source: 2015/26/MikkoL/JRPG/JRPG/JRPG/Pointer.cs @ 6305

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Jypeli;

public class Pointer : Widget
{
    Widget Border = new Widget(24, 24);

    public Vector BorderPosition
    {
        get
        {
            return Border.Position;
        }
        set
        {
            Border.Position = value;
            Position = value + new Vector(0, -1);
        }
    }

    private Timer FlashTimer { get; set; }
    private bool _IsFlashing = false;
    public float FlashSpeed = 0.002f;
    public bool IsFlashing
    {
        get
        {
            return _IsFlashing;
        }
        set
        {
            _IsFlashing = value;
            if (value)
            {
                FlashTimer.Start();
            }
            else if (!value)
            {
                FlashTimer.Stop();
            }
        }
    }

    public Pointer (Vector Position)
        : base(24, 25, Shape.Triangle)
    {
        this.Angle = Angle.FromDegrees(180);
        this.Position = Position + new Vector(0,-1);
        Border.Image = Images.HUD.Pointer;
        Border.Position = Position;

        float LerpAmount = 0;
        bool Increase = true;

        FlashTimer = new Timer();
        FlashTimer.Interval = 0.001;
        FlashTimer.Timeout += delegate
        {
            if (LerpAmount > 1.0f) Increase = false;
            else if (LerpAmount < 0.0f) Increase = true;

            if (Increase)
            {
                LerpAmount = LerpAmount + FlashSpeed;
            }
            else if (!Increase)
            {
                LerpAmount = LerpAmount - FlashSpeed;
            }

            Color = Color.Lerp(Color.White, Color.Gold, LerpAmount);
        };

        AddedToGame += delegate
        {
            JRPG.Game.Add(Border);
        };

        Destroyed += delegate
        {
            Border.Destroy();
        };
    }
}