def enlarged(anormpath, enlargeby_pt, round):
newnormsubpaths = []
for normsubpath in anormpath.normsubpaths:
splitnormsubpathitems = normsubpath.normsubpathitems[:] # do splitting on a copy
i = 0
while i < len(splitnormsubpathitems):
if isinstance(splitnormsubpathitems[i], normpath.normcurve_pt) and splitnormsubpathitems[i].arclen_pt(normsubpath.epsilon) > 100:
splitnormsubpathitems[i:i+1] = splitnormsubpathitems[i]._midpointsplit(normsubpath.epsilon)
else:
i += 1
newnormsubpathitems = []
for normsubpathitem in splitnormsubpathitems:
# get old and new start and end points
ts, te = normsubpathitem.trafo([0, 1])
xs, ys = ts.apply_pt(0, 0)
nxs, nys = ts.apply_pt(0, -enlargeby_pt)
xe, ye = te.apply_pt(0, 0)
nxe, nye = te.apply_pt(0, -enlargeby_pt)
if isinstance(normsubpathitem, normpath.normcurve_pt):
# We should do not alter the sign. Could we do any better here?
try:
cs = 1/(normsubpathitem.curveradius_pt([0])[0] + enlargeby_pt)
except ArithmeticError:
cs = 0
try:
ce = 1/(normsubpathitem.curveradius_pt([1])[0] + enlargeby_pt)
except ArithmeticError:
ce = 0
# this should be a function (in path?), not a method in a class
# the parameter convention is quite different from other places ...
bezierparams = deformer.normcurve_from_endgeometry_pt((nxs, nys), (nxe, nye),
(ts.matrix[0][0], ts.matrix[1][0]),
(te.matrix[0][0], te.matrix[1][0]),
cs, ce)
c.fill(path.circle_pt(bezierparams.x0_pt, bezierparams.y0_pt, 1), [color.rgb.blue])
c.fill(path.circle_pt(bezierparams.x3_pt, bezierparams.y3_pt, 1), [color.rgb.blue])
newnormpathitems = normpath.normcurve_pt(bezierparams.x0_pt, bezierparams.y0_pt,
bezierparams.x1_pt, bezierparams.y1_pt,
bezierparams.x2_pt, bezierparams.y2_pt,
bezierparams.x3_pt, bezierparams.y3_pt)
showtangent(newnormpathitems) # line alignment of bezier curves
showcircle(newnormpathitems) # circle alignment of bezier curves
else:
# line
newnormpathitems = path.normline_pt(nxs, nys, nxe, nye)
if len(newnormsubpathitems):
newnormsubpathitems.extend(connect(newnormsubpathitems[-1], newnormpathitems, round=round))
newnormsubpathitems.append(newnormpathitems)
if normsubpath.closed:
newnormsubpathitems.extend(connect(newnormsubpathitems[-1], newnormsubpathitems[0], round=round))
newnormsubpaths.append(path.normsubpath(newnormsubpathitems, normsubpath.closed))
return normpath.normpath(newnormsubpaths)
def enlarged(anormpath, enlargeby_pt, round):
newnormsubpaths = []
for normsubpath in anormpath.normsubpaths:
splitnormsubpathitems = normsubpath.normsubpathitems[:] # do splitting on a copy
i = 0
while i < len(splitnormsubpathitems):
if isinstance(splitnormsubpathitems[i], normpath.normcurve_pt) and splitnormsubpathitems[i].arclen_pt(normsubpath.epsilon) > 100:
splitnormsubpathitems[i:i+1] = splitnormsubpathitems[i]._midpointsplit(normsubpath.epsilon)
else:
i += 1
newnormsubpathitems = []
for normsubpathitem in splitnormsubpathitems:
# get old and new start and end points
ts, te = normsubpathitem.trafo([0, 1])
xs, ys = ts.apply_pt(0, 0)
nxs, nys = ts.apply_pt(0, -enlargeby_pt)
xe, ye = te.apply_pt(0, 0)
nxe, nye = te.apply_pt(0, -enlargeby_pt)
if isinstance(normsubpathitem, normpath.normcurve_pt):
# We should do not alter the sign. Could we do any better here?
try:
cs = 1/(normsubpathitem.curveradius_pt([0])[0] + enlargeby_pt)
except ArithmeticError:
cs = 0
try:
ce = 1/(normsubpathitem.curveradius_pt([1])[0] + enlargeby_pt)
except ArithmeticError:
ce = 0
# this should be a function (in path?), not a method in a class
# the parameter convention is quite different from other places ...
bezierparams = deformer.normcurve_from_endgeometry_pt((nxs, nys), (nxe, nye),
(ts.matrix[0][0], ts.matrix[1][0]),
(te.matrix[0][0], te.matrix[1][0]),
cs, ce)
c.fill(path.circle_pt(bezierparams.x0_pt, bezierparams.y0_pt, 1), [color.rgb.blue])
c.fill(path.circle_pt(bezierparams.x3_pt, bezierparams.y3_pt, 1), [color.rgb.blue])
newnormpathitems = normpath.normcurve_pt(bezierparams.x0_pt, bezierparams.y0_pt,
bezierparams.x1_pt, bezierparams.y1_pt,
bezierparams.x2_pt, bezierparams.y2_pt,
bezierparams.x3_pt, bezierparams.y3_pt)
showtangent(newnormpathitems) # line alignment of bezier curves
showcircle(newnormpathitems) # circle alignment of bezier curves
else:
# line
newnormpathitems = path.normline_pt(nxs, nys, nxe, nye)
if len(newnormsubpathitems):
newnormsubpathitems.extend(connect(newnormsubpathitems[-1], newnormpathitems, round=round))
newnormsubpathitems.append(newnormpathitems)
if normsubpath.closed:
newnormsubpathitems.extend(connect(newnormsubpathitems[-1], newnormsubpathitems[0], round=round))
newnormsubpaths.append(path.normsubpath(newnormsubpathitems, normsubpath.closed))
return normpath.normpath(newnormsubpaths)
def testparallel_2(c):
# a case with several dangers:
# - double intersection pairs
# - intersections with angle 0
# - inner intersections that have to be cut away by _between_paths
move = (10, 2)
nsp = normpath.normsubpath(
[ # <<<
#ormpath.normline_pt(-87.5005, 184.037, -86.2747, 184.198),
#ormpath.normline_pt(-86.2747, 184.198, -85.0394, 184.252),
#ormpath.normline_pt(-85.0394, 184.252, -83.8041, 184.198),
#ormpath.normline_pt(-83.8041, 184.198, -82.5782, 184.037),
#ormpath.normline_pt(-82.5782, 184.037, -81.3711, 183.769),
#ormpath.normline_pt(-81.3711, 183.769, -80.1918, 183.397),
#ormpath.normline_pt(-80.1918, 183.397, -79.0495, 182.924),
#ormpath.normline_pt(-79.0495, 182.924, -77.9528, 182.353),
#ormpath.normline_pt(-77.9528, 182.353, -76.9099, 181.689),
#ormpath.normline_pt(-76.9099, 181.689, -75.929, 180.936),
