/// <summary>
/// Detects and resolves collisions between the Player and the glidingPlatform nearest him.
/// </summary>
public void HandleGlidingPlatformCollisions()
{
// Did I just collide with a gliding platform?
foreach (GlidingPlatform platform in Level.playerPlatforms)
// To know this we have to check the list of platforms in
// the camera's visible range
// which we collected from the level calss
{
// We check if the player's feet intersect with the platform's surface.
if (platform.Surface.Intersects(Feet))
{
OnPlatform(platform); // If so, then this is the platform we want to save.
}
}
// If I own a platform
if (isOnPlatform == true)
{
// reset isOnPlatform for the purposes of evaluating it again.
isOnPlatform = false;
// Do they intersect?
if (Feet.Intersects(platform.Surface))
{
isOnPlatform = true;
//Yes they intersect. By how deep?
Vector2 depth = RectangleExtensions.GetIntersectionDepth(Feet, platform.Surface);
// Is it more than zero?
if (depth != Vector2.Zero)
{
// Yes they intersect and it is more than zero depth!
// Find out by how much.
float absDepthX = Math.Abs(depth.X);
float absDepthY = Math.Abs(depth.Y);
// Act as if we are on the ground if we were previously on the a platform.
if (previousBottom >= platform.Surface.Top)
{
isOnGround = true;
}
if (isOnPlatform)
{
// Resolve the collision along the Y axis.
Position = new Vector2(Position.X /*+ platform.Position.X*/, Position.Y - Math.Abs(depth.Y));
}
}
}
}
// Check if the player's Y has moved through a platform's surface.
foreach (GlidingPlatform platform in level.playerPlatforms)
{
if ((position.Y > platform.Surface.Top - 12) && (position.Y < platform.Surface.Top + 12) &&
(position.X > platform.Surface.Left - BoundingRectangle.Width / 2) &&
(position.X < platform.Surface.Right + BoundingRectangle.Width / 2) &&
(velocity.Y > 0)) // if the velocity is negative the player is jumping up.
// If the player is jumping up, we don't want him to stick, only when moving down.
// The speed the player moves with a MaxFallSpeed of 600.0f is 12 pixels per second.
// If we don't check this condition, the player can jump right past the surface of the platform,
// and the game will never know to make the player stick!
{
OnPlatform(platform);
position.Y = platform.Surface.Top;
}
}
previousBottom = BoundingRectangle.Bottom;
}
