I have 10 points that represent the centres of countries. I want to show with arrows the flow (some kind of trade) from one country to another.
The way that my table of attributes is constructed is the following:
From country X Y To country X_to Y_to Value 1 X Y 2 X_to Y_to 10
I want the arrows to be proportional to the value and not to be straight lines but curved as it may be the case that 2 countries exchange trade, i.e. country 1 sends to country 2 and country 2 sends to country 1.