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mapnik.Map

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David Castelblanco edited this page Jul 7, 2017 · 5 revisions

Below are a list of methods and properties available in mapnik.Map.

  • Map.append_style - adds a style to the map
  • Map.aspect_fix_mode
  • Map.background
  • Map.base
  • Map.buffer_size
  • Map.buffered_envelope
  • Map.envelope - gets a bounding box of the map
  • Map.extra_attributes
  • Map.find_inmem_metawriter
  • Map.find_style - using a style name string (which can be found through LaMap.yer.syles), returns a mapnik.Style object
  • Map.get_metawriter_property
  • Map.has_metawriter
  • Map.height
  • Map.layers - contains a list of Layer objects
  • Map.maximum_extent
  • Map.pan
  • Map.pan_and_zoom
  • Map.query_map_point
  • Map.query_point
  • Map.remove_all
  • Map.remove_style
  • Map.resize
  • Map.scale
  • Map.scale_denominator
  • Map.set_metawriter_property
  • Map.srs
  • Map.view_transform
  • Map.width
  • Map.zoom
  • Map.zoom_all
  • Map.zoom_to_box - takes an Envelope as an argument and zooms to that location

append_style

append_style( (Map)arg1, (str)style_name, (Style)style_object) -> bool : Insert a Mapnik Style onto the map by appending it.

Usage:
>>> sty
<mapnik._mapnik.Style object at 0x6a330>
>>> m.append_style('Style Name', sty)
True # style object added to map by name
>>> m.append_style('Style Name', sty)
False # you can only append styles with unique names


C++ signature :
    bool append_style(mapnik::Map {lvalue},std::string,mapnik::feature_type_style)

aspect_fix_mode

None

background

None

base

str(object) -> string

Return a nice string representation of the object. If the argument is a string, the return value is the same object.

buffer_size

int(x[, base]) -> integer

Convert a string or number to an integer, if possible. A floating point argument will be truncated towards zero (this does not include a string representation of a floating point number!) When converting a string, use the optional base. It is an error to supply a base when converting a non-string. If base is zero, the proper base is guessed based on the string content. If the argument is outside the integer range a long object will be returned instead.

buffered_envelope

buffered_envelope( (Map)arg1) -> Box2d : Get the Box2d() of the Map given the Map.buffer_size.

Usage:
>>> m = Map(600,400)
>>> m.envelope()
Box2d(-1.0,-1.0,0.0,0.0)
>>> m.buffered_envelope()
Box2d(-1.0,-1.0,0.0,0.0)
>>> m.buffer_size = 1
>>> m.buffered_envelope()
Box2d(-1.02222222222,-1.02222222222,0.0222222222222,0.0222222222222)


C++ signature :
    mapnik::box2d<double> buffered_envelope(mapnik::Map {lvalue})

envelope

envelope( (Map)arg1) -> Box2d : Return the Map Box2d object and print the string representation of the current extent of the map.

Usage:
>>> m.envelope()
Box2d(-0.185833333333,-0.96,0.189166666667,-0.71)
>>> dir(m.envelope())
...'center', 'contains', 'expand_to_include', 'forward',
...'height', 'intersect', 'intersects', 'inverse', 'maxx',
...'maxy', 'minx', 'miny', 'width'


C++ signature :
    mapnik::box2d<double> envelope(mapnik::Map {lvalue})

extra_attributes

extra_attributes( (Map)arg1) -> Parameters : TODO

C++ signature :
    mapnik::parameters extra_attributes(mapnik::Map {lvalue})

find_inmem_metawriter

find_inmem_metawriter( (Map)arg1, (str)name) -> MetaWriterInMem : Gets an inmem metawriter, or None if no such metawriter exists. Use this after the map has been rendered to retrieve information about the hit areas rendered on the map.

C++ signature :
    boost::shared_ptr<mapnik::metawriter_inmem> find_inmem_metawriter(mapnik::Map,std::string)

find_style

find_style( (Map)arg1, (str)style_name) -> Style : Query the Map for a style by name and return a style object if found or raise KeyError style if not found.

Usage:
>>> m.find_style('Style Name')
<mapnik._mapnik.Style object at 0x654f0>


C++ signature :
    mapnik::feature_type_style find_style(mapnik::Map,std::string)

get_metawriter_property

get_metawriter_property( (Map)arg1, (str)name) -> str : Reads a metawriter property. These properties are completely user-defined and can be used tocreate filenames, etc.

Usage:
>>> map.set_metawriter_property("x", "10")
>>> map.get_metawriter_property("x")
10


C++ signature :
    std::string get_metawriter_property(mapnik::Map {lvalue},std::string)

has_metawriter

has_metawriter( (Map)arg1) -> bool : Check if the Map has any active metawriters

Usage:
>>> m.has_metawriter()
False


C++ signature :
    bool has_metawriter(mapnik::Map)

height

int(x[, base]) -> integer

Convert a string or number to an integer, if possible. A floating point argument will be truncated towards zero (this does not include a string representation of a floating point number!) When converting a string, use the optional base. It is an error to supply a base when converting a non-string. If base is zero, the proper base is guessed based on the string content. If the argument is outside the integer range a long object will be returned instead.

layers

None

maximum_extent

pan

pan( (Map)arg1, (int)x, (int)y) -> None : Set the Map center at a given x,y location as integers in the coordinates of the pixmap or map surface.

