They can be invoked in Gimp's Paths tab: right-click the path you want to transform, and at the bottom of the opening window followĪnd you will see three plugins to choose from. That registers three plugins in your Gimp. py file in your Gimp's plug-ins folder and restart Gimp.
#Gimp 2.8 download older simpler version zip file#
zip file containing one file path_transformations.py. There is a Download button, and it gives you a. , well, I doubt if it is worth publishing after all, and perhaps it will be removed in later versions.Īnd scroll down to the bottom. Number 1 does nothing new, and number 3 is.
#Gimp 2.8 download older simpler version code#
Perhaps I should only say that to me number 2 is the only interesting.) What I myself have in mind is that the code of this plugin will serve as the body where I shall add an approximation algorithm (don't know yet how). (But then when I ever try to guess what people will find interesting, I go astray. Of the three I expect number 2 to be the only one interesting. (Actually I call the deforming "curling".) Number 3 is just a variation of number 2. Deforming a polyline, segment by segment, with a transformation as in number 2. This all I shall explain in detail in a later post.Ī3. A different arc will give a different transformation.
The transformation is in a certain manner constructed from a user-supplied Bézier arc (a path with two anchors). The path to be transformed is what I call a line figure: a path consisting of straight line segments (for example a lattice or a grid). Transforming a line figure by a transformation constructed from a Bézier arc. Very elementary, and the reason why I made the plugin is that I may need affine maps later in my project, and certainly I need similarity maps.Ģ. My plugin gives a different interface: not WYSIWYG, no moving of points on the screen with the mouse, nothing fancy. Nothing new here, of course, since Gimp's own transformation tools do affine maps on paths. Here is a quick overview of the plugins:ġ. My time is nowadays rather limited, and I think this will take perhaps a week. Of each of the three plugins I shall soon make a special introductory post. These plugins deal with cases where no approximation is needed, so the results are exact. Hence, there needs to be an approximation.Īnyway, as a preliminary step I wrote the three plugins. The problem in transforming a path (for example by a Möbius transformation or such) is different from transforming an image since the input is control points of Bézier curves and the result must again be represented as Bézier curves. But if I am wrong, and if they (or some other existing plugin) can be applied to paths, I hope that somebody tells me so that I shall not work in vain. I have not tried those, but it is my guess that they transform images, not paths. I know that there are already transformations to deform images. My long-range aim is to try to make plugins that transform Gimp paths by certain more interesting (conformal) maps. They are the first step in my current project, and I paused my work to make them into plugins. They are about transformations of Gimp's paths.
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