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Filename : test_transforms.py

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from nose.tools import assert_equal
from numpy.testing import assert_almost_equal
from matplotlib.transforms import Affine2D
import numpy as np

def test_Affine2D_from_values():
    points = [ [0,0],
               [10,20],
               [-1,0],
               ]

    t = Affine2D.from_values(1,0,0,0,0,0)
    actual = t.transform(points)
    expected = np.array( [[0,0],[10,0],[-1,0]] )
    assert_almost_equal(actual,expected)

    t = Affine2D.from_values(0,2,0,0,0,0)
    actual = t.transform(points)
    expected = np.array( [[0,0],[0,20],[0,-2]] )
    assert_almost_equal(actual,expected)

    t = Affine2D.from_values(0,0,3,0,0,0)
    actual = t.transform(points)
    expected = np.array( [[0,0],[60,0],[0,0]] )
    assert_almost_equal(actual,expected)

    t = Affine2D.from_values(0,0,0,4,0,0)
    actual = t.transform(points)
    expected = np.array( [[0,0],[0,80],[0,0]] )
    assert_almost_equal(actual,expected)

    t = Affine2D.from_values(0,0,0,0,5,0)
    actual = t.transform(points)
    expected = np.array( [[5,0],[5,0],[5,0]] )
    assert_almost_equal(actual,expected)

    t = Affine2D.from_values(0,0,0,0,0,6)
    actual = t.transform(points)
    expected = np.array( [[0,6],[0,6],[0,6]] )
    assert_almost_equal(actual,expected)