Geografic-Information-System/lib/python/pygrass/vector/testsuite/test_geometry.py

# -*- coding: utf-8 -*-
"""
Created on Thu Jun 19 14:13:53 2014

@author: pietro
"""
import sys
import unittest
import numpy as np

from grass.gunittest.case import TestCase
from grass.gunittest.main import test

import grass.lib.vector as libvect

from grass.pygrass.vector import VectorTopo
from grass.pygrass.vector.geometry import Point, Line, Node


class PointTestCase(TestCase):

    def test_empty_init(self):
        """Test Point()"""
        point = Point()
        self.assertEqual(point.gtype, libvect.GV_POINT)
        self.assertEqual(point.x, 0)
        self.assertEqual(point.y, 0)
        self.assertIsNone(point.z)
        self.assertTrue(point.is2D)

    def test_init_3d(self):
        """Test 3D Point(1, 2, 3)"""
        point = Point(1, 2, 3)
        self.assertEqual(point.x, 1)
        self.assertEqual(point.y, 2)
        self.assertEqual(point.z, 3)
        self.assertFalse(point.is2D)

    def test_switch_2D_3D_2D(self):
        """Test switch between: 2D => 3D => 2D"""
        point = Point()
        self.assertIsNone(point.z)
        self.assertTrue(point.is2D)
        point.z = 1
        self.assertFalse(point.is2D)
        point.z = None
        self.assertTrue(point.is2D, True)

    def test_coords(self):
        """Test coords method"""
        self.assertEqual(Point(1, 2).coords(), (1, 2))
        self.assertEqual(Point(1, 2, 3).coords(), (1, 2, 3))

    def test_get_wkt(self):
        """Test coords method"""
        self.assertEqual(Point(1, 2).get_wkt(), 'POINT(1.000000 2.000000)')
        self.assertEqual(Point(1, 2, 3).get_wkt(),
                         'POINT(1.000000 2.000000 3.000000)')

    def test_distance(self):
        """Test distance method"""
        point0 = Point(0, 0, 0)
        point1 = Point(1, 0)
        self.assertEqual(point0.distance(point1), 1.0)
        point1.z = 1
        self.assertAlmostEqual(point0.distance(point1), np.sqrt(2.))

    def test_eq(self):
        """Test __eq__"""
        point0 = Point(0, 0)
        point1 = Point(1, 0)
        self.assertFalse(point0 == point1)
        self.assertFalse(point0 == (1, 0))
        self.assertTrue(point0 == point0)
        self.assertTrue(point0 == (0, 0))

    def test_repr(self):
        """Test __eq__"""
        self.assertEqual(repr(Point(1, 2)), 'Point(1.000000, 2.000000)')
        self.assertEqual(repr(Point(1, 2, 3)),
                         'Point(1.000000, 2.000000, 3.000000)')

    @unittest.skip("Not implemented yet.")
    def test_buffer(self):
        """Test buffer method"""
        # TODO: verify if the buffer depends from the mapset's projection
        pass


class LineTestCase(TestCase):

    def test_len(self):
        """Test __len__ magic method"""
        self.assertEqual(len(Line()), 0)
        self.assertEqual(len(Line([(0, 0), (1, 1)])), 2)

    @unittest.skipIf(sys.version_info[:2] < (2, 7), "Require Python >= 2.7")
    def test_getitem(self):
        """Test __getitem__ magic method"""
        line = Line([(0, 0), (1, 1), (2, 2), (3, 3), (4, 4)])
        self.assertTupleEqual(line[0].coords(), (0, 0))
        self.assertTupleEqual(line[1].coords(), (1, 1))
        self.assertTupleEqual(line[-2].coords(), (3, 3))
        self.assertTupleEqual(line[-1].coords(), (4, 4))
        self.assertListEqual([p.coords() for p in line[:2]], [(0, 0), (1, 1)])
        self.assertListEqual([p.coords() for p in line[::2]],
                             [(0, 0), (2, 2), (4, 4)])
        with self.assertRaises(IndexError):
            line[5]

    @unittest.skipIf(sys.version_info[:2] < (2, 7), "Require Python >= 2.7")
    def test_setitem(self):
        """Test __setitem__ magic method"""
        line = Line([(0, 0), (1, 1)])
        self.assertTupleEqual(line[0].coords(), (0., 0.))
        line[0] = (10, 10)
        self.assertTupleEqual(line[0].coords(), (10., 10.))

    @unittest.skipIf(sys.version_info[:2] < (2, 7), "Require Python >= 2.7")
    def test_get_pnt(self):
        """Test get_pnt method"""
        line = Line([(0, 0), (1, 1)])
        with self.assertRaises(ValueError):
            line.get_pnt(5)
        vals = (0.7071067811865475, 0.7071067811865475)
        self.assertTupleEqual(line.get_pnt(1).coords(), vals)

    def test_bbox(self):
        """Test bbox method"""
        line = Line([(0, 10), (0, 11), (1, 11), (1, 10)])
        bbox = line.bbox()
        self.assertEqual(11, bbox.north)
        self.assertEqual(10, bbox.south)
        self.assertEqual(1, bbox.east)
        self.assertEqual(0, bbox.west)

    def test_nodes(self):
        """Test inodes method"""
        def nodes2tuple(nodes):
            """Convert an iterable of nodes to a tuple of nodes id"""
            return tuple(n.id for n in nodes)

        with VectorTopo("roadsmajor", mode='r') as vect:
            self.assertTupleEqual((206, 172), nodes2tuple(vect[284].nodes()))
            self.assertTupleEqual((208, 206), nodes2tuple(vect[287].nodes()))
            self.assertTupleEqual((206, 209), nodes2tuple(vect[288].nodes()))
            self.assertTupleEqual((218, 206), nodes2tuple(vect[301].nodes()))



class NodeTestCase(TestCase):
    @classmethod
    def setUpClass(cls):
        cls.vect = None
        cls.vect = VectorTopo("roadsmajor")
        cls.vect.open('r')
        cls.c_mapinfo = cls.vect.c_mapinfo

    @classmethod
    def tearDownClass(cls):
        if cls.vect is not None:
            cls.vect.close()
            cls.c_mapinfo = None

    def test_init(self):
        """Test Node __init__"""
        node = Node(v_id=206, c_mapinfo=self.c_mapinfo)
        self.assertEqual(206, node.id)
        self.assertTrue(node.is2D)
        self.assertEqual(4, node.nlines)

    def test_coords(self):
        """Test Node coordinates"""
        node = Node(v_id=206, c_mapinfo=self.c_mapinfo)
        self.assertTupleEqual((620906.5786131569, 221685.65913128198),
                              node.coords())

    def test_ilines(self):
        """Test Node coordinates"""
        node = Node(v_id=206, c_mapinfo=self.c_mapinfo)
        self.assertTupleEqual((288, -301, -287, 284), tuple(node.ilines()))
        self.assertTupleEqual((-301, -287), tuple(node.ilines(only_in=True)))
        self.assertTupleEqual((288, 284), tuple(node.ilines(only_out=True)))

    def test_angles(self):
        """Test Node angles"""
        node = Node(v_id=206, c_mapinfo=self.c_mapinfo)
        angles = (-3.044905185699463, -1.026218056678772,
                  0.10362745821475983, 2.2236430644989014)
        self.assertTupleEqual(angles, tuple(node.angles()))

if __name__ == '__main__':
    test()