projectmap(map, height [, hdist=hdist,
angle=angle, mag=mag, xmap=xmap, ymap=ymap,
Returns a projected version of the two-dimensional
which must be a numerical array. The eye is
above the map, measured in units of one map element (as are all linear
measurements in the argument list). The returned array has the same
data type as
map. By default, the returned array has 512
by 512 elements and shows the central
height elements of
hdist, which defaults to 0, indicates the horizontal
distance of the eye from the chosen center of the projection.
angle, which defaults to 0, indicates the direction of the
horizontal displacement of the eye, such that an angle of zero yields
the same orientation as
tv,map, and an increase of the
angle leads to a clockwise rotation of the projection.
mag, which defaults to 1, indicates the linear
magnification factor. A greater
mag leads to a smaller
fraction of the map being visible in the result.
ymap indicate the map coordinates of the chosen center of
the projection. This location defaults to the center of the map, i.e.,
size, which defaults to 512,
indicates the linear size of the array that is returned. If
size is a scalar, then its value is taken for both
dimensions. If it is an array, then the first two of its elements are
taken for the dimensions. If
hdist is zero, then the
greatest dimension of the output array spans
height/mag elements of the map.