Fast draw wxPython OnPaint
Generally, the Python style is to indent by one tab, or four spaces. Functions and variables should be named in snake_case, and classes should be in PascalCase. See PEP8 for more style information.

You should also use docstrings to describe what your functions do. Here's an example of how docstrings are used.

def my_func( ... ):
    """
    Describe what your function does and
    it's arguments in this docstring.
    """
    ...


Other than that, your code looks pretty nice! Good work!