I have a map of a region and I am plotting pie-charts (as diagrams) over every country in that region in QGIS (1.9.0). I also need to connect those pie-charts with lines (which I am creating in the Mapping Toolbox of MATLAB as a separate shapefile).
Can you please tell me if there is a way of knowing in advance what coordinates of a country QGIS shows its pie-chart at? Also, can I capture those coordinates automatically (even before the pie-charts are drawn) just as I would normally do using the Coordinate Capture plugin? That way, I can create the lines from one point to another before even plotting the pie-charts.