37 lines
1.1 KiB
TypeScript
37 lines
1.1 KiB
TypeScript
export type PageFormatId = "a4" | "letter" | "legal" | "a5" | "tabloid"
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export type PageFormat = {
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id: PageFormatId
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label: string
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widthMm: number
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heightMm: number
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}
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/** 96 CSS px per inch, 25.4 mm per inch */
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export const MM_TO_PX = 96 / 25.4
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export const PAGE_FORMATS: PageFormat[] = [
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{ id: "a4", label: "A4", widthMm: 210, heightMm: 297 },
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{ id: "letter", label: "Letter", widthMm: 216, heightMm: 279 },
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{ id: "legal", label: "Legal", widthMm: 216, heightMm: 356 },
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{ id: "a5", label: "A5", widthMm: 148, heightMm: 210 },
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{ id: "tabloid", label: "Tabloid", widthMm: 279, heightMm: 432 },
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]
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export const DEFAULT_PAGE_FORMAT_ID: PageFormatId = "a4"
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export function getPageFormat(id: PageFormatId): PageFormat {
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return PAGE_FORMATS.find((f) => f.id === id) ?? PAGE_FORMATS[0]!
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}
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export function pageFormatWidthPx(format: PageFormat): number {
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return Math.round(format.widthMm * MM_TO_PX)
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}
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export function pageFormatHeightPx(format: PageFormat): number {
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return Math.round(format.heightMm * MM_TO_PX)
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}
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/** Approximate print margins (1 inch) */
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export const PAGE_MARGIN_PX = Math.round(25.4 * MM_TO_PX)
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