#ormpath.normline_pt(-75.929, 180.936, -75.0174, 180.101),
#ormpath.normline_pt(-75.0174, 180.101, -74.1821, 179.189),
#ormpath.normline_pt(-74.1821, 179.189, -73.4293, 178.208),
#ormpath.normline_pt(-73.4293, 178.208, -72.765, 177.165),
#ormpath.normline_pt(-72.765, 177.165, -72.1941, 176.069),
#ormpath.normline_pt(-72.1941, 176.069, -71.7209, 174.926),
#ormpath.normline_pt(-71.7209, 174.926, -71.3491, 173.747),
#ormpath.normline_pt(-71.3491, 173.747, -71.0815, 172.54),
#ormpath.normline_pt(-71.0815, 172.54, -70.9201, 171.314),
#ormpath.normline_pt(-70.9201, 171.314, -70.8661, 170.079),
#ormpath.normline_pt(-70.8661, 170.079, -70.9201, 168.843),
#ormpath.normline_pt(-70.9201, 168.843, -71.0815, 167.618),
#ormpath.normline_pt(-71.0815, 167.618, -71.3491, 166.41),
#ormpath.normline_pt(-71.3491, 166.41, -71.7209, 165.231),
#ormpath.normline_pt(-71.7209, 165.231, -72.1941, 164.089),
#ormpath.normline_pt(-72.1941, 164.089, -72.765, 162.992),
#ormpath.normline_pt(-72.765, 162.992, -73.4293, 161.949),
#ormpath.normline_pt(-73.4293, 161.949, -74.1821, 160.968),
#ormpath.normline_pt(-74.1821, 160.968, -75.0174, 160.057),
#ormpath.normline_pt(-75.0174, 160.057, -75.929, 159.221),
#ormpath.normline_pt(-75.929, 159.221, -76.9099, 158.469),
#ormpath.normline_pt(-76.9099, 158.469, -77.9528, 157.804),
#ormpath.normline_pt(-77.9528, 157.804, -77.9528, -28.3465),
#ormpath.normline_pt(-77.9528, -28.3465, -77.9797, -28.9641),
#ormpath.normline_pt(-77.9797, -28.9641, -78.0604, -29.577),
#ormpath.normline_pt(-78.0604, -29.577, -78.1942, -30.1806),
#ormpath.normline_pt(-78.1942, -30.1806, -78.3801, -30.7702),
#ormpath.normline_pt(-78.3801, -30.7702, -78.6167, -31.3414),
#ormpath.normline_pt(-78.6167, -31.3414, -78.9022, -31.8897),
#ormpath.normline_pt(-78.9022, -31.8897, -79.2344, -32.4111),
#ormpath.normline_pt(-79.2344, -32.4111, -79.6107, -32.9016),
#ormpath.normline_pt(-79.6107, -32.9016, -80.0284, -33.3574),
#ormpath.normline_pt(-80.0284, -33.3574, -80.4842, -33.7751),
#ormpath.normline_pt(-80.4842, -33.7751, -80.9747, -34.1514),
#ormpath.normline_pt(-80.9747, -34.1514, -81.4961, -34.4836),
#ormpath.normline_pt(-81.4961, -34.4836, -82.0444, -34.7691),
#ormpath.normline_pt(-82.0444, -34.7691, -82.6156, -35.0057),
#ormpath.normline_pt(-82.6156, -35.0057, -83.2052, -35.1916),
#ormpath.normline_pt(-83.2052, -35.1916, -83.8088, -35.3254),
#ormpath.normline_pt(-83.8088, -35.3254, -84.3307, -35.3941),
#ormpath.normline_pt(-84.3307, -35.3941, -84.3307, -169.37),
#ormpath.normline_pt(-84.3307, -169.37, -28.423, -169.37),
#ormpath.normline_pt(-28.423, -169.37, 0, -156.252),
#ormpath.normline_pt(0, -156.252, 0, -157.813),
#ormpath.normline_pt(0, -157.813, -28.1117, -170.787),
#ormpath.normline_pt(-28.1117, -170.787, -150, -170.787),
normpath.normline_pt(-150, -170.787, -361.417, -170.787), # start
normpath.normline_pt(-361.417, -170.787, -361.417, -169.37),
normpath.normline_pt(-361.417, -169.37, -299.055, -169.37),
normpath.normline_pt(-299.055, -169.37, -299.055, -141.732),
normpath.normline_pt(-299.055, -141.732, -297.638, -141.732),
normpath.normline_pt(-297.638, -141.732, -297.638, -143.15),
normpath.normline_pt(-297.638, -143.15, -297.638, -169.37),
normpath.normline_pt(-297.638, -169.37, -270.709, -169.37),
normpath.normline_pt(-270.709, -169.37, -270.709, -143.15),
normpath.normline_pt(-270.709, -143.15, -297.638, -143.15),
normpath.normline_pt(-297.638, -143.15, -297.638, -141.732),
normpath.normline_pt(-297.638, -141.732, -284.882, -141.732),
normpath.normline_pt(-284.882, -141.732, -284.882, -113.386),
normpath.normline_pt(-284.882, -113.386, -283.465, -113.386),
normpath.normline_pt(-283.465, -113.386, -283.465, -114.803),
normpath.normline_pt(-283.465, -114.803, -283.465, -141.732),
normpath.normline_pt(-283.465, -141.732, -269.291, -141.732),
normpath.normline_pt(-269.291, -141.732, -269.291, -169.37),
normpath.normline_pt(-269.291, -169.37, -242.362, -169.37),
normpath.normline_pt(-242.362, -169.37, -242.362, -141.732),
normpath.normline_pt(-242.362, -141.732, -240.945, -141.732),
normpath.normline_pt(-240.945, -141.732, -240.945, -143.15),
normpath.normline_pt(-240.945, -143.15, -240.945, -169.37),
normpath.normline_pt(-240.945, -169.37, -214.016, -169.37),
normpath.normline_pt(-214.016, -169.37, -214.016, -143.15),
normpath.normline_pt(-214.016, -143.15, -240.945, -143.15),
normpath.normline_pt(-240.945, -143.15, -240.945, -141.732),
normpath.normline_pt(-240.945, -141.732, -228.189, -141.732),
normpath.normline_pt(-228.189, -141.732, -228.189, -114.803),
normpath.normline_pt(-228.189, -114.803, -283.465, -114.803),
normpath.normline_pt(-283.465, -114.803, -283.465, -113.386),
normpath.normline_pt(-283.465, -113.386, -226.772, -113.386),
normpath.normline_pt(-226.772, -113.386, -226.772, -141.732),
normpath.normline_pt(-226.772, -141.732, -212.598, -141.732),
normpath.normline_pt(-212.598, -141.732, -212.598, -169.37),
normpath.normline_pt(-212.598, -169.37, -150, -169.37), # end
#ormpath.normline_pt(-150, -169.37, -85.748, -169.37),
#ormpath.normline_pt(-85.748, -169.37, -85.748, -35.3941),
#ormpath.normline_pt(-85.748, -35.3941, -86.2699, -35.3254),
#ormpath.normline_pt(-86.2699, -35.3254, -86.8735, -35.1916),
#ormpath.normline_pt(-86.8735, -35.1916, -87.4631, -35.0057),
#ormpath.normline_pt(-87.4631, -35.0057, -88.0343, -34.7691),
#ormpath.normline_pt(-88.0343, -34.7691, -88.5827, -34.4836),
#ormpath.normline_pt(-88.5827, -34.4836, -89.1041, -34.1514),
#ormpath.normline_pt(-89.1041, -34.1514, -89.5946, -33.7751),
