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This is a python library for pattern cutting.

Vector class

A class for 2d cartesian coordinates. Its used for point coordinates and also for 2d vectors

from src.geometry.Vector import Vector

origin = Vector(0,0)
origin.label = "Origin"

You can use the render function to generate an SVG representation of the geometry

from src.render import render
render(origin)

svg

Shape

A Shape object is defined by multiple points which are joined by line segemnts to create a complicated line or shape.

from src.geometry.Shape import Shape

square = Shape([
  Vector(0, 0),
  Vector(100, 0),
  Vector(100, 100),
  Vector(0, 100),
  Vector(0, 0)]
).with_label("a square").with_style("polygon")

render(square)

svg

Using the style property, a polyline can be rendered as many different kinds of shapes.

from layout import topToBottom

shape = Shape([Vector(0, 0), Vector(100, 50), Vector(200, -50), Vector(300, 0)])

render(
  *topToBottom(
    shape.with_style("line").with_label("line"),
    shape.with_style("dashed").with_label("dashed"),
    shape.with_style("arrow").with_label("arrow"),
    shape.with_style("dashed_arrow").with_label("dashed_arrow"),
    shape.with_style("pointset").with_label("pointset"),
    shape.with_style("polygon").with_label("polygon"),
    shape.with_style("tape").with_label("tape"),
    shape.with_style("ruler").with_label("ruler")
  )
)

svg

You can draw measurement markers along a polyline:

render(
  square,
  *square.evenlySpacedMeasurements()
)

svg

Or automatically detect corners:

corners = square.corners()

render(
  square,
  *[corner.with_label("Here is a corner!") for corner in corners]
)

svg

You can slice out a certain portion of a line:

from layout import process
from src.geometry.Group import Group

P = square.at(25).point.with_label("P")
Q = square.at(175).point.with_label("Q")

render(
  *process(
    Group(
      square,
      P,
      Q,
    ),

    Group(
      square.slice(25, 175),
      P, Q
    )
  )
)

svg

The circle class can be used to generate regular polygons with so many sides they look like a circle:

from src.geometry.Circle import Circle

circle = Circle(Vector(0, 0), 100)
triangle = circle.polyline(3)
hexagon = circle.polyline(6)
almostCircle = circle.polyline(50)

from layout import sideBySide
render(*sideBySide(triangle, hexagon, almostCircle))

svg

We can put this together to get good approximations of measurements along a curve:

arc = circle.polyline(100).slice(0, 150)
render(
  arc,
  *arc.evenlySpacedMeasurements()
  )

svg

Bezier Curves

from src.geometry.Shape import dashed
from src.geometry.bezier import BezierCurve
p0 = Vector(0,0).with_label("p0")
p1 = Vector(0, 50).with_label("p1")
p2 = Vector(50, 50).with_label("p2")
p3 = Vector(50, 100).with_label("p3")


mycurve = BezierCurve(p0, p1, p2, p3)

render(
  mycurve.demo()
  )

svg

Interpolating a Shape with Bezier Curves

myshape = Shape([Vector(0,0), Vector(0, 200), Vector(200,250), Vector(250, 150), Vector(300 , 300)])

render(
  myshape.with_style("dashed"),
  myshape.interpolate(),
)

svg

This makes a lot of points apear, so it might be a good idea to resample the curve at lower resolution:

interpolated = myshape.interpolate()
downsampled = interpolated.resample(25)
render(
  *topToBottom(
    interpolated.with_style("pointset"),
    downsampled.with_style("pointset").with_label("Re-sampled")
  )
)

svg

Demonstrating different curve speeds

gen = [myshape]
for i in range(0, 20):
  next = myshape.interpolate((i+1) / 4)
  gen.append(next)

render(*gen)

svg

Finding the closest point on a polyline

We can find the closest point on a polyline to any given coordinate:

from src.geometry.Shape import dashed_arrow
shape = arc
X = Vector(90, 100)
Y = shape.closestPoint(X)

