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44 lines
1.9 KiB
44 lines
1.9 KiB
import { BandOptions, Domain } from '../types';
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import { Ordinal } from './ordinal';
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/**
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* Band 比例尺
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*
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* 一种特殊的 ordinal scale，区别在于值域的范围是连续的。
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* 使用的场景例如柱状图，可以用来定位各个柱子水平方向距离原点开始绘制的距离、各柱子之间的间距
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*
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* 由于部分选项较为抽象，见下图描述：
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*
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* BN = bandWidthN
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* SN = stepN
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* domain = [A, B]
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*
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* 约束关系如下
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* width = PO + B1 + PI + B2 + PI ... + BN + PO;
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* PO = (S1 + S2 + ... SN) / N * paddingOuter
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* PI = (S1 + S2 + ... SN) / N * paddingInner
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* BN / BN-1 = flex[n] / flex[n-1]
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*
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* |<------------------------------------------- range ------------------------------------------->|
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* | | | | | | |
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* |<-----PO---->|<------B1--------->|<-----PI---->|<-------B2-------->|<----PI----->|<-----PO---->|
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* | | ***************** | | ***************** | | |
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* | | ******* A ******* | | ******* B ******* | | |
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* | | ***************** | | ***************** | | |
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* | |<--------------S1--------------->| <--------------S2-------------->| |
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* |-----------------------------------------------------------------------------------------------|
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*
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*/
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export declare class Band<O extends BandOptions = BandOptions> extends Ordinal<O> {
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private adjustedRange;
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private valueBandWidth;
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private valueStep;
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protected getDefaultOptions(): O;
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constructor(options?: BandOptions);
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clone(): Band<O>;
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getStep(x?: Domain<BandOptions>): any;
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getBandWidth(x?: Domain<BandOptions>): any;
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getRange(): O["range"];
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protected getPaddingInner(): number;
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protected getPaddingOuter(): number;
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protected rescale(): void;
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}
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