#ormpath.normline_pt(-89.5946, -33.7751, -90.0504, -33.3574),
#ormpath.normline_pt(-90.0504, -33.3574, -90.468, -32.9016),
#ormpath.normline_pt(-90.468, -32.9016, -90.8444, -32.4111),
#ormpath.normline_pt(-90.8444, -32.4111, -91.1765, -31.8897),
#ormpath.normline_pt(-91.1765, -31.8897, -91.462, -31.3414),
#ormpath.normline_pt(-91.462, -31.3414, -91.6986, -30.7702),
#ormpath.normline_pt(-91.6986, -30.7702, -91.8845, -30.1806),
#ormpath.normline_pt(-91.8845, -30.1806, -92.0183, -29.577),
#ormpath.normline_pt(-92.0183, -29.577, -92.099, -28.9641),
#ormpath.normline_pt(-92.099, -28.9641, -92.126, -28.3465),
#ormpath.normline_pt(-92.126, -28.3465, -92.126, 157.804),
#ormpath.normline_pt(-92.126, 157.804, -93.1688, 158.469),
#ormpath.normline_pt(-93.1688, 158.469, -94.1498, 159.221),
#ormpath.normline_pt(-94.1498, 159.221, -95.0613, 160.057),
#ormpath.normline_pt(-95.0613, 160.057, -95.8967, 160.968),
#ormpath.normline_pt(-95.8967, 160.968, -96.6494, 161.949),
#ormpath.normline_pt(-96.6494, 161.949, -97.3138, 162.992),
#ormpath.normline_pt(-97.3138, 162.992, -97.8847, 164.089),
#ormpath.normline_pt(-97.8847, 164.089, -98.3578, 165.231),
#ormpath.normline_pt(-98.3578, 165.231, -98.7297, 166.41),
#ormpath.normline_pt(-98.7297, 166.41, -98.9973, 167.618),
#ormpath.normline_pt(-98.9973, 167.618, -99.1587, 168.843),
#ormpath.normline_pt(-99.1587, 168.843, -99.2126, 170.079),
#ormpath.normline_pt(-99.2126, 170.079, -99.1587, 171.314),
#ormpath.normline_pt(-99.1587, 171.314, -98.9973, 172.54),
#ormpath.normline_pt(-98.9973, 172.54, -98.7297, 173.747),
#ormpath.normline_pt(-98.7297, 173.747, -98.3578, 174.926),
#ormpath.normline_pt(-98.3578, 174.926, -97.8847, 176.069),
#ormpath.normline_pt(-97.8847, 176.069, -97.3138, 177.165),
#ormpath.normline_pt(-97.3138, 177.165, -96.6494, 178.208),
#ormpath.normline_pt(-96.6494, 178.208, -95.8967, 179.189),
#ormpath.normline_pt(-95.8967, 179.189, -95.0613, 180.101),
#ormpath.normline_pt(-95.0613, 180.101, -94.1498, 180.936),
#ormpath.normline_pt(-94.1498, 180.936, -93.1688, 181.689),
#ormpath.normline_pt(-93.1688, 181.689, -92.126, 182.353),
#ormpath.normline_pt(-92.126, 182.353, -91.0292, 182.924),
#ormpath.normline_pt(-91.0292, 182.924, -89.8869, 183.397),
#ormpath.normline_pt(-89.8869, 183.397, -88.7077, 183.769),
#ormpath.normline_pt(-88.7077, 183.769, -87.5005, 184.037),
],
closed=1) # >>>
p = normpath.normpath([nsp])
c.stroke(p, [trafo.translate(*move)])
hard_test(c,
p,
0.47504345 - 5 * normpath._epsilon,
parallel(0.0),
move,
"Y",
checklens=[[37, 14], [37, 14], [7, 7], [7, 7]])
hard_test(c,
p,
0.47504345 + 5 * normpath._epsilon,
parallel(0.0),
move,
"Y",
checklens=[[37, 7], [37, 7], [7, 7, 7], [7, 7, 7]])
hard_test(c,
p,
0.5,
parallel(0.0),
move,
"Y",
checklens=[[36, 7], [36, 7], [6, 5, 6, 3, 7, 3],
[6, 3, 7, 3, 5, 6]])
hard_test(c,
p,
0.6125,
parallel(0.0),
move,
"Y",
checklens=[[35], [35], [3], [3]])
hard_test(c,
p,
0.6130,
parallel(0.0),
move,
"Y",
checklens=[[35], [35], [], []])
# a path of two subpaths:
# and with inner intersections to be cut away by _between_paths
move = (0, 0)
p = path.circle(-6, 0, 2)
p += path.path(path.moveto(0, 0), path.curveto(0, 16, -11, 5, 5, 5))
p += path.path(path.lineto(5, 4), path.lineto(7, 4), path.lineto(7, 6),
path.lineto(4, 6), path.lineto(4, 7), path.lineto(5, 7),
path.lineto(3, 1), path.closepath())
p = p.transformed(trafo.scale(0.5)).normpath()
hard_test(c,
p,
0.05,
parallel(0.0),
move,
"Z",
checklens=[[10, 2, 8], [9, 2, 10], [13, 4, 4], [13, 4, 4]])
hard_test(c,
p,
0.3,
parallel(0.0),
move,
"Z",
checklens=[[10, 4, 5], [4, 6, 10], [13, 4], [13, 4]])
hard_test(c,
p,
0.6,
parallel(0.0),
move,
"Z",
checklens=[[], [], [13, 4], [13, 4]])
def testparallel_1(c):
# HARD TESTS of elementary geometry:
#
# test for correct skipping of short ugly pieces:
move = (-2, 0)
p = path.path(path.moveto(0, 1), path.lineto(10, 0.3), path.lineto(12, 0),
path.lineto(0, 0))
p.append(path.closepath())
hard_test(c,
p,
0.1,
parallel(0.0),
move,
"A",
checklens=[[15], [15], [4], [4]])
hard_test(c,
p,
0.25,
parallel(0.0, sharpoutercorners=True),
move,
"A",
checklens=[[12], [12], [3], [3]])
hard_test(c,
p,
0.55,
parallel(0.0),
move,
"A",
checklens=[[15], [15], [], []])
# test non-intersecting/too short neighbouring pathels
move = (0, 4)
p = path.curve(0, 0, 0, 1, 1, 2, 2, 0)
p.append(path.lineto(2.1, 0.1))
p.append(path.lineto(1.6, -2))
p.append(path.lineto(2.1, -2))
p.append(path.lineto(-0.15, 0))
p.append(path.closepath())
hard_test(c,
p,
0.02,
parallel(0.0, sharpoutercorners=1),
move,
"B",
checklens=[[3], [3], [11], [11]])
hard_test(c,
p,
0.06,
parallel(0.0),
move,
"B",
checklens=[[3], [3], [10], [
9
]]) # difference is due to rounding in path._arctobeziers
hard_test(c,
p,
0.3,
parallel(0.0),
move,
"B",
checklens=[[25], [25], [5], [5]])
hard_test(c,
p,
0.3,
parallel(0.0, sharpoutercorners=1),
move,
"B",
checklens=[[22], [22], [5], [5]])
# test extreme precision:
move = (3.5, 2)
p = path.curve(0, 0, 0, 1, 1, 1, 1, 0)
p.append(path.closepath())
hard_test(c,
p,
0.1,
parallel(0.0),
move,
"C",
checklens=[[8], [8], [2], [2]])
hard_test(c,
p,
0.1,
parallel(0.0, relerr=1e-15, checkdistanceparams=[0.5]),
move,
"C",
checklens=[[23], [23], [15], [15]])
# test for numeric instabilities:
move = (6, 2)
p = path.curve(0, 0, 1, 1, 1, 1, 2, 0)
p.append(path.closepath())
hard_test(c,
p,
0.1,
parallel(0.0, relerr=0.15, checkdistanceparams=[0.5]),
move,
"D",
checklens=[[11], [11], [3], [3]])
hard_test(c,
p,
0.3,
parallel(0.0),
move,
"D",
