diff --git a/src/Apps/Demo/main.cpp b/src/Apps/Demo/main.cpp
index 0c781ab..818fb0b 100644
--- a/src/Apps/Demo/main.cpp
+++ b/src/Apps/Demo/main.cpp
@@ -1,15 +1,13 @@
-#include <algorithm>
+#include <array>
 #include <chrono>
 #include <cstdint>
+#include <cstdio>
 #include <cstdlib>
 #include <cstring>
-#include <cstdio>
 #include <iostream>
 #include <thread>
-#include <chrono>
+
 #include "Color.h"
-#include <cstdlib>
-#include "Timer.h"
 #include "DrawContext.h"
 #include "Image.h"
 #include "TimeSource.h"
@@ -23,15 +21,10 @@
 #include "SDLDisplay.h"
 #endif
 
-const int32_t width = 1024;
-const int32_t height = 600;
-
-static void PrintUsage(const char *program_name)
+namespace
 {
-	std::cout
-		<< "Usage: " << program_name << " [--fps 30|45|60]\n"
-		<< "       " << program_name << " [--fps=30|45|60]\n";
-}
+	const int32_t DemoWidth = 1024;
+	const int32_t DemoHeight = 600;
 
 	struct ProgramOptions
 	{
@@ -45,6 +38,13 @@ static void PrintUsage(const char *program_name)
 		}
 	};
 
+	static void PrintUsage(const char* program_name)
+	{
+		std::cout
+			<< "Usage: " << program_name << " [--fps 30|45|60]\n"
+			<< "       " << program_name << " [--fps=30|45|60]\n";
+	}
+
 	static Platform::IDisplay* CreateDisplay()
 	{
 #ifdef USE_FRAMEBUFFER
@@ -54,13 +54,6 @@ static void PrintUsage(const char *program_name)
 #endif
 	}
 
-	static void PrintUsage(const char* program_name)
-	{
-		std::cout
-			<< "Usage: " << program_name << " [--fps 30|45|60]\n"
-			<< "       " << program_name << " [--fps=30|45|60]\n";
-	}
-
 	static ProgramOptions ParseProgramOptions(int argc, char* argv[])
 	{
 		ProgramOptions options;
diff --git a/src/Apps/Game/Main.cpp b/src/Apps/Game/Main.cpp
index 9bb2ff9..511c7f2 100644
--- a/src/Apps/Game/Main.cpp
+++ b/src/Apps/Game/Main.cpp
@@ -205,6 +205,8 @@ namespace
 
 int main(int argc, char* argv[])
 {
+	std::cout << "[INFO] Start make tom game." << std::endl;
+
 	const ProgramOptions options = ParseProgramOptions(argc, argv);
 	if (options.show_help)
 	{
@@ -257,7 +259,7 @@ int main(int argc, char* argv[])
 	Core::Timer timer(options.target_fps);
 	Platform::SteadyTimeSource time_source;
 
-	std::cout << "Tom game started. Target FPS: " << timer.target_fps() << std::endl;
+	std::cout << "[INFO] Tom game started. Target FPS: " << timer.target_fps() << std::endl;
 
 	bool is_running = true;
 	uint32_t animation_time_ms = 0;
diff --git a/src/Core/Math/Vector2.h b/src/Core/Math/Vector2.h
index 69c4b56..ff43622 100644
--- a/src/Core/Math/Vector2.h
+++ b/src/Core/Math/Vector2.h
@@ -35,7 +35,11 @@ namespace Math
 
 		Vector2() : x(0), y(0) {}
 		Vector2(float x, float y) : x(x), y(y) {}
-		Vector2(const Vector2Int& other) :x(other.x), y(other.y) {}
+		Vector2(const Vector2Int& other)
+			: x(static_cast<float>(other.x)),
+			  y(static_cast<float>(other.y))
+		{
+		}
 
 		/// <summary>
 		/// 交换当前 Vector2 对象与另一个 Vector2 对象的 x 和 y 的值