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color/spot_color_shading

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/*

 * Shadings with N=2/3/4 Pantone spot colors as stop colors

 * PDFlib automatically creates a suitable DeviceN color space in which

 * a shading between multiple spot colors can be expressed.

 *

 * Required software: PDFlib/PDFlib+PDI/PPS 9.1.1

 * (in older PDFlib versions the shading() method will complain

 * "Color spaces of shading's colors must not be different")

 *

 * Required data: none

 */

package com.pdflib.cookbook.pdflib.color;


import com.pdflib.pdflib;

import com.pdflib.PDFlibException;


public class spot_color_shading {

    public static void main(String argv[]) {

        /* This is where the data files are. Adjust as necessary. */

        String searchpath = "../input";

        String outfile = "spot_color_shading.pdf";

        String title = "Spot color shading";


        pdflib p = null;

        int font, sh, shp;

        int y = 600, x = 30, width = 700, height = 50, fontsize = 14,

                leading = 21;

        int exitcode = 0;


        try {

            p = new pdflib();


            int version = 100 * (int) p.get_option("major", "")

                            + 10 * (int) p.get_option("minor", "")

                            + (int) p.get_option("revision", "");


            if (version < 911) {

                throw new Exception(

                        "Error: spot_color_shading requires PDFlib 9.1.1 or newer");

            }


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


            /* This means that errors in load_font() etc. throw an exception */

            p.set_option("errorpolicy=exception");


            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-Bold", "unicode", "");


            /* Start the page */

            p.begin_page_ext(0, 0, "width=a4.height height=a4.width");


            p.setfont(font, fontsize);


            /*

             * *******************************************************

             * Define a shading color based on two Pantone spot colors

             */

            p.fit_textline(

                    "Shading with spot colors PANTONE 123 U, PANTONE 289 U:", x,

                    y -= 2 * leading, "fillcolor=black");


            y -= height + fontsize;


            /* Create axial shading based on two Pantone spot colors */

            sh = p.shading("axial", x, y, x + width, y, 0, 0, 0, 0,

                    "startcolor={spotname {PANTONE 123 U} 1} "

                            + "  endcolor={spotname {PANTONE 289 U} 1}");


            shp = p.shading_pattern(sh, "");

            p.set_graphics_option("fillcolor={pattern " + shp + "}");


            /* Fill a rectangle with the shading */

            p.rect(x, y, width, height);

            p.fill();


            /*

             * *******************************************************

             * Define a shading based on three Pantone spot colors

             */

            p.fit_textline(

                    "Shading with spot colors PANTONE 123 U, PANTONE 289 U, PANTONE Rubine Red U:",

                    x, y -= 2 * leading, "fillcolor=black");


            y -= height + fontsize;


            /*

             * Create axial shading based on three Pantone spot colors, using

             * 100% of each component at 0%, 50%, 100%, respectively.

             */

            sh = p.shading("axial", x, y, x + width, y, 0, 0, 0, 0,

                    "stopcolors={  0%  {spotname {PANTONE 123 U} 1} "

                            + " 50%  {spotname {PANTONE 289 U} 1} "

                            + "100%  {spotname {PANTONE Rubine Red U} 1} }");


            shp = p.shading_pattern(sh, "");

            p.set_graphics_option("fillcolor={pattern " + shp + "}");


            /* Fill a rectangle with the shading */

            p.rect(x, y, width, height);

            p.fill();


            /*

             * *******************************************************

             * Define a shading based on four Pantone spot colors

             */

            p.fit_textline(

                    "Shading with spot colors PANTONE 123 U, PANTONE 289 U, PANTONE Rubine Red U, PANTONE 1215 U:",

                    x, y -= 2 * leading, "fillcolor=black");

            y -= height + fontsize;


            /*

             * Create axial shading based on DeviceN color, using 100% of each

             * component distributed over the range 0%-100%

             */

            sh = p.shading("axial", x, y, x + width, y, 0, 0, 0, 0,

                    "stopcolors={  0%  {spotname {PANTONE 123 U} 1} "

                            + " 33%  {spotname {PANTONE 289 U} 1} "

                            + " 66%  {spotname {PANTONE Rubine Red U} 1} "

                            + "100%  {spotname {PANTONE 1215 U} 1} }");


            shp = p.shading_pattern(sh, "");

            p.set_graphics_option("fillcolor={pattern " + shp + "}");


            /* Fill a rectangle with the shading */

            p.rect(x, y, width, height);

            p.fill();


            p.end_page_ext("");


            p.end_document("");

        }

        catch (PDFlibException e) {

            System.err.print("PDFlib exception occurred:\n");

            System.err.print("[" + e.get_errnum() + "] " + e.get_apiname()

                    + ": " + e.get_errmsg() + "\n");

            exitcode = 1;

        }

        catch (Exception e) {

            System.err.println(e.getMessage());

            exitcode = 1;

        }

        finally {

            if (p != null) {

                p.delete();

            }

            System.exit(exitcode);

        }

    }

}