checklens=[[11], [11], [3], [3]])
# test for an empty parallel path:
move = (5, 5)
p = path.circle(0, 0, 0.5).normpath()
nspitems = [
nspitem for nspitem in p[0]
if isinstance(nspitem, normpath.normcurve_pt)
]
nspitems[-1] = nspitems[-1].modifiedend_pt(*nspitems[0].atbegin_pt())
p = normpath.normpath([normpath.normsubpath(nspitems, closed=True)])
hard_test(c,
p,
0.55,
parallel(0.0),
move,
"E",
checklens=[[], [], [9], [9]])
hard_test(c,
p,
0.4999,
parallel(0.0, relerr=1.0e-15),
move,
"E",
checklens=[[1, 14, 8], [1, 14], [17], [17]])
# a degenerate path:
move = (13, 3)
p = path.curve(0, 0, 0, -5, 0, 1, 0, 0.5)
hard_test(c,
p,
0.10,
parallel(0.0, dointersection=False),
move,
"F",
dotests=[True, True, False, False],
checklens=[[13], [12], [13], [12]])
hard_test(c,
p,
0.13,
parallel(0.0, dointersection=False),
move,
"F",
dotests=[False, False, True, True],
checklens=[[13], [12], [13], [12]])
# test for too big curvatures in the middle:
move = (9, 2.5)
p = path.curve(0, 0, 1, 1, 1, 1, 2, 0)
hard_test(c,
p,
0.4,
parallel(0.0, relerr=1.0e-2),
move,
"G",
checklens=[[2], [2], [4], [4]])
hard_test(c,
p,
0.6,
parallel(0.0, relerr=1.0e-2),
move,
"G",
checklens=[[2], [2], [4], [4]])
hard_test(c,
p,
0.8,
parallel(0.0, relerr=1.0e-2),
move,
"G",
checklens=[[2], [2], [4], [4]])
hard_test(c,
p,
1.7,
parallel(0.0, relerr=1.0e-2),
move,
"G",
checklens=[[2], [2], [1, 1], [1, 1]])
# deformation of the deformation:
move = (11, 6)
p = path.curve(-1, 0, 0, 1, 0, 1, 1, 0).normpath()
c.stroke(p, [trafo.translate(*move), color.gray(0.8)])
dist = unit.u_pt / p.curvature_pt([normpath.normpathparam(p, 0, 0.5)])[0]
p = parallel(dist, relerr=1.0e-2, dointersection=0).deform(p)
assert len(p) == 2
assert len(p[0]) == len(p[1]) == 2
c.stroke(p, [trafo.translate(*move), color.gray(0.8)])
hard_test(c,
p,
-dist,
parallel(0.0),
move,
"H",
checklens=[[4], [4], [2], [2]])
# test for infinite curvature in the middle:
move = (11, 8.5)
p = path.curve(0, 0, 1, 1, 0, 1, 1, 0).normpath()
hard_test(c,
p,
0.2,
parallel(0.0),
move,
"I",
checklens=[[1, 1], [1, 1], [2], [2]])
hard_test(c,
p,
1.5,
parallel(0.0),
move,
"I",
checklens=[[1, 1], [1, 1], [7], [7]])
#ard_test(c, p, 5.0, parallel(0.0), move, "I", checklens=[[],[],[7],[7]])
# test for infinite curvature at the end:
move = (-2, 13)
p = path.curve(0, 0, 0.5, 0.5, 0.75, 0.5, 0.75, 0.5)
hard_test(c,
p,
0.1,
parallel(0.0, relerr=1.0e-4),
move,
"J",
checklens=[[5], [5], [5], [5]])
# test for infinite curvature when the path goes on
# XXX this is not correctly detected if rlineto(1,0). Expect two nsp
p.append(path.rlineto(0, 1))
hard_test(c,
p,
0.22,
parallel(0.0, relerr=1.0e-4),
move,
"J",
checklens=[[4], [4], [3, 1], [1, 3]])
# test for too big curvature in the middle, the non-intersecting case
move = (0, 8)
p = path.curve(-1, -1, 4, 4, -4, 4, 1, -1).normpath()
dist = unit.u_pt * (1.0 /
p.curvature_pt([normpath.normpathparam(p, 0, 0.5)])[0])
hard_test(c,
p,
1.5 * dist,
parallel(0.0, dointersection=False),
move,
"K",
checklens=[[1, 1], [1, 1], [2], [2]])
hard_test(c,
p,
dist + normpath._epsilon,
parallel(0.0, dointersection=False, relerr=1.0e-5),
move,
"K",
checklens=[[11, 11], [11, 11], [16], [16]])
hard_test(c,
p,
dist + 0 * normpath._epsilon,
parallel(0.0, dointersection=False, relerr=1.0e-5),
move,
"K",
checklens=[[22], [22], [16], [16]])
# what is to be done with the arcs running around corners?
# for dist=1.1 they do not even intersect with the original path:
# TODO
move = (8, 14)
p = path.rect(0, 0, 1, 1).normpath()
hard_test(c,
p,
1.1,
parallel(0.0),
move,
"L",
dotests=[True, True, False, False],
checklens=[[20], [20], None, None])
hard_test(c,
p,
0.55,
parallel(0.0),
move,
"L",
dotests=[True, True, False, False],
checklens=[[28], [28], None, None])
# very small lines approximating a curve
# make sure that there is no "dust" remaining from the many intersections
move = (3, 9)
N = 12
angle = 0.5 * math.pi / (N - 1.0)
p = path.path(path.moveto(0, 0))
for n in range(N):
p.append(path.lineto(2 + math.sin(n * angle), 1 - math.cos(n * angle)))
p.append(path.rlineto(0, 1))
p.append(path.rlineto(2, 0))
p.append(path.rlineto(0, -2))
p = p.transformed(trafo.translate(0, 0.05))
p = p << p.transformed(trafo.scale(1, -1)).reversed()
hard_test(c,
p,
0.6,
parallel(0.0),
move,
"M",
checklens=[[43], [43], [29], [29]])
# intersections where paths are parallel (in the middle of a nsp-item)
move = (4, 15)
c.text(move[0], move[1] + 0.2, "N")
tr = trafo.translate(*move)
par = parallel(0.1)
par.dist_pt = unit.topt(par.distance)
c1 = path.curve(-2, -1, -2, 1, 2, -1, 2, 1).transformed(tr).normpath()
c2 = path.curve(-2, -1, -2, 1 / 3.0, 2, 1 / 3.0, 2,
-1).transformed(tr).normpath()
l = path.line(-2, 0, 2, 0).transformed(tr).normpath()
for p in [c1, c2, l]:
c.stroke(p)
p = (c1 + l).normpath()
try:
par._can_continue(mynormpathparam(p, 0, 0, 0.5),
mynormpathparam(p, 1, 0, 0.5))
except IntersectionError as e:
assert str(
e
) == "Cannot determine whether curves intersect (parallel and equally curved)"
p = c2 + l
assert par._can_continue(mynormpathparam(p, 0, 0, 0.5),
mynormpathparam(p, 1, 0, 0.5))
p = c2 + l.reversed()
assert par._can_continue(mynormpathparam(p, 0, 0, 0.5),
mynormpathparam(p, 1, 0, 0.5))
p = c2.reversed() + l
assert not par._can_continue(mynormpathparam(p, 0, 0, 0.5),
mynormpathparam(p, 1, 0, 0.5))
p = c2.reversed() + l.reversed()
assert not par._can_continue(mynormpathparam(p, 0, 0, 0.5),
mynormpathparam(p, 1, 0, 0.5))
p = c1 + c2
assert not par._can_continue(mynormpathparam(p, 0, 0, 0.5),
