Databases
StackOverflow2013
Postsdbo
POXna Pixel Collision and multi-layers. Early Collision, wrong detection?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POXna Pixel Collision and multi-layers. Early Collision, wrong detection?
    primarykey
    data
    text
    <p>we are currently working on a Xna game for college. We are testing something first before we put in our own textures etc.</p> <p>So we watch a lot tutorials and went through a lot of code. Right now we have this little Program running: <a href="http://www.konter.at/Konter_Game.rar" rel="nofollow">http://www.konter.at/Konter_Game.rar</a></p> <p>So this the GameScreen, where we load the player and the Background and everything we want to use.</p> <pre><code>namespace Casual_Game { public class GameplayScreen : GameScreen { Player player; Camera camera; SpriteFont font; private List&lt;Layer&gt; layers; private SpriteBatch _spriteBatch; Rectangle recPlayer, recGround; bool colis = false; Collision collision; public override void LoadContent(ContentManager content, InputManager input) { camera = new Camera(Game1.reference.GraphicsDevice.Viewport) { Limits = new Rectangle(0, 0, 4800, 720) }; collision = new Collision(); _spriteBatch = new SpriteBatch(Game1.reference.GraphicsDevice); base.LoadContent(content, input); player = new Player(); player.LoadContent(content, input); font = content.Load&lt;SpriteFont&gt;("Font1"); layers = new List&lt;Layer&gt; { new Layer(camera) { Parallax = new Vector2(0.0f, 1.0f) }, new Layer(camera) { Parallax = new Vector2(0.1f, 1.0f) }, new Layer(camera) { Parallax = new Vector2(0.2f, 1.0f) }, new Layer(camera) { Parallax = new Vector2(0.3f, 1.0f) }, new Layer(camera) { Parallax = new Vector2(0.4f, 1.0f) }, new Layer(camera) { Parallax = new Vector2(0.5f, 1.0f) }, new Layer(camera) { Parallax = new Vector2(0.6f, 1.0f) }, new Layer(camera) { Parallax = new Vector2(0.8f, 1.0f) }, new Layer(camera) { Parallax = new Vector2(1.0f, 1.0f) } }; // Add one sprite to each layer }); layers[1].Sprites.Add(new Sprite { texture = content.Load&lt;Texture2D&gt;("Textures/Layer2") }); layers[2].Sprites.Add(new Sprite { texture = content.Load&lt;Texture2D&gt;("Textures/Layer3") }); layers[3].Sprites.Add(new Sprite { texture = content.Load&lt;Texture2D&gt;("Textures/Layer4") }); layers[4].Sprites.Add(new Sprite { texture = content.Load&lt;Texture2D&gt;("Textures/Layer5") }); layers[7].Sprites.Add(new Sprite { texture = content.Load&lt;Texture2D&gt;("Textures/Layer8") }); layers[8].Sprites.Add(new Sprite { texture = content.Load&lt;Texture2D&gt;("Textures/Layer9") }); // Add a few duplicates in different positions layers[7].Sprites.Add(new Sprite { texture = content.Load&lt;Texture2D&gt;("Textures/Layer8"), position = new Vector2(900, 0) }); layers[7].Sprites.Add(new Sprite { texture = content.Load&lt;Texture2D&gt;("Textures/Layer8"), position = new Vector2(1400, 0) }); layers[7].Sprites.Add(new Sprite { texture = content.Load&lt;Texture2D&gt;("Textures/Layer8"), position = new Vector2(2700, 0) }); layers[8].Sprites.Add(new Sprite { texture = content.Load&lt;Texture2D&gt;("Textures/Layer9"), position = new Vector2(1600, 0) }); layers[8].Sprites.Add(new Sprite { texture = content.Load&lt;Texture2D&gt;("Textures/Layer9"), position = new Vector2(3200, 0) }); layers[8].Sprites.Add(new Sprite { texture = content.Load&lt;Texture2D&gt;("Textures/Layer9"), position = new Vector2(4800, 0) }); } public override void UnloadContent() { base.UnloadContent(); } public override void Update(GameTime