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POXNA 2D Platformer Collision and Gravity
 

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  1. POXNA 2D Platformer Collision and Gravity
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    <p>I know this question might get asked a lot and for that I am sorry. But I have had trouble with collisions in my game for a while and I would like some help.</p> <p>First off, the game is a 2D Platformer. Each solid is put in a list. I have this code for collision detection which works pretty good for me:</p> <pre><code> if (player.rectangle.Intersects(rect)) { player1Collision = true; colSolid = solid; colRectangle = rect; } if (player1Collision) { Vector2 pos = player.position; Vector2 pLeft = new Vector2(player.BoundingBox.Left, 0); Vector2 pRight = new Vector2(player.BoundingBox.Right, 0); Vector2 pTop = new Vector2(0, player.BoundingBox.Top); Vector2 pBottom = new Vector2(0, player.BoundingBox.Bottom); Vector2 sLeft = new Vector2(colSolid.BoundingBox.Left, 0); Vector2 sRight = new Vector2(colSolid.BoundingBox.Right, 0); Vector2 sTop = new Vector2(0, colSolid.BoundingBox.Top); Vector2 sBottom = new Vector2(0, colSolid.BoundingBox.Bottom); if (player.rectangle.Intersects(colRectangle)) { if (player.velocity.X &gt; 0 &amp;&amp; Vector2.Distance(pRight, sLeft) &lt; player.texture.Width / 2)//left { player.velocity.X = 0f; pos.X = colSolid.BoundingBox.Left - player.BoundingBox.Width; } else if (player.velocity.X &lt; 0 &amp;&amp; Vector2.Distance(pLeft, sRight) &lt; player.texture.Width / 2)//right { player.velocity.X = 0f; pos.X = colSolid.BoundingBox.Right; } if (player.velocity.Y &gt; 0 &amp;&amp; Vector2.Distance(pBottom, sTop) &lt; player.texture.Height/ 2) //top { player.velocity.Y = 0f; player.gravityOn = false; pos.Y = colSolid.BoundingBox.Top - player.BoundingBox.Height; } else if (player.velocity.Y &lt; 0 &amp;&amp; Vector2.Distance(pTop, sBottom) &lt; player.texture.Height / 2)//bottom { player.velocity.Y = 0f; pos.Y = colSolid.BoundingBox.Bottom; } player.position = pos; } else { player.gravitySpeed = 0.15f; player.gravityOn = true; } } </code></pre> <p>However the problem is that if the player is not intersecting with the rectangle I set the gravity to on, therefore he falls continuously as he collides with the solid and then is put on top to not collide with it. All I need to know is: how can I avoid this? Is there any other way that I could set the gravity to on without the player falling towards the solid continuously, only to be put back on top of the solid to fall again?</p> <p>Any help is appreciated.</p>
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    1. USNick M
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    1. COThis question may be better suited to our [gamedev site](http://gamedev.stackexchange.com). Let me know if you want me to flag this for migration.
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      1. POXNA 2D Platformer Collision and Gravity
      1. USJohn McDonald
 

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