Usage:
>>> m = Map(600,400)
>>> m.envelope().center()
Coord(-0.5,-0.5) # default Map center
>>> m.pan(-1,-1)
>>> m.envelope().center()
Coord(0.00166666666667,-0.835)


C++ signature :
    void pan(mapnik::Map {lvalue},int,int)

pan_and_zoom

pan_and_zoom( (Map)arg1, (int)x, (int)y, (float)factor) -> None : Set the Map center at a given x,y location and zoom factor as a float.

Usage:
>>> m = Map(600,400)
>>> m.envelope().center()
Coord(-0.5,-0.5) # default Map center
>>> m.scale()
-0.0016666666666666668
>>> m.pan_and_zoom(-1,-1,0.25)
>>> m.scale()
0.00062500000000000001


C++ signature :
    void pan_and_zoom(mapnik::Map {lvalue},int,int,double)

query_map_point

query_map_point( (Map)arg1, (int)layer_idx, (float)pixel_x, (float)pixel_y) -> Featureset : Query a Map Layer (by layer index) for features intersecting the given x,y location in the pixel coordinates of the rendered map image. Layer index starts at 0 (first layer in map). Will return a Mapnik Featureset if successful otherwise will return None.

Usage:
>>> featureset = m.query_map_point(0,200,200)
>>> featureset
<mapnik._mapnik.Featureset object at 0x23b0b0>
>>> featureset.features
>>> [<mapnik.Feature object at 0x3995630>]


C++ signature :
    boost::shared_ptr<mapnik::Featureset> query_map_point(mapnik::Map,int,double,double)

query_point

query_point( (Map)arg1, (int)layer idx, (float)x, (float)y) -> Featureset : Query a Map Layer (by layer index) for features intersecting the given x,y location in the coordinates of map projection. Layer index starts at 0 (first layer in map). Will return a Mapnik Featureset if successful otherwise will return None.

Usage:
>>> featureset = m.query_point(0,-122,48)
>>> featureset
<mapnik._mapnik.Featureset object at 0x23b0b0>
>>> featureset.features
>>> [<mapnik.Feature object at 0x3995630>]


C++ signature :
    boost::shared_ptr<mapnik::Featureset> query_point(mapnik::Map,int,double,double)

remove_all

remove_all( (Map)arg1) -> None : Remove all Mapnik Styles and layers from the Map.

Usage:
>>> m.remove_all()


C++ signature :
    void remove_all(mapnik::Map {lvalue})

remove_style

remove_style( (Map)arg1, (str)style_name) -> None : Remove a Mapnik Style from the map.

Usage:
>>> m.remove_style('Style Name')


C++ signature :
    void remove_style(mapnik::Map {lvalue},std::string)

resize

resize( (Map)arg1, (int)width, (int)height) -> None : Resize a Mapnik Map.

Usage:
>>> m.resize(64,64)


C++ signature :
    void resize(mapnik::Map {lvalue},unsigned int,unsigned int)

scale

scale( (Map)arg1) -> float : Return the Map Scale. Usage:

>>> m.scale()


C++ signature :
    double scale(mapnik::Map {lvalue})

scale_denominator

scale_denominator( (Map)arg1) -> float : Return the Map Scale Denominator. Usage:

>>> m.scale_denominator()


C++ signature :
    double scale_denominator(mapnik::Map {lvalue})

set_metawriter_property

set_metawriter_property( (Map)arg1, (str)name, (str)value) -> None : Sets a metawriter property. These properties are completely user-defined and can be used tocreate filenames, etc.

Usage:
>>> map.set_metawriter_property("x", str(x))
>>> map.set_metawriter_property("y", str(y))
>>> map.set_metawriter_property("z", str(z))

Use a path like "[z]/[x]/[y].json" to create filenames.


C++ signature :
    void set_metawriter_property(mapnik::Map {lvalue},std::string,std::string)

srs

str(object) -> string

Return a nice string representation of the object. If the argument is a string, the return value is the same object.

view_transform

view_transform( (Map)arg1) -> ViewTransform : Return the map ViewTransform object which is used internally to convert between geographic coordinates and screen coordinates.

Usage:
>>> m.view_transform()


C++ signature :
    mapnik::CoordTransform view_transform(mapnik::Map {lvalue})

width

zoom

zoom( (Map)arg1, (float)factor) -> None : Zoom in or out by a given factor. Positive number zooms in, negative number zooms out.

Usage:

>>> m.zoom(0.25)


C++ signature :
    void zoom(mapnik::Map {lvalue},double)

zoom_all

zoom_all( (Map)arg1) -> None : Set the geographical extent of the map to the combined extents of all active layers.

Usage:
>>> m.zoom_all()


C++ signature :
    void zoom_all(mapnik::Map {lvalue})

zoom_to_box

zoom_to_box( (Map)arg1, (Box2d)Boxd2) -> None : Set the geographical extent of the map by specifying a Mapnik Box2d.

Usage:
>>> extent = Box2d(-180.0, -90.0, 180.0, 90.0)
>>> m.zoom_to_box(extent)


C++ signature :
    void zoom_to_box(mapnik::Map {lvalue},mapnik::box2d<double>)
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