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Embroidermodder / libembroidery

Library for reading/writing/manipulating machine and design embroidery files
https://www.libembroidery.org
zlib License
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Command: Guilloche (Generates Guilloche patterns) #150

Open robin-swift opened 2 years ago

robin-swift commented 2 years ago

Copied from old to do list.

tatarize commented 2 years ago

This idea properly belongs in Embroidermodder.

From my investigations of this idea, the modern algorithms for Guilloche patterns absolutely does comport well with embroidery. But, in this case we're talking about things like step-repeat patterns to fill a curve between a cycloid with period of turn/5 and another with a period of turn/7 following a sine wave between the two boundary conditions.

http://www.excourse.com/excentro/ is one of the best programs for this, and shows the typical UI this involves. It requires a series of shapes that are blended together in various ways with particular effects.

(Defunct Online Guilloche) 1d912ada641edd08a756c35d9e522216

Basically you define a tree of different shapes descending from a base shape which is usually like a circle. Then you add to that circle an effect like a sine-wave, saw-tooth, or cycloid (dot rolling on a circle, rolling on the shape in question). You then calculate the position by figuring the location you would between 0,1 and shoe-horning that between the various other bases and effects, which form the envelope.