PDFlib Cookbook

cookbook

fonts/font_metrics_info

Query various font-related metrics such as ascender or descender.

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/*
 * Font metrics info:
 * Get various font related metrics such as the ascender or descender
 *
 * Use the info_font() function to get the metrics values for the capheight,
 * ascender, descender, or xheight of the font. Visualize these metrics
 * using the "matchbox" feature.
 *
 * Required software: PDFlib/PDFlib+PDI/PPS 9
 * Required data: font file
 */
package com.pdflib.cookbook.pdflib.fonts;

import com.pdflib.pdflib;
import com.pdflib.PDFlibException; 
import java.util.Locale;
 
public class font_metrics_info
{
    public static void main (String argv[])
    {
        /* This is where the data files are. Adjust as necessary. */
        String searchpath = "../input";
        String outfile = "font_metrics_info.pdf";
        String title = "Font Metrics Info";

        pdflib p = null;
        int font;
        double capheight, ascender, descender, xheight;
        String optlist, text = "ABCdefghij";
        int x=150, y=140;
        int exitcode = 0;


        Locale.setDefault(Locale.US); 
        try {
            p = new pdflib();

            p.set_option("searchpath={" + searchpath + "}");

            /* This means we must check return values of load_font() etc. */
            p.set_option("errorpolicy=return");

            if (p.begin_document(outfile, "") == -1)
                throw new Exception("Error: " + p.get_errmsg());

            p.set_info("Creator", "PDFlib Cookbook");
            p.set_info("Title", title);

            /* Start page */
            p.begin_page_ext(0, 0, "width=300 height=200");

            font = p.load_font("NotoSerif-Regular", "unicode", "embedding");
            if (font == -1)
                throw new Exception("Error: " + p.get_errmsg());

            /* Retrieve the font metrics for a font size of 10. If no fontsize
             * is supplied the metrics will be based on a font size of 1000.
             */
            capheight = p.info_font(font, "capheight", "fontsize=10");
            ascender = p.info_font(font, "ascender", "fontsize=10");
            descender = p.info_font(font, "descender", "fontsize=10");
            xheight = p.info_font(font, "xheight", "fontsize=10");

            p.setfont(font, 10);

            /* Output each of the font metrics with appropriate formatting as well
             * as the sample text "ABCdefghij" with the metrics value colorized
             */

            p.fit_textline("capheight for font size 10: " + String.format("%.2f",capheight),
                x, y, "alignchar :");
            optlist = "matchbox={fillcolor={rgb 1 0.8 0.8} " + 
                "boxheight={capheight none}}";
            p.fit_textline(text, x+60, y, optlist);

            p.fit_textline("ascender for font size 10: " + String.format("%.2f", ascender),
                x, y-=30, "alignchar :");
            optlist = "matchbox={fillcolor={rgb 1 0.8 0.8} " + 
                "boxheight={ascender none}}";
            p.fit_textline(text, x+60, y, optlist);

            p.fit_textline("descender for font size 10: " + String.format("%.2f", descender),
                x, y-=30, "alignchar :");
            optlist = "matchbox={fillcolor={rgb 1 0.8 0.8} " + 
                "boxheight={none descender}}";
            p.fit_textline(text, x+60, y, optlist);

            p.fit_textline("xheight for font size 10: " + String.format("%.1f", xheight),
                x, y-=30, "alignchar :");
            optlist = "matchbox={fillcolor={rgb 1 0.8 0.8} " +
                "boxheight={xheight none}}";
            p.fit_textline(text, x+60, y, optlist);

            /* Finish page */
            p.end_page_ext("");

            p.end_document("");

        } catch (PDFlibException e) {
            System.err.println("PDFlib exception occurred:");
            System.err.println("[" + e.get_errnum() + "] " + e.get_apiname() +
                ": " + e.get_errmsg());
            exitcode = 1;
        } catch (Exception e) {
            System.err.println(e);
            exitcode = 1;
        } finally {
            if (p != null) {
                p.delete();
            }
            System.exit(exitcode);
        }
    }
}