mynormpathparam(p, 1, 0, 0.5))
p = c2 + c1
assert par._can_continue(mynormpathparam(p, 0, 0, 0.5),
mynormpathparam(p, 1, 0, 0.5))
# intersections where paths are parallel (between nsp-items)
c11, c12 = c1.split([normpath.normpathparam(c1, 0, 0.5)])
c21, c22 = c2.split([normpath.normpathparam(c2, 0, 0.5)])
l1, l2 = l.split([normpath.normpathparam(l, 0, 0.5)])
p = (c21 << l2 + l1 << c22).normpath() # curve-line + line-curve
assert par._can_continue(mynormpathparam(p, 1, 0, 1),
mynormpathparam(p, 0, 1, 0)) # line -> line
assert not par._can_continue(mynormpathparam(p, 0, 0, 1),
mynormpathparam(p, 1, 1, 0)) # curve -> curve
# intersections where paths are parallel (in the middle of a nsp-item)
move = (12, 13)
p1 = path.path(path.moveto(0, 0), path.curveto(0, 3, 1, 5, 1,
0)).normpath()
params1, params2 = p1.intersect(path.line(0.5, -1, 0.5, 5))
p11, p12 = p1.split(params1)
p11.append(path.rlineto(0, -2))
p = p11 << p12
p.append(path.closepath())
hard_test(c,
p,
0.55,
parallel(0.0),
move,
"O",
dotests=[True, True, False, False],
checklens=[[10], [10], None, None])
# jump to too large curvature between nspitems
move = (-2, 17)
p = path.path(path.moveto(0, 0), path.arc(2, 0.5, 0.5, -90, 90),
path.lineto(0, 1)).normpath()
hard_test(c,
p,
0.55,
parallel(0.0),
move,
"P",
dotests=[True, True, True, True],
checklens=[[1, 1], [1, 1], [7], [7]])
def testparallel_2(c):
# a case with several dangers:
# - double intersection pairs
# - intersections with angle 0
# - inner intersections that have to be cut away by _between_paths
move = (10, 2)
nsp = normpath.normsubpath(
[ # <<<
#ormpath.normline_pt(-87.5005, 184.037, -86.2747, 184.198),
#ormpath.normline_pt(-86.2747, 184.198, -85.0394, 184.252),
#ormpath.normline_pt(-85.0394, 184.252, -83.8041, 184.198),
#ormpath.normline_pt(-83.8041, 184.198, -82.5782, 184.037),
#ormpath.normline_pt(-82.5782, 184.037, -81.3711, 183.769),
#ormpath.normline_pt(-81.3711, 183.769, -80.1918, 183.397),
#ormpath.normline_pt(-80.1918, 183.397, -79.0495, 182.924),
#ormpath.normline_pt(-79.0495, 182.924, -77.9528, 182.353),
#ormpath.normline_pt(-77.9528, 182.353, -76.9099, 181.689),
#ormpath.normline_pt(-76.9099, 181.689, -75.929, 180.936),
#ormpath.normline_pt(-75.929, 180.936, -75.0174, 180.101),
#ormpath.normline_pt(-75.0174, 180.101, -74.1821, 179.189),
#ormpath.normline_pt(-74.1821, 179.189, -73.4293, 178.208),
#ormpath.normline_pt(-73.4293, 178.208, -72.765, 177.165),
#ormpath.normline_pt(-72.765, 177.165, -72.1941, 176.069),
#ormpath.normline_pt(-72.1941, 176.069, -71.7209, 174.926),
#ormpath.normline_pt(-71.7209, 174.926, -71.3491, 173.747),
#ormpath.normline_pt(-71.3491, 173.747, -71.0815, 172.54),
#ormpath.normline_pt(-71.0815, 172.54, -70.9201, 171.314),
#ormpath.normline_pt(-70.9201, 171.314, -70.8661, 170.079),
#ormpath.normline_pt(-70.8661, 170.079, -70.9201, 168.843),
#ormpath.normline_pt(-70.9201, 168.843, -71.0815, 167.618),
#ormpath.normline_pt(-71.0815, 167.618, -71.3491, 166.41),
#ormpath.normline_pt(-71.3491, 166.41, -71.7209, 165.231),
#ormpath.normline_pt(-71.7209, 165.231, -72.1941, 164.089),
#ormpath.normline_pt(-72.1941, 164.089, -72.765, 162.992),
#ormpath.normline_pt(-72.765, 162.992, -73.4293, 161.949),
#ormpath.normline_pt(-73.4293, 161.949, -74.1821, 160.968),
#ormpath.normline_pt(-74.1821, 160.968, -75.0174, 160.057),
#ormpath.normline_pt(-75.0174, 160.057, -75.929, 159.221),
#ormpath.normline_pt(-75.929, 159.221, -76.9099, 158.469),
#ormpath.normline_pt(-76.9099, 158.469, -77.9528, 157.804),
#ormpath.normline_pt(-77.9528, 157.804, -77.9528, -28.3465),
#ormpath.normline_pt(-77.9528, -28.3465, -77.9797, -28.9641),
#ormpath.normline_pt(-77.9797, -28.9641, -78.0604, -29.577),
#ormpath.normline_pt(-78.0604, -29.577, -78.1942, -30.1806),
#ormpath.normline_pt(-78.1942, -30.1806, -78.3801, -30.7702),
#ormpath.normline_pt(-78.3801, -30.7702, -78.6167, -31.3414),
#ormpath.normline_pt(-78.6167, -31.3414, -78.9022, -31.8897),
#ormpath.normline_pt(-78.9022, -31.8897, -79.2344, -32.4111),
#ormpath.normline_pt(-79.2344, -32.4111, -79.6107, -32.9016),
#ormpath.normline_pt(-79.6107, -32.9016, -80.0284, -33.3574),
#ormpath.normline_pt(-80.0284, -33.3574, -80.4842, -33.7751),
#ormpath.normline_pt(-80.4842, -33.7751, -80.9747, -34.1514),
#ormpath.normline_pt(-80.9747, -34.1514, -81.4961, -34.4836),
#ormpath.normline_pt(-81.4961, -34.4836, -82.0444, -34.7691),
#ormpath.normline_pt(-82.0444, -34.7691, -82.6156, -35.0057),
#ormpath.normline_pt(-82.6156, -35.0057, -83.2052, -35.1916),
#ormpath.normline_pt(-83.2052, -35.1916, -83.8088, -35.3254),
#ormpath.normline_pt(-83.8088, -35.3254, -84.3307, -35.3941),
#ormpath.normline_pt(-84.3307, -35.3941, -84.3307, -169.37),
#ormpath.normline_pt(-84.3307, -169.37, -28.423, -169.37),
#ormpath.normline_pt(-28.423, -169.37, 0, -156.252),
#ormpath.normline_pt(0, -156.252, 0, -157.813),
#ormpath.normline_pt(0, -157.813, -28.1117, -170.787),
#ormpath.normline_pt(-28.1117, -170.787, -150, -170.787),
normpath.normline_pt(-150, -170.787, -361.417, -170.787), # start
normpath.normline_pt(-361.417, -170.787, -361.417, -169.37),
normpath.normline_pt(-361.417, -169.37, -299.055, -169.37),
normpath.normline_pt(-299.055, -169.37, -299.055, -141.732),
normpath.normline_pt(-299.055, -141.732, -297.638, -141.732),
normpath.normline_pt(-297.638, -141.732, -297.638, -143.15),
normpath.normline_pt(-297.638, -143.15, -297.638, -169.37),
normpath.normline_pt(-297.638, -169.37, -270.709, -169.37),
normpath.normline_pt(-270.709, -169.37, -270.709, -143.15),
