Use VML to draw tracks on a map

In the WebGIS project, we may often encounter the need to dynamically draw trajectory routes on maps, such as GPS tracks, bus routes, and traffic directions. VML is the simplest implementation method. The full name of VML Is Vector Markup Language (Vector Markup Language). Vector Graphics mean that graphics can be scaled up or down without losing the quality of graphics, this is useful for creating maps.

In practical applications, we often implement this method. First, we obtain the geographic coordinates of the trajectory, and then convert it into screen coordinates (such as toscreenpoint in AGS) through the interface ), upload the screen coordinate array to Js for painting. Here, we use js to dynamically Add the VML line step to dynamically draw the trajectory route. You can also extend it, such as the tips prompt when a node is reached.

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Source: http://www.cnblogs.com/hjcook/archive/2009/06/04/1496376.html