ProtectedalgorithmProtectedclustersProtectedidleProtectedmapProtectedmarkersProtectedrendererOptionalnoDraw: booleanOptionalnoDraw: booleanOptionalnoDraw: booleanImplement this method to initialize the overlay DOM elements. This method is called once after setMap() is called with a valid map. At this point, panes and projection will have been initialized.
Implement this method to remove your elements from the DOM. This method is called once following a call to setMap(null).
OptionalnoDraw: booleanOptionalnoDraw: booleanRecalculates and draws all the marker clusters.
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MarkerClusterer creates and manages per-zoom-level clusters for large amounts of markers. See MarkerClustererOptions for more details.