render(
  shape,
  X.with_label("X"),
  Y.with_label("Y"),
  dashed_arrow(X, Y)
)

svg

You can use closest points in other methods too, such as slice

shape = arc
P = Vector(90, 100).with_label("P")
Q = Vector(100, 0).with_label("Q")
sliced = shape.slice(P, Q)
render(
  *process(
    Group(
      P,
      Q,
      dashed_arrow(P, shape.at(P).point),
      shape.with_label("Original"),
    ),
    Group(
      sliced.with_label("sliced"),
      *sliced.points, P, Q
    )
  )
  )

svg

Replacing a section of a shape

Here are two shapes

a = Shape([Vector(-100, 200), Vector(200, -100)])
b = arc

render(a.with_label("a simple shape"), b.with_label("replacement"))

svg

We can replace a region of one with the other

render(a.replace(b))

svg

Tweening between shapes

Tweening lets you morph one shape smoothly into another:

from src.geometry.tween import tween, tween_demo

a = Shape([Vector(-100, 200), Vector(200, -100)])
b = arc

render(tween_demo(a, b))

svg

A circle becoming a square,

render(tween_demo(square, circle.polyline(100)))

svg

Turtle/Spirograph curves

import math
from src.spirograph import spiro
angle_over_length = lambda x : math.radians(x*.1)
spiral = spiro(angle_over_length, 10000)
render(spiral)

svg

Adding darts

shape = Shape([Vector(0,0), Vector(100, 0)])
shape.addDart(Vector(50, 0), 50, 20)
render(shape)

svg

shape = Shape([Vector(0,0), Vector(0, 100)])
shape.addDart(Vector(0, 50), 50, 20)
render(shape)

svg

Collision detection

Collision detection is powered by the qwertyquerty/collision library.

from src.geometry.Shape import rectangle
example_shape = rectangle(0, 0, 100, 100)
example_points = [Vector(50, 50), Vector(150, 50)]

for p in example_points:
  if example_shape.point_is_inside(p):
    p.label = "Collision!"
  else:
    p.label = "No collision!"

render(example_shape, *example_points)

svg

Lets try something a bit trickier:

from aldrich.tailored_skirt_block import tailored_skirt_block
from src.point_grid import point_grid_over_shape

example_shape = tailored_skirt_block()["back"]

points = []
for point in point_grid_over_shape(example_shape, margin=17):
  if example_shape.point_is_inside(point):
    points.append(point)

render(example_shape.with_style("all_guides"), *points)
  

svg

Triangulation

Turning a polygon into triangles:

render(example_shape.earclip_mesh())
data:application/object;charset=us-ascii;base64,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

svg

Sewing up the darts:

mesh = example_shape.earclip_mesh()
sides = example_shape.sides()
mesh.add_seam(sides[7], sides[8].reverse())
mesh.add_seam(sides[4], sides[5].reverse())
render(mesh)
data:application/object;charset=us-ascii;base64,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

svg

Die Lemma dress block

One of the main applications of this library is to create outfits for East London drag queen Die Lemma.

A dress block for Die was created and digitised into this library:

from DieLemmaDressBlock import DieLemmaDressBlock

render(DieLemmaDressBlock)

svg

Drawing parallels to a complex polyline:

render(
  DieLemmaDressBlock,
  DieLemmaDressBlock.parallel(50),
  *[dashed_arrow(P, Q) for P,Q in zip(DieLemmaDressBlock.points, DieLemmaDressBlock.parallel(50).points)],
  *DieLemmaDressBlock.points
)

svg

or drawing inside the shape instead of outside,

render(
  DieLemmaDressBlock,
  DieLemmaDressBlock.parallel(-25),
  *[dashed_arrow(P, Q) for P,Q in zip(DieLemmaDressBlock.points, DieLemmaDressBlock.parallel(-25).points)],
  *DieLemmaDressBlock.points
)

