tclgeomap(n) Tcl Extensions tclgeomap(n)NAME
tclgeomap_procs, latitude, longitude, latlon, circle, fillsegment,
grid_list, ocean_list - supplementary procedures for tclgeomap.
VERSION
2
SYNOPSIS
package require tclgeomap_procs ?2?
geomap::latitude geoPt
geomap::longitude geoPt
geomap::latlon geoPt
geomap::prt_time time year month day hour minute second
geomap::circle center radius {unit gsdeg}
geomap::fillsegment p1 p2 {d 2.0}
geomap::grid_list {s 15.0}
geomap::ocean_list {s 15.0}
geomap::projections
geomap::proj_info proj_name
DESCRIPTION
The tclgeomap package provides procedures to use with the tclgeomap.
COMMANDS
geomap::latitude geoPt
This convenience procedure returns the latitude member of geoPt,
which should be a list of form {lat lon}.
geomap::longitude geoPt
This convenience procedure returns the longitude member of
geoPt, which should be a list of form {lat lon}.
geomap::latlon geoPt
This procedure returns the geographic point corresponding to
geoPt. If geoPt is a {latitude longitude} value, the procedure
merely returns it. If geoPt is a location given in degrees,
minutes, seconds format, it returns the corresponding decimal
representation. Otherwise the procedure raises an error.
geomap::prt_time time year month day hour minute second
This procedures takes time value time, which should be a list of
form {year month day hour minute second} and puts the elements
into variables named year month day hour minute second.
geomap::circle center radius {unit gsdeg}
This procedure returns a list of geographic points that define a
circle about geographic point center with radius radius.
Optional unit unit should be a unit value known to the geoplace
step command.
geomap::fillsegment p1 p2 {d 2.0}
This procedure returns a list of geographic points on the great
circle connecting geographic points p1 and p2 that are not fur‐
ther than d great circle degrees apart. This can be useful for
defining long segments that will assume the correct shape in
various map projections.
geomap::grid_list {s 15.0}
This procedure returns a list of grid lines that cover the
Earth. The returned list is in a format intelligible to the
geolinearray fmlist ... command. Spacing s gives the rectangle
size in degrees.
geomap::ocean_list {s 15.0}
This procedure returns a list of closed rectangles that cover
the Earth. The returned list is in a format intelligible to the
geolinearray fmlist ... command. The outlines can be useful for
initializing the globe with a solid color (like blue) and then
drawing land features on top. Spacing s gives the rectangle
size in degrees.
geomap::projections
Returns a list of known projections.
geomap::proj_info proj_name
Returns a list of form {reference domain}, where reference is
the type of reference projection proj_name uses, either point or
longitude, and domain is how much of the Earth projection
proj_name transforms, either globe or hemisphere.
FILES
These procedures are part of the tclgeomap_procs package, which is
defined in file tclgeomap_procs.tcl of the tkgeomap installation.
AUTHOR
Gordon Carrie <user0@tkgeomap.org>
Tk 2 tclgeomap(n)
