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DEVELOPING.md

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Developing

Setting up development environment

You will obviously start by forking the ol-ext repository.

Install the dependencies

Go in the project directory and run the npm install that will install the dependencies in the local node_modules folder.

Creating the distribution

Since v.2 the extensions are provided as ES6 modules. To be used in a web page you have to create the distribution.

Use the build command to create a distribution of the project into the /dist directory:

npm run build

Create individual files

If you don't want to use the whole distribution in a web page, you can create individual js compatible with your browser. Use the build lib command to create individual files into the /lib directory then link tpo this files:

npm run build lib

Watch files and live reload

To help creating and testing the examples when developping you can use the watch or serve task.

To recreate the distribution on the fly when js files change, use the watch task:

gulp watch

You can use the serve task to start a live server:

gulp serve

See the result in your browser at http://localhost:8181. The dist will be recreated on each changes and the page will reload on the browser.

Adding new extensions

To ensure the correct translation beetween the modules and the distribution on ol classes:

  • Export one class per file as default
  • Use the naming convention

Naming convention

To ensure the correct translation beetween the modules and the distribution on ol classes, we use the following naming convention.

In Openlayers classes just replace the point by a underscore.

  • Thus the ol.layer.Vector class must be imported as ol_layer_Vector.
  • A new control ol.control.MyControl must be declared as ol_control_MyControl

The file name must reflect the name of the extension and should be placed in the src directory corresponding to its namespace. Thus ol_control_MyControlmust be created in the ./src/control/MyControl.js file and can be used in a webpack as:

import ol_control_MyControl from 'ol-ext/control/MyControl.js';

Example:

// Import ol classes
import ol_ext_inherits from '../util/ext.js'
import ol_control_Control from 'ol/control/Control.js'

// Create my control
var ol_control_MyControl = function(options) {
  ol_control_Control.call(this,options);
}
ol_ext_inherits(ol_control_MyControl, ol_control_Control);

// Export my control
export default ol_control_MyControl

Linting

The project use eslint to lint the code, just type in a console:

npm run lint

Building the documentation:

The documentation use gulp-jsdoc3 to create the doc.

  1. install the gulp-jsdoc3 project at the root directory:
npm install gulp-jsdoc3
  1. then run the gulp command to create the doc in the doc/doc-pages directory:
gulp doc