previewRulerUnits.ts
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import { unitToPx } from "./labelTemplateUnits";
/** 预览区标尺显示单位（与模板 `template.unit` 独立，仅影响刻度与读数） */
export type PreviewRulerDisplayUnit = "cm" | "mm" | "inch";
/** 将长度从模板单位换算到预览标尺显示单位 */
export function convertTemplateLengthToDisplay(
value: number,
templateUnit: "cm" | "inch",
displayUnit: PreviewRulerDisplayUnit,
): number {
if (!Number.isFinite(value)) return 0;
const cm = templateUnit === "cm" ? value : value * 2.54;
if (displayUnit === "cm") return cm;
if (displayUnit === "mm") return cm * 10;
return cm / 2.54;
}
/** 预览标尺显示单位 → 模板单位 */
export function convertDisplayLengthToTemplate(
displayValue: number,
templateUnit: "cm" | "inch",
displayUnit: PreviewRulerDisplayUnit,
): number {
if (!Number.isFinite(displayValue)) return 0;
let cm: number;
if (displayUnit === "cm") cm = displayValue;
else if (displayUnit === "mm") cm = displayValue / 10;
else cm = displayValue * 2.54;
if (templateUnit === "cm") return cm;
return cm / 2.54;
}
export function elementPxToDisplayLength(
lengthPx: number,
basePaperPx: number,
paperSizeTemplate: number,
templateUnit: "cm" | "inch",
displayUnit: PreviewRulerDisplayUnit,
): number {
if (!Number.isFinite(lengthPx) || !Number.isFinite(basePaperPx) || basePaperPx <= 0) return 0;
const inTemplate = (lengthPx / basePaperPx) * paperSizeTemplate;
return convertTemplateLengthToDisplay(inTemplate, templateUnit, displayUnit);
}
export function displayLengthToElementPx(
displayValue: number,
basePaperPx: number,
paperSizeTemplate: number,
templateUnit: "cm" | "inch",
displayUnit: PreviewRulerDisplayUnit,
): number {
if (!Number.isFinite(basePaperPx) || basePaperPx <= 0 || !Number.isFinite(paperSizeTemplate) || paperSizeTemplate <= 0) {
return 0;
}
const inTemplate = convertDisplayLengthToTemplate(displayValue, templateUnit, displayUnit);
return (inTemplate / paperSizeTemplate) * basePaperPx;
}
export function formatPreviewRulerDisplayValue(
value: number,
displayUnit: PreviewRulerDisplayUnit,
): string {
if (!Number.isFinite(value)) return "";
if (displayUnit === "mm") return String(Math.round(value * 10) / 10);
if (displayUnit === "inch") return value.toFixed(4);
return (Math.round(value * 1000) / 1000).toFixed(3);
}
export function previewRulerUnitLabel(displayUnit: PreviewRulerDisplayUnit): string {
return displayUnit;
}
export function templatePaperBasePx(
width: number,
height: number,
unit: "cm" | "inch",
): { baseW: number; baseH: number } {
return {
baseW: unitToPx(Number(width) || 0, unit),
baseH: unitToPx(Number(height) || 0, unit),
};
}