+ *
+ * Basically, a linear constrainer allows constraining a property to another property
+ * with the changes mapped over a certain range. For example, if you want to change the
+ * opacity of an actor depending on its position along the X-axis, so that it’s fully
+ * transparent on the edges and fully opaque in the center. To do this, an array with
+ * values, 0.0f, 1.0f, 0.0f, is created, which means that there are 3 control points.
+ * You can add as many control points as you want, but they will be linearly spaced.
+ * Then you can apply the linear constrainer by using the alpha of the actor as the
+ * target and the source as the actor’s position.
+ * @SINCE_1_0.0