normpath.normline_pt(-270.709, -143.15, -297.638, -143.15),
normpath.normline_pt(-297.638, -143.15, -297.638, -141.732),
normpath.normline_pt(-297.638, -141.732, -284.882, -141.732),
normpath.normline_pt(-284.882, -141.732, -284.882, -113.386),
normpath.normline_pt(-284.882, -113.386, -283.465, -113.386),
normpath.normline_pt(-283.465, -113.386, -283.465, -114.803),
normpath.normline_pt(-283.465, -114.803, -283.465, -141.732),
normpath.normline_pt(-283.465, -141.732, -269.291, -141.732),
normpath.normline_pt(-269.291, -141.732, -269.291, -169.37),
normpath.normline_pt(-269.291, -169.37, -242.362, -169.37),
normpath.normline_pt(-242.362, -169.37, -242.362, -141.732),
normpath.normline_pt(-242.362, -141.732, -240.945, -141.732),
normpath.normline_pt(-240.945, -141.732, -240.945, -143.15),
normpath.normline_pt(-240.945, -143.15, -240.945, -169.37),
normpath.normline_pt(-240.945, -169.37, -214.016, -169.37),
normpath.normline_pt(-214.016, -169.37, -214.016, -143.15),
normpath.normline_pt(-214.016, -143.15, -240.945, -143.15),
normpath.normline_pt(-240.945, -143.15, -240.945, -141.732),
normpath.normline_pt(-240.945, -141.732, -228.189, -141.732),
normpath.normline_pt(-228.189, -141.732, -228.189, -114.803),
normpath.normline_pt(-228.189, -114.803, -283.465, -114.803),
normpath.normline_pt(-283.465, -114.803, -283.465, -113.386),
normpath.normline_pt(-283.465, -113.386, -226.772, -113.386),
normpath.normline_pt(-226.772, -113.386, -226.772, -141.732),
normpath.normline_pt(-226.772, -141.732, -212.598, -141.732),
normpath.normline_pt(-212.598, -141.732, -212.598, -169.37),
normpath.normline_pt(-212.598, -169.37, -150, -169.37), # end
#ormpath.normline_pt(-150, -169.37, -85.748, -169.37),
#ormpath.normline_pt(-85.748, -169.37, -85.748, -35.3941),
#ormpath.normline_pt(-85.748, -35.3941, -86.2699, -35.3254),
#ormpath.normline_pt(-86.2699, -35.3254, -86.8735, -35.1916),
#ormpath.normline_pt(-86.8735, -35.1916, -87.4631, -35.0057),
#ormpath.normline_pt(-87.4631, -35.0057, -88.0343, -34.7691),
#ormpath.normline_pt(-88.0343, -34.7691, -88.5827, -34.4836),
#ormpath.normline_pt(-88.5827, -34.4836, -89.1041, -34.1514),
#ormpath.normline_pt(-89.1041, -34.1514, -89.5946, -33.7751),
#ormpath.normline_pt(-89.5946, -33.7751, -90.0504, -33.3574),
#ormpath.normline_pt(-90.0504, -33.3574, -90.468, -32.9016),
#ormpath.normline_pt(-90.468, -32.9016, -90.8444, -32.4111),
#ormpath.normline_pt(-90.8444, -32.4111, -91.1765, -31.8897),
#ormpath.normline_pt(-91.1765, -31.8897, -91.462, -31.3414),
#ormpath.normline_pt(-91.462, -31.3414, -91.6986, -30.7702),
#ormpath.normline_pt(-91.6986, -30.7702, -91.8845, -30.1806),
#ormpath.normline_pt(-91.8845, -30.1806, -92.0183, -29.577),
#ormpath.normline_pt(-92.0183, -29.577, -92.099, -28.9641),
#ormpath.normline_pt(-92.099, -28.9641, -92.126, -28.3465),
#ormpath.normline_pt(-92.126, -28.3465, -92.126, 157.804),
#ormpath.normline_pt(-92.126, 157.804, -93.1688, 158.469),
#ormpath.normline_pt(-93.1688, 158.469, -94.1498, 159.221),
#ormpath.normline_pt(-94.1498, 159.221, -95.0613, 160.057),
#ormpath.normline_pt(-95.0613, 160.057, -95.8967, 160.968),
#ormpath.normline_pt(-95.8967, 160.968, -96.6494, 161.949),
#ormpath.normline_pt(-96.6494, 161.949, -97.3138, 162.992),
#ormpath.normline_pt(-97.3138, 162.992, -97.8847, 164.089),
#ormpath.normline_pt(-97.8847, 164.089, -98.3578, 165.231),
#ormpath.normline_pt(-98.3578, 165.231, -98.7297, 166.41),
#ormpath.normline_pt(-98.7297, 166.41, -98.9973, 167.618),
#ormpath.normline_pt(-98.9973, 167.618, -99.1587, 168.843),
#ormpath.normline_pt(-99.1587, 168.843, -99.2126, 170.079),
#ormpath.normline_pt(-99.2126, 170.079, -99.1587, 171.314),
#ormpath.normline_pt(-99.1587, 171.314, -98.9973, 172.54),
#ormpath.normline_pt(-98.9973, 172.54, -98.7297, 173.747),
#ormpath.normline_pt(-98.7297, 173.747, -98.3578, 174.926),
#ormpath.normline_pt(-98.3578, 174.926, -97.8847, 176.069),
#ormpath.normline_pt(-97.8847, 176.069, -97.3138, 177.165),
#ormpath.normline_pt(-97.3138, 177.165, -96.6494, 178.208),
#ormpath.normline_pt(-96.6494, 178.208, -95.8967, 179.189),
#ormpath.normline_pt(-95.8967, 179.189, -95.0613, 180.101),
#ormpath.normline_pt(-95.0613, 180.101, -94.1498, 180.936),
#ormpath.normline_pt(-94.1498, 180.936, -93.1688, 181.689),
#ormpath.normline_pt(-93.1688, 181.689, -92.126, 182.353),
#ormpath.normline_pt(-92.126, 182.353, -91.0292, 182.924),
#ormpath.normline_pt(-91.0292, 182.924, -89.8869, 183.397),
#ormpath.normline_pt(-89.8869, 183.397, -88.7077, 183.769),
#ormpath.normline_pt(-88.7077, 183.769, -87.5005, 184.037),
],
closed=1) # >>>
p = normpath.normpath([nsp])
c.stroke(p, [trafo.translate(*move)])
hard_test(
c,
p,
0.47504345 - 5 * normpath._epsilon,
parallel(0.0),
move,
"Y",
checklens=[[37, 14], [37, 14], [7, 7], [7, 7]])
hard_test(
c,
p,
0.47504345 + 5 * normpath._epsilon,
parallel(0.0),
move,
"Y",
checklens=[[37, 7], [37, 7], [7, 7, 7], [7, 7, 7]])
hard_test(
c,
p,
0.5,
parallel(0.0),
move,
"Y",
checklens=[[36, 7], [36, 7], [6, 5, 6, 3, 7, 3], [6, 3, 7, 3, 5, 6]])
hard_test(
c,
p,
0.6125,
parallel(0.0),
move,
"Y",
checklens=[[35], [35], [3], [3]])
hard_test(
c, p, 0.6130, parallel(0.0), move, "Y", checklens=[[35], [35], [], []])
# a path of two subpaths:
# and with inner intersections to be cut away by _between_paths
move = (0, 0)
p = path.circle(-6, 0, 2)
p += path.path(path.moveto(0, 0), path.curveto(0, 16, -11, 5, 5, 5))
p += path.path(
path.lineto(5, 4), path.lineto(7, 4), path.lineto(7, 6),
path.lineto(4, 6), path.lineto(4, 7), path.lineto(5, 7),
