Question

in my app, a canvas moves when i move my handRigth (kinect SDK), I need to create a method (C#, Wpf)that allows me to store the coordinates of Y (arrayList of 100 positions). this method content:

alLastCoor_HandRight.Add(dYpuntero); //ArrayList, dYpuntero=Position
if (alLastCoor_HandRight.Count > 100)// Limit ArrayList 100 positions
alLastCoor_HandRight.RemoveAt(0);

and each time enter the method, store 100 positions of Y canvas position.
How can i do that ??

Answer 1

First of all, never use ArrayLists as they do the same thing as Lists only less efficiently (see ArrayList vs List<object>). The way I would do this is by having a Boolean to decide if the count was greater than 100 or less than 100 like this:

    private bool HasLessThan100(List<double> list)
    {
        if (list.Count <= 100) return true;

        if (list.Count > 100) return false;

        return false;
    }

Then for your method, call it like this:

    private void MoveCanvas(List<double> list, double dYpuntero)
    {
        if (HasLessThan100(list))
        {
            list.Add((double)dYpuntero);
        }

        else return;
    }