svg

Winnifred Aldrich pattern blocks

One application of this library is quickly producing pattern blocks from Winnfred Aldrich’s book. To do that, we have to be able to use describe body measurements:

from src.sizing.BodyMeasurements import example_body_measurements
print(example_body_measurements)
Size 24.74583333333333:
	waist	= 725.0mm	(-297.4mm)
	hips	= 900.0mm	(-338.6mm)
	waist_to_hip	= 265.0mm	(+39.9mm)
	body_rise	= 340.0mm	(+8.3mm)
	bust	= 1182.4mm
	low_waist	= 1122.4mm
	back_width	= 417.2mm
	chest	= 414.7mm
	shoulder	= 140.1mm
	neck_size	= 443.2mm
	dart	= 108.2mm
	top_arm	= 379.5mm
	wrist	= 196.6mm
	ankle	= 276.6mm
	high_ankle	= 246.6mm
	nape_to_waist	= 435.5mm
	front_shoulder_to_waist	= 462.4mm
	armscye_depth	= 240.2mm
	waist_to_knee	= 616.9mm
	waist_to_floor	= 1103.7mm
	sleeve_length	= 608.4mm
	sleeve_length_jersey	= 568.4mm
	cuff_size_shirts	= 241.9mm
	cuff_size_two_piece_sleeve	= 153.4mm
	trouser_bottom_width	= 251.9mm
	jeans_bottom_width	= 210.0mm

Trouser block

from TheClassicTailoredTrouserBlock import TheClassicTailoredTrouserBlock

render(TheClassicTailoredTrouserBlock())

svg

Skirt block

from aldrich.tailored_skirt_block import tailored_skirt_block

render(tailored_skirt_block())

svg

Here it is with the seam and hems marked,

from aldrich.tailored_skirt_block import tailored_skirt_pattern

render(tailored_skirt_pattern())
Warning: creating french seam on two lines with different length: 612.9753811041546 and 613.3124368403252

svg

I’m planning a long flared skirt.

render(tailored_skirt_pattern(skirt_length=940, flare=1.4))
Warning: creating french seam on two lines with different length: 958.9489488731247 and 959.2860046092952
Warning: creating french seam on two lines with different length: 958.9489488731247 and 959.2860046092952

svg

Working in 3D

Turn a 2d shape into 3d one (and back again to render it):

import numpy as np
square3d = square.to_3D()

render(
  *[
    square3d.rotate(pitch=angle).isometric() for angle in np.arange(0, 6.28, 0.3)
    ]
)

svg

Tweening radially,

shape_1 = Shape([Vector(0,0), Vector(50, -100)])
shape_2 = Shape([Vector(0,0), Vector(50, -15), Vector(50, -200)])

render(*[
  tween(shape_1, shape_2, phase).to_3D().rotate(pitch=phase * 3.14).isometric() for phase in np.arange(0, 1, .05)
])

svg

The Mesh class

For cloth simulation, we need to create a triangular mesh:

from src.geometry.Mesh import mesh_grid

render(mesh_grid(300, 300))
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

svg

Interupting the mesh with a new point:

my_mesh = mesh_grid(300, 300)
my_mesh.interupt_point((105, 115))
render(my_mesh)
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svg

I want to sew the sides of this together to make a tube.O

tube = mesh_grid(300, 300)
left_side = Shape([Vector(0,0), Vector(0, 250)])
right_side = Shape([Vector(250,0), Vector(250, 250)])
tube.add_seam(left_side, right_side)
render (tube)
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f 188 109 110
f 188 186 110
f 189 119 120
f 189 187 120
f 189 119 106
f 189 187 106
f 190 122 109
f 191 132 119
f 191 119 118
f 192 121 122
f 192 190 122
f 193 131 132
f 193 191 132
f 193 131 118
f 193 191 118
l 1 145
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svg

