carto vl legends

[andy-esch]

Adds CARTO VL legends for color ramps and places them in an airship container. If a layer does not have a ramp then the legend and container do not appear. If a category map is created, no legend will appear.

Example

layers = [
    vector.Layer('all_month_3',
                 color='ramp(globalquantiles($mag), antique)',
                 size=20,
                 strokeWidth=0,
                 interactivity={'cols': ['mag', ], 'event': 'click'},
                 legend='Earthquakes'),
    vector.Layer('brooklyn_poverty',
                 color='ramp(globalquantiles($poverty_per_pop, 5), mint)',
                 strokeWidth=0,
                 legend='Brooklyn Poverty'),
    vector.Layer('brooklyn_poverty',
                 color='ramp(globalquantiles($poverty_per_pop, 5), prism)',
                 strokeWidth=0,
                 legend='Brooklyn Poverty 2'),
    vector.LocalLayer(data2,
                      color='ramp(globalquantiles($poverty_per_pop, 7), oryel)',
                      legend='Local Layer')
]
vector.vmap(
    layers,
    context=cc,
    basemap=vector.BaseMaps.darkmatter,
    size=(1024, 512)
)

Output:

Future work

• add category legends
• legends on continuous variables (e.g., ramp($var, mint)) where there are not discrete breaks
• Make content responsive in airship so that smaller widths have legends as a separate tab
• Make layers selectable using checkboxes or clicking on the header
• Optionally add layer color for non-ramp layers. e.g., if there are two distinct point layers, show a color for each layer with a description next to them so they are identifiable

cc @rochoa

[coveralls]

Coverage increased (+0.002%) to 97.716% when pulling 5432edc on carto-vl-legends into d10ceac on master.

[coveralls]

Coverage increased (+0.002%) to 97.716% when pulling 5432edc on carto-vl-legends into d10ceac on master.

[coveralls]

Coverage increased (+0.002%) to 97.716% when pulling 5432edc on carto-vl-legends into d10ceac on master.

[coveralls]

Coverage increased (+0.002%) to 97.716% when pulling 5432edc on carto-vl-legends into d10ceac on master.

[coveralls]

Coverage increased (+0.002%) to 97.716% when pulling 5432edc on carto-vl-legends into d10ceac on master.

[coveralls]

Coverage increased (+0.002%) to 97.716% when pulling 5432edc on carto-vl-legends into d10ceac on master.

[coveralls]

Coverage increased (+0.002%) to 97.716% when pulling 5432edc on carto-vl-legends into d10ceac on master.

[coveralls]

Coverage increased (+0.002%) to 97.716% when pulling 5432edc on carto-vl-legends into d10ceac on master.