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SYNOPSIS
USAGE
gcontour(img, levels, &callback_fun [, callback_args...]);
DESCRIPTION
`img' is a 2d-array of numbers, `levels' is an array of contour-levels,
and `callback_fun' is a callback function that will be called as
callback_fun(x, y, iz [, callback_args...]);
for each contour line at the level `levels[iz]'
with the image coordinates `x' and `y'.
SEE ALSO
gcontour_compute
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gcontour_compute
USAGE
Struct_Type[] gcontour_compute(img, levels)
DESCRIPTION
This function takes a 2d array of numbers (`img') and an array of
array of N contour-levels (`levels') and returns the
corresponding contours in the form of an array of N structures.
Each structure contains the contour lines for the corresponding level
via the fields `x_list' and `y_list'.
As the names indicate, the values of these fields are lists. Each
element of the x_list contains the image x coordinate of the
contour. Similarly each element of the y_list field is an array of
image y coordinates.
SEE ALSO
gcontour
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