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rename function to round_start_circle_stable_containment

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as suggested in https://github.com/fonttools/fonttools/pull/2148#discussion_r557656073
This commit is contained in:
Cosimo Lupo 2021-01-15 17:37:11 +00:00
parent 4f1102ac6e
commit b465dcff75
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GPG Key ID: 179A8F0895A02F4F
3 changed files with 9 additions and 10 deletions
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4
Lib/fontTools/colorLib/builder.py
View File

@ -34,7 +34,7 @@ from fontTools.ttLib.tables.otTables import (
VariableInt,
)
from .errors import ColorLibError
from .geometry import nudge_start_circle_almost_inside
from .geometry import round_start_circle_stable_containment
# TODO move type aliases to colorLib.types?
@ -534,7 +534,7 @@ class LayerV1ListBuilder:
r1 = _to_variable_value(r1)
# avoid abrupt change after rounding when c0 is near c1's perimeter
c = nudge_start_circle_almost_inside(
c = round_start_circle_stable_containment(
(x0.value, y0.value), r0.value, (x1.value, y1.value), r1.value
)
x0, y0 = x0._replace(value=c.centre[0]), y0._replace(value=c.centre[1])

4
Lib/fontTools/colorLib/geometry.py
View File

@ -78,8 +78,8 @@ class Circle:
self.centre = _nudge_point(self.centre, direction)
def nudge_start_circle_almost_inside(c0, r0, c1, r1):
"""Nudge c0 so it continues to be inside/outside c1 after rounding.
def round_start_circle_stable_containment(c0, r0, c1, r1):
"""Round start circle so that it stays inside/outside end circle after rounding.
The rounding of circle coordinates to integers may cause an abrupt change
if the start circle c0 is so close to the end circle c1's perimiter that

11
Tests/colorLib/builder_test.py
View File

@ -1,7 +1,7 @@
from fontTools.ttLib import newTable
from fontTools.ttLib.tables import otTables as ot
from fontTools.colorLib import builder
from fontTools.colorLib.geometry import nudge_start_circle_almost_inside, Circle
from fontTools.colorLib.geometry import round_start_circle_stable_containment, Circle
from fontTools.colorLib.builder import LayerV1ListBuilder
from fontTools.colorLib.errors import ColorLibError
import pytest
@ -1066,10 +1066,10 @@ class TrickyRadialGradientTest:
else:
return Circle(c0, r0).inside(Circle(c1, r1))
def nudge_start_circle_position(self, c0, r0, c1, r1, inside=True):
def round_start_circle(self, c0, r0, c1, r1, inside=True):
assert self.circle_inside_circle(c0, r0, c1, r1) is inside
assert self.circle_inside_circle(c0, r0, c1, r1, rounded=True) is not inside
r = nudge_start_circle_almost_inside(c0, r0, c1, r1)
r = round_start_circle_stable_containment(c0, r0, c1, r1)
assert (
self.circle_inside_circle(r.centre, r.radius, c1, r1, rounded=True)
is inside
@ -1082,8 +1082,7 @@ class TrickyRadialGradientTest:
r0 = 0
c1 = (642.99108, 104.70327999999995)
r1 = 260.0072
result = self.nudge_start_circle_position(c0, r0, c1, r1, inside=True)
assert result == ((386, 71), 0)
assert self.round_start_circle(c0, r0, c1, r1, inside=True) == ((386, 71), 0)
@pytest.mark.parametrize(
"c0, r0, c1, r1, inside, expected",
@ -1105,4 +1104,4 @@ class TrickyRadialGradientTest:
],
)
def test_nudge_start_circle_position(self, c0, r0, c1, r1, inside, expected):
assert self.nudge_start_circle_position(c0, r0, c1, r1, inside) == expected
assert self.round_start_circle(c0, r0, c1, r1, inside) == expected