Move unit from point A to point B to point C

Unity Engine
1

Hi,

I am making a tile-based game. I ready find a path between two tiles, and store that into an array. But I have trouble moving an object based on path. Here is my code, which doesn’t seem to work.

Basically, I loop through pathlist array to obtain positions. A while loop is used to move from point A to point B. The “gamestate” and “ismoving” variables are used to prevent a section of code from executing.

//main loop
function Update() {
	if (gamestate==1)
	{
		//examine unit list, select current unit
		Somefunction();
	}
	
	if (gamestate==2)
	{
		//check if current unit belongs to player or AI. wait for user input. find path, store path in pathlist array.
		Someotherfunction();
	}
	if (gamestate==3)
	{
		//move unit
                if (ismoving == false)  //global variable, already declared.
	        {
		ismoving = true;
		for (var i:int = pathlist.length-2;i>=0;i--)  //pathlist is an array, which stores the result from A*. pathlist[0] is the ending tile, pathlist[pathlist.length-1] is the starting tile
		{
			var lerpt:float = 0;  //for Vector3.Lerp() function
			var startlocation:Vector3 = Vector3(pathlist[i+1].xvalue,0,pathlist[i+1].yvalue);
			var endlocation:Vector3 = Vector3(pathlist[i].xvalue,0,pathlist[i].yvalue);
			var locator:Vector3 = Vector3(pathlist[i+1].xvalue,0,pathlist[i+1].yvalue);

			while (lerpt != 1)
			{
				lerpt += 1*Time.deltaTime;
				if (lerpt >= 1)
				{
					lerpt = 1;
				}

				locator = Vector3.Lerp(startlocation,endlocation,lerpt);

				unit.transform.position.x = locator.x; //the object to be moved
				unit.transform.position.y = locator.y;
				unit.transform.position.z = locator.z;
			}
		}
		ismoving = false;
                gamestate = 4;
	        }
                
	}
}
2

I think your looking at your problem as if the code kept running. Or at least that is what I think. Also, I think you are looking at it as one controller. The best way to do this is to have each unit think for it’s self.

In your code you are using a while statement that says, keep moving my character until he has reached his point. In unity things are a bit more fluid.

Update runs once each frame. So in your pathing you should update him between his last point and his next point. When he reaches his next point, that point becomes his last point and then he chooses another point to go to. Using this method, your movement can be a bit more fluid.

A few suggestions:

Use an enum state instead of numbers. it will help with understanding.
Those states should call funcitons based on their state so attacking would call a funciton called attacking();
All of your movement should be base in time vs tile. So your position looks like this:

	transform.position=Vector3.Lerp(lastTile,nextTile,(lastMoveStart + moveSpeed) - Time.time);
	transform.LookAt(nextTile);
	transform.localEulerAngles.x=0.0; // z is always zero in the LookAt()

Of course, once you reach a tile center, you want to reset lastMoveStart.
Tiles should have movement modifiers and possibly attack modifiers. if you are shooting into a tile that is dense they should have less of a chance to hit. If you are moving into a rough tile, movement is slower (increase moveSpeed)