Steve with his moving legs.

GameObject.ixx

@@ -43,7 +43,7 @@ public:
     virtual void OnUpdate(float delta) = 0;
     virtual void OnLaterUpdate(float delta) = 0;
 
-    void OnRender()
+    virtual void OnRender()
     {
         Rect dst =
         { 

Math.ixx

@@ -11,6 +11,9 @@ export
     };
     struct Rect : D2D1_RECT_F
     {
-
+        Vector2 size() const&
+        {
+            return { right - left, bottom - top };
+        }
     };
 }

Steve.ixx

@@ -8,17 +8,30 @@ import Input;
 
 export struct Steve : GameObject
 {
+    static constexpr const float ground_height = 50;
+    static constexpr const float y_pos = 100;
     float a, v, h;
     bool jumping = false;
+    float time = 0.0f;
+
+    Rect IdleRect = { 76, 2, 164, 96 };
+    Rect NormalRect = { 1678, 2, 1766, 96 };
+    Rect CloseEyeRect = { 1766, 2, 1854, 96 };
+    Rect RightRect = { 1854, 2, 1942, 96 };
+    Rect LeftRect = { 1942, 2, 2030, 96 };
+    Rect BigEyeRect = { 2030, 2, 2118, 96 };
+    Rect DeadRect = { 2122, 2, 2202, 96 };
+    Rect CrawlingRightRect = { 2203, 2, 2321, 96 };
+    Rect CrawlingLeftRect = { 2321, 2, 2439, 96 };
 
     enum Status { Idle, Running, Jumping, Freefall, Crawling, Dead } status;
 
     virtual void OnStartUp() override
     {
         imge = Texture::LoadFromFile(L"steve.png");
-        imge.rect = { 1678, 2, 1766, 96 };
+        imge.rect = IdleRect;
 
-        Posi = { 94, 100 };
+        Posi = { y_pos, ground_height };
         Anch = { 0.5f,0 };
         Size = { 88, 94 };
 
@@ -30,25 +43,28 @@ export struct Steve : GameObject
     }
     virtual void OnUpdate(float delta) override
     {
+        time += delta;
         switch (status)
         {
         case Steve::Idle:
             if (KeyBoard::GetKey(VK_SPACE)) status = Running;
+            imge.rect = IdleRect;
             break;
         case Steve::Running:
             if (KeyBoard::GetKey(VK_SPACE))
             {
                 status = Jumping;
-                goto _jump_;
+                break;
             }
+            imge.rect = (int)(time / 0.1) % 2 ? LeftRect : RightRect;
             break;
         case Steve::Jumping:
-        _jump_:
+            imge.rect = NormalRect;
-            if ((h < 60 || KeyBoard::GetKey(VK_SPACE)) && h < 120.f)
+            if ((h < 75 || KeyBoard::GetKey(VK_SPACE)) && h < 150.f)
             {
                 v = 1000.f;
                 h += v * delta;
-                Posi.y = 100 + h;
+                Posi.y = ground_height + h;
             }
             else
             {
@@ -58,13 +74,13 @@ export struct Steve : GameObject
         case Steve::Freefall:
             a = -8000.f;
             v += a * delta;
-            if (v < -1000) v = -1200;
+            if (v < -1200) v = -1200;
             h += v * delta;
-            Posi.y = 100 + h;
+            Posi.y = ground_height + h;
-            if (Posi.y <= 100)
+            if (Posi.y <= ground_height)
             {
                 status = Running;
-                Posi.y = 100;
+                Posi.y = ground_height;
             }
             break;
         case Steve::Crawling: