Layer styles

[jllucero]

Hello. I'd like help on changing the colors, line thickness, and fill for layers. I tried the "style" option from ipyleaflets for the folium plotting backend. But it doesn't work. I'd appreciate some examples.

Thank you!

[giswqs]

In folium, the style parameter name is called style_function. See below.

https://python-visualization.github.io/folium/quickstart.html#Styling-function

[jllucero]

Will this work if my layers were generated by "Map.add_gdf" and "Map.add_kml"?

[giswqs]

Yes, I believe so. All these functions have the kwargs argument, which will be passed to the add_geojson function behind the scene

[jllucero]

I'm trying to generalize that code to....
style_function = {"fillOpacity": 0.5,"weight": 0,"fillColor": "#black"}

leafmap.folium.TopoJson(
Fire_Zones,
"Fire Zones",
style_function=style_function,
).add_to(Map)

But I get an error.

[giswqs]

See the example below

import leafmap.foliumap as leafmap

Map = leafmap.Map(center=[0, 0], zoom=2)

url = "https://raw.githubusercontent.com/giswqs/leafmap/master/examples/data/countries.geojson"

def style(feature): 
    return {
    "stroke": True,
    "color": "#0000ff",
    "weight": 2,
    "opacity": 1,
    "fill": True,
    "fillColor": "#0000ff",
    "fillOpacity": 0.1,
}

Map.add_geojson(url, layer_name="Countries", style_function=style)
Map

[jllucero]

Thank you very much! It works!

[giswqs]

I just improved support for folium layer styles. Now the same code will work for both ipyleaflet and folium without making any changes. Check out the updated notebook example https://leafmap.org/notebooks/10_add_vector, which uses the folium plotting backend. You should get the same results using the ipyleaflet plotting backend.

[jllucero]

Thank you! This looks great.