Dear XNA Community,


  While designing a trackbar component for an XNA game of mine I was having some issues. I've included the source of the TrackBar/slider at the bottom of this post. Basically, the issue I am having is increasing or decreasing the value of the trackbar depending on where you click on it. Assistance is very much appreciated.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;

namespace CoreEngine
{
    public class TrackBar : Component
    {
        //Slider values.
        private int iMin = 0;
        private int iMax = 0;
        private int iValue = 0;
        SpriteFont Font;
        public Vector2 Pos = new Vector2(0, 0);
        float ArrowPos;

        //Images and textures for the trackbar.
        Texture2D Slider;
        Texture2D Arrow;
        Texture2D CollRect;

        //Rectangles used for collision.
        Rectangle mouseRectangle;
        Rectangle sliderRectangle;

        public int Max
        {
            get
            {
                return iMax;
            }

            set
            {
                iMax = value;
            }
        }

        public int Min
        {
            get
            {
                return iMin;
            }

            set
            {
                iMin = value;
            }
        }

        public int Value
        {
            get { return iValue; }
            set
            {
                iValue = value;

                if (Value > Max)
                    iValue = Max;
                if (Value < Min)
                    iValue = Min;
            }
        }

        public TrackBar(int min, int max, int value, Vector2 pos)
        {
            Min = min;
            Max = max;
            Value = value;
            Pos = pos;

            //Load all our graphics.
            Slider = Engine.Content.Load<Texture2D>("Content\\Graphics\\UI\\Slider");
            Font = Engine.Content.Load<SpriteFont>("Content/Graphics/Fonts/DropMenuText");
            Arrow = Engine.Content.Load<Texture2D>("Content\\Graphics\\UI\\Arrow");
            CollRect = Engine.Content.Load<Texture2D>("Content\\CollRect");

            ArrowPos = Pos.X;
        }

        public override void Draw()
        {

            Engine.SpriteBatch.Begin(SpriteBlendMode.AlphaBlend, SpriteSortMode.Immediate, SaveStateMode.None, Engine.SpriteScale);

            Engine.SpriteBatch.Draw(Slider, new Rectangle((int)Pos.X, (int)Pos.Y, Max + 10, Slider.Height), Color.White);
            Engine.SpriteBatch.DrawString(Font, Convert.ToString(Value), new Vector2(Pos.X + Max + 20, Pos.Y - 5), Color.White, 0, Vector2.Zero, 0.7f, SpriteEffects.None, 1);
            Engine.SpriteBatch.Draw(Arrow, new Rectangle((int)Pos.X + Value, (int)Pos.Y, Arrow.Width, Arrow.Height), Color.Black);

            Engine.SpriteBatch.End();

        }

        public override void Update()
        {
            mouseRectangle = new Rectangle(Engine.Services.GetService<MouseDevice>().State.X, Engine.Services.GetService<MouseDevice>().State.Y, 3, 3);
            sliderRectangle = Conversions.ScaleRectangle(new Rectangle((int)Pos.X, (int)Pos.Y, Max, Slider.Height));

            if (mouseRectangle.Intersects(sliderRectangle))
            {
                if (Engine.ScreenW < 1920)
                    Value = Value = (int)(mouseRectangle.X - Conversions.ScaleVector(Pos).X);
                else
                    Value = (int)(mouseRectangle.X - Pos.X);
            }

        }
    }
}