##vector-tile-glib

Vector-tile-glib is a C library that can be used to render the Mapbox Vector tile format using MapCSS. It is written using GLib and GObject making it available in all languages that have GObject introspection bindings.

Dependencies

In order to build and use vector-tile-glib you need the following installed:

• Gio
• libprotobuf-c
• cairo
• pangocairo
• protoc-c
• Lemon
• Flex

Building

Build the library like this:

$ ./autogen.sh --enable-gtk-doc
$ ./configure
$ make
$ make install

Tools

There are also some tools available in the repository to explore the library.

tile-to-png

This takes a mapbox file and converts it to a PNG image using the sample.mss file:

$ ./tile-to-png -h
Usage:
  lt-tile-to-png [OPTION...] - test rendering to png image

Help Options:
  -h, --help       Show help options

Application Options:
  -s, --size       The size of the tile, default: 256
  -z, --zoom       The zoom-level of the tile, default: 0
  -o, --output     Output PNG filename, default: 'image.png'

dump-info

This tool will print all features and stylable tags of a mapbox file.

$ ./dump-info -h
Usage:
  lt-dump-info [OPTION...] - print information in tile

Help Options:
  -h, --help       Show help options

get-tile

This tool will download a mapbox file from the Mapzen tile service. You specify a search-term or latitude/longitude and a zoom-level. To use this you also need to have libsoup and geocode-glib installed.

$ ./get-tile -h
Usage:
  get-tile [OPTION...] - download mapbox tile

Help Options:
  -h, --help       Show help options

Application Options:
  --latitude       Latitude to get tile y for
  --longitude      Longitude to get tile y for
  -z, --zoom       zoom level
  -s, --search     Location to get tile for

MapCSS

Currently the following MapCSS constructs and properties are supported, let me know what you are missing the most!

Selector types

node
way
line
canvas
area

Tests

[tag=value]
[tag!=value]
[tag]
[!tag]

Zoom filters

area|zn
area|zn-n+x

Properties

fill-color
fill-opacity
z-index
width
color
opacity
dashes
linecap
linejoin
casing-width
casing-color
casing-opacity
casing-dashes
casing-linejoin
casing-linecap
text
font-family
font-size
font-weight
font-style
font-variant
text-decoration
text-transform
text-color
text-opacity
text-halo-color
text-halo-radius

Example

canvas {
    fill-color: #FAEBD7;
}

node|z5-10[place=country] {
    text-color: #4A90D9;
    text: name;
    text-halo-radius: 2;
    text-halo-color:white;
}

node|z5-13[place=city] {
    font-family: cantarell;
    font-weight: bold;
    text-color: #000000;
    font-size: 14;
    text: name;
    text-halo-radius: 2;
    text-halo-color: white;
}

way|z8-17[highway] {
    color: #d2ccc3;
    casing-color: #c7b8a4;
    casing-width: 1;
}

way|z8-17[highway=motorway],
way|z8-17[highway=motorway_link] {
    color: #ffaf60;
    casing-color: #f57900;
    z-index: 7;
}

area|z16-19[building] {
    text: name;
    text-color: #222233;
    text-halo-color: white;
    text-halo-radius: 1;
    font-size: 8;
    font-family: cantarell;
}

area|z16-19[landuse] {
    text: name;
    text-color: #222233;
    text-halo-color: white;
    text-halo-radius: 1;
    font-size: 8;
    font-family: cantarell;
}