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Efficient way to display a walked path.

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luc
luc 2014-12-23
回答： Image Analyst 2014-12-23
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)

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Image Analyst
Image Analyst 2014-12-23
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);

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per isakson
per isakson 2014-12-23
编辑：per isakson 2014-12-23
Something looking similar to the upper diagram can be achieved with a couple of transparent pathes (handle graphic objects) on top.
See
Patches comes with a bit of learning curve. Try fill first.
&nbsp
The lower diagram can be done with a line object on top. See
R2014b came with improved graphic features. The links above ara to R2014b.
&nbsp
The key to "efficient" (fast) is to modify graphic objects, not delete and recreate objects, and not create many thousands of objects.

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