@ TEST(Director, MultipleSceneSwitches) {
     scene1->setName("Scene1");
     director.run(scene1);
     
+    std::vector<Ref<TestScene>> scenes;
+    scenes.push_back(scene1);
+    
     for (int i = 0; i < 5; ++i) {
         auto newScene = ptr::make<TestScene>();
         newScene->setName("Scene" + std::to_string(i + 2));
         director.replace(newScene);
+        scenes.push_back(newScene);
     }
     
-    TEST_ASSERT_EQ(5, scene1->exitCount);
+    TEST_ASSERT_EQ(1, scenes[0]->exitCount);
+    TEST_ASSERT_EQ(1, scenes[1]->exitCount);
+    TEST_ASSERT_EQ(1, scenes[2]->exitCount);
+    TEST_ASSERT_EQ(1, scenes[3]->exitCount);
+    TEST_ASSERT_EQ(1, scenes[4]->exitCount);
+    TEST_ASSERT_EQ(0, scenes[5]->exitCount);
 }
 
 // ---------------------------------------------------------------------------

Tests/test_scene_graph.cpp

@@ -294,6 +294,10 @@ public:
     
     int value;
     
+    void onInit() override {
+        anchor = defaultAnchor();
+    }
+    
 protected:
     Vec2 defaultAnchor() const override { return Vec2(0.0f, 0.0f); }
 };