def test_delta_below_zero():
"""Test line align constraint with delta below zero.
"""
line = (Variable(0), Variable(0)), (Variable(30), Variable(20))
point = (Variable(15), Variable(10))
lc = LineAlignConstraint(line=line, point=point, align=0.5, delta=-5)
lc.solve_for()
assert round(abs(10.84 - point[0].value), 2) == 0
assert round(abs(7.23 - point[1].value), 2) == 0
line[1][0].value = 40
line[1][1].value = 30
lc.solve_for()
assert round(abs(16.0 - point[0].value), 2) == 0
assert round(abs(12.00 - point[1].value), 2) == 0
def test_delta():
"""Test line align constraint delta.
"""
line = (Variable(0), Variable(0)), (Variable(30), Variable(20))
point = (Variable(15), Variable(10))
lc = LineAlignConstraint(line=line, point=point, align=0.5, delta=5)
lc.solve_for()
assert round(abs(19.16 - point[0].value), 2) == 0
assert round(abs(12.77 - point[1].value), 2) == 0
line[1][0].value = 40
line[1][1].value = 30
lc.solve_for()
assert round(abs(24.00 - point[0].value), 2) == 0
assert round(abs(18.00 - point[1].value), 2) == 0
def constraint(self, canvas, item, handle, glue_item):
"""Create connection line constraint between item's handle and the
port."""
line = canvas.project(glue_item, self.start, self.end)
point = canvas.project(item, handle.pos)
x, y = canvas.get_matrix_i2c(item).transform_point(*handle.pos)
x, y = canvas.get_matrix_c2i(glue_item).transform_point(x, y)
# keep message at the same distance from head or bottom of lifetime
# line depending on situation
height = self.end.y - self.start.y
if y / height < 0.5:
delta = y - self.start.y
align = 0
else:
delta = y - self.end.y
align = 1
return LineAlignConstraint(line, point, align, delta)
def test_delta_below_zero():
"""Test line align constraint with delta below zero."""
line = (Variable(0), Variable(0)), (Variable(30), Variable(20))
point = (Variable(15), Variable(10))
lc = LineAlignConstraint(line=line, point=point, align=0.5, delta=-5)
lc.solve_for()
assert round(abs(10.84 - point[0].value), 2) == 0
assert round(abs(7.23 - point[1].value), 2) == 0
line[1][0].value = 40
line[1][1].value = 30
lc.solve_for()
assert round(abs(16.0 - point[0].value), 2) == 0
assert round(abs(12.00 - point[1].value), 2) == 0
def test_delta():
"""Test line align constraint delta."""
line = (Variable(0), Variable(0)), (Variable(30), Variable(20))
point = (Variable(15), Variable(10))
lc = LineAlignConstraint(line=line, point=point, align=0.5, delta=5)
lc.solve_for()
assert round(abs(19.16 - point[0].value), 2) == 0
assert round(abs(12.77 - point[1].value), 2) == 0
line[1][0].value = 40
line[1][1].value = 30
lc.solve_for()
assert round(abs(24.00 - point[0].value), 2) == 0
assert round(abs(18.00 - point[1].value), 2) == 0
def test_delta_below_zero(self):
"""Test line align with delta below zero
"""
line = (Variable(0), Variable(0)), (Variable(30), Variable(20))
point = (Variable(15), Variable(10))
lc = LineAlignConstraint(line=line, point=point, align=0.5, delta=-5)
lc.solve_for()
self.assertAlmostEqual(10.84, point[0].value, 2)
self.assertAlmostEqual(7.23, point[1].value, 2)
line[1][0].value = 40
line[1][1].value = 30
lc.solve_for()
self.assertAlmostEqual(16.0, point[0].value, 2)
self.assertAlmostEqual(12.00, point[1].value, 2)
def test_delta(self):
"""Test line align delta
"""
line = (Variable(0), Variable(0)), (Variable(30), Variable(20))
point = (Variable(15), Variable(10))
lc = LineAlignConstraint(line=line, point=point, align=0.5, delta=5)
lc.solve_for()
self.assertAlmostEqual(19.16, point[0].value, 2)
self.assertAlmostEqual(12.77, point[1].value, 2)
line[1][0].value = 40
line[1][1].value = 30
lc.solve_for()
self.assertAlmostEqual(24.00, point[0].value, 2)
self.assertAlmostEqual(18.00, point[1].value, 2)
def constraint(self, item, handle, glue_item):
"""Create connection line constraint between item's handle and the
port."""
start = MatrixProjection(self.start, glue_item.matrix_i2c)
end = MatrixProjection(self.end, glue_item.matrix_i2c)
point = MatrixProjection(handle.pos, item.matrix_i2c)
x, y = item.matrix_i2c.transform_point(*handle.pos)
x, y = glue_item.matrix_i2c.inverse().transform_point(x, y)
# keep message at the same distance from head or bottom of lifetime
# line depending on situation
height = self.end.y - self.start.y
if y / height < 0.5:
delta = y - self.start.y
align = 0
else:
delta = y - self.end.y
align = 1
line = LineAlignConstraint((start, end), point, align, delta)
return MultiConstraint(start, end, point, line)
def constraint(
self,
horizontal=None,
vertical=None,
left_of=None,
above=None,
line=None,
delta=0.0,
align=None,
):
"""
Utility (factory) method to create item's internal constraint
between two positions or between a position and a line.
Position is a tuple of coordinates, i.e. ``(2, 4)``.
Line is a tuple of positions, i.e. ``((2, 3), (4, 2))``.
This method shall not be used to create constraints between
two different items.
Created constraint is returned.
:Parameters:
horizontal=(p1, p2)
Keep positions ``p1`` and ``p2`` aligned horizontally.
vertical=(p1, p2)
Keep positions ``p1`` and ``p2`` aligned vertically.
left_of=(p1, p2)
Keep position ``p1`` on the left side of position ``p2``.
above=(p1, p2)
Keep position ``p1`` above position ``p2``.
line=(p, l)
Keep position ``p`` on line ``l``.
"""
cc = None # created constraint
if horizontal:
p1, p2 = horizontal
cc = EqualsConstraint(p1[1], p2[1], delta)
elif vertical:
p1, p2 = vertical
cc = EqualsConstraint(p1[0], p2[0], delta)
elif left_of:
p1, p2 = left_of
cc = LessThanConstraint(p1[0], p2[0], delta)
elif above:
p1, p2 = above
cc = LessThanConstraint(p1[1], p2[1], delta)
elif line:
pos, l = line
if align is None:
cc = LineConstraint(line=l, point=pos)
else:
cc = LineAlignConstraint(line=l,
point=pos,
align=align,
delta=delta)
else:
raise ValueError("Constraint incorrectly specified")
assert cc is not None
self._constraints.append(cc)
return cc
