Lesson goal: Draw a trail

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In the lesson on markers, you saw how setmarker could be used to place a famous red Google Markers on a map. In this lesson, you'll see how you can draw a smooth trail (or line) through a bunch of latitude,longitude points.

Drawing a trail involves telling the map a bunch of points through which the trail should be drawn. These points are best organized in two arrays: one array for the latitudes, and the other for the longitudes. Thus, we give you drawtrail, that works like this:

drawtrail(lat-array,long-array)
Move the mouse over a dotted box for more information.

Now you try. Try out our demonstration, but next, draw a square around your house or school.

Type your code here:


See your results here:

This code will draw a trianglular trail around the Bermuda Triangle. Dismiss.
Show a friend, family member, or teacher what you've done!

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Does your code work? Want to run it on your iPhone?

Here's your code:

  1. Use [Control]-[C] (Windows) or [⌘]-[C] (MacOS) to copy your code.

  2. Paste it using [Control]-[V] (Windows) or [⌘]-[V] (MacOS) into this page

  3. Then click the "Use on iPhone" button that you'll see.