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36 lines
939 B
TypeScript
36 lines
939 B
TypeScript
import {
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DEFAULT_TOTAL_WIDTH,
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MAJOR_TICK_GAP,
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MID_TICK_GAP,
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MINOR_TICK_GAP,
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type Tick,
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} from "../models/ruler";
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import { normalizeTotalWidth } from "./segmentService";
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const tickCache = new Map<number, Tick[]>();
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/**
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* 生成标尺刻度数据，并按 totalWidth 做缓存复用。
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*/
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export function buildTicks(totalWidth: number = DEFAULT_TOTAL_WIDTH): Tick[] {
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const safeTotalWidth = normalizeTotalWidth(totalWidth);
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const cachedTicks = tickCache.get(safeTotalWidth);
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if (cachedTicks) {
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return cachedTicks;
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}
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const ticks: Tick[] = [];
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for (let x = 0; x <= safeTotalWidth; x += MINOR_TICK_GAP) {
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if (x % MAJOR_TICK_GAP === 0) {
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ticks.push({ x, type: "major", label: String(x) });
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} else if (x % MAJOR_TICK_GAP === MID_TICK_GAP) {
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ticks.push({ x, type: "mid" });
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} else {
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ticks.push({ x, type: "minor" });
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}
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}
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tickCache.set(safeTotalWidth, ticks);
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return ticks;
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}
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