Efficient way to display a walked path.

I have an object that has coordinates [x,y], the object moves in the x-y plane. The plane is described by a circular set of datapoints, as shown in the figure below.

I wish to display the "path" the object has taken (red) , and the current location (green).

I was thinking of displaying it something like the lower image, but any other way would be usefull too.

Any suggestions? (I'm not asking for any code :), I can figure that out on my own)

Answer 1

[Image Analyst]

Assuming you have the (x,y) coordinates of the path, just use plot() and pick a really wide line width.

plot(x, y, 'LineWidth', 10);

Answer 2

[per isakson]

Something looking similar to the upper diagram can be achieved with a couple of transparent pathes (handle graphic objects) on top.

See

• patch, Create one or more filled polygons
• fill, Filled 2-D polygons

Patches comes with a bit of learning curve. Try fill first.

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The lower diagram can be done with a line object on top. See

• line, Create line object
• Plot line transparency and color gradient

R2014b came with improved graphic features. The links above ara to R2014b.

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The key to "efficient" (fast) is to modify graphic objects, not delete and recreate objects, and not create many thousands of objects.