diff --git a/core/base/Game.cpp b/core/base/Game.cpp
index 61ffc4fd..ecd2d715 100644
--- a/core/base/Game.cpp
+++ b/core/base/Game.cpp
@@ -136,7 +136,7 @@ namespace easy2d
 		::ShowWindow(window::instance.handle, SW_SHOWNORMAL);
 		::UpdateWindow(window::instance.handle);
 
-		const int min_interval = 5;
+		const int64_t min_interval = 5;
 		auto last = time::Now();
 		MSG msg = { 0 };
 
@@ -171,8 +171,8 @@ namespace easy2d
 				// ID2D1HwndRenderTarget 开启了垂直同步，在渲染时会等待显示器刷新，
 				// 它起到了非常稳定的延时作用，所以大部分时候不需要手动挂起线程进行延时。
 				// 下面的代码仅在一些情况下（例如窗口最小化时）挂起线程，防止占用过高 CPU 。
-				int wait = min_interval - dur.Milliseconds();
-				if (wait > 1)
+				int64_t wait = min_interval - dur.Milliseconds();
+				if (wait > 1LL)
 				{
 					std::this_thread::sleep_for(std::chrono::milliseconds(wait));
 				}
diff --git a/core/base/Node.cpp b/core/base/Node.cpp
index dcf203af..37948e9a 100644
--- a/core/base/Node.cpp
+++ b/core/base/Node.cpp
@@ -1041,9 +1041,9 @@ namespace easy2d
 		}
 	}
 
-	void Node::SetVisible(bool value)
+	void Node::SetVisible(bool val)
 	{
-		visible_ = value;
+		visible_ = val;
 	}
 
 	void Node::SetName(const String& name)
diff --git a/core/base/Node.h b/core/base/Node.h
index f39e76ab..cbdb2599 100644
--- a/core/base/Node.h
+++ b/core/base/Node.h
@@ -125,7 +125,7 @@ namespace easy2d
 
 		// 设置节点是否显示
 		void SetVisible(
-			bool value
+			bool val
 		);
 
 		// 设置节点名称
diff --git a/core/base/Size.cpp b/core/base/Size.cpp
index 80d63109..9f669a83 100644
--- a/core/base/Size.cpp
+++ b/core/base/Size.cpp
@@ -50,14 +50,14 @@ namespace easy2d
 		return Size(width - other.width, height - other.height);
 	}
 
-	Size Size::operator*(float value) const
+	Size Size::operator*(float val) const
 	{
-		return Size(width * value, height * value);
+		return Size(width * val, height * val);
 	}
 
-	Size Size::operator/(float value) const
+	Size Size::operator/(float val) const
 	{
-		return Size(width / value, height / value);
+		return Size(width / val, height / val);
 	}
 
 	Size Size::operator-() const
diff --git a/core/base/Size.h b/core/base/Size.h
index d2f758e8..6ff7025e 100644
--- a/core/base/Size.h
+++ b/core/base/Size.h
@@ -48,8 +48,8 @@ namespace easy2d
 
 		Size operator + (const Size & other) const;
 		Size operator - (const Size & other) const;
-		Size operator * (float value) const;
-		Size operator / (float value) const;
+		Size operator * (float val) const;
+		Size operator / (float val) const;
 		Size operator - () const;
 		bool operator== (const Size& other) const;
 	};
diff --git a/core/base/Text.cpp b/core/base/Text.cpp
index 67bb7ba8..cb15051f 100644
--- a/core/base/Text.cpp
+++ b/core/base/Text.cpp
@@ -223,9 +223,9 @@ namespace easy2d
 		style_.color = color;
 	}
 
-	void Text::SetItalic(bool value)
+	void Text::SetItalic(bool val)
 	{
-		font_.italic = value;
+		font_.italic = val;
 		Reset();
 	}
 
diff --git a/core/base/Text.h b/core/base/Text.h
index 8f865ceb..609a38fa 100644
--- a/core/base/Text.h
+++ b/core/base/Text.h
@@ -164,7 +164,7 @@ namespace easy2d
 
 		// 设置文字斜体（默认值为 false）
 		void SetItalic(
-			bool value
+			bool val
 		);
 
