238 lines
9.6 KiB
Python
238 lines
9.6 KiB
Python
"""Tests related to SVG groups.
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To run these tests, you can use (from root svgpathtools directory):
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$ python -m unittest test.test_groups.TestGroups.test_group_flatten
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"""
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from __future__ import division, absolute_import, print_function
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import unittest
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from svgpathtools import *
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from os.path import join, dirname
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import numpy as np
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def get_desired_path(name, paths):
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return next(p for p in paths
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if p.element.get('{some://testuri}name') == name)
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class TestGroups(unittest.TestCase):
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def check_values(self, v, z):
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# Check that the components of 2D vector v match the components
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# of complex number z
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self.assertAlmostEqual(v[0], z.real)
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self.assertAlmostEqual(v[1], z.imag)
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def check_line(self, tf, v_s_vals, v_e_relative_vals, name, paths):
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# Check that the endpoints of the line have been correctly transformed.
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# * tf is the transform that should have been applied.
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# * v_s_vals is a 2D list of the values of the line's start point
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# * v_e_relative_vals is a 2D list of the values of the line's
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# end point relative to the start point
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# * name is the path name (value of the test:name attribute in
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# the SVG document)
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# * paths is the output of doc.paths()
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v_s_vals.append(1.0)
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v_e_relative_vals.append(0.0)
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v_s = np.array(v_s_vals)
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v_e = v_s + v_e_relative_vals
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actual = get_desired_path(name, paths)
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self.check_values(tf.dot(v_s), actual.start)
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self.check_values(tf.dot(v_e), actual.end)
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def test_group_flatten(self):
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# Test the Document.paths() function against the
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# groups.svg test file.
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# There are 12 paths in that file, with various levels of being
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# nested inside of group transforms.
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# The check_line function is used to reduce the boilerplate,
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# since all the tests are very similar.
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# This test covers each of the different types of transforms
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# that are specified by the SVG standard.
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doc = Document(join(dirname(__file__), 'groups.svg'))
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result = doc.paths()
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self.assertEqual(12, len(result))
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tf_matrix_group = np.array([[1.5, 0.0, -40.0],
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[0.0, 0.5, 20.0],
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[0.0, 0.0, 1.0]])
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self.check_line(tf_matrix_group,
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[183, 183], [0.0, -50],
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'path00', result)
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tf_scale_group = np.array([[1.25, 0.0, 0.0],
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[0.0, 1.25, 0.0],
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[0.0, 0.0, 1.0]])
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self.check_line(tf_matrix_group.dot(tf_scale_group),
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[122, 320], [-50.0, 0.0],
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'path01', result)
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self.check_line(tf_matrix_group.dot(tf_scale_group),
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[150, 200], [-50, 25],
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'path02', result)
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self.check_line(tf_matrix_group.dot(tf_scale_group),
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[150, 200], [-50, 25],
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'path03', result)
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tf_nested_translate_group = np.array([[1, 0, 20],
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[0, 1, 0],
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[0, 0, 1]])
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self.check_line(tf_matrix_group.dot(tf_scale_group
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).dot(tf_nested_translate_group),
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[150, 200], [-50, 25],
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'path04', result)
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tf_nested_translate_xy_group = np.array([[1, 0, 20],
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[0, 1, 30],
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[0, 0, 1]])
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self.check_line(tf_matrix_group.dot(tf_scale_group
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).dot(tf_nested_translate_xy_group),
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[150, 200], [-50, 25],
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'path05', result)
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tf_scale_xy_group = np.array([[0.5, 0, 0],
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[0, 1.5, 0.0],
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[0, 0, 1]])
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self.check_line(tf_matrix_group.dot(tf_scale_xy_group),
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[122, 320], [-50, 0],
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'path06', result)
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a_07 = 20.0*np.pi/180.0
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tf_rotate_group = np.array([[np.cos(a_07), -np.sin(a_07), 0],
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[np.sin(a_07), np.cos(a_07), 0],
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[0, 0, 1]])
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self.check_line(tf_matrix_group.dot(tf_rotate_group),
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[183, 183], [0, 30],
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'path07', result)
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a_08 = 45.0*np.pi/180.0
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tf_rotate_xy_group_R = np.array([[np.cos(a_08), -np.sin(a_08), 0],
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[np.sin(a_08), np.cos(a_08), 0],
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[0, 0, 1]])
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tf_rotate_xy_group_T = np.array([[1, 0, 183],
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[0, 1, 183],
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[0, 0, 1]])
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tf_rotate_xy_group = tf_rotate_xy_group_T.dot(
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tf_rotate_xy_group_R).dot(
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np.linalg.inv(tf_rotate_xy_group_T))
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self.check_line(tf_matrix_group.dot(tf_rotate_xy_group),
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[183, 183], [0, 30],
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'path08', result)
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a_09 = 5.0*np.pi/180.0
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tf_skew_x_group = np.array([[1, np.tan(a_09), 0],
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[0, 1, 0],
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[0, 0, 1]])
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self.check_line(tf_matrix_group.dot(tf_skew_x_group),
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[183, 183], [40, 40],
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'path09', result)
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a_10 = 5.0*np.pi/180.0
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tf_skew_y_group = np.array([[1, 0, 0],
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[np.tan(a_10), 1, 0],
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[0, 0, 1]])
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self.check_line(tf_matrix_group.dot(tf_skew_y_group),
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[183, 183], [40, 40],
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'path10', result)
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# This last test is for handling transforms that are defined as
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# attributes of a <path> element.
