# Difference between revisions of "Lib2geom"

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− | + | == What is lib2geom? == | |

− | [ | + | [https://gitlab.com/inkscape/lib2geom lib2geom] (2Geom in private life) was initially a library developed for Inkscape, but it can provide a robust computational geometry framework for any application. It is not a rendering library, instead concentrating on high level algorithms such as computing arc length. |

− | + | == Design Decisions == | |

+ | * Small, algebraic objects (Point/Matrix) will be mutable, whereas large objects like a pathset will be immutable. <justification here> | ||

+ | * We are using an original development method we've dubbed "Toy Driven Development". Under this process graphical toys are implemented which allow playing with the features of the library. | ||

− | + | == Quick Feature List == | |

− | [[lib2geom py2geom]]: | + | (not complete) |

+ | |||

+ | * C++ | ||

+ | * Functional programming style. | ||

+ | * Points | ||

+ | * Efficient affine transformations | ||

+ | * Rectangles | ||

+ | * Convex Hulls | ||

+ | * Bounded error | ||

+ | * General purpose paths: | ||

+ | ** Exact elliptical arcs | ||

+ | ** Area | ||

+ | ** Centroid and bending moments | ||

+ | * Path Locations: | ||

+ | ** Determination of special spots (e.g. maximum curvature) | ||

+ | ** Splitting | ||

+ | ** Point, tangent, curvature at location | ||

+ | ** Efficient arc length and inverse arc length | ||

+ | * Path algebra: | ||

+ | ** Computations such as offset curves can be written with their mathematical definition and still get a bounded error, efficient curve. (preliminary trials indicate offset done this way out performs the method used in Inkscape) | ||

+ | * Arbitrary distortion (with bounded error): | ||

+ | ** Mesh distorts | ||

+ | ** Computational distorts such as the GIMP's 'vortex' plugin | ||

+ | ** 3d mapping (perspective, flag, sphere) | ||

+ | * Exact boolean ops (elliptic arcs remain elliptic arcs) | ||

+ | * Efficient 2d database | ||

+ | * Implicit function plotting | ||

+ | * NURBs input and output | ||

+ | * Tunable path simplification | ||

+ | * PDoF constraint system for CAD/CAGD | ||

+ | |||

+ | |||

+ | |||

+ | == Links == | ||

+ | |||

+ | [[WorkingWith2GeomFAQ]]: real-life questions answered about using <code>2Geom</code> in real code | ||

+ | |||

+ | [[lib2geom py2geom]]: Python bindings to <code>2geom</code>. With this you can use the power of <code>2geom</code> in Python scripts. | ||

+ | |||

+ | https://sourceforge.net/p/lib2geom/wiki: 2geom wiki site on SourceForge (obsolescent) | ||

+ | |||

+ | https://gitlab.com/inkscape/lib2geom/: Official source code for the project |

## Latest revision as of 00:54, 12 November 2018

## What is lib2geom?

lib2geom (2Geom in private life) was initially a library developed for Inkscape, but it can provide a robust computational geometry framework for any application. It is not a rendering library, instead concentrating on high level algorithms such as computing arc length.

## Design Decisions

- Small, algebraic objects (Point/Matrix) will be mutable, whereas large objects like a pathset will be immutable. <justification here>
- We are using an original development method we've dubbed "Toy Driven Development". Under this process graphical toys are implemented which allow playing with the features of the library.

## Quick Feature List

(not complete)

- C++
- Functional programming style.
- Points
- Efficient affine transformations
- Rectangles
- Convex Hulls
- Bounded error
- General purpose paths:
- Exact elliptical arcs
- Area
- Centroid and bending moments

- Path Locations:
- Determination of special spots (e.g. maximum curvature)
- Splitting
- Point, tangent, curvature at location
- Efficient arc length and inverse arc length

- Path algebra:
- Computations such as offset curves can be written with their mathematical definition and still get a bounded error, efficient curve. (preliminary trials indicate offset done this way out performs the method used in Inkscape)

- Arbitrary distortion (with bounded error):
- Mesh distorts
- Computational distorts such as the GIMP's 'vortex' plugin
- 3d mapping (perspective, flag, sphere)

- Exact boolean ops (elliptic arcs remain elliptic arcs)
- Efficient 2d database
- Implicit function plotting
- NURBs input and output
- Tunable path simplification
- PDoF constraint system for CAD/CAGD

## Links

WorkingWith2GeomFAQ: real-life questions answered about using `2Geom`

in real code

lib2geom py2geom: Python bindings to `2geom`

. With this you can use the power of `2geom`

in Python scripts.

https://sourceforge.net/p/lib2geom/wiki: 2geom wiki site on SourceForge (obsolescent)

https://gitlab.com/inkscape/lib2geom/: Official source code for the project