 		// 打开或关闭文本自动换行（默认为关闭）
diff --git a/core/base/macros.h b/core/base/macros.h
index 21d65e3e..c47269ea 100644
--- a/core/base/macros.h
+++ b/core/base/macros.h
@@ -20,6 +20,25 @@
 
 #pragma once
 
+#ifndef __cplusplus
+#	error Easy2D only supports C++ 
+#endif
+
+#ifndef _MSC_VER
+#   error Easy2D only supports MSVC compiler
+#endif
+
+#ifndef VS_VER
+#	define VS_VER _MSC_VER
+#	define VS_2013 1800
+#	define VS_2015 1900
+#	define VS_2017 1900
+#endif
+
+#if VS_VER < VS_2013
+#	error Easy2D only supports Visual Studio 2013 and above
+#endif
+
 #ifndef WINVER
 #	define WINVER 0x0700	   // Allow use of features specific to Windows 7 or later
 #endif
@@ -63,7 +82,7 @@
 #include <algorithm>
 
 
-#if _MSC_VER >= 1900  // >= Visual Studio 2015
+#if VS_VER >= VS_2015
 #	define E2D_NOEXCEPT noexcept
 #else
 #	define E2D_NOEXCEPT throw()
diff --git a/core/base/render.cpp b/core/base/render.cpp
index 2dbe1d46..55dbf181 100644
--- a/core/base/render.cpp
+++ b/core/base/render.cpp
@@ -32,7 +32,7 @@ namespace easy2d
 	{
 		_D2D_Resource D2D = { 0 };
 
-		void Initialize(HWND hwnd)
+		void easy2d::render::Initialize(HWND hwnd)
 		{
 			if (D2D.Factory)
 				return;
@@ -106,7 +106,7 @@ namespace easy2d
 			CreateDeviceResources(hwnd);
 		}
 
-		void CreateDeviceResources(HWND hwnd)
+		void easy2d::render::CreateDeviceResources(HWND hwnd)
 		{
 			if (!D2D.HwndRenderTarget)
 			{
@@ -155,7 +155,7 @@ namespace easy2d
 			}
 		}
 
-		void Uninitialize()
+		void easy2d::render::Uninitialize()
 		{
 			SafeRelease(D2D.TextRenderer);
 			SafeRelease(D2D.SolidColorBrush);
@@ -224,8 +224,9 @@ namespace easy2d
 		void GraphicsDevice::DrawDebugInfo()
 		{
 			static int render_times_ = 0;
-			static time::TimePoint last_render_time_ = time::Now();
-			int duration = (time::Now() - last_render_time_).Milliseconds();
+			static auto last_render_time_ = time::Now();
+
+			int64_t duration = (time::Now() - last_render_time_).Milliseconds();
 
 			if (!fps_text_format_)
 			{
@@ -250,10 +251,10 @@ namespace easy2d
 			}
 
 			++render_times_;
-			if (duration >= 100)
+			if (duration >= 100LL)
 			{
 				wchar_t fps_text[12] = {};
-				int len = swprintf_s(fps_text, L"FPS: %.1f", 1000.f / duration * render_times_);
+				int len = swprintf_s(fps_text, L"FPS: %.1f", 1000.f / static_cast<float>(duration) * render_times_);
 
 				last_render_time_ = time::Now();
 				render_times_ = 0;
diff --git a/core/base/time.cpp b/core/base/time.cpp
index f14ee5c0..832385cb 100644
--- a/core/base/time.cpp
+++ b/core/base/time.cpp
@@ -19,6 +19,7 @@
 // THE SOFTWARE.
 