path.lineto(3, 1), path.closepath())
p = p.transformed(trafo.scale(0.5)).normpath()
hard_test(
c,
p,
0.05,
parallel(0.0),
move,
"Z",
checklens=[[10, 2, 8], [9, 2, 10], [13, 4, 4], [13, 4, 4]])
hard_test(
c,
p,
0.3,
parallel(0.0),
move,
"Z",
checklens=[[10, 4, 5], [4, 6, 10], [13, 4], [13, 4]])
hard_test(
c,
p,
0.6,
parallel(0.0),
move,
"Z",
checklens=[[], [], [13, 4], [13, 4]])
def testparallel_1(c):
# HARD TESTS of elementary geometry:
#
# test for correct skipping of short ugly pieces:
move = (-2, 0)
p = path.path(
path.moveto(0, 1), path.lineto(10, 0.3), path.lineto(12, 0),
path.lineto(0, 0))
p.append(path.closepath())
hard_test(
c, p, 0.1, parallel(0.0), move, "A", checklens=[[15], [15], [4], [4]])
hard_test(
c,
p,
0.25,
parallel(0.0, sharpoutercorners=True),
move,
"A",
checklens=[[12], [12], [3], [3]])
hard_test(
c, p, 0.55, parallel(0.0), move, "A", checklens=[[15], [15], [], []])
# test non-intersecting/too short neighbouring pathels
move = (0, 4)
p = path.curve(0, 0, 0, 1, 1, 2, 2, 0)
p.append(path.lineto(2.1, 0.1))
p.append(path.lineto(1.6, -2))
p.append(path.lineto(2.1, -2))
p.append(path.lineto(-0.15, 0))
p.append(path.closepath())
hard_test(
c,
p,
0.02,
parallel(0.0, sharpoutercorners=1),
move,
"B",
checklens=[[3], [3], [11], [11]])
hard_test(
c, p, 0.06, parallel(0.0), move, "B",
checklens=[[3], [3], [10],
[9]]) # difference is due to rounding in path._arctobeziers
hard_test(
c, p, 0.3, parallel(0.0), move, "B", checklens=[[25], [25], [5], [5]])
hard_test(
c,
p,
0.3,
parallel(0.0, sharpoutercorners=1),
move,
"B",
checklens=[[22], [22], [5], [5]])
# test extreme precision:
move = (3.5, 2)
p = path.curve(0, 0, 0, 1, 1, 1, 1, 0)
p.append(path.closepath())
hard_test(
c, p, 0.1, parallel(0.0), move, "C", checklens=[[8], [8], [2], [2]])
hard_test(
c,
p,
0.1,
parallel(0.0, relerr=1e-15, checkdistanceparams=[0.5]),
move,
"C",
checklens=[[23], [23], [15], [15]])
# test for numeric instabilities:
move = (6, 2)
p = path.curve(0, 0, 1, 1, 1, 1, 2, 0)
p.append(path.closepath())
hard_test(
c,
p,
0.1,
parallel(0.0, relerr=0.15, checkdistanceparams=[0.5]),
move,
"D",
checklens=[[11], [11], [3], [3]])
hard_test(
c, p, 0.3, parallel(0.0), move, "D", checklens=[[11], [11], [3], [3]])
# test for an empty parallel path:
move = (5, 5)
p = path.circle(0, 0, 0.5).normpath()
nspitems = [
nspitem for nspitem in p[0]
if isinstance(nspitem, normpath.normcurve_pt)
]
nspitems[-1] = nspitems[-1].modifiedend_pt(*nspitems[0].atbegin_pt())
p = normpath.normpath([normpath.normsubpath(nspitems, closed=True)])
hard_test(
c, p, 0.55, parallel(0.0), move, "E", checklens=[[], [], [9], [9]])
hard_test(
c,
p,
0.4999,
parallel(0.0, relerr=1.0e-15),
move,
"E",
checklens=[[1, 14, 8], [1, 14], [17], [17]])
# a degenerate path:
move = (13, 3)
p = path.curve(0, 0, 0, -5, 0, 1, 0, 0.5)
hard_test(
c,
p,
0.10,
parallel(0.0, dointersection=False),
move,
"F",
dotests=[True, True, False, False],
checklens=[[13], [12], [13], [12]])
hard_test(
c,
p,
0.13,
parallel(0.0, dointersection=False),
move,
"F",
dotests=[False, False, True, True],
checklens=[[13], [12], [13], [12]])
# test for too big curvatures in the middle:
move = (9, 2.5)
p = path.curve(0, 0, 1, 1, 1, 1, 2, 0)
hard_test(
c,
p,
0.4,
parallel(0.0, relerr=1.0e-2),
move,
"G",
checklens=[[2], [2], [4], [4]])
hard_test(
c,
p,
0.6,
parallel(0.0, relerr=1.0e-2),
move,
"G",
checklens=[[2], [2], [4], [4]])
hard_test(
c,
p,
0.8,
parallel(0.0, relerr=1.0e-2),
move,
"G",
checklens=[[2], [2], [4], [4]])
hard_test(
c,
p,
1.7,
parallel(0.0, relerr=1.0e-2),
move,
"G",
checklens=[[2], [2], [1, 1], [1, 1]])
# deformation of the deformation:
move = (11, 6)
p = path.curve(-1, 0, 0, 1, 0, 1, 1, 0).normpath()
c.stroke(p, [trafo.translate(*move), color.gray(0.8)])
dist = unit.u_pt / p.curvature_pt([normpath.normpathparam(p, 0, 0.5)])[0]
p = parallel(dist, relerr=1.0e-2, dointersection=0).deform(p)
assert len(p) == 2
assert len(p[0]) == len(p[1]) == 2
c.stroke(p, [trafo.translate(*move), color.gray(0.8)])
hard_test(
c, p, -dist, parallel(0.0), move, "H", checklens=[[4], [4], [2], [2]])
# test for infinite curvature in the middle:
move = (11, 8.5)
p = path.curve(0, 0, 1, 1, 0, 1, 1, 0).normpath()
hard_test(
c,
p,
0.2,
parallel(0.0),
move,
"I",
checklens=[[1, 1], [1, 1], [2], [2]])
hard_test(
c,
p,
1.5,
parallel(0.0),
move,
"I",
checklens=[[1, 1], [1, 1], [7], [7]])
#ard_test(c, p, 5.0, parallel(0.0), move, "I", checklens=[[],[],[7],[7]])
# test for infinite curvature at the end:
move = (-2, 13)
p = path.curve(0, 0, 0.5, 0.5, 0.75, 0.5, 0.75, 0.5)
hard_test(
c,
p,
0.1,
parallel(0.0, relerr=1.0e-4),
move,
"J",
checklens=[[5], [5], [5], [5]])
# test for infinite curvature when the path goes on
# XXX this is not correctly detected if rlineto(1,0). Expect two nsp
p.append(path.rlineto(0, 1))
hard_test(
c,
p,
0.22,
parallel(0.0, relerr=1.0e-4),
move,
"J",
checklens=[[4], [4], [3, 1], [1, 3]])
# test for too big curvature in the middle, the non-intersecting case
move = (0, 8)
p = path.curve(-1, -1, 4, 4, -4, 4, 1, -1).normpath()
dist = unit.u_pt * (
1.0 / p.curvature_pt([normpath.normpathparam(p, 0, 0.5)])[0])
hard_test(
c,
p,
1.5 * dist,
parallel(0.0, dointersection=False),
move,
"K",
checklens=[[1, 1], [1, 1], [2], [2]])
hard_test(
c,
p,
dist + normpath._epsilon,
parallel(0.0, dointersection=False, relerr=1.0e-5),
move,
"K",
checklens=[[11, 11], [11, 11], [16], [16]])
hard_test(
c,
p,
dist + 0 * normpath._epsilon,
parallel(0.0, dointersection=False, relerr=1.0e-5),
move,
"K",
checklens=[[22], [22], [16], [16]])
