Simple Steps:
a) Initialization
--Assign No of Nodes and their position
-- Estimate the Distance using sqrt((x1-x2)^2 +(y1-y2)^2)
b) Initialize PSO parameters
-- Assign Maximum Iteration
-- Assign Initial Population/particles
c) Fitness Function
-- Distance as cost/ We want to minimize the Distance

d) Result
-- Routing path Displayed with Arrow
-- starting node show as green color