The Path Coordinate System
The final coordinate system is the path coordinate system which also has both an x and y component and starts with a value of (0,0) in the upper left corner of the shape. Now it must be known that this coordinate system is a unique one in that its units are relative to the specified width and height of the coordinate space. The path coordinate system has exactly the same EMU dimensions as the shape coordinate system but different units. While the shape coordinate system uses EMUs, the path coordinate system uses (1/width) as the x units and (1/height) as the y units. That is if the path was specified to have a width of 2 and a height of 1, then the path coordinate (1,1) would be equivalent to (600000,1000000) in the shape coordinate system. The path coordinate system will be better understood later, once the path element is described.
Note that all dimensions and coordinates must be specified using whole numbers.