04-22-2020, 12:27 PM
In post #1 I explained how to get the three plugins. Now I talk about the one called
Transform a path by an affine map
The plugin performs an affine mapping. (Nothing new there; Gimp's standard tools do the same.) To define the map, you must provide two auxiliary paths; I call them the Base and the Target. I show a picture:
On the left are the original input paths. The Path is the path to be transformed. The Base and the Target are two three-anchor paths. They define the affine map: It is the map which sends the three anchors of the Base to the three anchors of the Target. On the right is the result. (The example also shows my artistic level.)
If you happen to draw the Base and the Target in the wrong way, one from the left to the right and the other in the opposite direction and if that was not intentional, you can make the plugin to use the reversed version of the Base.
This all is very basic. An affine map does nothing very dramatic. One case where this plugin may be nicer to use than the standard tools, is if you need to transform several paths by the same affine map: you can use the same Base and Target repeatedly.
In the example above, the Base has three anchors. You can instead use a path with two or one anchors. If it has two anchors, the map will be a direct similitude (mapping the Base to the Target). If there is only one anchor, the map will be a translation. The Target, on the other hand, must have at least as many anchors as the Base has.
Transform a path by an affine map
The plugin performs an affine mapping. (Nothing new there; Gimp's standard tools do the same.) To define the map, you must provide two auxiliary paths; I call them the Base and the Target. I show a picture:
On the left are the original input paths. The Path is the path to be transformed. The Base and the Target are two three-anchor paths. They define the affine map: It is the map which sends the three anchors of the Base to the three anchors of the Target. On the right is the result. (The example also shows my artistic level.)
If you happen to draw the Base and the Target in the wrong way, one from the left to the right and the other in the opposite direction and if that was not intentional, you can make the plugin to use the reversed version of the Base.
This all is very basic. An affine map does nothing very dramatic. One case where this plugin may be nicer to use than the standard tools, is if you need to transform several paths by the same affine map: you can use the same Base and Target repeatedly.
In the example above, the Base has three anchors. You can instead use a path with two or one anchors. If it has two anchors, the map will be a direct similitude (mapping the Base to the Target). If there is only one anchor, the map will be a translation. The Target, on the other hand, must have at least as many anchors as the Base has.