pdf2json/lib/pdfline.js

PDF file parser that converts PDF binaries to JSON and text, powered by porting a fork of PDF.JS to Node.js

import nodeUtil from "util";
import PDFUnit from "./pdfunit.js";

export default class PDFLine {
    constructor(x1, y1, x2, y2, lineWidth, color, dashed) {
        this.x1 = x1;
        this.y1 = y1;
        this.x2 = x2;
        this.y2 = y2;
        this.lineWidth = lineWidth || 1.0;
        this.color = color;
        this.dashed = dashed;
    }

    #setStartPoint(oneLine, x, y) {
        oneLine.x = PDFUnit.toFormX(x);
        oneLine.y = PDFUnit.toFormY(y);
    }

    processLine(targetData) {
        const xDelta = Math.abs(this.x2 - this.x1);
        const yDelta = Math.abs(this.y2 - this.y1);
        const minDelta = this.lineWidth;

        let oneLine = { x:0, y:0, w: PDFUnit.toFixedFloat(this.lineWidth), l:0 };

        //MQZ Aug.28.2013, adding color support, using color dictionary and default to black
        const clrId = PDFUnit.findColorIndex(this.color);
        const colorObj = (clrId > 0 && clrId < PDFUnit.colorCount()) ? { clr: clrId } : { oc: this.color };
        oneLine = { ...oneLine, ...colorObj };

        //MQZ Aug.29 dashed line support
        if (this.dashed) {
            oneLine = { ...oneLine, dsh: 1 };
        }

        if ((yDelta < this.lineWidth) && (xDelta > minDelta)) { //HLine
            if (this.lineWidth < 4 && (xDelta / this.lineWidth < 4)) {
                nodeUtil.p2jinfo(`Skipped: short thick HLine: lineWidth = ${this.lineWidth}, xDelta = ${xDelta}`);
                return; //skip short thick lines, like PA SPP lines behinds checkbox
            }

            oneLine.l = PDFUnit.toFormX(xDelta);
            if (this.x1 > this.x2)
                this.#setStartPoint(oneLine, this.x2, this.y2);
            else
                this.#setStartPoint(oneLine, this.x1, this.y1);
            targetData.HLines.push(oneLine);
        }
        else if ((xDelta < this.lineWidth) && (yDelta > minDelta)) {//VLine
            if (this.lineWidth < 4 && (yDelta / this.lineWidth < 4)) {
                nodeUtil.p2jinfo(`Skipped: short thick VLine: lineWidth = ${this.lineWidth}, yDelta = ${yDelta}`);
                return; //skip short think lines, like PA SPP lines behinds checkbox
            }

            oneLine.l = PDFUnit.toFormY(yDelta);
            if (this.y1 > this.y2)
                this.#setStartPoint(oneLine, this.x2, this.y2);
            else
                this.#setStartPoint(oneLine, this.x1, this.y1);
            targetData.VLines.push(oneLine);
        }
    }
}