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PO'particleEngine' being drawn against a vector
 

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    <p>I'm using XNA and C#.</p> <p>I have a problem with calling a vector variable from my <code>particleEmitter</code>. I can draw the particle just fine if it is static or not moving. And when I have a vector variable that is set to a fixed position of (x,y) it's okay and draws on the screen. But if I have a vector variable that has been set to move in the x or y axis it does not draw at all.</p> <p>Declared variables:</p> <pre><code>Vector2 shipPos; float shipMovement; ParticleEngine particleEngine; </code></pre> <p>And a method that loads stuff about what should happen with the vectors and the way it should behave:</p> <pre><code>public void loadEmitter(GameTime gameTime) { shipMovement = 2f; shipPos.Y -= shipMovement; particleEngine.EmitterLocation = new Vector2(shipPos.X,shipPos.Y); } </code></pre> <p>I'm trying to get <code>particleEngine</code> to trail the movement of a ship. What I can't seem to do is get it to draw when I set this up to happen.</p> <p><strong>Other info:</strong> <code>ParticleEngine</code> is a class in itself and basically sets some parameters about how the particles I will be drawing should behave. I have other screens with the <code>spritebatch</code> <code>Begin</code> and <code>End</code> calls. Other than that, here's the code for my main class:</p> <pre><code>namespace PlanetDrill2 { class LaunchScreen : Screen { Texture2D LaunchScreenTexture; Texture2D shipLaunch; Vector2 shipPos; float shipMovement; ParticleEngine particleEngine; Vector2 smokePos; public LaunchScreen(Game game, SpriteBatch batch, ChangeScreen changeScreen) : base(game, batch, changeScreen) { } protected override void SetupInputs() { base.SetupInputs(); } public override void Activate() { base.Activate(); } public void LaunchShip() { } public void loadEmitter(GameTime gameTime) { shipMovement = 2f; shipPos.Y -= shipMovement; particleEngine.EmitterLocation = new Vector2(shipPos.X,shipPos.Y); } protected override void LoadScreenContent(ContentManager content) { LaunchScreenTexture = content.Load&lt;Texture2D&gt;("launchTest"); shipLaunch = content.Load&lt;Texture2D&gt;("shipLaunch"); List&lt;Texture2D&gt; textures = new List&lt;Texture2D&gt;(); textures.Add(content.Load&lt;Texture2D&gt;("smoketexture")); particleEngine = new ParticleEngine(textures, new Vector2(0, 0)); base.LoadScreenContent(content); } protected override void UpdateScreen(GameTime gameTime, DisplayOrientation screenOrientation) { //if (gameTime.TotalGameTime.Seconds&gt;10) //{ // changeScreenDelegate(ScreenState.UMA); //} loadEmitter(gameTime); particleEngine.Update(); base.UpdateScreen(gameTime, screenOrientation); } protected override void DrawScreen(SpriteBatch batch, DisplayOrientation screenOrientation) { batch.Draw(LaunchScreenTexture, Vector2.Zero, Color.White); batch.Draw(shipLaunch, new Vector2(80, 450) +shipPos, Color.White); particleEngine.Draw(batch); base.DrawScreen(batch, screenOrientation); } protected override void SaveScreenState() { base.SaveScreenState(); } } // end class LaunchScreen } // end namespace PlanetDrill2 </code></pre>
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