 #include "time.h"
+#include <chrono>
 #include <regex>
 
 namespace easy2d
@@ -35,58 +36,61 @@ namespace easy2d
 		{
 		}
 
-		TimePoint::TimePoint(std::chrono::steady_clock::time_point time)
-			: time_(time)
+		TimePoint::TimePoint(const Duration& dur_since_epoch)
+			: dur_since_epoch_(dur_since_epoch)
+		{
+		}
+
+		TimePoint::TimePoint(int64_t dur_since_epoch)
+			: dur_since_epoch_(dur_since_epoch)
 		{
 		}
 
 		TimePoint::TimePoint(const TimePoint & other)
-			: time_(other.time_)
+			: dur_since_epoch_(other.dur_since_epoch_)
 		{
 		}
 
 		TimePoint::TimePoint(TimePoint && other)
-			: time_(std::move(other.time_))
+			: dur_since_epoch_(std::move(other.dur_since_epoch_))
 		{
 		}
 
 		time_t TimePoint::GetTimeStamp() const
 		{
-			auto& duration = time_point_cast<milliseconds>(time_).time_since_epoch();
-			return static_cast<time_t>(duration.count());
+			return static_cast<time_t>(dur_since_epoch_.Seconds());
 		}
 
 		bool TimePoint::IsZero() const
 		{
-			return time_.time_since_epoch().count() == 0LL;
+			return !!dur_since_epoch_.Milliseconds();
 		}
 
-		TimePoint TimePoint::operator+(const Duration & other) const
+		TimePoint TimePoint::operator+(const Duration & dur) const
 		{
-			return TimePoint(time_ + milliseconds(other.Milliseconds()));
+			return TimePoint(dur_since_epoch_ + dur);
 		}
 
-		TimePoint TimePoint::operator-(const Duration & other) const
+		TimePoint TimePoint::operator-(const Duration & dur) const
 		{
-			return TimePoint(time_ - milliseconds(other.Milliseconds()));
+			return TimePoint(dur_since_epoch_ - dur);
 		}
 
 		TimePoint & TimePoint::operator+=(const Duration & other)
 		{
-			time_ += milliseconds(other.Milliseconds());
+			dur_since_epoch_ += other;
 			return (*this);
 		}
 
 		TimePoint & TimePoint::operator-=(const Duration &other)
 		{
-			time_ -= milliseconds(other.Milliseconds());
+			dur_since_epoch_ -= other;
 			return (*this);
 		}
 
 		Duration TimePoint::operator-(const TimePoint & other) const
 		{
-			auto ms = duration_cast<milliseconds>(time_ - other.time_).count();
-			return Duration(static_cast<int>(ms));
+			return dur_since_epoch_ - other.dur_since_epoch_;
 		}
 
 		TimePoint& TimePoint::operator=(const TimePoint & other) E2D_NOEXCEPT
@@ -94,7 +98,7 @@ namespace easy2d
 			if (this == &other)
 				return *this;
 
-			time_ = other.time_;
+			dur_since_epoch_ = other.dur_since_epoch_;
 			return *this;
 		}
 
@@ -103,7 +107,7 @@ namespace easy2d
 			if (this == &other)
 				return *this;
 
-			time_ = std::move(other.time_);
+			dur_since_epoch_ = std::move(other.dur_since_epoch_);
 			return *this;
 		}
 
@@ -119,7 +123,7 @@ namespace easy2d
 
 		namespace
 		{
-			const auto duration_regex = std::wregex(L"[-+]?([0-9]*(\\.[0-9]*)?[a-z]+)+");
+			const auto duration_regex = std::wregex(LR"([-+]?([0-9]*(\.[0-9]*)?[a-z]+)+)");
 
 			typedef std::map<std::wstring, Duration> UnitMap;
 			const auto unit_map = UnitMap
@@ -136,12 +140,12 @@ namespace easy2d
 		{
 		}
 
-		Duration::Duration(int milliseconds)
+		Duration::Duration(int64_t milliseconds)
 			: milliseconds_(milliseconds)
 		{
 		}
 
-		int Duration::Milliseconds() const
+		int64_t Duration::Milliseconds() const
 		{
 			return milliseconds_;
 		}
@@ -167,6 +171,37 @@ namespace easy2d
 			return static_cast<float>(hour) + static_cast<float>(ms) / (60 * 60 * 1000.f);
 		}
 
