Tool Convex Hull
Implementation of 'Andrew's Monotone Chain Algorithm' for convex hull construction.
References:
Algorithmist (2011): Monotone Chain Convex Hull. algorithmist.com.
Andrew, A.M. (1979): Another Efficient Algorithm for Convex Hulls in Two Dimensions. Info. Proc. Letters 9, pp.216-219.
Sunday, D. (2001-2006): The Convex Hull of a 2D Point Set or Polygon. Softsurfer.com.
- Author: O.Conrad (c) 2011
- Menu: Shapes|Tools
Parameters
| | Name | Type | Identifier | Description | Constraints |
|---|
| Input | Points | Shapes (input) | SHAPES | - | - |
| Output | Convex Hull | Shapes (output) | HULLS | - | - |
| Minimum Bounding Box (*) | Shapes (optional output) | BOXES | - | - |
| Options | Hull Construction | Choice | POLYPOINTS | This option does not apply to simple point layers. | Available Choices:
[0] one hull for all shapes
[1] one hull per shape
[2] one hull per shape part
Default: 1 |
| (*) optional |
Command-line
Usage: saga_cmd shapes_points 12 [-SHAPES <str>] [-HULLS <str>] [-BOXES <str>] [-POLYPOINTS <str>]
-SHAPES:<str> Points
Shapes (input)
-HULLS:<str> Convex Hull
Shapes (output)
-BOXES:<str> Minimum Bounding Box
Shapes (optional output)
-POLYPOINTS:<str> Hull Construction
Choice
Available Choices:
[0] one hull for all shapes
[1] one hull per shape
[2] one hull per shape part
Default: 1