gameTime) { player.Update(gameTime); recGround = new Rectangle((int)layers[8].Sprites[0].Position.X, (int)layers[8].Sprites[0].Position.Y, layers[8].Sprites[0].Texture.Width, layers[8].Sprites[0].Texture.Height); recPlayer = new Rectangle((int)player.Position.X, (int)player.Position.Y, player.Image.Width, player.Image.Height); float elapsedTime = (float)gameTime.ElapsedGameTime.TotalSeconds; KeyboardState keyboardState = Keyboard.GetState(); if (keyboardState.IsKeyDown(Keys.Right)) camera.Move(new Vector2(200.0f * (float)gameTime.ElapsedGameTime.TotalSeconds, 0.0f), true); if (keyboardState.IsKeyDown(Keys.Left)) camera.Move(new Vector2(-200.0f * (float)gameTime.ElapsedGameTime.TotalSeconds, 0.0f), true); if (keyboardState.IsKeyDown(Keys.Down)) camera.Move(new Vector2(0.0f, 400.0f * elapsedTime), true); if (keyboardState.IsKeyDown(Keys.Up)) camera.Move(new Vector2(0.0f, -400.0f * elapsedTime), true); if (recPlayer.Intersects(recGround)) { if (collision.PixelCollision(player.Image, layers[8].Sprites[0].Texture, recPlayer, recGround)) { player.Collision = true; colis = true; } else { player.Collision = false; colis = false; } } else { player.Collision = false; colis = false; } camera.LookAt(player.Position); base.Update(gameTime); } public override void Draw(SpriteBatch spriteBatch) { Vector2 parallax = new Vector2(1.0f); _spriteBatch.Begin(SpriteSortMode.Deferred,null , null, null, null, null, camera.GetViewMatrix(parallax)); foreach (Layer layer in layers) layer.Draw(_spriteBatch); player.Draw(_spriteBatch); spriteBatch.DrawString(font, "Player X : " + player.Position.X.ToString(),new Vector2(10, 10), Color.Black); spriteBatch.DrawString(font, "CameraX :" + camera._position.X.ToString(), new Vector2(10, 25), Color.Black); spriteBatch.DrawString(font, "CameraY :" + camera._position.Y.ToString(), new Vector2(10, 40), Color.Black); spriteBatch.DrawString(font, "Col : " + colis.ToString(), new Vector2(10, 55), Color.Black); _spriteBatch.End(); } } </code></pre> <p>You see it is a Parallax Background with different Layers. On Layer[8] is the "Ground" where our player would run on later.</p> <p>The Problem now is that the Collision Detection is not working correctly. It looks like the detection is loading to slow or something.</p> <p>We have in mind, that the player will hit the ground with the detection. So he has no value where he stops on the ground. So it has to be exate.</p> <p>This is the Collision Class:</p> <pre><code> public bool PixelCollision(Texture2D sprite1, Texture2D sprite2, Rectangle player, Rectangle enemy) { Color[] colorData1 = new Color[sprite1.Width * sprite1.Height]; Color[] colorData2 = new Color[sprite2.Width * sprite2.Height]; sprite1.GetData&lt;Color&gt;(colorData1); sprite2.GetData&lt;Color&gt;(colorData2); int top, bottom, left, right; top = Math.Max(player.Top, enemy.Top); bottom = Math.Min(player.Bottom, enemy.Bottom); left = Math.Max(player.Left, enemy.Left); right = Math.Min(player.Right, enemy.Right); for (int y = top; y &lt; bottom; y++) { for (int x = left; x &lt; right; x++) { Color A = colorData1[(y - player.Top) * (player.Width) + (x - player.Left)]; Color B = colorData2[(y - enemy.Top) * (enemy.Width) + (x - enemy.Left)]; if (A.A != 0 &amp;&amp; B.A != 0) return true; } } return false; } } </code></pre> <p>We would be very happy if someone could help us figure that out. We are not that much of programmers. So we thought asking doesnt cost anything. :)</p> <p>K.</p> <p>Edit: Player.Update and Draw:</p> <pre><code>public override void Update(GameTime gameTime) { moveAnimation.IsActive = true; inputManager.Update(); if (inputManager.KeyDown(Keys.Right, Keys.A)) { moveAnimation.currentFrame = new Vector2(moveAnimation.CurrentFrame.X, 2); velocity.X = moveSpeed * (float)gameTime.ElapsedGameTime.TotalSeconds; } else if (inputManager.KeyDown(Keys.Left, Keys.A)) { moveAnimation.currentFrame = new Vector2(moveAnimation.CurrentFrame.X, 1); velocity.X = -moveSpeed * (float)gameTime.ElapsedGameTime.TotalSeconds; } else { velocity.X = 0; moveAnimation.IsActive = false; } if (inputManager.KeyDown(Keys.Up, Keys.W) &amp;&amp; jump) { velocity.Y = -jumpSpeed * (float)gameTime.ElapsedGameTime.TotalSeconds; //Position += theDirection * theSpeed * (float)theGameTime.ElapsedGameTime.TotalSeconds; jump = false; } if (!jump) velocity.Y += gravity * (float)gameTime.ElapsedGameTime.TotalSeconds; else velocity.Y = 0; moveAnimation.Position = position += velocity; jump = moveAnimation.Position.Y &gt;= 480; if (jump) position.Y = 480; base.Update(gameTime); moveAnimation.Update(gameTime); } public override void Draw(SpriteBatch spriteBatch) { moveAnimation.Draw(spriteBatch); } </code></pre> <p>Layer.Draw:</p> <pre><code>public class Layer { SpriteBatch spr1teBatch; public Layer(Camera camera) { _camera = camera; Parallax = Vector2.One; Sprites = new List&lt;Sprite&gt;(); spr1teBatch = new SpriteBatch(Game1.reference.GraphicsDevice ); } public Vector2 Parallax { get; set; } public List&lt;Sprite&gt; Sprites { get; private set; } public void Draw(SpriteBatch spriteBatch) { spr1teBatch.Begin(SpriteSortMode.Deferred, null, null, null, null, null, _camera.GetViewMatrix(Parallax)); foreach(Sprite sprite in Sprites) sprite.Draw(spr1teBatch); spr1teBatch.End(); } public Vector2 WorldToScreen(Vector2 worldPosition) { return Vector2.Transform(worldPosition, _camera.GetViewMatrix(Parallax)); } public Vector2 ScreenToWorld(Vector2 screenPosition) { return Vector2.Transform(screenPosition, Matrix.Invert(_camera.GetViewMatrix(Parallax))); } private readonly Camera _camera; } </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USK213
    1. USK213
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POXna Pixel Collision and multi-layers. Early Collision, wrong detection?
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POXna Pixel Collision and multi-layers. Early Collision, wrong detection?
      1. This table or related slice is empty.
      1. VTUpMod
    1. COAre player and ground textures changing often? If not, could you try extracting color data for those textures once (in `LoadContent()` for example), and then passing that data to your collision detection? Just so that you don't need to use `GetData()` every time.
      singulars
      1. POXna Pixel Collision and multi-layers. Early Collision, wrong detection?
      1. USneeKo
    2. COYour collision code looks fine. What do you expect on a detected collision? You just set `player.Collision` to `true` and then? Btw, exact collision detection is very rarely a good idea because mostly Frame rate is changing which affects the movement of objects.
      singulars
      1. POXna Pixel Collision and multi-layers. Early Collision, wrong detection?
      1. USNico Schertler
    3. COThe Ground Texture will only be loaded ones I think, but the Player texture will be different with different moves and interactions.
      singulars
      1. POXna Pixel Collision and multi-layers. Early Collision, wrong detection?
      1. USK213
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload