From ef20385e0da90072cace19decb7ee5c00d045a82 Mon Sep 17 00:00:00 2001
From: Nomango <569629550@qq.com>
Date: Sun, 8 Oct 2017 16:46:44 +0800
Subject: [PATCH] =?UTF-8?q?=E6=96=B0=E5=A2=9E=E4=BA=86Math=E7=B1=BB?=
 =?UTF-8?q?=EF=BC=8C=E5=8F=AF=E4=BB=A5=E8=8E=B7=E5=8F=96=E4=BB=BB=E6=84=8F?=
 =?UTF-8?q?=E8=8C=83=E5=9B=B4=E5=86=85=E7=9A=84=E9=9A=8F=E6=9C=BA=E6=95=B0?=
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Content-Type: text/plain; charset=UTF-8
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---
 Easy2D/Easy2D.vcxproj         |  1 +
 Easy2D/Easy2D.vcxproj.filters |  3 +++
 Easy2D/Tool/Math.cpp          |  9 +++++++++
 Easy2D/easy2d.h               | 28 ++++++++++++++++++++++++++++
 4 files changed, 41 insertions(+)
 create mode 100644 Easy2D/Tool/Math.cpp

diff --git a/Easy2D/Easy2D.vcxproj b/Easy2D/Easy2D.vcxproj
index 3331284e..804ed744 100644
--- a/Easy2D/Easy2D.vcxproj
+++ b/Easy2D/Easy2D.vcxproj
@@ -388,6 +388,7 @@
     <ClCompile Include="Style\LineStyle.cpp" />
     <ClCompile Include="Tool\ActionManager.cpp" />
     <ClCompile Include="Tool\FileUtils.cpp" />
+    <ClCompile Include="Tool\Math.cpp" />
     <ClCompile Include="Tool\MusicUtils.cpp" />
     <ClCompile Include="Tool\Timer.cpp" />
   </ItemGroup>
diff --git a/Easy2D/Easy2D.vcxproj.filters b/Easy2D/Easy2D.vcxproj.filters
index 5bee1125..93d61bbf 100644
--- a/Easy2D/Easy2D.vcxproj.filters
+++ b/Easy2D/Easy2D.vcxproj.filters
@@ -168,6 +168,9 @@
     <ClCompile Include="Object\RectNode.cpp">
       <Filter>源文件\Object</Filter>
     </ClCompile>
+    <ClCompile Include="Tool\Math.cpp">
+      <Filter>源文件\Tool</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="easy2d.h">
diff --git a/Easy2D/Tool/Math.cpp b/Easy2D/Tool/Math.cpp
new file mode 100644
index 00000000..2d0a3821
--- /dev/null
+++ b/Easy2D/Tool/Math.cpp
@@ -0,0 +1,9 @@
+#include "..\easy2d.h"
+
+
+std::default_random_engine &Math::getEngine()
+{
+	static std::random_device device;
+	static std::default_random_engine engine(device());
+	return engine;
+}
diff --git a/Easy2D/easy2d.h b/Easy2D/easy2d.h
index 7be7615d..252c0a43 100644
--- a/Easy2D/easy2d.h
+++ b/Easy2D/easy2d.h
@@ -24,6 +24,7 @@
 #include <vector>
 #include <stack>
 #include <functional>
+#include <random>
 
 
 #if defined(UNICODE) && (_DEBUG)
@@ -1564,6 +1565,27 @@ private:
 	static void addAction(Action * action);
 };
 
+class Math
+{
+public:
+	// ȡ�����ͷ�Χ�ڵ�һ�������
+	template<typename T>
+	static T randomInt(T min, T max)
+	{
+		std::uniform_int_distribution<T> dist(min, max);
+		return dist(getEngine());
+	}
+	// ȡ�ø��������ͷ�Χ�ڵ�һ�������
+	template<typename T>
+	static T randomReal(T min, T max)
+	{
+		std::uniform_real_distribution<T> dist(min, max);
+		return dist(getEngine());
+	}
+	// ��ȡ�����������
+	static std::default_random_engine &getEngine();
+};
+
 }	// End of easy2d namespace
 
 
@@ -1572,4 +1594,10 @@ private:
 inline void SafeRelease(easy2d::Object * p) { if (p) p->release(); }
 inline void SafeDelete(void * p) { if (p) delete p; }
 
+template<typename T>
+inline T random(T min, T max) { return easy2d::Math::randomInt(min, max); }
+inline float random(float min, float max) { return easy2d::Math::randomReal(min, max); }
+inline double random(double min, double max) { return easy2d::Math::randomReal(min, max); }
+inline long double random(long double min, long double max) { return easy2d::Math::randomReal(min, max); }
+
 using namespace easy2d;
\ No newline at end of file