Ajout du GUI

kivy/graphics/common.pxi

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+#
+# Common definition
+#
+
+DEF PI2 = 1.5707963267948966
+DEF PI = 3.1415926535897931
+
+cdef extern from *:
+    ctypedef char* const_char_ptr "const char*"
+
+cdef double pi = PI
+cdef extern from "math.h":
+    double cos(double) nogil
+    double acos(double) nogil
+    double sin(double) nogil
+    double sqrt(double) nogil
+    double pow(double x, double y) nogil
+    double atan2(double y, double x) nogil
+    double tan(double) nogil
+    double fabs(double) nogil
+
+cdef extern from "stdlib.h":
+    ctypedef unsigned long size_t
+    void free(void *ptr) nogil
+    void *realloc(void *ptr, size_t size) nogil
+    void *malloc(size_t size) nogil
+    void *calloc(size_t nmemb, size_t size) nogil
+
+cdef extern from "string.h":
+    void *memcpy(void *dest, void *src, size_t n) nogil
+    void *memset(void *dest, int c, size_t len)
+