Dynamic gradient with GeoJSON about leaflet-dvf

[sfairgrieve]

Good question. You should be able to do this using the DataLayer displayOptions option. Under displayOptions, you should be able to map properties of your GeoJSON feature to Leaflet style options: https://github.com/humangeo/leaflet-dvf/wiki/8.-Datalayers.

Does this not work for you? Or do you need to do some mapping to style properties that involves multiple data properties found in a GeoJSON feature?

[codingisacopingstrategy]

Thanks for your swift reply—yes, I can rewrite my features so the gradient depends on one property only. I’ve been trying to setup a dataLayer that draws the GeoJSON instead of using a traditional leaflet GeoJson layer, but I think I’m doing something wrong:

var dataLayer = new L.DataLayer(data, {
    recordsField: 'features',
    locationMode: L.LocationModes.GEOJSON,
    layerOptions: {
        color: "#000000",
        fillOpacity: 0.7,
        opacity: 1,
        weight: 1,
        gradient: true
    },
    displayOptions: {
        gradient_stops: stops2gradient
    }
});
map.addLayer(dataLayer);

Full code @ http://jsfiddle.net/2JuzV/4/

Nothing gets drawn yet (also when I remove displayOptions). Could you give me some pointers on how to set up my dataLayer?

Cheers,

[codingisacopingstrategy]

EDT: fixed the link in the comment above to http://jsfiddle.net/2JuzV/4/

[sfairgrieve]

Eric,

Try this: http://jsfiddle.net/2JuzV/12/

Is that what you're going for, or do you want to display markers rather
than polygons? Basically ChoroplethDataLayer will display and style
polygons, and DataLayer will display a marker centered at the polygon
centroid (need to include jsts.js for calculating the centroid).

Scott

On Wed, Jul 9, 2014 at 12:21 PM, Eric Schrijver [email protected]
wrote:

EDT: fixed the link in the comment above to http://jsfiddle.net/2JuzV/4/

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[codingisacopingstrategy]

Hey Scott—

Great, that does it! I hadn’t understood exactly the difference between the various types of DataLayers.

Added some more data points to the fiddle so you can see the gradient change with the longitude. (The polygons themselves represent parts of Russia where a high chance of rainbows is calculated, BTW :)

Cheers, Thanks

[sfairgrieve]

Awesome, very cool!

Scott

On Thu, Jul 10, 2014 at 7:46 AM, Eric Schrijver [email protected]
wrote:

Hey Scott—

Great, that does it! I hadn’t understood exactly the difference between
the various types of DataLayers.

Added some more data points to the fiddle http://jsfiddle.net/2JuzV/14/
so you can see the gradient change with the longitude. (The polygons
themselves represent parts of Russia where a high chance of rainbows is
calculated, BTW :)

Cheers,

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#32 (comment).