InkStitch - fills with programmable stitches

Objectives

• Create non-standard fill patterns with Inkscape Digitize path created with Inkscape

Prerequisites

• Inkscape
• InkStitch - basic use‎‎

See also

• Computerized embroidery

• Quality: draft

• Difficulty: intermediate

Draft

Introduction

Ink/Stitch, as of summer 2018, provides support for four Embroidery stitch types: Lines, satin columns, tatami fills and manual stitches. Some embroidery software suites offer the possibility to fill in polygons with so-called programmable or speciality stitches, e.g. radial fills, hatches, little objects etc.

Ink/Stitch does not plan to includes these in the near future. However, some InkScape extension allow to do non standard fills. However, as we first shall explain, the standard default pattern fill does not work, since it cannot be translated to paths (unless there is a way we could not identify).

Using InkScape Patterns - does not work

According to avmjong Bah's Inkscape manual, Any object or set of objects can be turned into a Pattern and used in the fill of an object. The Pattern can be shifted, rotated, and stretched as necessary. Inkscape includes a set of Patterns accessible through the Fill and Stroke dialog. One either can use built-in patterns or use your own ones.

Unfortunately, there is no way to translate a fill with pattern to paths since the pattern is considered a color. And, of course, Ink/stitch cannot handle colors as paths. The only workaround we can envision (but we will have to test this) is to export to illustrator or creating a bitmap that we can then could trace.

Traceback (most recent call last):
  File "inkstitch.py", line 20, in <module>
    if script_name.endswith('.py'):
  File "inkscape-0.92.2/share/extensions/inkex.py", line 283, in affect
  File "lib/extensions/embroider.py", line 84, in effect
  File "lib/stitch_plan/stitch_plan.py", line 28, in patches_to_stitch_plan
  File "lib/stitch_plan/stitch_plan.py", line 168, in color
  File "lib/threads/color.py", line 17, in __init__
ValueError: Invalid color: 'url(#pattern5514)'

Other extensions, e.g. Generate from path -> Voronoi pattern are also using patterns as colors and cannot be used either.

Inkscape fill patters cannot be translated to paths and therefore cannot be stitched with Ink/Stitch

However, this can be achieved manually as we shall explain below.

Using tiled clones and path division

Instead of using pattern fills to fill a shape with patterns, we can multiply a pattern manually and then subtract it from the shape. The procedure is a bit tedious and requires some planning if you don't want to redo operations. However, it seems to be fairly simple. Basically one creates a pattern shape larger than the shape that should be filled and then use this shape to cut out a same shape from the pattern shape. Glance a at the figures below.

Let us fill a heart with little hearts.

Step 1: Create the big heart shape

• We just imported this heart from the noun project (this is public domain)
• Change dimensions to 5cm width
• Remove the fill and create a 2.5mm border
• Save the "file as" version 1 to continue (you will need to retrieve the shape after step 3)

Step 2: Create a an area with small hearts that are all connected.

• Create a little heart, remove the fill and make the border dotted. We use the same object and make a 0.5 width heart. In order to have a sufficiently large pattern to subtract from the heart, we cloned it 11 X 11 times.

• Select the little heart
• Edit -> Clone -> Create Tiled Clones.
  • Set 12 rows, 12 columns
  • In the Shift tab, create alternate X shifts of 10mm, that is 20%.
  • Alternatively we could have shifted 2.5cm plus some shifting in the Y direction.
  • Remove the original heart in position 1,1. In the object manager (Object->Objects) you only should see "use" objects
  • "Save file" as version 2
  • Select all the little hearts and combine (CTRL-K), i.e. make a single path

After Steps 1 and 2: A heart plus tiled little hearts (not yet combined)

Step 3: Fill the big heart with the little ones.

• Move the tiles underneath the heart
• Select both the tiles and the big heart (in any order) and Path -> Division
• You now will see a big rather black heart
• Select all the objects and set stroke style to small and dotted
• "Save file as" version 3
• Combine these (again), CTRL-K. Depending on your patterns this may not be a good idea, since InkStitch may not know how to route overlapping patterns. If this is the case, then don't combine.

After Step 3: A heart-shaped path fill

Step 4: Add the big heart again and make it satin

• Open the first file version and copy / paste in place the big heart.
• Make sure that you are happy with the border width.
• Path-> Stroke to Path
• Remove Fill
• Add a small stroke, e.g. 0.2 mm
• Make it satin, i.e. add direction lines to the rails or make the points even (read InkStitch - from satin columns to fills with satin borders) if you don't understand this. In particular, make sure that both rails have the same direction, cut both rails if necessary (I had to).

Step 5: Parametrize

• A satin stitch with underlay for the big heart
• A bean stitch for the fill pattern.
• Define a color for each object.

SVG file for download

Simulation (jump stitches do not show in the same place as Ink/Stitch)

To improve:

• Do something about the big jump stitches. On a multi-needle machine, one simple could keep each little heart apart, then add trims.

GCode tools

Gcode tools allow to create drawings that are popular with many CNC machines, and 3D printers in particular. The result is not particularly interesting, we believe for now.

Step by step:

• Select a shape
• Remove the fill (unless you plan to stitch two layers
• Gcodetools -> Area or Fill Area or Area Artifacts
• Parametrize
• Break à part the result
• Verify each path and kill the tiny ones.

Eggbot

Eggbot tools have been developed for so-called Egg-bots, machines can draw and engrave on egg-like shapes.

This extension needs to installed.

• Get it from EggBot's github site
• Follow the instructions

Hatching

You can easily create diagonals and cross-stitches. For both you got the option to connect the ends, which we recommend.

Creating a cross stitch with connected endings

Below are two different combinations of hatching

• Top left: connected hatches
• Top right: unconnected hatches
• Lower left: connected cross-stitch hatches
• lower right: unconnected cross-stitch hatches

Hatch fills create with eggbot

As of July 2018 (Inkscape 0.92.3 and InkStitch 1.13), some of the parameter combinations stitch very well, others less, others make Inkscape crash on my Linux machine (but not on one of my Windows laptops). Always used connected hatches. As you can see in the simulation below, unconnected hatches create weird jump stitches.

Hatch fills create with eggbot - Stitch plan with some weird jump stitches

Here is a quick result:

To improve:

• lettering
• satin stiches should have some rungs to optimize corners, and another lighter underlay.

Other example:

• InkStitch - data visualization

Streaks

The Streaks extension allows to fill rectangles with random streaks. We suggest, however, not using dots...

• Download both the *.inx and *.py files and copy to the extensions folder
• The extension will appear in Extensions -> Examples