obj_astar_create

randomize(); //get random node positions for the sake of this example

//add 100 nodes to the room
for (var i=0; i<100;++i)
{
    instance_create(random(room_width),random(room_height),obj_node);
}

//get a random start and end node from all the nodes
startNode = instance_id[irandom(instance_number(obj_node)-1)];
endNode = instance_id[irandom(instance_number(obj_node)-1)];

//start node is green, end node is red
with (startNode)
{
    image_blend = c_green;
}

with (endNode)
{
    image_blend = c_red;
}

//we will store all nodes from the path here
//including the start and end nodes
pathNodes = ds_list_create();
maxRange = 128; //how far apart can the nodes be before they are too far away from each other
found = false; //just a boolean if there is a current path found