v0.21.0

New Features + Improvements

• Add support for text highlight boxes + underlines on point labels #761 #724 #723
  • Add an optional box behind text labels via the following parameters in a new font.background block:
    • font.background.color: text box fill color
    • font.background.alpha: optionally modify box fill alpha
    • font.background.stroke.color: text box stroke color
    • font.background.stroke.alpha: optionally modify box stroke alpha
    • font.background.stroke.width: text box stroke width (defaults to 1px)
  • Optional underline for text labels via new parameter font.underline
    • underline: true to enable text underline
  • Text box fill, stroke, and underline are independent options which can be mixed and matched as desired. Example with all 3:

      draw:
        text:
          font:
            ...
            background:
              color: white
              stroke:
                color: red
                width: 2px
            underline: true
    

• Support variable font weight ranges + JS function weights #757
  • Variable fonts allow multiple variants of a font to be stored in a single file. Supporting these can streamline the Tangram font definition, reduces network requests, and introduces new cartographic flexibility for dynamically-driven font weights.
  • Example supporting font weights of 200 through 800:

    fonts:
      Open Sans:
          url: fonts/Open Sans.woff2
          weight: 200 800
    

  • Example of JS function-based font weight, e.g. mapping font weight to building heights:

    weight: |
      function() {
        return (feature.height||0) * 2 + 400;
    }
    

• Automatically add Leaflet attribution controls based on data source property #763
  • Adds a new attribution property on data sources, which when present will add a Leaflet attribution control. Thanks @bdon!
  • Example:

      sources:
        tilezen:
          type: MVT
          url: https://tile.nextzen.org/tilezen/vector/v1/512/all/{z}/{x}/{y}.mvt
          attribution: Tiles by <a href="https://www.nextzen.org/" target="_blank">Nextzen</a>
          ...
    

• Improved proxy tile handling for better coverage when zooming in/out (thanks @bdon!) #762
• Support for MultiPoint geometries in MVT data sources 8554c27

Bug Fixes / Internal

• Outlines are now properly extruded with their lines #749
• Remove use of flatMap()
• Upgrade earcut library to v2.2.2 #755