*去掉文件前缀je_

1 files changed, 54 insertions, 0 deletions

diff --git a/src/libjin/math/random.cpp b/src/libjin/math/random.cpp
new file mode 100644
index 0000000..5f3b28c
--- /dev/null
+++ b/src/libjin/math/random.cpp
@@ -0,0 +1,54 @@
+#include <math.h>
+#include "math.h"
+#include "random.h"
+
+namespace JinEngine
+{
+    namespace Math
+    {
+
+        RandomGenerator::RandomGenerator(uint32 seed)
+            : mSeed(seed)
+        {
+        }
+
+        uint32 RandomGenerator::rand()
+        {
+            unsigned int next = mSeed;
+            uint32 result;
+
+            next *= 1103515245;
+            next += 12345;
+            result = (unsigned int)(next / 65536) % 2048;
+
+            next *= 1103515245;
+            next += 12345;
+            result <<= 10;
+            result ^= (unsigned int)(next / 65536) % 1024;
+
+            next *= 1103515245;
+            next += 12345;
+            result <<= 10;
+            result ^= (unsigned int)(next / 65536) % 1024;
+
+            mSeed = next;
+
+            return result;
+        }
+
+        uint32 RandomGenerator::rand(uint32 min, uint32 max)
+        {
+            uint32 n = rand();
+            return n % (max - min + 1) + min;
+        }
+
+        float RandomGenerator::randf(float min, float max, int ac)
+        {
+            float floor = 0, ceil = max + reverse<float>(min);
+            uint32 a = pow(10.f, ac);
+            uint32 n = rand(floor*a, ceil*a);
+            return (float)n / a + min;
+        }
+
+    }
+}
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