新增了Math类，可以获取任意范围内的随机数

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>

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">

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;
+}

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:
+	// 取得整型范围内的一个随机数
+	template<typename T>
+	static T randomInt(T min, T max)
+	{
+		std::uniform_int_distribution<T> dist(min, max);
+		return dist(getEngine());
+	}
+	// 取得浮点数类型范围内的一个随机数
+	template<typename T>
+	static T randomReal(T min, T max)
+	{
+		std::uniform_real_distribution<T> dist(min, max);
+		return dist(getEngine());
+	}
+	// 获取随机数产生器
+	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;