Cython first example

cy/ex1/HOWTO

+python setup.py build_ext --inplace
+
+python
+Python 2.7.3rc2 (default, Apr 22 2012, 22:30:17) 
+[GCC 4.6.3] on linux2
+Type "help", "copyright", "credits" or "license" for more information.
+>>> from rectangle import *
+>>> r = PyRectangle
+>>> r = PyRectangle(0,0,3,3)
+>>> r.getArea
+<built-in method getArea of rectangle.PyRectangle object at 0x7f1d32e33138>
+>>> r.getArea()
+9
+>>> 

cy/ex1/Rectangle.cpp

+#include "Rectangle.h"
+
+using namespace shapes;
+
+Rectangle::Rectangle(int X0, int Y0, int X1, int Y1)
+{
+x0 = X0;
+y0 = Y0;
+x1 = X1;
+y1 = Y1;
+}
+
+Rectangle::~Rectangle()
+{
+}
+
+int Rectangle::getLength()
+{
+return (x1 - x0);
+}
+
+int Rectangle::getHeight()
+{
+return (y1 - y0);
+}
+
+int Rectangle::getArea()
+{
+return (x1 - x0) * (y1 - y0);
+}
+
+void Rectangle::move(int dx, int dy)
+{
+x0 += dx;
+y0 += dy;
+x1 += dx;
+y1 += dy;
+}
+

cy/ex1/Rectangle.h

+namespace shapes {
+class Rectangle {
+public:
+int x0, y0, x1, y1;
+Rectangle(int x0, int y0, int x1, int y1);
+~Rectangle();
+int getLength();
+int getHeight();
+int getArea();
+void move(int dx, int dy);
+};
+}
+

cy/ex1/rectangle.pyx

+cdef extern from "Rectangle.h" namespace "shapes":
+    cdef cppclass Rectangle:
+        Rectangle(int, int, int, int)
+        int x0, y0, x1, y1
+        int getLength()
+        int getHeight()
+        int getArea()
+        void move(int, int)
+
+cdef class PyRectangle:
+    cdef Rectangle *thisptr # hold a C++ instance which we're wrapping
+    def __cinit__(self, int x0, int y0, int x1, int y1):
+        self.thisptr = new Rectangle(x0, y0, x1, y1)
+    def __dealloc__(self):
+        del self.thisptr
+    def getLength(self):
+        return self.thisptr.getLength()
+    def getHeight(self):
+        return self.thisptr.getHeight()
+    def getArea(self):
+        return self.thisptr.getArea()
+    def move(self, dx, dy):
+        self.thisptr.move(dx, dy)
+

cy/ex1/setup.py

+from distutils.core import setup
+from distutils.extension import Extension
+from Cython.Distutils import build_ext
+
+setup(ext_modules=[Extension("rectangle", ["rectangle.pyx", "Rectangle.cpp"], language="c++",)], cmdclass = {'build_ext': build_ext})