[connect c++] How to get/calculate text run's origin

Hi Experts,

I am using Connect C++ API to query TextBlock, Paragraph and Run's information. In order to make it easy to rendering in downstream application, I want get or calculate every run's origin, what's the recommended way to do this. About origin I only notice TextBlock has an origin and it's Justifaction related. Also I notice there is a TextString class can only accept TextElement and calculate it's origin (left bottom) and userOrigin, but none of them are related with run level. 

Thanks,

Danny