samples:samples:viewerlite
Table of Contents
ViewerLite sample
Documentation | Samples | ViewerLite
Summary
ViewerLite Sample - Minimal lightweight map viewer application for displaying GIS data, available for mobile platforms (FMX, WPF, MAUI).
Description
What the sample shows:
- Creating a minimal/lightweight map viewer application
- Opening project files with TGIS_Viewer.Open()
- Displaying layers from a project
- Closing projects with TGIS_Viewer.Close()
- Full extent zoom using TGIS_Viewer.FullExtent()
- Detecting empty viewers with TGIS_Viewer.IsEmpty
- Accessing all layers via TGIS_Viewer.Items
- Working with coordinate systems (TGIS_Viewer.CS)
- Locating shapes on map (TGIS_Viewer.Locate)
- Converting screen coordinates to map coordinates
- High-resolution display support (HiRes)
- Feature selection and deselection
- Simplified viewer UI suitable for mobile (FMX) platforms
See also Viewer sample.
This sample illustrates use of:
| Name | Description |
|---|---|
| TGIS_Viewer.Open | Open a project. |
| TGIS_Viewer.Close | Close the current project. |
| TGIS_ViewerWnd.Mode | Determines how the viewer reacts to mouse input. |
| TGIS_Viewer.FullExtent | Calculate the screen origin, zoom, and viewport to place the whole map in the window. |
| TGIS_Viewer.IsEmpty | True if the viewer is empty and contains no layers. |
| TGIS_Viewer.Items | All layers. |
| TGIS_Viewer.CS | Coordinate system assigned to the viewer. |
| TGIS_Viewer.Locate | Locates the shape nearest to _ptg that is within _prec. |
| TGIS_Viewer.ScreenToMap | Converts point coordinates from screen coordinates to map coordinates. |
| TGIS_ViewerWnd.HiRes | Enables high-resolution rendering. |
| TGIS_LayerVector.DeselectAll | Clears the selection state of all shapes in the layer. |
| TGIS_Shape.IsSelected | Shape is selected in the layer. |
Code
This sample is available on the following platforms (click to view the source code on GitHub):
2026/08/30 05:53