trackg
Great circle or rhumb line defined via mouse input
Syntax
h = trackg(ntrax)
h = trackg(ntrax,npts)
h = trackg(ntrax,LineSpec)
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,LineSpec)
specifies the line style,
marker, and color.
h = trackg(ntrax,
allows
property name/property value pairs to be set, where PropertyName
,PropertyValue,...)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(
specifies
the logic with which tracks are calculated. If track
,ntrax,...)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.