Making a skirt for myself

I would like a skirt. To get one, I’ve measured my body a little bit:

joelle_waist = 725
joelle_hips = 900
joelle_waist_to_hips = 265

I’ve also decided a few dimensions of the skirt I’d like to make:

skirt_length_below_the_hips = 380
skirt_bottom_circumference = 1200

Here is a graph plotting the circumference of the skirt over height:

from src.geometry.Shape import measurement_from_y_axis
skirt_circumference_graph = Shape()

origin = Vector(0,0)
waist_point = Vector(joelle_waist, 0)
hips_point = Vector(joelle_hips, -joelle_waist_to_hips)
hem_point = Vector(skirt_bottom_circumference, -joelle_waist_to_hips - skirt_length_below_the_hips)

skirt_circumference_graph.lineTo(waist_point)
skirt_circumference_graph.lineTo(hips_point)
skirt_circumference_graph.lineTo(hem_point)

render(
  skirt_circumference_graph.close_against_y_axis(),
  origin,
  measurement_from_y_axis(waist_point),
  measurement_from_y_axis(hips_point),
  measurement_from_y_axis(hem_point)
  )

svg

This is the circumference of the skirt over elevation. But I think what I need (in order to get the scrolled hem I’m looking for) is the radius. To keep it simple I’ll imagine the skirt as a circlular prism with radius varying across its length.

skirt_radius_graph = Shape([Vector(p.x / (2*math.pi),  p.y) for p in skirt_circumference_graph.points])
render(skirt_radius_graph)

svg

This is a reasonable approximation for the silhouette of the skirt.

Now I’ll add the scroll

skirt_radius_graph.continue_with_arc(175, 2*math.pi)
render(skirt_radius_graph)

svg

Here’s what it should look like in 3d:

render(*[
  skirt_radius_graph.to_3D().rotate(pitch=angle).isometric() for angle in np.arange(0, math.pi*2, .1)
])

svg

Now I’ve found a silhouette I like, I’ll unwrap this by length onto the y-axis.

final_radius_graph = Shape()
for w in np.arange(0, skirt_radius_graph.length, 10):
  x = skirt_radius_graph.pointAlong(w).x
  p = Vector(x, -w)
  final_radius_graph.lineTo(p)
render(final_radius_graph.close_against_y_axis())

svg

Next we transform this back into a circumference graph

final_circumference_graph = Shape(
  [Vector(x = p.x * 2*math.pi, y=p.y) for p in final_radius_graph.points]
)

render(final_circumference_graph.close_against_y_axis())

svg

Wow mad. Finally, lets subdivide this into 10 pattern pieces:

pattern_shape = final_circumference_graph.close_against_y_axis().subdivide_by_width(10)
render(pattern_shape)

svg

Now I just need to add some seam & hem allowances. While I’m at it, I’ll make a pattern for the boning channel.

from src.geometry.Shape import rectangle

pattern_piece = Group(
  shape=pattern_shape,
  right_side = pattern_shape.sides()[0].with_style("line"),
  left_side = pattern_shape.sides()[2].with_style("line").reverse(),
  right_allowance = pattern_shape.sides()[0].allowance(-20),
  left_allowance = pattern_shape.sides()[2].allowance(-20),
  center_line = pattern_shape.vertical_center_line(),
)

boning = rectangle(pattern_shape.x_center() - 6, pattern_shape.bottom, 12, pattern_shape.height).with_label("12mm boning channel")

render(
  *sideBySide(
    pattern_piece,
    Group(
      boning,
      boning.allowance(-12)
    )
  )
)

svg

Here is a demo of the construction in 3D:

pattern_piece_3d = pattern_piece.to_3D()
pieces = []
for phase in np.arange(0, 1, 1.0/10.0):
  pieces.append(pattern_piece_3d.translate(z=1000).rotate(pitch=phase * 2 * math.pi).isometric())

from src.geometry.seam_lines import seam_lines

all = []
for i in range(len(pieces)):
  a = pieces[i]
  b = pieces[(i+1)%len(pieces)]
  all.append(a)
  all.append(seam_lines(a["left_side"], b["right_side"]))

render(*all)

svg

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