This object is made available to the OverlayView from within the draw method. It is not guaranteed to be initialized until draw is called.

Methods
`fromContainerPixelToLatLng`	`fromContainerPixelToLatLng(pixel[, nowrap])` Parameters: `pixel`: `Point optional` `nowrap`: `boolean optional` Return Value: `LatLng optional` Computes the geographical coordinates from pixel coordinates in the map's container.
`fromDivPixelToLatLng`	`fromDivPixelToLatLng(pixel[, nowrap])` Parameters: `pixel`: `Point optional` `nowrap`: `boolean optional` Return Value: `LatLng optional` Computes the geographical coordinates from pixel coordinates in the div that holds the draggable map.
`fromLatLngToContainerPixel`	`fromLatLngToContainerPixel(latLng)` Parameters: `latLng`: `LatLng optional` Return Value: `Point optional` Computes the pixel coordinates of the given geographical location in the map's container element.
`fromLatLngToDivPixel`	`fromLatLngToDivPixel(latLng)` Parameters: `latLng`: `LatLng optional` Return Value: `Point optional` Computes the pixel coordinates of the given geographical location in the DOM element that holds the draggable map.
`getWorldWidth`	`getWorldWidth()` Parameters: None Return Value: `number` The width of the world in pixels in the current zoom level. For projections with a heading angle of either 90 or 270 degrees, this corresponds to the pixel span in the Y-axis.

MapCanvasProjection interface