• Draws a polyline on a map
• Using vector drawing facilities, if available
• Using image overlays for some browsers
• May be constructed by giving it a number of points
• new GPolyline([new GLatLng(..), …, new GLatLng(..)])
• Or from an encoded string
• GPolygon.fromEncoded({points: "yzocFzynhVq}@n}@o}@nzD", ... })
• May be generated by interactive map tools