How are mouse movement statistics calcalutated?

Hi,

I'm writing a script to generate diagrams from the statistics that 
Workrave keeps. How are the mouse movement statistics calculated?

For instance, yesterday I had TOTAL_MOUSE_MOVEMENT: 1346876 (pixels) and 
TOTAL_CLICK_MOVEMENT: 681931 (pixels).

The statistics window shows Mouse movement: 355.66m and Effective mouse 
movement: 180.07m.

My screen resolution is 1280 x 800. 

I found this snippet in the source code (not really sure if this is 
actually applies):

double mm = (double) pixels * gdk_screen_width_mm() / gdk_screen_widt();
sprintf(buf, "%.02f m", mm/1000);

But still I don't know how to get from 1346876 pixels to 355.66 meters.

Thorsten


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