EndingCondition.cs

This example shows how to use the Pathfinding::XPath's EndingCondition variable.In this example a custom ending condition class is created which tells the path to stop when a node is close enough to the target point. This script should be attached to a GameObject with a Seeker component.

Version

Tested in the A* Pathfinding Project 3.0.7

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using Pathfinding;

public class EndingCondition : MonoBehaviour {
#if FALSE
    public int hLimit = 100;        /* The H score a close node should have an H score less than. H score is usually roughly the distance*100 */
    public Transform targetPoint;   /* The target to find a path to (or close to) */

    // Use this for initialization
    void Start () {
        Seeker seeker = GetComponent<Seeker>();

        seeker.pathCallback = OnPathComplete;

        //Create a new XPath with a custom ending condition
        XPath p = new XPath(transform.position, targetPoint.position, null);
        p.endingCondition = new CEC(p, hLimit);

        //Draw a line in black from the start to the target point
        Debug.DrawLine(transform.position, targetPoint.position, Color.black);

        seeker.StartPath(p);
    }

    /* Custom Ending Condition */
    public class CEC : ABPathEndingCondition {
        public int hLimit = 80;

        public CEC (ABPath p, int lim) : base(p) {
            hLimit = lim;
        }

        /* The path should complete when the current node has an H value less than hLimit */
        public override bool TargetFound (PathNode node) {
            return node.H < hLimit || node.node == abPath.endNode;
        }
    }

    public void OnPathComplete (Path p) {
        Debug.Log("Got Callback");

        if (p.error) {
            Debug.Log("Ouch, the path returned an error");
            return;
        }

        List<Vector3> path = p.vectorPath;

        for (int j = 0; j < path.Count-1; j++) {
            //Plot segment j to j+1 with a nice color got from Pathfinding.AstarMath.IntToColor
            Debug.DrawLine(path[j], path[j+1], Mathfx.IntToColor(1, 0.5F));
        }
    }
#endif
}