This site holds some Gimp2 plugins.
Note: The plugins are written for Gimp2. They do not work for Gimp3 unless somebody ports them.
The plugins fall in the following categories:
General-purpose plugins |
Parametric curve (cartesian) Parametric curve (polar) Parametric curve (read function from file) |
Some specific curves |
Fourier3 with control of symmetry Fourier3 Lissajous Rhodonea Simple harmonograph Spiropath |
Transform a path by an affine map | Very basic plugin: affine transformations on Bézier curves. |
Transform a path by a Bézier arc | A path is transformed by a conformal map constructed from a user-supplied Bézier arc. |
Transform a path by a Moebius map |
A path is transformed by a Möbius map. Actually there are four plugins; three are designed to allow the user to control the pole and/or the inverse pole. |
Transform a path by a Bezier arc quadrilateral | A path is transformed by a conformal map constructed from a user-supplied Bézier path (curved quadrilateral). In fact, two plugins, easy and advanced. |
Fit a path in a triangle | A path is translated and fitted in a given triangle without rotations or distortions. |
Fit a path in a convex quadrilateral | A path is fitted in a given convex quadrilateral via a projective transformation, so distorted. |
Convert a path to polar coordinates | An analog of Gimp's filter Image>Distorts>Polar coordinates but working with paths instead of images. |
Transform a path by exponential map | A path is transformed by the complex exponential map, viewing the plane as the complex number plane. |
Crop path by circle | Crop a path by a circle, given as a path (either a diameter or the center and one point). |
Crop path by convex polygon |
Crop a path by a convex polygon, given as a path. |
Crop path by general selection | Crop a path by a general selection (not necessarily rectangular). May be slow. |
Crop path by rectangle |
Crop a path by a rectangle, such as a rectangular selection (or one of three more choices). |
Slice path by guides |
Slice a path by guides. |
Slice path by lines | Slice a path by straight line segments, given as strokes of another path. |
Bounding box |
Draw the bounding box of a path. |
Common tangent or normal between two paths | Draw one common tangent or normal between two paths. The user gives a line segment close to where the drawn tangent/normal should be. |
Parallel tangents or normals |
Draw tangents or normals to a path, parallel to a given line segment. |
Tangents or normals from a point |
Draw tangents or normals to a path from a point. The user inputs a line segment with one end at that point and the other end near that path, and the plugin snaps one end of the line segment to a tangent or normal. |
Tangents or normals from a stroke end of another path | Similar as above except that instead of a point some stroke end of another path is used. The user inputs a line segment with one end near that path and the other end near that other path, and the plugin snaps both ends of that line segment. |
Perspective transform - 4 points to
4 points |
The transformation is defined by means of two 4-anchor paths: the anchors of one path are mapped onto the anchors of the second. |
Perspective transform - 4 points to rectangle corners |
Corrects quadrangles to rectangles. The transformation is defined by a 4-anchor path and a rectangle: the area inside the path is mapped onto the rectangle. |
Perspective transform - 4 points to circle (clock face) |
Corrects distorted circles to true circles. The transformation is defined by a 4-anchor path and a list of four hours on an imaginary clock face. |
Perspective transform - 2+2+2 points to circle (3 diameters) |
Corrects distorted circles to true circles. The transformation is defined by three paths showing three would-be diameters: the line segments that should become diameters of the corrected circle. |
Perspective transform - 1+2+3 points to circle (center and 2+3 points) | Otherwise as the plugin above but the input is three paths: a 1-anchor path (the would-be center); a 2-anchors path (2 points on the distorted circle); a 3-anchors path (3 points on the distorted circle). |
Warp a path locally | Warp a path inside a given circle. Three possible actions: Grow, Shrink, and Swirl. |
Simplify a path | Diminish the number of anchors allowing some smoothing. |
Round path corners | Given a path consisting of straight line segments, round its corners. |
Simple smooth path | Given a path consisting of straight line segments, construct a smooth path passing through the same anchors. A simple algorithm. |
G2-continuity | Given a path, make a G2-continuous path through its anchors. This is another smoothing tool. |
Join strokes | Join close ends of the strokes of a path |
Chop a path at its anchors |
All strokes will be 2-anchor strokes |
Chop a path by another path |
The strokes are chopped at the intersection points with another given path |
Chop a path by lengths | From the strokes are chopped pieces of equal lengths |
Replicate path
along circle |
Replicate a path following a circle (or circle sector), optionally distorting the path to follow the circular arc. |
Replicate path along another path | Replicate a path following strokes of another path, optionally distorting to follow the arc, and optionally tapering. |
Replicate path by affine mapping |
Replicate a path by applying an affine transformation repeatedly. |