samples:samples:addlayer
Table of Contents
AddLayer sample
Documentation | Samples | AddLayer
Summary
AddLayer sample — demonstrates dynamic layer addition and visual parameter configuration.
Description
What the sample shows:
- Programmatically creating a TGIS_LayerSHP instance for vector data
- Adding layers to the viewer via GIS.Add() method
- Using GisCreateLayer factory to auto-detect layer type from file extension
- Setting visual rendering parameters: fill colour, line width, outline, line colour
- Disabling automatic .ttkgp config-file loading with UseConfig property
- Applying customised parameters so layers display as explicitly configured
- Fitting viewport to all loaded layers with GIS.FullExtent()
- Switching viewer interaction modes: Drag (pan) vs. Select (click features)
- Zooming programmatically by scaling current Zoom value up/down
This is a very basic sample. Probably the first sample we ever created.
This sample illustrates use of:
| Name | Description |
|---|---|
| TGIS_Layer.Params | Parameters (colors, fills, etc.) object. |
| TGIS_Layer.Path | Path to file holding the layer's data. |
| TGIS_LayerSHP | Layer that can read SHP file. |
| TGIS_Layer.Params | Parameters (colors, fills, etc.) object. |
| TGIS_Viewer.Add | Add a layer to the Viewer. |
| TGIS_Utils.GisCreateLayer | Create a layer given by a name. |
Code
This sample is available on the following platforms (click to view the source code on GitHub):
2026/06/08 21:59