+		std::wstring easy2d::time::Duration::ToString() const
+		{
+			std::wstring result;
+			int64_t ms = milliseconds_ % Second.milliseconds_;
+			int64_t sec = milliseconds_ / Second.milliseconds_;
+			int64_t min = milliseconds_ / Minute.milliseconds_;
+			int64_t hour = milliseconds_ / Hour.milliseconds_;
+
+			min -= hour * 60;
+			sec -= (hour * 60 * 60 + min * 60);
+
+			auto float_to_str = [](float val) -> std::wstring
+			{
+				wchar_t buf[10] = {};
+				::swprintf_s(buf, L"%.2f", val);
+				return std::wstring(buf);
+			};
+
+			if (milliseconds_ < 0)
+				result.append(L"-");
+
+			result.append(std::to_wstring(hour))
+				.append(L"h")
+				.append(std::to_wstring(min))
+				.append(L"m")
+				.append(float_to_str(static_cast<float>(sec) + static_cast<float>(ms) / 1000.f))
+				.append(L"s");
+
+			return result;
+		}
+
 		bool Duration::operator==(const Duration & other) const
 		{
 			return milliseconds_ == other.milliseconds_;
@@ -212,34 +247,54 @@ namespace easy2d
 			return Duration(-milliseconds_);
 		}
 
-		Duration Duration::operator*(int value) const
+		Duration Duration::operator*(int val) const
 		{
-			return Duration(milliseconds_ * value);
+			return Duration(milliseconds_ * val);
 		}
 
-		Duration Duration::operator/(int value) const
+		Duration Duration::operator/(int val) const
 		{
-			return Duration(milliseconds_ / value);
+			return Duration(milliseconds_ / val);
 		}
 
-		Duration Duration::operator*(float value) const
+		Duration easy2d::time::Duration::operator*(unsigned long long val) const
 		{
-			return Duration(static_cast<int>(milliseconds_ * value));
+			return Duration(static_cast<int64_t>(milliseconds_ * val));
 		}
 
-		Duration Duration::operator/(float value) const
+		Duration easy2d::time::Duration::operator/(unsigned long long val) const
 		{
-			return Duration(static_cast<int>(milliseconds_ / value));
+			return Duration(static_cast<int64_t>(milliseconds_ / val));
 		}
 
-		Duration Duration::operator*(double value) const
+		Duration Duration::operator*(float val) const
 		{
-			return Duration(static_cast<int>(milliseconds_ * value));
+			return Duration(static_cast<int64_t>(milliseconds_ * val));
 		}
 
-		Duration Duration::operator/(double value) const
+		Duration Duration::operator/(float val) const
 		{
-			return Duration(static_cast<int>(milliseconds_ / value));
+			return Duration(static_cast<int64_t>(milliseconds_ / val));
+		}
+
+		Duration Duration::operator*(double val) const
+		{
+			return Duration(static_cast<int64_t>(milliseconds_ * val));
+		}
+
+		Duration Duration::operator*(long double val) const
+		{
+			return Duration(static_cast<int64_t>(milliseconds_ * val));
+		}
+
+		Duration Duration::operator/(double val) const
+		{
+			return Duration(static_cast<int64_t>(milliseconds_ / val));
+		}
+
+		Duration Duration::operator/(long double val) const
+		{
+			return Duration(static_cast<int64_t>(milliseconds_ / val));
 		}
 
 		Duration & Duration::operator+=(const Duration &other)
@@ -254,70 +309,127 @@ namespace easy2d
 			return (*this);
 		}
 
-		Duration & Duration::operator*=(int value)
+		Duration & Duration::operator*=(int val)
 		{
-			milliseconds_ *= value;
+			milliseconds_ *= val;
 			return (*this);
 		}
 
-		Duration & Duration::operator/=(int value)
+		Duration & Duration::operator/=(int val)
 		{
-			milliseconds_ /= value;
+			milliseconds_ = static_cast<int64_t>(milliseconds_ / val);
 			return (*this);
 		}
 
-		Duration & Duration::operator*=(float value)
+		Duration & easy2d::time::Duration::operator*=(unsigned long long val)
 		{
-			milliseconds_ = static_cast<int>(milliseconds_ * value);
+			milliseconds_ = static_cast<int64_t>(milliseconds_ * val);
 			return (*this);
 		}
 
-		Duration & Duration::operator/=(float value)
+		Duration & easy2d::time::Duration::operator/=(unsigned long long val)
 		{
-			milliseconds_ = static_cast<int>(milliseconds_ / value);
+			milliseconds_ = static_cast<int64_t>(milliseconds_ * val);
 			return (*this);
 		}
 
