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graphics/fill_rules

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/* $Id: fill_rules.java,v 1.9 2013/02/20 10:35:46 stm Exp $

 * Fill Rules:

 * Define some overlapping vector graphics and fill them using

 * various methods

 *

 * Use the default "nonzero winding number" rule to fill overlapping objects and

 * create a ring, for example.

 * Use the "evenodd" fill rule to make overlapping objects being

 * filled alternately.

 *

 * Required software: PDFlib/PDFlib+PDI/PPS 9

 * Required data: none

 */

package com.pdflib.cookbook.pdflib.graphics;


import com.pdflib.pdflib;

import com.pdflib.PDFlibException;


public class fill_rules {

    public static void main(String argv[]) {

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

        String searchpath = "../input";

        String outfile = "fill_rules.pdf";

        String title = "Fill Rules";


        pdflib p = null;

        int font;


        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 + " $Revision: 1.9 $");


            font = p.load_font("Helvetica", "unicode", "");

            if (font == -1)

                throw new Exception("Error: " + p.get_errmsg());


            /*

             * --------------------------------------------------------------

             * Case I: The default "nonzero winding number" rule will be

             * used. All defined objects will be filled with one p.fill() call.

             * In this case (without any coordinate transformation being

             * performed), overlapping objects which are drawn counterclockwise

             * will be filled with the current fill color while all objects

             * drawn in clockwise direction won't be filled. Note that

             * p.circle() and p.rect() functions define objects which will be

             * drawn counterclockwise.

             * --------------------------------------------------------------

             */


            /* Start Page 1 */

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


            /* Set the color to purple */

            p.setcolor("fill", "rgb", 1.0, 0.0, 0.5, 0.0);


            /*

             * Define a big arc segment of 360 degrees in counterclockwise

             * direction. Move to the starting point of the arc segment first

             */

            p.moveto(450, 600);

            p.arc(300, 600, 150, 0, 360);


            /*

             * Define a small arc segment of 360 degrees in counterclockwise

             * direction. Move to the starting point of the arc segment first

             */

            p.moveto(400, 600);

            p.arc(300, 600, 100, 0, 360);


            /*

             * Define a big arc segment of 360 degrees in clockwise direction.

             * Move to the starting point of the arc segment first

             */

            p.moveto(450, 200);

            p.arcn(300, 200, 150, 360, 0);


            /*

             * Define a small arc segment of 360 degrees in counterclockwise

             * direction. Move to the starting point of the arc segment first

             */

            p.moveto(400, 200);

            p.arc(300, 200, 100, 0, 360);


            p.fill_stroke();


            /* Set the color to black */

            p.setcolor("fill", "gray", 0, 0.0, 0, 0.0);


            p.set_text_option("font=" + font + " fontsize=14");


            p.fit_textline("With the default \"nonzero winding number\" rule:",

                20, 790, "");

            p.fit_textline(

                "Stroke a big and a small arc segment counterclockwise "

                    + "and fill them with purple", 20, 770, "");


            p.fit_textline("With the default \"nonzero winding number\" rule:",

                20, 400, "");

            p.fit_textline("Stroke a big arc segment clockwise and", 20, 380,

                "");

            p.fit_textline(

                "a small arc segment counterclockwise and fill them with " +

                "purple", 20, 360, "");


            p.end_page_ext("");


            /*

             * -----------------------------------------------------------------

             * Case II: The fill rule of "evenodd" will be used. All defined

             * objects will be filled with one p.fill() call. In this case,

             * overlapping objects will be drawn according to the "evenodd" rule

             * and filled alternately.

             * -----------------------------------------------------------------

             */


            /* Start Page 2 */

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


            p.set_graphics_option("fillrule=evenodd");


            /* Set the color to purple */

            p.setcolor("fill", "rgb", 1.0, 0.0, 0.5, 0.0);


            /* Define a rectangle */

            p.rect(100, 100, 400, 300);


            /* Define a big circle */

            p.circle(300, 500, 200);


            /* Define an arc segment */

            p.moveto(300, 750);

            p.lineto(300, 500);

            p.arc(300, 500, 250, 0, 90);


            /* Define a small circle */

            p.circle(300, 600, 50);


            p.fill_stroke();


            /* Set the color to black */

            p.setcolor("fill", "gray", 0, 0.0, 0, 0.0);


            p.set_text_option("font=" + font + " fontsize=14");


            p.fit_textline(

                "With the \"evenodd\" fill rule: Draw a rectangle, a big " +

                "circle,", 20, 810, "");

            p.fit_textline(

                "an arc segment, and a small circle and fill them with purple",

                20, 790, "");


            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");

        }

        catch (Exception e) {

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

        }

        finally {

            if (p != null) {

                p.delete();

            }

        }

    }

}