LGS 2D software

A sample sketching application called Lege'n'd 2D is available as a free download at the LEDAS web site with a set of representative examples of different industrial sketches. This application can be used by anyone to test functionality, robustness and performance of LGS 2D. It was created with the Open CASCADE open-source application framework. The source code of Lege'n'd 2D is available under special request.

LGS 2D is a cross-platform software package. It is a set of binary libraries that runs under all 32- and 64-bit Windows, Linux, *BSD, AIX, HP-Unix, Sun Solaris, MacOS and other OS. Coded in C++, LGS 2D has an API declared in pure C to be integrated into a broad range of software applications. LGS 2D can be used as a self-supporting component, or jointly with LGS 3D version. Both 2D and 3D versions have similar API, providing a complete parametric solution for all aspects of CAD/CAM/CAE system functionality - from 2D sketching to history-free parametric 3D modeling, assembly design, kinematic simulation, etc.

LGS 2D supports creation and modification of the geometric models by means of (explicit or implicit) constraints. Typical geometric objects are points, lines, circles, or black-box parametric curves. Objects can be fixed in the absolute coordinate system or with respect to each other (the latter feature is provided by the so-called rigid sets of objects). A set of geometric constraints includes logical constraints between geometric entities (like coincidence, parallelism, tangency, etc.), and dimensional constraints (that specify the required values for the given distances, angles or radii). LGS 2D also supports user-defined variables, algebraic and black-box equations, and tabular constraints that can be arbitrarily mixed with geometric dimensions. LGS 2D moves and rotates objects to positions where all constraints are satisfied with minimal possible transformations of the initial configuration. LGS 2D is a simultaneous solver: it can solve cyclic dependencies between constraints. Both under-constrained and over-constrained models can be efficiently solved. Additional features of LGS 2D are dynamic constraint solving (while dragging an object) and redundant/inconsistent constraint diagnostics.

LGS 2D is a computational module engineered to support two-dimensional parametric sketching/drawing in CAD and computer graphics systems, as well as any other application that requires parametric connections or constraints to be set between geometrical objects.