# what is to be done with the arcs running around corners?
# for dist=1.1 they do not even intersect with the original path:
# TODO
move = (8, 14)
p = path.rect(0, 0, 1, 1).normpath()
hard_test(
c,
p,
1.1,
parallel(0.0),
move,
"L",
dotests=[True, True, False, False],
checklens=[[20], [20], None, None])
hard_test(
c,
p,
0.55,
parallel(0.0),
move,
"L",
dotests=[True, True, False, False],
checklens=[[28], [28], None, None])
# very small lines approximating a curve
# make sure that there is no "dust" remaining from the many intersections
move = (3, 9)
N = 12
angle = 0.5 * math.pi / (N - 1.0)
p = path.path(path.moveto(0, 0))
for n in range(N):
p.append(path.lineto(2 + math.sin(n * angle), 1 - math.cos(n * angle)))
p.append(path.rlineto(0, 1))
p.append(path.rlineto(2, 0))
p.append(path.rlineto(0, -2))
p = p.transformed(trafo.translate(0, 0.05))
p = p << p.transformed(trafo.scale(1, -1)).reversed()
hard_test(
c,
p,
0.6,
parallel(0.0),
move,
"M",
checklens=[[43], [43], [29], [29]])
# intersections where paths are parallel (in the middle of a nsp-item)
move = (4, 15)
c.text(move[0], move[1] + 0.2, "N")
tr = trafo.translate(*move)
par = parallel(0.1)
par.dist_pt = unit.topt(par.distance)
c1 = path.curve(-2, -1, -2, 1, 2, -1, 2, 1).transformed(tr).normpath()
c2 = path.curve(-2, -1, -2, 1 / 3.0, 2, 1 / 3.0, 2,
-1).transformed(tr).normpath()
l = path.line(-2, 0, 2, 0).transformed(tr).normpath()
for p in [c1, c2, l]:
c.stroke(p)
p = (c1 + l).normpath()
try:
par._can_continue(
mynormpathparam(p, 0, 0, 0.5), mynormpathparam(p, 1, 0, 0.5))
except IntersectionError as e:
assert str(
e
) == "Cannot determine whether curves intersect (parallel and equally curved)"
p = c2 + l
assert par._can_continue(
mynormpathparam(p, 0, 0, 0.5), mynormpathparam(p, 1, 0, 0.5))
p = c2 + l.reversed()
assert par._can_continue(
mynormpathparam(p, 0, 0, 0.5), mynormpathparam(p, 1, 0, 0.5))
p = c2.reversed() + l
assert not par._can_continue(
mynormpathparam(p, 0, 0, 0.5), mynormpathparam(p, 1, 0, 0.5))
p = c2.reversed() + l.reversed()
assert not par._can_continue(
mynormpathparam(p, 0, 0, 0.5), mynormpathparam(p, 1, 0, 0.5))
p = c1 + c2
assert not par._can_continue(
mynormpathparam(p, 0, 0, 0.5), mynormpathparam(p, 1, 0, 0.5))
p = c2 + c1
assert par._can_continue(
mynormpathparam(p, 0, 0, 0.5), mynormpathparam(p, 1, 0, 0.5))
# intersections where paths are parallel (between nsp-items)
c11, c12 = c1.split([normpath.normpathparam(c1, 0, 0.5)])
c21, c22 = c2.split([normpath.normpathparam(c2, 0, 0.5)])
l1, l2 = l.split([normpath.normpathparam(l, 0, 0.5)])
p = (c21 << l2 + l1 << c22).normpath() # curve-line + line-curve
assert par._can_continue(
mynormpathparam(p, 1, 0, 1), mynormpathparam(p, 0, 1,
0)) # line -> line
assert not par._can_continue(
mynormpathparam(p, 0, 0, 1), mynormpathparam(p, 1, 1,
0)) # curve -> curve
# intersections where paths are parallel (in the middle of a nsp-item)
move = (12, 13)
p1 = path.path(path.moveto(0, 0), path.curveto(0, 3, 1, 5, 1,
0)).normpath()
params1, params2 = p1.intersect(path.line(0.5, -1, 0.5, 5))
p11, p12 = p1.split(params1)
p11.append(path.rlineto(0, -2))
p = p11 << p12
p.append(path.closepath())
hard_test(
c,
p,
0.55,
parallel(0.0),
move,
"O",
dotests=[True, True, False, False],
checklens=[[10], [10], None, None])
# jump to too large curvature between nspitems
move = (-2, 17)
p = path.path(
path.moveto(0, 0), path.arc(2, 0.5, 0.5, -90, 90),
path.lineto(0, 1)).normpath()
hard_test(
c,
p,
0.55,
parallel(0.0),
move,
"P",
dotests=[True, True, True, True],
checklens=[[1, 1], [1, 1], [7], [7]])
def test_reproductions(seed, n_tests, xmax, ymax, accuracy): # <<<
# insert xmax, ymax, accuracy in pt!
r = Random(seed)
n_testpoints = 20
testparams = [i / (n_testpoints - 1.0) for i in range(n_testpoints)]
# a canvas for drawing
can = canvas.canvas()
xpos = 0
ypos = 0
# loop over many different cases
n_failures = 0
n_successes = 0
for cnt in range(n_tests):
# the original curve
a = r.uniform(0, xmax), r.uniform(0, ymax)
b = r.uniform(0, xmax), r.uniform(0, ymax)
c = r.uniform(0, xmax), r.uniform(0, ymax)
d = r.uniform(0, xmax), r.uniform(0, ymax)
origcurve = normpath.normcurve_pt(a[0], a[1], b[0], b[1], c[0], c[1], d[0], d[1])
tbeg, tend = origcurve.rotation([0, 1])
cbeg, cend = origcurve.curvature_pt([0, 1])
# raise an error if one of the params is invalid:
tbeg, tend, cbeg, cend
tbeg, tend = tbeg.apply_pt(1, 0), tend.apply_pt(1, 0)
# the reproduced curve
controldistpairs = controldists_from_endgeometry_pt(a, d, tbeg, tend, cbeg, cend, _epsilon)
reprocurves = []
for controldistpair in controldistpairs:
alpha, beta = controldistpair
reprocurves.append(
normpath.normcurve_pt(
a[0],
a[1],
a[0] + alpha * tbeg[0],
a[1] + alpha * tbeg[1],
d[0] - beta * tend[0],
d[1] - beta * tend[1],
d[0],
d[1],
)
)
# analyse the quality of the reproduction
minmaxdist = float("inf")
minindex = -1
maxdists = []
for i, reprocurve in enumerate(reprocurves):
maxdist = max(
[
math.hypot(p[0] - q[0], p[1] - q[1])
for p, q in zip(origcurve.at_pt(testparams), reprocurve.at_pt(testparams))
]
)
if maxdist < minmaxdist:
minmaxdist = maxdist
minindex = i
maxdists.append(maxdist)
# print complaints for too bad reproductions
if minindex != 0 or minmaxdist > accuracy:
n_failures += 1
if minmaxdist > accuracy:
print("%4d Smallest distance is %f" % (cnt, minmaxdist))
if minindex == -1:
print("%4d Failure: no solution found" % (cnt))
if minindex > 0:
print("%4d Wrong sorting: entry %d is the smallest" % (cnt, minindex))
if minindex >= 0 and not (controldistpairs[minindex][0] >= 0 and controldistpairs[minindex][1] >= 0):
print("%4d Failure: signs are wrong" % (cnt))
# selectively draw the curves:
# if minindex == -1:
# if minindex > 0:
if minmaxdist > accuracy:
# draw the failure curves
can.stroke(path.rect_pt(0, 0, xmax, ymax), [trafo.translate_pt(xpos, ypos)])
can.draw(
normpath.normpath([normpath.normsubpath([origcurve])]),
[trafo.translate_pt(xpos, ypos), deco.stroked([style.linewidth.THIck]), deco.shownormpath()],
)
if minindex != -1:
can.stroke(
normpath.normpath([normpath.normsubpath([reprocurves[minindex]])]),
[trafo.translate_pt(xpos, ypos), color.rgb.red],
)
can.text(
0,
0,
r"(%d)" % (cnt),
[trafo.translate_pt(xpos + 0.5 * xmax, ypos), text.halign.center, text.vshift(2.0)],
)
xpos += 1.1 * xmax
if xpos > 11 * xmax:
xpos = 0
ypos -= 1.1 * ymax
ypos -= 15
else:
n_successes += 1
print("failures, successes = ", n_failures, ", ", n_successes)
can.writeEPSfile("test_bezier")