+ /**
+ * Start fading the tilemap to opacity given by @c alpha.
+ * Destination opacity will be reached after @c seconds seconds. Also influences solidity.
+ */
+ void fade(float alpha, float seconds = 0);
+
+ /**
+ * Instantly switch tilemap's opacity to @c alpha. Also influences solidity.
+ */
+ void set_alpha(float alpha);
+
+ /**
+ * Return tilemap's opacity. Note that while the tilemap is fading in or out, this will return the current alpha value, not the target alpha.
+ */
+ float get_alpha();
+