operator [] abstract method
A coordinate value by the coordinate axis index.
Returns zero when a coordinate axis is not available.
For 2D coordinates the coordinate axis indexes are:
| Index | Projected | Geographic |
|---|---|---|
| 0 | x | lon |
| 1 | y | lat |
| 2 | m | m |
For 3D coordinates the coordinate axis indexes are:
| Index | Projected | Geographic |
|---|---|---|
| 0 | x | lon |
| 1 | y | lat |
| 2 | z | elev |
| 3 | m | m |
Implementation
num operator [](int index);