/// <summary>
/// Scan the sprites to find those that contain the specified position.
/// Returns an array of all matching sprites.
/// </summary>
/// <param name="testPosition"></param>
public SpriteObject GetSpriteAtPoint(Vector2 testPosition)
{
SpriteObject spriteObj;
SpriteObject ret = null;
float lowestLayerDepth = float.MaxValue;
// Loop for all of the SelectableSpriteObjects
foreach (GameObjectBase obj in GameObjects)
{
// Is this a SpriteObject?
if (obj is SpriteObject)
{
// Yes... Cast it to a SelectableSpriteObject
spriteObj = (SpriteObject)obj;
// Is its layerdepth the same or lower than the lowest we have seen so far?
// If not, previously encountered objects are in front of this one
// and so we have no need to check it.
if (spriteObj.LayerDepth <= lowestLayerDepth)
{
// Is the point in the object?
if (spriteObj.IsPointInObject(testPosition))
{
// Mark this as the current frontmost object
// and remember its layerdepth for future checks
ret = spriteObj;
lowestLayerDepth = spriteObj.LayerDepth;
}
}
}
}
return(ret);
}
/// <summary>
/// Scan the sprites to find those that contain the specified position.
/// Returns an array of all matching sprites.
/// </summary>
/// <param name="testPosition"></param>
public SpriteObject[] GetSpritesAtPoint(Vector2 testPosition)
{
SpriteObject spriteObj;
SpriteObject[] hits = new SpriteObject[GameObjects.Count];
int hitCount = 0;
// Loop for all of the SelectableSpriteObjects
foreach (GameObjectBase obj in GameObjects)
{
// Is this a SpriteObject?
if (obj is SpriteObject)
{
// Yes... Cast it to a SelectableSpriteObject
spriteObj = (SpriteObject)obj;
// Is the point in the object?
if (spriteObj.IsPointInObject(testPosition))
{
// Add to the array
hits[hitCount] = spriteObj;
hitCount += 1;
}
}
}
// Trim the empty space from the end of the array
Array.Resize(ref hits, hitCount);
return(hits);
}
