Adds CurvedLineSymbolizer

[ibesora]

Adds a new symbolizer to be used with curved labels.
Supports the same properties as LineLabelSymbolizer

{
    //water-line-label
    dataLayer: `natural_label`,
    symbolizer: new CurvedLabelSymbolizer({
      label_props: ["name_en", "name"],
      fill: params.waterPointLabelColor1,
      fontFamily: SansSerifRegular.fontFamily,
      fontSize: 20,
      letterSpacing: 0.25,
    }),
  },

Closes issue #38

[bdon]

is there a way to avoid adding these two keys? at the unit of a single Label, a Label's multiple bounding boxes are allowed to collide already - this happens with line label cells. So if a curved label can be expressed as one Label, this check shouldn't be necessary.

[ibesora]

Looking into it. I added that because it was removing parts of the text

[bdon]

What if we enforce a maximum curvature of the segment? I'm testing it against the layer physical_line in the protomaps tiles and it works fine for some and less for others:

[ibesora]

What if we enforce a maximum curvature of the segment? I'm testing it against the layer physical_line in the protomaps tiles and it works fine for some and less for others:

Yup, it makes sense because there are angles that can be difficult to solve. Is there an easy way I can reproduce what you are seeing?

[bdon]

Use the protomaps tiles, demo api key on localhost, data layer physical_line