-		Duration & Duration::operator*=(double value)
+		Duration & Duration::operator*=(float val)
 		{
-			milliseconds_ = static_cast<int>(milliseconds_ * value);
+			milliseconds_ = static_cast<int64_t>(milliseconds_ * val);
 			return (*this);
 		}
 
-		Duration & Duration::operator/=(double value)
+		Duration & Duration::operator/=(float val)
 		{
-			milliseconds_ = static_cast<int>(milliseconds_ / value);
+			milliseconds_ = static_cast<int64_t>(milliseconds_ / val);
 			return (*this);
 		}
 
-		Duration operator*(int value, const Duration & dur)
+		Duration & Duration::operator*=(double val)
 		{
-			return dur * value;
+			milliseconds_ = static_cast<int64_t>(milliseconds_ * val);
+			return (*this);
 		}
 
-		Duration operator/(int value, const Duration & dur)
+		Duration & Duration::operator*=(long double val)
 		{
-			return dur / value;
+			milliseconds_ = static_cast<int64_t>(milliseconds_ * val);
+			return (*this);
 		}
 
-		Duration operator*(float value, const Duration & dur)
+		Duration & Duration::operator/=(double val)
 		{
-			return dur * value;
+			milliseconds_ = static_cast<int64_t>(milliseconds_ / val);
+			return (*this);
 		}
 
-		Duration operator/(float value, const Duration & dur)
+		Duration & Duration::operator/=(long double val)
 		{
-			return dur / value;
+			milliseconds_ = static_cast<int64_t>(milliseconds_ / val);
+			return (*this);
 		}
 
-		Duration operator*(double value, const Duration & dur)
+		Duration easy2d::time::operator*(int val, const Duration & dur)
 		{
-			return dur * value;
+			return dur * val;
 		}
 
-		Duration operator/(double value, const Duration & dur)
+		Duration easy2d::time::operator*(unsigned long long val, const Duration & dur)
 		{
-			return dur / value;
+			return dur / val;
+		}
+
+		Duration easy2d::time::operator/(int val, const Duration & dur)
+		{
+			return dur / val;
+		}
+
+		Duration easy2d::time::operator/(unsigned long long val, const Duration & dur)
+		{
+			return dur * val;
+		}
+
+		Duration easy2d::time::operator*(float val, const Duration & dur)
+		{
+			return dur * val;
+		}
+
+		Duration easy2d::time::operator/(float val, const Duration & dur)
+		{
+			return dur / val;
+		}
+
+		Duration easy2d::time::operator*(double val, const Duration & dur)
+		{
+			return dur * val;
+		}
+
+		Duration easy2d::time::operator/(double val, const Duration & dur)
+		{
+			return dur / val;
+		}
+
+		Duration easy2d::time::operator*(long double val, const Duration & dur)
+		{
+			return dur * val;
+		}
+
+		Duration easy2d::time::operator/(long double val, const Duration & dur)
+		{
+			return dur / val;
+		}
+
+		std::wostream & easy2d::time::operator<<(std::wostream & out, const Duration & dur)
+		{
+			return out << dur.ToString();
+		}
+
+		std::wistream & easy2d::time::operator>>(std::wistream & in, Duration & dur)
+		{
+			std::wstring str;
+			in >> str;
+			dur = time::ParseDuration(str);
+			return in;
 		}
 
 
@@ -325,12 +437,16 @@ namespace easy2d
 		// Functions
 		//-------------------------------------------------------
 
-		TimePoint Now()
+		TimePoint easy2d::time::Now()
 		{
-			return TimePoint(steady_clock::now());
+			return TimePoint(
+				static_cast<int64_t>(
+					duration_cast<milliseconds>(steady_clock::now().time_since_epoch()).count()
+				)
+			);
 		}
 
-		Duration ParseDuration(const std::wstring & str)
+		Duration easy2d::time::ParseDuration(const std::wstring & str)
 		{
 			size_t len = str.length();
 			size_t pos = 0;
diff --git a/core/base/time.h b/core/base/time.h
index fe46906c..e1ecf646 100644
--- a/core/base/time.h
+++ b/core/base/time.h
@@ -20,7 +20,7 @@
 
