PDFlib Cookbook

cookbook

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();
            }
        }
    }
}