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54 lines
1.7 KiB
54 lines
1.7 KiB
import { Band } from './band';
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import { defaultUnknown } from './ordinal';
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/**
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* Point 比例尺
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*
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* 一种特殊的 band scale，它的 bandWidth 恒为 0。
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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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* PO = Padding = PaddingInner
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* domain = ["A", "B", "C"]
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*
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* |<------------------------------------------- range ------------------------------------------->|
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* | | | | |
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* |<--step*PO-->|<--------------step------------->|<--------------step------------->|<--step*PO-->|
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* | | | | |
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* | A B C |
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* |-----------------------------------------------------------------------------------------------|
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*
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* 性能方便较 d3 快出 8 - 9 倍
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*/
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export class Point extends Band {
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// 覆盖默认配置
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getDefaultOptions() {
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return {
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domain: [],
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range: [0, 1],
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align: 0.5,
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round: false,
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padding: 0,
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unknown: defaultUnknown,
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paddingInner: 1,
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paddingOuter: 0,
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};
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}
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// 能接受的参数只是 PointOptions，不能有 paddingInner 这些属性
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constructor(options) {
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super(options);
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}
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// Point 的 paddingInner 只能是1，不能被覆盖
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getPaddingInner() {
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return 1;
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}
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clone() {
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return new Point(this.options);
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}
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update(options) {
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super.update(options);
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}
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getPaddingOuter() {
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return this.options.padding;
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}
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}
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//# sourceMappingURL=point.js.map
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