this is my capx example for a mini map system using the platform example.
if some one need help tell me I Will help you.
only you need to do is, create a image with a perfect scale of the complete layout or map,
create a sprite in my case indicator with the same scale of the map.
using this event to create the following system.
system every tick-- indicator X to minimap.X+(Player.X/10)
indicator Y to minimap.Y+(Player.Y/10)
this is the minimap image that i use