Gets or sets the world position to use instead of the pointer position for this annotation layer. If you set this value, rather than responding to the pointer, this layer will be fixed on the provided world position. A world position has x and y values that range from 0 to 1 that represent the global position of the cursor relative to the entire ranges of the axes. The default of (NaN, NaN) means that the layer should react to pointer movement.
Target Platforms: Android 4.4+, iOS 8+
Development Environments: Visual Studio 2015+, Visual Studio for Mac Preview, Xamarin for Visual Studio 4.2+
