graphics/fill_rules

 * 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 Lite/PDFlib/PDFlib+PDI/PPS 7

 * 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_parameter("SearchPath", searchpath);

        /* This means we must check return values of load_font() etc. */

        p.set_parameter("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: 1.5 $");

        /* For PDFlib Lite: change "unicode" to "winansi" */

        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.setfont(font, 14);

        p.show_xy("With the default \"nonzero winding number\" rule:", 20, 790);

        p.show_xy("Stroke a big and a small arc segment counterclockwise " +

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

        p.show_xy("With the default \"nonzero winding number\" rule:", 20, 400);

        p.show_xy("Stroke a big arc segment clockwise and", 20, 380);

        p.show_xy("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_parameter("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.setfont(font, 14);

        p.show_xy("With the \"evenodd\" fill rule: Draw a rectangle, a big " +

            "circle,", 20, 810);

        p.show_xy("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();

            }

        }

    }

}