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trackg

Great circle or rhumb line defined via mouse input

Syntax

h = trackg(ntrax)
h = trackg(ntrax,npts)
h = trackg(ntrax,linestyle)
h = trackg(ntrax,PropertyName,PropertyValue,...)
[lat,lon] = trackg(ntrax,npts,...)
h = trackg(track,ntrax,...)

Description

h = trackg(ntrax) brings forward the current map axes and waits for the user to make (2 x ntrax) mouse clicks. The output h is a vector of handles for the ntrax track segments, which are then displayed.

h = trackg(ntrax,npts) specifies the number of plotting points to be used for each track segment. npts is 100 by default.

h = trackg(ntrax,linestyle) specifies the line style for the displayed track segments, where linestyle is any line style string recognized by the standard MATLAB® line function.

h = trackg(ntrax,PropertyName,PropertyValue,...) allows property name/property value pairs to be set, where PropertyName and PropertyValue are recognized by the line function.

[lat,lon] = trackg(ntrax,npts,...) returns the coordinates of the plotted points rather than the handles of the track segments. Successive segments are stored in separate columns of lat and lon.

h = trackg(track,ntrax,...) specifies the logic with which tracks are calculated. If the string track is 'gc' (the default), a great circle path is used. If track is 'rh', rhumb line logic is used.

This function is used to define great circles or rhumb lines for display using mouse clicks. For each track, two clicks are required, one for each endpoint of the desired track segment. You can modify the track after creation by Shift+clicking it. The track is then in edit mode, during which you can change the length and position by dragging control points, or by entering values into a control panel. Shift+clicking again exits edit mode.

See Also

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