[qu2cu] Add pen tests
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Behdad Esfahbod
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3534b59631
213
Tests/pens/qu2cuPen_test.py
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213
Tests/pens/qu2cuPen_test.py
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# Copyright 2016 Google Inc. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import sys
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import unittest
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from fontTools.pens.qu2cuPen import Qu2CuPen
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from fontTools.pens.recordingPen import RecordingPen
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from . import CUBIC_GLYPHS, QUAD_GLYPHS
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from .utils import DummyGlyph
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from .utils import DummyPen
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from textwrap import dedent
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MAX_ERR = 1.0
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class _TestPenMixin(object):
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"""Collection of tests that are shared by both the SegmentPen and the
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PointPen test cases, plus some helper methods.
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Note: We currently don't have a PointPen.
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"""
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maxDiff = None
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def diff(self, expected, actual):
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import difflib
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expected = str(self.Glyph(expected)).splitlines(True)
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actual = str(self.Glyph(actual)).splitlines(True)
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diff = difflib.unified_diff(
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expected, actual, fromfile="expected", tofile="actual"
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)
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return "".join(diff)
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def convert_glyph(self, glyph, **kwargs):
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# draw source glyph onto a new glyph using a Cu2Qu pen and return it
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converted = self.Glyph()
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pen = getattr(converted, self.pen_getter_name)()
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cubicpen = self.Qu2CuPen(pen, MAX_ERR, **kwargs)
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getattr(glyph, self.draw_method_name)(cubicpen)
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return converted
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def expect_glyph(self, source, expected):
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converted = self.convert_glyph(source)
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self.assertNotEqual(converted, source)
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if not converted.approx(expected):
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print(self.diff(expected, converted))
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self.fail("converted glyph is different from expected")
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def test_convert_simple_glyph(self):
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self.expect_glyph(QUAD_GLYPHS["a"], CUBIC_GLYPHS["a"])
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self.expect_glyph(QUAD_GLYPHS["A"], CUBIC_GLYPHS["A"])
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def test_convert_composite_glyph(self):
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source = CUBIC_GLYPHS["Aacute"]
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converted = self.convert_glyph(source)
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# components don't change after quadratic conversion
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self.assertEqual(converted, source)
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def test_reverse_direction(self):
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for name in ("a", "A", "Eacute"):
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source = QUAD_GLYPHS[name]
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normal_glyph = self.convert_glyph(source)
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reversed_glyph = self.convert_glyph(source, reverse_direction=True)
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# the number of commands is the same, just their order is iverted
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self.assertTrue(len(normal_glyph.outline), len(reversed_glyph.outline))
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self.assertNotEqual(normal_glyph, reversed_glyph)
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def test_stats(self):
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stats = {}
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for name in QUAD_GLYPHS.keys():
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source = QUAD_GLYPHS[name]
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self.convert_glyph(source, stats=stats)
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self.assertTrue(stats)
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self.assertTrue("1" in stats)
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self.assertEqual(type(stats["1"]), int)
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def test_addComponent(self):
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pen = self.Pen()
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cubicpen = self.Qu2CuPen(pen, MAX_ERR)
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cubicpen.addComponent("a", (1, 2, 3, 4, 5.0, 6.0))
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# components are passed through without changes
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self.assertEqual(
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str(pen).splitlines(),
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[
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"pen.addComponent('a', (1, 2, 3, 4, 5.0, 6.0))",
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],
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)
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class TestQu2CuPen(unittest.TestCase, _TestPenMixin):
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def __init__(self, *args, **kwargs):
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super(TestQu2CuPen, self).__init__(*args, **kwargs)
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self.Glyph = DummyGlyph
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self.Pen = DummyPen
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self.Qu2CuPen = Qu2CuPen
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self.pen_getter_name = "getPen"
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self.draw_method_name = "draw"
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def test_qCurveTo_1_point(self):
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pen = DummyPen()
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cubicpen = Qu2CuPen(pen, MAX_ERR)
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cubicpen.moveTo((0, 0))
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cubicpen.qCurveTo((1, 1))
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cubicpen.closePath()
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self.assertEqual(
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str(pen).splitlines(),
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[
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"pen.moveTo((0, 0))",
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"pen.qCurveTo((1, 1))",
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"pen.closePath()",
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],
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)
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def test_qCurveTo_2_points(self):
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pen = DummyPen()
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cubicpen = Qu2CuPen(pen, MAX_ERR)
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cubicpen.moveTo((0, 0))
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cubicpen.qCurveTo((1, 1), (2, 2))
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cubicpen.closePath()
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self.assertEqual(
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str(pen).splitlines(),
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[
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"pen.moveTo((0, 0))",
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"pen.qCurveTo((1, 1), (2, 2))",
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"pen.closePath()",
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],
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)
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def test_qCurveTo_3_points(self):
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pen = DummyPen()
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cubicpen = Qu2CuPen(pen, MAX_ERR)
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cubicpen.moveTo((0, 0))
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cubicpen.qCurveTo((0, 3), (1, 3), (1, 0))
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cubicpen.closePath()
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self.assertEqual(
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str(pen).splitlines(),
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[
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"pen.moveTo((0, 0))",
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"pen.curveTo((0, 4.0), (1, 4.0), (1, 0))",
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"pen.closePath()",
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],
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)
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def test_curveTo_1_point(self):
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pen = DummyPen()
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cubicpen = Qu2CuPen(pen, MAX_ERR)
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cubicpen.moveTo((0, 0))
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cubicpen.curveTo((1, 1))
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cubicpen.closePath()
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self.assertEqual(
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str(pen).splitlines(),
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[
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"pen.moveTo((0, 0))",
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"pen.curveTo((1, 1))",
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"pen.closePath()",
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],
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)
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def test_curveTo_2_points(self):
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pen = DummyPen()
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cubicpen = Qu2CuPen(pen, MAX_ERR)
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cubicpen.moveTo((0, 0))
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cubicpen.curveTo((1, 1), (2, 2))
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cubicpen.closePath()
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self.assertEqual(
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str(pen).splitlines(),
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[
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"pen.moveTo((0, 0))",
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"pen.curveTo((1, 1), (2, 2))",
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"pen.closePath()",
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],
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)
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def test_curveTo_3_points(self):
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pen = DummyPen()
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cubicpen = Qu2CuPen(pen, MAX_ERR)
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cubicpen.moveTo((0, 0))
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cubicpen.curveTo((1, 1), (2, 2), (3, 3))
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cubicpen.closePath()
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self.assertEqual(
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str(pen).splitlines(),
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[
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"pen.moveTo((0, 0))",
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"pen.curveTo((1, 1), (2, 2), (3, 3))",
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"pen.closePath()",
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],
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)
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if __name__ == "__main__":
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unittest.main()
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