altair.SecondaryFieldDef#
- class altair.SecondaryFieldDef(shorthand=Undefined, aggregate=Undefined, bandPosition=Undefined, bin=Undefined, field=Undefined, timeUnit=Undefined, title=Undefined, **kwds)#
SecondaryFieldDef schema 包装器。
这是 secondary channel 的字段定义,它与另一个 primary channel 共享同一比例尺。例如,
x2
、xError
和xError2
与x
共享同一比例尺。- 参数:
- shorthandstr, dict, Sequence[str],
RepeatRef
field、aggregate 和 type 的简写形式
- aggregatedict,
Aggregate
,ArgmaxDef
,ArgminDef
,NonArgAggregateOp
, Literal[‘average’, ‘count’, ‘distinct’, ‘max’, ‘mean’, ‘median’, ‘min’, ‘missing’, ‘product’, ‘q1’, ‘q3’, ‘ci0’, ‘ci1’, ‘stderr’, ‘stdev’, ‘stdevp’, ‘sum’, ‘valid’, ‘values’, ‘variance’, ‘variancep’, ‘exponential’, ‘exponentialb’] 字段的聚合函数(例如,
"mean"
、"sum"
、"median"
、"min"
、"max"
、"count"
)。默认值:
undefined
(None)另见: aggregate 文档。
- bandPositionfloat
在堆叠、分箱、时间单位或 band scale 的条带上的相对位置。例如,如果设置为
0
,标记将位于条带的起始位置;如果设置为0.5
,则位于条带的中间位置。- binNone
一个标志,用于对
quantitative
字段进行分箱,或一个定义分箱参数的对象,或指示x
或y
channel 的数据在导入 Vega-Lite 之前已经过分箱处理("binned"
)。如果为
true
,将应用默认的分箱参数。如果为
"binned"
,这表示x
(或y
)channel 的数据已经过分箱处理。可以将分箱起始字段映射到x
(或y
),将分箱结束字段映射到x2
(或y2
)。比例尺和坐标轴将格式化得与 Vega-Lite 中的分箱类似。要根据分箱步长调整坐标轴刻度,还可以设置坐标轴的 tickMinStep 属性。
默认值:
false
另见: bin 文档。
- fieldstr, dict,
Field
,FieldName
,RepeatRef
必需。 一个字符串,定义从中提取数据值的字段名称,或一个定义 repeat 运算符迭代值的对象。
另见: field 文档。
注意: 1) 点(
.
)和方括号([
和]
)可用于访问嵌套对象(例如,"field": "foo.bar"
和"field": "foo['bar']"
)。如果字段名包含点或方括号但未嵌套,可以使用\\
对点和方括号进行转义(例如,"a\\.b"
和"a\\[0\\]"
)。有关转义的更多详细信息,请参见field 文档。 2) 如果aggregate
为count
,则不需要field
。- timeUnitdict,
TimeUnit
,MultiTimeUnit
,BinnedTimeUnit
,SingleTimeUnit
,TimeUnitParams
,UtcMultiTimeUnit
,UtcSingleTimeUnit
,LocalMultiTimeUnit
,LocalSingleTimeUnit
, Literal[‘binnedutcyear’, ‘binnedutcyearquarter’, ‘binnedutcyearquartermonth’, ‘binnedutcyearmonth’, ‘binnedutcyearmonthdate’, ‘binnedutcyearmonthdatehours’, ‘binnedutcyearmonthdatehoursminutes’, ‘binnedutcyearmonthdatehoursminutesseconds’, ‘binnedutcyearweek’, ‘binnedutcyearweekday’, ‘binnedutcyearweekdayhours’, ‘binnedutcyearweekdayhoursminutes’, ‘binnedutcyearweekdayhoursminutesseconds’, ‘binnedutcyeardayofyear’, ‘binnedyear’, ‘binnedyearquarter’, ‘binnedyearquartermonth’, ‘binnedyearmonth’, ‘binnedyearmonthdate’, ‘binnedyearmonthdatehours’, ‘binnedyearmonthdatehoursminutes’, ‘binnedyearmonthdatehoursminutesseconds’, ‘binnedyearweek’, ‘binnedyearweekday’, ‘binnedyearweekdayhours’, ‘binnedyearweekdayhoursminutes’, ‘binnedyearweekdayhoursminutesseconds’, ‘binnedyeardayofyear’, ‘utcyear’, ‘utcquarter’, ‘utcmonth’, ‘utcweek’, ‘utcday’, ‘utcdayofyear’, ‘utcdate’, ‘utchours’, ‘utcminutes’, ‘utcseconds’, ‘utcmilliseconds’