在讨论该解决方案的地图绘制部分之前，您需要了解如何将一个简单的三个字母的字符串(如den)转换为地图上的一点。
Before I can get to the mapping part of the solution, you need to understand how a simple three-letter string like DEN gets converted to a point on a map.
对象有绘制点、字符串、直线、圆弧、椭圆和许多其他形状的方法。
Object has methods to draw points, strings, lines, arcs, ellipses, and many other shapes.
如果有一个鼠标单击事件发生，它将在客户区中鼠标光标的位置处绘制这个字符串。
If at least one mouse click has occurred, it draws the string in the client area at the mouse position.
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