Sequence2points
geometric-functions sequence2points
syntax
- sequence2points(arc_polygon_data_item)
definition
sequence2points(arc_polygon_data_item) results in a new domain-unit with all points from the arcs/polygons of the arc_polygon_data_item
The function generates three subitems:
- Point: a data-item with the points of all arcs/polygons of the arc_polygon_data_item
- SequenceNr: a relation towards the domain unit of the arc_polygon_data_item
- Ordinal: a uint32 data item with the order of each point in the arc_polygon_data_item
applies to
data item arc_polygon_data_item with fpoint or dpoint value-type and composition type arc or polygon.
example
unit<uint32> RoadPointSet := sequence2points(road/geometry);
| road/geometry |
|---|
| {2 {399246, 112631}{398599, 111866}} |
| {3 {398599, 111866}{399495, 111924} {401801,111524}} |
| {2 {401529, 114921}{398584, 114823}} |
domain Road, nr of rows = 3
| point | SequenceNr | Ordinal |
|---|---|---|
| {399246, 112631} | 0 | 0 |
| {398599, 111866} | 0 | 1 |
| {398599, 111866} | 1 | 0 |
| {399495, 111924} | 1 | 1 |
| {401801, 111524} | 1 | 2 |
| {401529, 114921} | 2 | 0 |
| {398584, 114823} | 2 | 1 |
domain RoadPointSet, nr of rows = 7