Converting IGES Line Styles
The IGES specification includes six standard line styles and custom line font patterns defined by line font definition entities (type 304).
Because OpenCities Map does not support custom line styles, the IGES line font patterns of entities with custom line font patterns can be mapped to any of the OpenCities Map line styles.
For IGES import, the default mapping of IGES line font patterns to OpenCities Map line styles is:
| IGES line font pattern | OpenCities Map line style |
|---|---|
| 0. Undefined | 0. Solid (SOL) |
| 1. Solid | 0. Solid (SOL) |
| 2. Dashed | 5. Short-dashed (SHD) |
| 3. Phantom | 6. Dash double-dot (DADD) |
| 4. Centerline | 7. Long dash-short dash (LDSD) |
| 5. Dotted | 1. Dotted (DOT) |
For IGES export, the default mapping of OpenCities Map line styles to IGES line font patterns is:
| OpenCities Map line style | IGES line font |
|---|---|
| 0. Solid (SOL) | 1. Solid |
| 1. Dotted (DOT) | 3. Phantom |
| 2. Medium-dashed (MEDD) | 2. Dashed |
| 3. Long-dashed (LNGD) | 2. Dashed |
| 4. Dot-dashed (DOTD) | 4. Centerline |
| 5. Short-dashed (SHD) | 2. Dashed |
| 6. Dash double-dot (DADD) | 3. Phantom |
| 7. Long dash-short dash (LDSD) | 4. Centerline |
Conversion between OpenCities Map line styles and IGES line font patterns can be customized:
- For import — see the Import IGES File dialog
- For export — see the Export IGES File dialog