Python Ctypes Examples

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Revision as of 18:58, 20 January 2011 by Landa (talk | contribs) (Created page with "== Accessing geometry == This script switches X, Y coordinates and multiple them by -1. <source lang="python"> import sys import grass.script as grass from grass.lib.vector i...")
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Accessing geometry

This script switches X, Y coordinates and multiple them by -1.

import sys

import grass.script as grass

from grass.lib.vector import *

if len(sys.argv) < 2:
    sys.exit("Usage: %s: vector" % sys.argv[0])

name = sys.argv[1]

map_info = pointer(Map_info())
points = Vect_new_line_struct()
cats = Vect_new_cats_struct()
c_points = points.contents

level = Vect_open_update(map_info, name, "")
if level < 2:
    sys.exit("Topology not available")

nlines = Vect_get_num_lines(map_info)

for line in range(1, nlines):
    ltype = Vect_read_line(map_info, points, cats, line)
    if line % 100 == 0:
        sys.stderr.write("\r%d" % line)
    
    for i in range(c_points.n_points):
        x = c_points.x[i]
        c_points.x[i] = -1 * c_points.y[i]
        c_points.y[i] = -1 * x
    
    Vect_rewrite_line(map_info, line, ltype,
                      points, cats)
    line += 1

Vect_destroy_line_struct(points)
Vect_destroy_cats_struct(cats)

Vect_close(map_info)