/// <summary>
/// Checks if there is a non transparent pixel in a renderer in this transform under the mouse. If
/// the transform has a TilemapRenderer, simply returns that renderer.
/// </summary>
/// <param name="transform">transform to check</param>
/// <param name="recentTouches">Dictionary from touch position to the pixel color and time the touch occurred,
/// will be updated with the hit information if a hit occurs.</param>
/// <returns>spriterenderer that was hit if there is a hit, or tilemaprenderer if transform has one</returns>
public static Renderer IsPixelHit(Transform transform,
Dictionary <Vector2, Tuple <Color, float> > recentTouches = null)
{
var tilemapRenderer = transform.gameObject.GetComponent <TilemapRenderer>();
if (tilemapRenderer != null)
{
return(tilemapRenderer);
}
SpriteRenderer[] spriteRenderers = transform.GetComponentsInChildren <SpriteRenderer>(false);
//check order in layer for what should be triggered first
//each item ontop of a table should have a higher order in layer
SpriteRenderer[] bySortingOrder =
spriteRenderers.OrderByDescending(sRenderer => sRenderer.sortingOrder).ToArray();
for (var i = 0; i < bySortingOrder.Length; i++)
{
SpriteRenderer spriteRenderer = bySortingOrder[i];
Sprite sprite = spriteRenderer.sprite;
if (spriteRenderer.enabled && sprite && spriteRenderer.color.a > 0)
{
MouseUtils.GetSpritePixelColorUnderMousePointer(spriteRenderer, out Color pixelColor);
if (pixelColor.a > 0)
{
var mousePos = Camera.main.ScreenToWorldPoint(CommonInput.mousePosition);
if (recentTouches != null)
{
if (recentTouches.ContainsKey(mousePos))
{
recentTouches.Remove(mousePos);
}
recentTouches.Add(mousePos, new Tuple <Color, float>(pixelColor, Time.time));
}
return(spriteRenderer);
}
}
}
return(null);
}