Time for action – building the Gemstone class

1. Add a new class file called Gemstone.cs to the Gemstone Hunter project.

2. Add the following using directives to the Gemstone class:

   using Microsoft.Xna.Framework;
   using Microsoft.Xna.Framework.Content;
   using Microsoft.Xna.Framework.Graphics;
   using Tile_Engine;

3. Modify the declaration of the Gemstone class to make the class public, and derive it from the GameObject class:

   public class Gemstone : GameObject

4. Add a constructor for the Gemstone class:

   #region Constructor
   public Gemstone(ContentManager Content, int cellX, int cellY)
   {
       worldLocation.X = TileMap.TileWidth * cellX;
       worldLocation.Y = TileMap.TileHeight * cellY;
   
       frameWidth = TileMap.TileWidth;
       frameHeight = TileMap.TileHeight;
   
       animations.Add("idle",
           new AnimationStrip(
               Content.Load<Texture2D>(@"Textures\Gem"),
               48,
               "idle"));
   
       animations["idle"].LoopAnimation = true;
       animations["idle"].FrameLength = 0.15f;
       PlayAnimation...