@pdfme/pdf-lib/dist/node/__tests__/api/text/layout.spec.js

Create and modify PDF files with JavaScript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const index_1 = require("../../../src/index");
const layout_1 = require("../../../src/api/text/layout");
const MIN_FONT_SIZE = 4;
const MAX_FONT_SIZE = 500;
describe(`layoutMultilineText`, () => {
    it('should layout the text on one line when it fits near-perfectly', async () => {
        const pdfDoc = await index_1.PDFDocument.create();
        const font = await pdfDoc.embedFont(index_1.StandardFonts.Helvetica);
        const alignment = index_1.TextAlignment.Left;
        const padding = 0;
        const borderWidth = 0;
        const text = 'Super Mario Bros.';
        for (let fontSize = MIN_FONT_SIZE; fontSize <= MAX_FONT_SIZE; fontSize++) {
            const height = font.heightAtSize(fontSize) - (borderWidth + padding) * 2;
            const width = font.widthOfTextAtSize(text, fontSize) - (borderWidth + padding) * 2;
            const bounds = {
                x: borderWidth + padding,
                y: borderWidth + padding,
                width,
                height,
            };
            const multilineTextLayout = (0, layout_1.layoutMultilineText)(text, {
                alignment,
                bounds,
                font,
            });
            expect(multilineTextLayout.lines.length).toStrictEqual(1);
        }
    });
    it('should layout the text on one line when it fits comfortably', async () => {
        const pdfDoc = await index_1.PDFDocument.create();
        const font = await pdfDoc.embedFont(index_1.StandardFonts.Helvetica);
        const alignment = index_1.TextAlignment.Left;
        const padding = 0;
        const borderWidth = 0;
        const text = 'Super Mario Bros.';
        const fontSize = 12;
        const height = font.heightAtSize(fontSize) - (borderWidth + padding) * 2;
        // Bounds width twice that of the text
        const width = (font.widthOfTextAtSize(text, fontSize) - (borderWidth + padding) * 2) *
            2;
        const bounds = {
            x: borderWidth + padding,
            y: borderWidth + padding,
            width,
            height,
        };
        const multilineTextLayout = (0, layout_1.layoutMultilineText)(text, {
            alignment,
            bounds,
            font,
        });
        expect(multilineTextLayout.lines.length).toStrictEqual(1);
    });
    it('should layout the text on multiple lines when it does not fit horizontally but there is space vertically', async () => {
        const pdfDoc = await index_1.PDFDocument.create();
        const font = await pdfDoc.embedFont(index_1.StandardFonts.Helvetica);
        const alignment = index_1.TextAlignment.Left;
        const padding = 0;
        const borderWidth = 0;
        const text = 'Super Mario Bros.';
        for (let fontSize = MIN_FONT_SIZE; fontSize <= MAX_FONT_SIZE; fontSize++) {
            // Height twice that of the text
            const height = (font.heightAtSize(fontSize) - (borderWidth + padding) * 2) * 2;
            // Width half that of the text
            const width = (font.widthOfTextAtSize(text, fontSize) - (borderWidth + padding) * 2) /
                2;
            const bounds = {
                x: borderWidth + padding,
                y: borderWidth + padding,
                width,
                height,
            };
            const multilineTextLayout = (0, layout_1.layoutMultilineText)(text, {
                alignment,
                bounds,
                font,
            });
            expect(multilineTextLayout.lines.length).toStrictEqual(2);
        }
    });
    it('should never exceed the maximum font size', async () => {
        const pdfDoc = await index_1.PDFDocument.create();
        const font = await pdfDoc.embedFont(index_1.StandardFonts.Helvetica);
        const alignment = index_1.TextAlignment.Left;
        const padding = 0;
        const borderWidth = 0;
        const text = 'Super Mario Bros.';
        const height = Number.MAX_VALUE;
        const width = Number.MAX_VALUE;
        const bounds = {
            x: borderWidth + padding,
            y: borderWidth + padding,
            width,
            height,
        };
        const multilineTextLayout = (0, layout_1.layoutMultilineText)(text, {
            alignment,
            bounds,
            font,
        });
        expect(multilineTextLayout.lines.length).toStrictEqual(1);
        expect(multilineTextLayout.fontSize).toStrictEqual(MAX_FONT_SIZE);
    });
    it('should respect empty lines', async () => {
        const pdfDoc = await index_1.PDFDocument.create();
        const font = await pdfDoc.embedFont(index_1.StandardFonts.Helvetica);
        const alignment = index_1.TextAlignment.Left;
        const padding = 0;
        const borderWidth = 0;
        const lines = ['Super Mario Bros.', '', 'Boop'];
        const text = lines.join('\n');
        for (let fontSize = MIN_FONT_SIZE; fontSize <= MAX_FONT_SIZE; fontSize++) {
            const height = font.heightAtSize(fontSize) - (borderWidth + padding) * 2;
            const width = font.widthOfTextAtSize(lines[0], fontSize) -
                (borderWidth + padding) * 2;
            const bounds = {
                x: borderWidth + padding,
                y: borderWidth + padding,
                width,
                height,
            };
            const multilineTextLayout = (0, layout_1.layoutMultilineText)(text, {
                alignment,
                bounds,
                font,
            });
            expect(multilineTextLayout.lines.length).toStrictEqual(3);
        }
    });
});
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