altair.Projection

class altair.Projection(center=Undefined, clipAngle=Undefined, clipExtent=Undefined, coefficient=Undefined, distance=Undefined, extent=Undefined, fit=Undefined, fraction=Undefined, lobes=Undefined, parallel=Undefined, parallels=Undefined, pointRadius=Undefined, precision=Undefined, radius=Undefined, ratio=Undefined, reflectX=Undefined, reflectY=Undefined, rotate=Undefined, scale=Undefined, size=Undefined, spacing=Undefined, tilt=Undefined, translate=Undefined, type=Undefined, **kwds)

Projection schema wrapper

Mapping(required=[])

Attributes

centerVector2number

The projection’s center, a two-element array of longitude and latitude in degrees.

Default value: [0, 0]

clipAnglefloat

The projection’s clipping circle radius to the specified angle in degrees. If null, switches to antimeridian cutting rather than small-circle clipping.

clipExtentVector2Vector2number

The projection’s viewport clip extent to the specified bounds in pixels. The extent bounds are specified as an array [[x0, y0], [x1, y1]], where x0 is the left-side of the viewport, y0 is the top, x1 is the right and y1 is the bottom. If null, no viewport clipping is performed.

coefficientfloat

distancefloat

extentVector2Vector2number

fitanyOf(Fit, List(Fit))

fractionfloat

lobesfloat

parallelfloat

parallelsList(float)

For conic projections, the two standard parallels that define the map layout. The default depends on the specific conic projection used.

pointRadiusfloat

The default radius (in pixels) to use when drawing GeoJSON Point and MultiPoint geometries. This parameter sets a constant default value. To modify the point radius in response to data, see the corresponding parameter of the GeoPath and GeoShape transforms.

Default value: 4.5

precisionfloat

The threshold for the projection’s adaptive resampling to the specified value in pixels. This value corresponds to the Douglas–Peucker distance. If precision is not specified, returns the projection’s current resampling precision which defaults to √0.5 ≅ 0.70710….

radiusfloat

ratiofloat

reflectXboolean

reflectYboolean

rotateanyOf(Vector2number, Vector3number)

The projection’s three-axis rotation to the specified angles, which must be a two- or three-element array of numbers [ lambda, phi, gamma ] specifying the rotation angles in degrees about each spherical axis. (These correspond to yaw, pitch and roll.)

Default value: [0, 0, 0]

scalefloat

The projection’s scale (zoom) factor, overriding automatic fitting. The default scale is projection-specific. The scale factor corresponds linearly to the distance between projected points; however, scale factor values are not equivalent across projections.

sizeVector2number

spacingfloat

tiltfloat

translateVector2number

The projection’s translation offset as a two-element array [tx, ty].

typeProjectionType

The cartographic projection to use. This value is case-insensitive, for example "albers" and "Albers" indicate the same projection type. You can find all valid projection types in the documentation.

Default value: mercator

__init__(center=Undefined, clipAngle=Undefined, clipExtent=Undefined, coefficient=Undefined, distance=Undefined, extent=Undefined, fit=Undefined, fraction=Undefined, lobes=Undefined, parallel=Undefined, parallels=Undefined, pointRadius=Undefined, precision=Undefined, radius=Undefined, ratio=Undefined, reflectX=Undefined, reflectY=Undefined, rotate=Undefined, scale=Undefined, size=Undefined, spacing=Undefined, tilt=Undefined, translate=Undefined, type=Undefined, **kwds)

Methods

`__init__`([center, clipAngle, clipExtent, ...])
`copy`([deep, ignore])	Return a copy of the object
`from_dict`(dct[, validate, _wrapper_classes])	Construct class from a dictionary representation
`from_json`(json_string[, validate])	Instantiate the object from a valid JSON string
`resolve_references`([schema])	Resolve references in the context of this object's schema or root schema.
`to_dict`([validate, ignore, context])	Return a dictionary representation of the object
`to_json`([validate, ignore, context, indent, ...])	Emit the JSON representation for this object as a string.
`validate`(instance[, schema])	Validate the instance against the class schema in the context of the rootschema.
`validate_property`(name, value[, schema])	Validate a property against property schema in the context of the rootschema