 #pragma once
 #include "macros.h"
-#include <chrono>
+#include <cstdint>
 
 namespace easy2d
 {
@@ -34,18 +34,22 @@ namespace easy2d
 		//         1.5 小时: time::Hour * 1.5
 		//         3 小时 45 分 15 秒: time::Hour * 3 + time::Minute * 45 + time::Second * 15
 		//     时间段格式化: auto d = time::ParseDuration(L"1h35m");  // 1小时35分钟
-		// 
+		//     在 VS2015 及更高版本可以使用 time literals:
+		//         5 秒: 5_s
+		//         1.5 小时: 1.5_h
+		//         3 小时 45 分 15 秒: 3_h + 45_m + 15_s
+		//
 		class Duration
 		{
 		public:
 			Duration();
 
 			explicit Duration(
-				int milliseconds
+				int64_t milliseconds
 			);
 
 			// 转化为毫秒
-			int Milliseconds() const;
+			int64_t Milliseconds() const;
 
 			// 转化为秒
 			float Seconds() const;
@@ -56,6 +60,9 @@ namespace easy2d
 			// 转化为小时
 			float Hours() const;
 
+			// 转为字符串
+			std::wstring ToString() const;
+
 			bool operator== (const Duration &) const;
 			bool operator!= (const Duration &) const;
 			bool operator> (const Duration &) const;
@@ -67,30 +74,45 @@ namespace easy2d
 			Duration operator - (const Duration &) const;
 			Duration operator - () const;
 			Duration operator * (int) const;
+			Duration operator * (unsigned long long) const;
 			Duration operator * (float) const;
 			Duration operator * (double) const;
+			Duration operator * (long double) const;
 			Duration operator / (int) const;
+			Duration operator / (unsigned long long) const;
 			Duration operator / (float) const;
 			Duration operator / (double) const;
+			Duration operator / (long double) const;
 
 			Duration& operator += (const Duration &);
 			Duration& operator -= (const Duration &);
 			Duration& operator *= (int);
+			Duration& operator *= (unsigned long long);
 			Duration& operator *= (float);
 			Duration& operator *= (double);
+			Duration& operator *= (long double);
 			Duration& operator /= (int);
+			Duration& operator /= (unsigned long long);
 			Duration& operator /= (float);
 			Duration& operator /= (double);
+			Duration& operator /= (long double);
 
 			friend Duration operator* (int, const Duration &);
+			friend Duration operator* (unsigned long long, const Duration &);
 			friend Duration operator* (float, const Duration &);
 			friend Duration operator* (double, const Duration &);
+			friend Duration operator* (long double, const Duration &);
 			friend Duration operator/ (int, const Duration &);
+			friend Duration operator/ (unsigned long long, const Duration &);
 			friend Duration operator/ (float, const Duration &);
 			friend Duration operator/ (double, const Duration &);
+			friend Duration operator/ (long double, const Duration &);
+
+			friend std::wostream& operator<< (std::wostream &, const Duration &);
+			friend std::wistream& operator>> (std::wistream &, Duration &);
 
 		private:
-			int milliseconds_;
+			int64_t milliseconds_;
 		};
 
 		extern const Duration Millisecond;	// 毫秒
@@ -118,7 +140,11 @@ namespace easy2d
 			TimePoint();
 
 			explicit TimePoint(
-				std::chrono::steady_clock::time_point
+				const Duration& dur_since_epoch
+			);
+
+			explicit TimePoint(
+				int64_t dur_since_epoch
 			);
 
 			TimePoint(
@@ -147,7 +173,7 @@ namespace easy2d
 			TimePoint& operator = (TimePoint &&) E2D_NOEXCEPT;
 
 		private:
-			std::chrono::steady_clock::time_point time_;
+			Duration dur_since_epoch_;
 		};
 
