PDFlib Cookbook

cookbook

table/colorize_cells

Provide some table cells with a colored background.

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/*
 * Colorize cells:
 * Provide some table cells with a colored background.
 * 
 * Create a table and use matchboxes to provide some table cells with a 
 * colored background.
 * 
 * Required software: PDFlib/PDFlib+PDI/PPS 9
 * Required data: none
 */
package com.pdflib.cookbook.pdflib.table;

import com.pdflib.pdflib;
import com.pdflib.PDFlibException;

public class colorize_cells
{
    public static void main (String argv[])
    {
        /* This is where the data files are. Adjust as necessary. */
        String searchpath = "../input";
        String outfile = "colorize_cells.pdf";
        String title = "Colorize cells";

        pdflib p = null;
        int nrows = 4, row, font, tbl=-1;
        String optlist, result;
        
        final int margin = 3;
        final int fontsize = 12;
        int exitcode = 0;
        
        /* Height of a table row which is the sum of a font size of 12 and the upper
         * and lower cell margin of 3 each
         */
        int rowheight = 18;
        
        /* Width of the first and second column of the table */
        final int c1 = 120, c2 = 120;
        
        /* Coordinates of the lower left corner of the table fitbox */
        final double llx = 30, lly = 400;
        
        /* Color names */
        final String names[] = { "Chocolate", "CornflowerBlue", "Gold" };
        
        /* RGB color values used in PDFlib in the range 0...1. They are calculated
         * by dividing the RGB value by 255. For example, a PDFlib value of
         * (0.82 0.4 0.1) corresponds to an RGB value of (210 105 30) since
         * 0.82 = 210/255, 0.4 = 105/255, and 0.1 = 30/255.
         */
        final String pdflib[] =  { "0.82 0.4 0.1", "0.4 0.58 0.93", "1 0.84 0" };
        
        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);

            /* Load the font */
            font = p.load_font("Helvetica", "unicode", "");
            if (font == -1)
                    throw new Exception("Error: " + p.get_errmsg());

            p.begin_page_ext(0, 0, "width=a5.width height=a5.height");
            
            
            /* ---------------------------------------
             * Add a heading line spanning two columns
             * ---------------------------------------
             */
            
            /* Set the current row */
            row = 1;
            
            optlist = "fittextline={font=" + font + " fontsize=" + fontsize +
                " position=center} rowheight=" + rowheight + " margin=" + margin +
                " colspan=2 " + "colwidth=" + c1;

            tbl = p.add_table_cell(tbl, 1, row, "Color Table", optlist);
            if (tbl == -1)
                throw new Exception("Error: " + p.get_errmsg());
            
            
            /* ---------------------------------------------------------------
             * Adding two cells in the second, third, and fifth table row each
             * ---------------------------------------------------------------
             */
            
            for (row = 2; row <= 4; row++)
            {
                /* Adding a cell in the first column of the current row.
                 * The text line is centered horizontally, with a margin
                 * from all borders. 
                 */
                optlist = "fittextline={font=" + font + " fontsize=" + fontsize +
                    " position={left center}} rowheight=" + rowheight + 
                    " margin=" + margin + " colwidth=" + c1;

                tbl = p.add_table_cell(tbl, 1, row, names[row-2], optlist);
                if (tbl == -1)
                    throw new Exception("Error: " + p.get_errmsg());
     
            
                /* ----------------------------------
                 * Adding a cell in the second column
                 * ----------------------------------
                 *
                 * The cell is placed in the second column of the current row.
                 * Since the cell doesn't cover a complete row but only one column
                 * it cannot be filled with color using one of the row-based shading
                 * options. We apply the Matchbox feature instead to fill the
                 * rectangle covered by the cell with a gray background color. 
                 */
                optlist = "colwidth=" + c2 + " margin=" + margin +
                    " matchbox={fillcolor={rgb " + pdflib[row-2] + "}}";
            
                tbl = p.add_table_cell(tbl, 2, row, "", optlist);
                if (tbl == -1)
                    throw new Exception("Error: " + p.get_errmsg());
            } /* for */
            
            
            /* -------------
             * Fit the table
             * -------------
             * 
             * Using "header=1" the table header will include the first line.
             * Using "line=horother linewidth=0.3" the ruling is specified with a
             * line width of 0.3 for all horizontal lines.
             */
            optlist = "header=1 stroke={ {line=horother linewidth=0.3}}";
            
            result = p.fit_table(tbl, llx, lly, llx + c1 + c2, 
                lly + nrows * rowheight, optlist);
            
            /* Check the result; "_stop" means all is ok */
            if (!result.equals("_stop")) {
                if (result.equals( "_error"))
                    throw new Exception("Error: " + p.get_errmsg());
                else {
                    /* Other return values require dedicated code to deal with */
                }
            }
            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);
        }
    }
}