多边形的各个点都将被添加到第23行的临时图形中，并且如果它是多边形中的第一个点，则把其位置记录为注释该部分的文本的位置。
Each point of the polygon is added to the temporary shape on line 23, and if it's the first point in the polygon, its location is recorded as the placement for the text annotating that piece.
您也可以方便地将不同的组件（标记、信息文本、控件、地面叠加（ground overlays）、多边形和折线）添加到结果地图中。
You could also easily attach different components (markers, information texts, controls, ground overlays, polygons, and polylines) to the resulting map.
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