Freehand Drawing guided by Geometric Reasoning
The GreasePad provides a drawing area and expects pen strokes as the only user input. These strokes are approximated by straight line segments leading to line drawings. During this interactive process, geometric relations such as orthogonallity are recognized and automatically enforced by an adjustment procedure. The program can be utilzed to analyse systems of straight lines and constraints (theorem proving) or to outline the shapes of human-made objects in images. As an input pointing device, you can use a computer mouse, a stylus, or one of your fingers in combination with a touchscreen.
Copyright (C) 2022 Jochen Meidow, Fraunhofer IOSB, Germany.
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see https://www.gnu.org/licenses/.
For the compiliation and building of the programme, the following components are required:
- The C++ template library Eigen, version 3.4.0, for linear algebra, i.e, matrices, vectors, numerical solvers, and related algorithms.
- The widget toolkit Qt, version 5.11.0, for creating the graphical user interface.
- Get the Qt toolkit and the Eigen library.
- Clone the source code, i.e.,
git clone www.github.com/FraunhoferIOSB/GreasePad.git - Building the programme, e.g., using the integrated development environment QtCreator.
The software is still under development. Contributions in form of issues and pull requests are highly welcome.
Details on the utilized methods can be found in the following papers:
- J. Meidow and L. Lucks (2019) Draw and Order - Modeless Interactive Acquisition of Outlines. ISPRS - Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences, vol. IV-2/W7, pp. 103-110
- J. Meidow, H. Hammer, and L. Lucks (2020) Delineation and Construction of 2D Geometries by Freehand Drawing and Geometric Reasoning. ISPRS - Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, vol. V-5-2020, pp. 77-84
Please cite these papers when using GreasePad or parts of it in an academic publication.
Jochen Meidow, Fraunhofer IOSB, Ettlingen, Germany.