, ‘year’, ‘quarter’, ‘month’, ‘week’, ‘day’, ‘dayofyear’, ‘date’, ‘hours’, ‘minutes’, ‘seconds’, ‘milliseconds’, ‘utcyearquarter’, ‘utcyearquartermonth’, ‘utcyearmonth’, ‘utcyearmonthdate’, ‘utcyearmonthdatehours’, ‘utcyearmonthdatehoursminutes’, ‘utcyearmonthdatehoursminutesseconds’, ‘utcyearweek’, ‘utcyearweekday’, ‘utcyearweekdayhours’, ‘utcyearweekdayhoursminutes’, ‘utcyearweekdayhoursminutesseconds’, ‘utcyeardayofyear’, ‘utcquartermonth’, ‘utcmonthdate’, ‘utcmonthdatehours’, ‘utcmonthdatehoursminutes’, ‘utcmonthdatehoursminutesseconds’, ‘utcweekday’, ‘utcweekdayhours’, ‘utcweekdayhoursminutes’, ‘utcweekdayhoursminutesseconds’, ‘utcdayhours’, ‘utcdayhoursminutes’, ‘utcdayhoursminutesseconds’, ‘utchoursminutes’, ‘utchoursminutesseconds’, ‘utcminutesseconds’, ‘utcsecondsmilliseconds’, ‘yearquarter’, ‘yearquartermonth’, ‘yearmonth’, ‘yearmonthdate’, ‘yearmonthdatehours’, ‘yearmonthdatehoursminutes’, ‘yearmonthdatehoursminutesseconds’, ‘yearweek’, ‘yearweekday’, ‘yearweekdayhours’, ‘yearweekdayhoursminutes’, ‘yearweekdayhoursminutesseconds’, ‘yeardayofyear’, ‘quartermonth’, ‘monthdate’, ‘monthdatehours’, ‘monthdatehoursminutes’, ‘monthdatehoursminutesseconds’, ‘weekday’, ‘weekdayhours’, ‘weekdayhoursminutes’, ‘weekdayhoursminutesseconds’, ‘dayhours’, ‘dayhoursminutes’, ‘dayhoursminutesseconds’, ‘hoursminutes’, ‘hoursminutesseconds’, ‘minutesseconds’, ‘secondsmilliseconds’] temporal 字段的时间单位(例如,
year
、yearmonth
、month
、hours
),或转换为 ordinal 类型的 temporal 字段。默认值:
undefined
(None)另见: timeUnit 文档。
- titlestr,
Text
, Sequence[str], None 字段的标题。如果为
null
,则移除标题。默认值: 从字段名称和转换函数(
aggregate
、bin
和timeUnit
)派生。如果字段有聚合函数,该函数将显示为标题的一部分(例如,"Sum of Profit"
)。如果字段经过分箱或应用了时间单位,应用函数将显示在括号中(例如,"Profit (binned)"
、"Transaction Date (year-month)"
)。否则,标题仅为字段名称。注意:
1) 您可以通过在 config 中提供 fieldTitle 属性或通过 compile 函数的 options 中的 fieldTitle 函数来自定义默认的字段标题格式。
2) 如果同时定义了字段定义的
title
和 axis、header 或 legend 的title
,将使用 axis/header/legend 的标题。
- shorthandstr, dict, Sequence[str],
- __init__(shorthand=Undefined, aggregate=Undefined, bandPosition=Undefined, bin=Undefined, field=Undefined, timeUnit=Undefined, title=Undefined, **kwds)#
方法
__init__
([shorthand, aggregate, ...])copy
([deep, ignore])返回对象的副本。
from_dict
(dct[, validate])从字典表示形式构造类。
from_json
(json_string[, validate])从有效的 JSON 字符串实例化对象。
resolve_references
([schema])在此对象的 schema 或 root schema 上下文中解析引用。
to_dict
([validate, ignore, context])返回对象的字典表示形式。
to_json
([validate, indent, sort_keys, ...])将此对象的 JSON 表示形式作为字符串输出。
validate
(instance[, schema])在 rootschema 的上下文中根据类 schema 验证实例。
validate_property
(name, value[, schema])在 rootschema 的上下文中根据属性 schema 验证属性。