OpenLayers Style Editor

Background

This package was created in the context of the LAND IT project, a decision support system to help stakeholders planning a new landscape for the most affected areas by wildfires in Portugal. LAND IT uses OpenLayers as its main GIS dependency, and throughout the project the need to edit layers styles increased.

Presentation

This Style Editor for OpenLayers allows the user to change the style of layers. This editor was inspired in both QGIS and ArcMap editors.

There are three edition modes:

Unique Symbol: Allows the user to change the layer's color, opacity, and stroke.
Categorized: Allows the user to change the layer's color, opacity, and stroke based on the values of an attribute.
Graduated: Allows the user to change the layer's color, opacity, and stroke based on a numeric attribute and the mode used to group its values. This package has six modes implemented, some of them are implemented using the GeoBuckets package. The implemented modes are:

Manual
Equal Intervals
Defined Intervals
Quantile
Natural Breaks (Jenks)
Standard Deviation

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Installation

Depending on the installed package provider, this package can be installed with one of the following commands.

npm i openlayers-style-editor

yarn add openlayers-style-editor

Usage

Firstly it is necessary to import the styles of the package. This can be done by adding the following code snippet to your index/main file.

import 'openlayers-style-editor/dist/openlayers-style-editor.css';

It is possible to enjoy this package by adding the following code snippets to your code.

import { Render, RenderType, StyleEditor } from "openlayers-style-editor";

const [visible, setVisible] = useState<boolean>(false);

const defaultRender: Render = {
    type: RenderType.Unique,
    rendererOL: {
        'fill-color': [255, 255, 50, 1],
        'stroke-color': [0, 0, 0, 1],
        'stroke-width': 1,
    }
}

const [renderer, setRenderer] = useState<Render>(defaultRender);

<StyleEditor visible={visible}
               setVisible={setVisible}
               layerDefaultRenderer={defaultRender}
               layerCurrentRenderer={renderer}
               applyRenderer={(renderer) => setRenderer(renderer)}
               features={features}
               primeReactTheme={"bootstrap4-light-blue"}
               showPreDefinedRamps={true} moreRamps={[]} predefinedStyles={[]} />

To see a full example click here.

Props Details

Name	Requirement	Description	Example
visible (boolean)	mandatory	Defines if the component is visible or not	true
setVisible (function)	mandatory	Function to set the visibility of the component	() => setVisible(!visible)
layerDefaultRenderer (Render)	mandatory	Default renderer of the layer to be edited	{ type: RenderType.Unique, rendererOL: { 'fill-color': [255, 255, 50, 1], 'stroke-color': [0, 0, 0, 1], 'stroke-width': 1, } }
layerCurrentRenderer (Render)	mandatory	Current renderer of the layer	{ type: RenderType.Unique, rendererOL: { 'fill-color': [255, 255, 50, 1], 'stroke-color': [0, 0, 0, 1], 'stroke-width': 1, } }
applyRenderer (function)	mandatory	Function to apply the renderer to the layer, it has as parameter the renderer to be applied	(renderer) => setRenderer(renderer)
features (Feature[])	mandatory	Features to be rendered on the map
showPreDefinedRamps (boolean)	mandatory	Show the predefined ramps of the package	true
moreRamps (ColorRamp[])	optional	An array of color ramps that can be added to the package	[{ id: 28, //id needs to be >=28 name: "GnBu", palette: [ {offset: 0.25, color: fromString("rgb(186,228,188)")}, {offset: 0.5, color: fromString("rgb(123,204,196)")}, {offset: 0.75, color: fromString("rgb(67,162,202)")}, ], }]
predefinedStyles (PredefinedRenderer[])	optional	Predefined styles to be used on the categorized style type	[{name: "Dangerousness", renderer: [{value: "Very High", color: [255, 0, 0]}, {value: "High", color: [255, 128, 0]}, {value: "Medium", color: [255, 255, 0]}, {value: "Low", color: [139, 209, 0]}, {value: "Very Low", color: [56, 168, 0]}]},]
addingToHeader (string)	optional	Text to be added to the header	- Dangerousness Layer
primeReactTheme (string)	optional	PrimeReact theme to be used, all option can be found here	lara-light-green
numbersLocale (string)	optional	Locale to be used on numbers, represented using BCP 47 language tag. Default is 'en-US'	en-US
textLocale (string)	optional	Locale to be used for text. This package has two options available: 'en' and 'pt'. Default is 'en'. To add a custom locale, use the customLocale prop and in the textLocale prop use 'custom'	pt
customLocale (Record<string, any>)	optional	Custom locale to be used in case the textLocale is set to 'custom'. This prop must have the same structure as the default locale, that can be found here	{"common": { "style_editor": "Editor de Estilos", "reset_style": "Repor Estilo", ... }}

Getting Started

Demo

Contents

Info

Links

Contributors