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a_11 = -40*np.pi/180.0
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tf_path11_R = np.array([[np.cos(a_11), -np.sin(a_11), 0],
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[np.sin(a_11), np.cos(a_11), 0],
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[0, 0, 1]])
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tf_path11_T = np.array([[1, 0, 100],
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[0, 1, 100],
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[0, 0, 1]])
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tf_path11 = tf_path11_T.dot(tf_path11_R).dot(np.linalg.inv(tf_path11_T))
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self.check_line(tf_matrix_group.dot(tf_skew_y_group).dot(tf_path11),
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[180, 20], [-70, 80],
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'path11', result)
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def check_group_count(self, doc, expected_count):
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count = 0
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for _ in doc.tree.getroot().iter('{{{0}}}g'.format(SVG_NAMESPACE['svg'])):
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count += 1
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self.assertEqual(expected_count, count)
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def test_nested_group(self):
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# A bug in the flattened_paths_from_group() implementation made it so that only top-level
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# groups could have their paths flattened. This is a regression test to make
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# sure that when a nested group is requested, its paths can also be flattened.
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doc = Document(join(dirname(__file__), 'groups.svg'))
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result = doc.paths_from_group(['matrix group', 'scale group'])
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self.assertEqual(len(result), 5)
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def test_add_group(self):
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# Test `Document.add_group()` function and related Document functions.
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doc = Document(None)
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self.check_group_count(doc, 0)
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base_group = doc.add_group()
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base_group.set('id', 'base_group')
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self.assertTrue(doc.contains_group(base_group))
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self.check_group_count(doc, 1)
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child_group = doc.add_group(parent=base_group)
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child_group.set('id', 'child_group')
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self.assertTrue(doc.contains_group(child_group))
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self.check_group_count(doc, 2)
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grandchild_group = doc.add_group(parent=child_group)
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grandchild_group.set('id', 'grandchild_group')
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self.assertTrue(doc.contains_group(grandchild_group))
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self.check_group_count(doc, 3)
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sibling_group = doc.add_group(parent=base_group)
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sibling_group.set('id', 'sibling_group')
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self.assertTrue(doc.contains_group(sibling_group))
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self.check_group_count(doc, 4)
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# Test that we can retrieve each new group from the document
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self.assertEqual(base_group, doc.get_or_add_group(['base_group']))
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self.assertEqual(child_group, doc.get_or_add_group(
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['base_group', 'child_group']))
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self.assertEqual(grandchild_group, doc.get_or_add_group(
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['base_group', 'child_group', 'grandchild_group']))
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self.assertEqual(sibling_group, doc.get_or_add_group(
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['base_group', 'sibling_group']))
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# Create a new nested group
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new_child = doc.get_or_add_group(
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['base_group', 'new_parent', 'new_child'])
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self.check_group_count(doc, 6)
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self.assertEqual(new_child, doc.get_or_add_group(
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['base_group', 'new_parent', 'new_child']))
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new_leaf = doc.get_or_add_group(
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['base_group', 'new_parent', 'new_child', 'new_leaf'])
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self.assertEqual(new_leaf, doc.get_or_add_group([
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'base_group', 'new_parent', 'new_child', 'new_leaf']))
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self.check_group_count(doc, 7)
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path_d = ('M 206.07112,858.41289 L 206.07112,-2.02031 '
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'C -50.738,-81.14814 -20.36402,-105.87055 52.52793,-101.01525 '
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'L 103.03556,0.0 '
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'L 0.0,111.11678')
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svg_path = doc.add_path(path_d, group=new_leaf)
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self.assertEqual(path_d, svg_path.get('d'))
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path = parse_path(path_d)
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svg_path = doc.add_path(path, group=new_leaf)
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self.assertEqual(path_d, svg_path.get('d')) |