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ol-esri-style's Introduction

Convert ESRI styles to OpenLayers styles

Info

This module can convert ESRI style definition to OpenLayers style function. ESRI style definition must be in JSON format - https://developers.arcgis.com/documentation/common-data-types/renderer-objects.htm

Getting started

Import as ES6 module:

import { createStyleFunction, createStyleFunctionFromUrl } from 'ol-esri-style';

// create a new vector layer
const vector = new VectorLayer({
  ...
});
const proj = map.getView().getProjection();

// set layer style directly from the layer URL
// Passing the projection is need for labeling features. Visible resolutions for
// the labels are calculated using map projection units.
createStyleFunctionFromUrl('arcgis_server_layer_url', proj).then(styleFunction => {
  vector.setStyle(styleFunction);
});

// You can also retrieve the layer info yourself and use it to create the style
// function
fetch(`${arcgis_server_layer_url}?f=json`)
    .then(res => res.json())
    .then(json => createStyleFunction(json, proj))
    .then(styleFunction => {
        vector.setStyle(styleFunction);
    });

You can modify the styles before applying them to the features:

// set layer style
createStyleFunctionFromUrl('arcgis_server_layer_url').then(styleFunction => {
  vector.setStyle((feature, resolution) => {
    const styles = styleFunction(feature, resolution);

    // modify styles

    return styles;
  });
});

Example

To check the example stored in /example directory run:

npm run dev

The example loads data from https://services3.arcgis.com/GVgbJbqm8hXASVYi/ArcGIS/rest/services/2020_Earthquakes/FeatureServer and the style definition is from https://services3.arcgis.com/GVgbJbqm8hXASVYi/ArcGIS/rest/services/2020_Earthquakes/FeatureServer/0?f=json.

Dependencies

License

The MIT License (MIT).

ol-esri-style's People

Contributors

bojko108 avatar dependabot[bot] avatar categulario avatar zakariah1 avatar jnystad avatar bierett avatar

Stargazers

Youssef Harby avatar Jinghao Hu avatar avatar jiaqu avatar Soundarya0 avatar avatar Christoph avatar avatar Will Breitkreutz avatar avatar

Watchers

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Forkers

zakariah1 jnystad gbraide ecotrust novokia categulario jdewilde

ol-esri-style's Issues

Support for dashed lines

Dashed line with label such esriSLSDash are rendered as solid lines. Is there support for dashed lines?

Openlayers - georeferencing with affine function

Hi Bogdan,
Sorry for creating an issue, but I couldn't find any other way to directly contact you.

I stumbled upon your question on SO: https://stackoverflow.com/questions/52904587/displaying-georeferenced-images-using-openlayers-5

I'm trying to do the same thing (georeference rotated maps in openlayers). I was wondering how Affine.js (https://codesandbox.io/s/kw9l85y5po?file=/src/Affine.js) is working under the hood. Is there any explanation for the calculations I could read and understand how it works?
Also, in your code there is no inverse function. Would calling the existing Affine.calculate function with reversed arguments do the trick?

Thanks and sorry for offtopic issue,
Patryk

Unable to render labels

Thanks for the great package. I am having some issues with labels. I am using 2 layers and I get the colors and styles of the features but no labels. I have installed the release from yesterday. These are the renderers:

Renderer:
Simple Renderer:
Symbol:
Style: esriSLSDash
Color: [0, 92, 230, 255]
Width: 0
Label:
Description:
Transparency: 0
Labeling Info:
Label Placement: esriServerLinePlacementCenterAlong
Label Expression: [DEPTH_M]
Use Coded Values: true
Symbol:
Color: [0, 77, 168, 255]
Background Color: N/A
Outline Color: N/A
Vertical Alignment: bottom
Horizontal Alignment: center
Right to Left: false
Angle: 0
XOffset: 0
YOffset: 0
Size: 8
Font Family: Arial
Font Style: normal
Font Weight: bold
Font Decoration: none
Min. Scale: 0.0
Max. Scale: 0.0

AND

Renderer:
Unique Value Renderer:
Field 1: ITZ_FORM
Field 2: null
Field 3: null
Field Delimiter: ,
Default Symbol:
N/A
Default Label: null
UniqueValueInfos:
Value: beach
Label: beach
Description:
Symbol:
Style: esriSLSSolid
Color: [0, 92, 230, 255]
Width: 2
Value: cliff
Label: cliff
Description:
Symbol:
Style: esriSLSSolid
Color: [255, 0, 0, 255]
Width: 2
Value: delta
Label: delta
Description:
Symbol:
Style: esriSLSSolid
Color: [255, 170, 0, 255]
Width: 2
Value: dune
Label: dune
Description:
Symbol:
Style: esriSLSSolid
Color: [255, 255, 0, 255]
Width: 2
Value: low-islets
Label: low-islets
Description:
Symbol:
Style: esriSLSSolid
Color: [0, 168, 132, 255]
Width: 2
Value: platform
Label: platform
Description:
Symbol:
Style: esriSLSSolid
Color: [255, 115, 223, 255]
Width: 2
Value: salt marsh
Label: salt marsh
Description:
Symbol:
Style: esriSLSSolid
Color: [76, 230, 0, 255]
Width: 2
Value: tidal Flat
Label: tidal flat
Description:
Symbol:
Style: esriSLSSolid
Color: [168, 112, 0, 255]
Width: 2
Transparency: 0
Labeling Info:
Label Placement: esriServerLinePlacementAboveAlong
Label Expression: [ITZ_FORM]
Use Coded Values: true
Symbol:
Color: [0, 0, 0, 255]
Background Color: N/A
Outline Color: N/A
Vertical Alignment: bottom
Horizontal Alignment: center
Right to Left: false
Angle: 0
XOffset: 0
YOffset: 0
Size: 8
Font Family: Arial
Font Style: normal
Font Weight: normal
Font Decoration: none
Min. Scale: 0.0
Max. Scale: 0.0

I am adding the layer to the map like this:

const esriVector = new VectorLayer({
source: vectorSource
});

setMapProjection(map.getView().getProjection());

createStyleFunctionFromUrl(esriUrl).then(styleFunction => {
esriVector.setStyle(styleFunction);
});

esriVector.set('name', layerID);

map.addLayer(esriVector);

Thanks in advance.

Inner global variable would cause problems if library is used in multiple views

the setMapProjection function alters a global variable that is shared among all uses of this library. This means that if a second map with a different projection is shown on the same page the second call to this function would replace the private mapProjection value and perhaps cause problems with labels for the first map.

I think a better approach would be for the createStyleFunction[fromUrl] functions to accept an optional projection parameter the user can pass if labels are in use.

Of course that would be a breaking change (because API changes).

If this is acceptable I would be happy to make a pull request.

And thanks for this amazing work (:

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