Скачать или смотреть How to Draw a LineString in OpenLayers 6

Learn how to easily draw a `LineString` feature in OpenLayers 6 by following our comprehensive guide, complete with code examples and explanations.
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This video is based on the question https://stackoverflow.com/q/64754272/ asked by the user 'Hansted' ( https://stackoverflow.com/u/5186042/ ) and on the answer https://stackoverflow.com/a/64755455/ provided by the user 'Mike' ( https://stackoverflow.com/u/10118270/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Draw a LineString in OpenLayers 6: A Step-by-Step Guide

Creating dynamic maps with OpenLayers 6 is an exciting endeavor, especially when you want to visualize relationships between points, like drawing lines between markers. However, you might find it challenging to add a LineString feature due to complex documentation and examples. In this guide, we'll break down how to draw a LineString connecting two markers on your map effectively.

Understanding the Requirements

Before diving into the solution, let’s clarify what we need to achieve. You need to draw a line between two points (markers) on a map that uses the EPSG:25832 projection. Here are the key components we'll work with:

OpenLayers Map: We have a map which includes a WMTS layer and two markers.

LineString Feature: The goal is to generate a line that connects these markers.

Step-by-Step Instructions

1. Set Up Your Map

We will begin with a basic map setup that utilizes WMTS and vector layers to display the markers. Here's the initial part of the code that sets the map:

[[See Video to Reveal this Text or Code Snippet]]

2. Creating a LineString Feature

Next, to create a LineString, you need to pull the coordinates from your two markers and construct the line feature. Here’s the code that accomplishes this:

[[See Video to Reveal this Text or Code Snippet]]

3. Adding the LineString to Your Map

You can add the LineString feature to a new vector layer or an existing vector source. Here is how you can do this:

Using a New Layer:

[[See Video to Reveal this Text or Code Snippet]]

Using an Existing Vector Source:

If you prefer to add the LineString to an existing vector source, you can do this:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

Drawing a LineString in OpenLayers 6 involves a few steps but becomes manageable when broken down. By following the above instructions, you should now be able to draw lines connecting different points on your map effortlessly. For any further customization (like styling the line), you can modify the Style instance as per your needs. Happy mapping!