 		// 获取当前时间
@@ -159,4 +185,59 @@ namespace easy2d
 		// 允许的时间单位有 "ms", "s", "m", "h"
 		Duration ParseDuration(const std::wstring& parse_str);
 	}
-}
\ No newline at end of file
+}
+
+#if VS_VER >= VS_2015
+
+namespace easy2d
+{
+	inline namespace literals
+	{
+		inline const easy2d::time::Duration operator "" _ms(long double val)
+		{
+			return easy2d::time::Millisecond * val;
+		}
+
+		inline const easy2d::time::Duration operator "" _s(long double val)
+		{
+			return easy2d::time::Second * val;
+		}
+
+		inline const easy2d::time::Duration operator "" _m(long double val)
+		{
+			return easy2d::time::Minute * val;
+		}
+
+		inline const easy2d::time::Duration operator "" _h(long double val)
+		{
+			return easy2d::time::Hour * val;
+		}
+
+		inline const easy2d::time::Duration operator "" _ms(unsigned long long val)
+		{
+			return easy2d::time::Millisecond * val;
+		}
+
+		inline const easy2d::time::Duration operator "" _s(unsigned long long val)
+		{
+			return easy2d::time::Second * val;
+		}
+
+		inline const easy2d::time::Duration operator "" _m(unsigned long long val)
+		{
+			return easy2d::time::Minute * val;
+		}
+
+		inline const easy2d::time::Duration operator "" _h(unsigned long long val)
+		{
+			return easy2d::time::Hour * val;
+		}
+	}
+
+	namespace time
+	{
+		using namespace easy2d::literals;
+	}
+}
+
+#endif
diff --git a/core/easy2d.h b/core/easy2d.h
index d650e585..d89ebbcb 100644
--- a/core/easy2d.h
+++ b/core/easy2d.h
@@ -25,16 +25,6 @@
 
 #pragma once
 
-#ifndef __cplusplus
-#	error 仅能在 C++ 环境下使用 Easy2D
-#endif
-
-#ifndef _MSC_VER
-#   error 仅支持在 MSVC 环境下编译
-#elif _MSC_VER < 1800
-#	error Easy2D 不支持 Visual Studio 2013 以下版本
-#endif
-
 
 //
 // base
diff --git a/core/math/scalar.hpp b/core/math/scalar.hpp
index 423240aa..d0e4951f 100644
--- a/core/math/scalar.hpp
+++ b/core/math/scalar.hpp
@@ -25,40 +25,40 @@ namespace easy2d
 {
 	namespace math
 	{
-		inline int Abs(int v) { return ::abs(v); }
+		inline int Abs(int val) { return ::abs(val); }
 
-		inline float Abs(float v) { return ::fabsf(v); }
+		inline float Abs(float val) { return ::fabsf(val); }
 
-		inline double Abs(double v) { return ::fabs(v); }
+		inline double Abs(double val) { return ::fabs(val); }
 
-		inline float Sqrt(float v) { return ::sqrtf(v); }
+		inline float Sqrt(float val) { return ::sqrtf(val); }
 
-		inline double Sqrt(double v) { return ::sqrt(v); }
+		inline double Sqrt(double val) { return ::sqrt(val); }
 
-		inline int Sign(int v) { return v < 0 ? -1 : 1; }
+		inline int Sign(int val) { return val < 0 ? -1 : 1; }
 
-		inline float Sign(float v) { return v < 0 ? -1.f : 1.f; }
+		inline float Sign(float val) { return val < 0 ? -1.f : 1.f; }
 
-		inline double Sign(double v) { return v < 0 ? -1.0 : 1.0; }
+		inline double Sign(double val) { return val < 0 ? -1.0 : 1.0; }
 
-		inline float Sin(float v) { return ::sinf(v); }
+		inline float Sin(float val) { return ::sinf(val); }
 
-		inline double Sin(double v) { return ::sin(v); }
+		inline double Sin(double val) { return ::sin(val); }
 
-		inline float Cos(float v) { return ::cosf(v); }
+		inline float Cos(float val) { return ::cosf(val); }
 
-		inline double Cos(double v) { return ::cos(v); }
+		inline double Cos(double val) { return ::cos(val); }
 
-		inline float Tan(float v) { return ::tanf(v); }
+		inline float Tan(float val) { return ::tanf(val); }
 
-		inline double Tan(double v) { return ::tan(v); }
+		inline double Tan(double val) { return ::tan(val); }
 
-		inline float Ceil(float v) { return ceil(v); }
+		inline float Ceil(float val) { return ceil(val); }
 
