Python SVG generator

This is a simple python package for generating svg documents.

It's evolved though use in four projects over the last ten years; most recently I used it in breadboarder which now depends on it as an external package.

I have separated it out as I now have other current projects which use it.

`svg is organized into several modules, each responsible for a specific part of the SVG creation process.

1. svg.py: This module defines several classes that represent different SVG elements, such as Rectangle, Line, Text, Circle, Image, and Dimple. Each of these classes inherits from either SimpleItem or CompositeItem, which in turn inherit from Drawable. Drawable is an abstract base class that requires its subclasses to implement an element method. This method is responsible for creating an XML element that represents the SVG element. The CompositeItem class is used for SVG elements that can contain other elements, like GroupedDrawable.

2. path.py: This module defines the Path class and several PathSegment subclasses. A Path is an SVG element that consists of one or more segments, which can be lines, arcs, etc. Each PathSegment subclass implements a specification method that returns a string representing the SVG path command for that segment.

3. point.py: This module defines the Point class, which represents a point in a 2D space. It provides methods for performing basic vector operations like addition, subtraction, and scaling.

4. transform.py: This module defines several classes that represent SVG transformations, like Translation and Rotation. These classes inherit from the Transform abstract base class, which requires its subclasses to implement text, as_matrix, and transform methods. The text method returns a string representing the SVG transform command, and the transform method applies the transformation to a Point.

The code also includes a write function in svg.py that writes a string to a file. This could be used to write the SVG XML to a file.

Overall, this code provides a way to create complex SVG graphics using Python code. The user can create instances of the various SVG element classes, set their properties, and then call their element methods to generate the SVG XML.