samples:samples:zooming
Table of Contents
Zooming sample
Documentation | Samples | Zooming
Summary
Zooming Sample - Interactive map navigation using mouse wheel zoom, drag-select zoom region, and switching between zoom and pan modes.
Description
What the sample shows:
- Zooming using mouse movement and mouse wheel
- Implementing zoom-to-region with drag-select
- Setting specific zoom levels programmatically
- Panning and scrolling within zoomed view
- Zoom in/out button controls
- Centering view on selected features
- Maintaining aspect ratio during zoom
- Animation of zoom transitions
This sample illustrates use of:
| Name | Description |
|---|---|
| TGIS_Viewer.Open | Open a project. |
| TGIS_Viewer.FullExtent | Calculate the screen origin, zoom, and viewport to place the whole map in the window. |
| TGIS_ViewerWnd.Mode | Determines how the viewer reacts to mouse input. |
| TGIS_ViewerWnd.ZoomBy | Zoom the viewer. |
Code
This sample is available on the following platforms (click to view the source code on GitHub):
2026/07/08 06:04