-		inline double Ceil(double v) { return ceil(v); }
+		inline double Ceil(double val) { return ceil(val); }
 
-		inline float Floor(float v) { return floor(v); }
+		inline float Floor(float val) { return floor(val); }
 
-		inline double Floor(double v) { return floor(v); }
+		inline double Floor(double val) { return floor(val); }
 	}
 }
diff --git a/core/math/vector.hpp b/core/math/vector.hpp
index 0d1f1c40..abbe020c 100644
--- a/core/math/vector.hpp
+++ b/core/math/vector.hpp
@@ -59,14 +59,14 @@ namespace easy2d
 				return Vector2(x - other.x, y - other.y);
 			}
 
-			inline Vector2 operator * (float value) const
+			inline Vector2 operator * (float val) const
 			{
-				return Vector2(x * value, y * value);
+				return Vector2(x * val, y * val);
 			}
 
-			inline Vector2 operator / (float value) const
+			inline Vector2 operator / (float val) const
 			{
-				return Vector2(x / value, y / value);
+				return Vector2(x / val, y / val);
 			}
 
 			inline Vector2 operator - () const
diff --git a/core/utils/Data.cpp b/core/utils/Data.cpp
index 1ebe8b9a..1f029309 100644
--- a/core/utils/Data.cpp
+++ b/core/utils/Data.cpp
@@ -44,56 +44,56 @@ namespace easy2d
 		return temp[0] == L'\0';
 	}
 
-	bool Data::SaveInt(int value)
+	bool Data::SaveInt(int val)
 	{
 		BOOL ret = ::WritePrivateProfileStringW(
 			field_.c_str(),
 			key_.c_str(),
-			std::to_wstring(value).c_str(),
+			std::to_wstring(val).c_str(),
 			data_path_.c_str()
 		);
 		return ret == TRUE;
 	}
 
-	bool Data::SaveFloat(float value)
+	bool Data::SaveFloat(float val)
 	{
 		BOOL ret = ::WritePrivateProfileStringW(
 			field_.c_str(),
 			key_.c_str(),
-			std::to_wstring(value).c_str(),
+			std::to_wstring(val).c_str(),
 			data_path_.c_str()
 		);
 		return ret == TRUE;
 	}
 
-	bool Data::SaveDouble(double value)
+	bool Data::SaveDouble(double val)
 	{
 		BOOL ret = ::WritePrivateProfileStringW(
 			field_.c_str(),
 			key_.c_str(),
-			std::to_wstring(value).c_str(),
+			std::to_wstring(val).c_str(),
 			data_path_.c_str()
 		);
 		return ret == TRUE;
 	}
 
-	bool Data::SaveBool(bool value)
+	bool Data::SaveBool(bool val)
 	{
 		BOOL ret = ::WritePrivateProfileStringW(
 			field_.c_str(),
 			key_.c_str(),
-			(value ? L"1" : L"0"),
+			(val ? L"1" : L"0"),
 			data_path_.c_str()
 		);
 		return ret == TRUE;
 	}
 
-	bool Data::SaveString(const String& value)
+	bool Data::SaveString(const String& val)
 	{
 		BOOL ret = ::WritePrivateProfileStringW(
 			field_.c_str(),
 			key_.c_str(),
-			value.c_str(),
+			val.c_str(),
 			data_path_.c_str()
 		);
 		return ret == TRUE;
diff --git a/core/utils/Data.h b/core/utils/Data.h
index 1efd9717..8bf6a153 100644
--- a/core/utils/Data.h
+++ b/core/utils/Data.h
@@ -37,27 +37,27 @@ namespace easy2d
 
 		// 保存 int 类型的值
 		bool SaveInt(
-			int value
+			int val
 		);
 
 		// 保存 float 类型的值
 		bool SaveFloat(
-			float value
+			float val
 		);
 
 		// 保存 double 类型的值
 		bool SaveDouble(
-			double value
+			double val
 		);
 
 		// 保存 bool 类型的值
 		bool SaveBool(
-			bool value
+			bool val
 		);
 
 		// 保存 String 类型的值
 		bool SaveString(
-			const String& value
+			const String& val
 		);
 
 		// 获取 int 类型的值