Package mapnik :: Class Coord

Class Coord

 object --+    
          |    
??.instance --+
              |
             Coord

Known Subclasses:

_Coord

Represents a point with two coordinates (either lon/lat or x/y).

Following operators are defined for Coord:

Addition and subtraction of Coord objects:

>>> Coord(10, 10) + Coord(20, 20)
Coord(30.0, 30.0)
>>> Coord(10, 10) - Coord(20, 20)
Coord(-10.0, -10.0)

Addition, subtraction, multiplication and division between a Coord and a float:

>>> Coord(10, 10) + 1
Coord(11.0, 11.0)
>>> Coord(10, 10) - 1
Coord(-9.0, -9.0)
>>> Coord(10, 10) * 2
Coord(20.0, 20.0)
>>> Coord(10, 10) / 2
Coord(5.0, 5.0)

Equality of coords (as pairwise equality of components): >>> Coord(10, 10) is Coord(10, 10) False >>> Coord(10, 10) == Coord(10, 10) True

Instance Methods

__add__(...)
__add__( (Coord)arg1, (Coord)arg2) -> object :

__div__(...)
__div__( (Coord)arg1, (float)arg2) -> object :

__eq__(...)
__eq__( (Coord)arg1, (Coord)arg2) -> object :

__getinitargs__(...)
__getinitargs__( (Coord)arg1) -> tuple :

__init__(...)
__init__( (object)arg1, (float)x, (float)y) -> None : Constructs a new point with the given coordinates.

__mul__(...)
__mul__( (Coord)arg1, (float)arg2) -> object :

__radd__(...)
__radd__( (Coord)arg1, (float)arg2) -> object :

__reduce__(...)
helper for pickle

__repr__(self)
repr(x)

__rmul__(...)
__rmul__( (Coord)arg1, (float)arg2) -> object :

__sub__(...)
__sub__( (Coord)arg1, (Coord)arg2) -> object :

forward(self, projection)
Projects the point from the geographic coordinate space into the cartesian space.

inverse(self, projection)
Projects the point from the cartesian space into the geographic space.

Inherited from unreachable.instance: __new__

Inherited from object: __delattr__, __getattribute__, __hash__, __reduce_ex__, __setattr__, __str__

Class Variables
	__instance_size__ = `24`
	__safe_for_unpickling__ = `True`

Properties
	x Gets or sets the x/lon coordinate of the point.
	y Gets or sets the y/lat coordinate of the point.
Inherited from `object`: `__class__`

Method Details

add(...)
(Addition operator)


__add__( (Coord)arg1, (Coord)arg2) -> object :

    C++ signature :
        _object* __add__(mapnik::coord<double, 2> {lvalue},mapnik::coord<double, 2>)

__add__( (Coord)arg1, (float)arg2) -> object :

    C++ signature :
        _object* __add__(mapnik::coord<double, 2> {lvalue},float)

div(...)


__div__( (Coord)arg1, (float)arg2) -> object :

    C++ signature :
        _object* __div__(mapnik::coord<double, 2> {lvalue},float)

eq(...)
(Equality operator)


__eq__( (Coord)arg1, (Coord)arg2) -> object :

    C++ signature :
        _object* __eq__(mapnik::coord<double, 2> {lvalue},mapnik::coord<double, 2>)

getinitargs(...)


__getinitargs__( (Coord)arg1) -> tuple :

    C++ signature :
        boost::python::tuple __getinitargs__(mapnik::coord<double, 2>)

init(...)
(Constructor)


__init__( (object)arg1, (float)x, (float)y) -> None :
    Constructs a new point with the given coordinates.
    

    C++ signature :
        void __init__(_object*,double,double)

Overrides: object.__init__

mul(...)


__mul__( (Coord)arg1, (float)arg2) -> object :

    C++ signature :
        _object* __mul__(mapnik::coord<double, 2> {lvalue},float)

radd(...)
(Right-side addition operator)


__radd__( (Coord)arg1, (float)arg2) -> object :

    C++ signature :
        _object* __radd__(mapnik::coord<double, 2> {lvalue},float)

reduce(...)

helper for pickle

Overrides: object.__reduce__: (inherited documentation)

repr(self)
(Representation operator)

repr(x)

Overrides: object.__repr__: (inherited documentation)

rmul(...)


__rmul__( (Coord)arg1, (float)arg2) -> object :

    C++ signature :
        _object* __rmul__(mapnik::coord<double, 2> {lvalue},float)

sub(...)
(Subtraction operator)


__sub__( (Coord)arg1, (Coord)arg2) -> object :

    C++ signature :
        _object* __sub__(mapnik::coord<double, 2> {lvalue},mapnik::coord<double, 2>)

__sub__( (Coord)arg1, (float)arg2) -> object :

    C++ signature :
        _object* __sub__(mapnik::coord<double, 2> {lvalue},float)

forward(self, projection)


Projects the point from the geographic coordinate 
space  into the cartesian space. The x component is 
considered to be longitude, the y component the 
latitude.

Returns the easting (x) and northing (y) as a 
coordinate pair.

Example: Project the geographic coordinates of the 
         city center of Stuttgart into the local
         map projection (GK Zone 3/DHDN, EPSG 31467)  
>>> p = Projection('+init=epsg:31467') 
>>> Coord(9.1, 48.7).forward(p)
Coord(3507360.12813,5395719.2749)

inverse(self, projection)


Projects the point from the cartesian space 
into the geographic space. The x component is 
considered to be the easting, the y component 
to be the northing.

Returns the longitude (x) and latitude (y) as a 
coordinate pair.

Example: Project the cartesian coordinates of the 
         city center of Stuttgart in the local
         map projection (GK Zone 3/DHDN, EPSG 31467)
         into geographic coordinates:
>>> p = Projection('+init=epsg:31467') 
>>> Coord(3507360.12813,5395719.2749).inverse(p)
Coord(9.1, 48.7)

Property Details

x

Gets or sets the x/lon coordinate of the point.

Get Method:: unreachable(...)
Set Method:: unreachable(...)

y

Gets or sets the y/lat coordinate of the point.

Get Method:: unreachable(...)
Set Method:: unreachable(...)

Class Coord

__add__(...) (Addition operator)

__div__(...)

__eq__(...) (Equality operator)

__getinitargs__(...)

__init__(...) (Constructor)

__mul__(...)

__radd__(...) (Right-side addition operator)

__reduce__(...)

__repr__(self) (Representation operator)

__rmul__(...)

__sub__(...) (Subtraction operator)