protected void OnTriggerEnter2D(Collider2D collider)
{
if (!collider.CompareTag("Terrain"))
{
return;
}
var terrain = collider.GetComponent <TerrainPiece>();
if (terrain == null)
{
return;
}
// Terrain was created inside the trigger. Don't notify about it since
// it is probably the initial terrain generation when the game starts.
if (IsFullyInside(terrain))
{
return;
}
// Terrain was not created inside - Wait for it to fully enter.
if (polledPiece == null || polledPiece.RightEdge < terrain.RightEdge)
{
polledPiece = terrain;
}
}
protected void FixedUpdate()
{
if (polledPiece != null && IsFullyInside(polledPiece))
{
polledPiece = null;
// The piece is inside. Notify listeners and accept the next piece.
if (OnTerrainEnteredScreen != null)
{
OnTerrainEnteredScreen();
}
}
}
/// <summary>
/// Assuming terrain is moving from right to left, a terrain piece is fully
/// inside the trigger if its right edge is before the trigger's right edge.
/// </summary>
private bool IsFullyInside(TerrainPiece terrain)
{
var triggerRightEdge = trigger.bounds.max.x;
return(terrain.RightEdge <= triggerRightEdge);
}