/* $Id: color_gradient.java,v 1.10 2007/10/30 16:16:35 katja Exp $
 * Color gradient:
 * Fill some area or text with a smooth transition from one color to another

 * Required software: PDFlib Lite/PDFlib/PDFlib+PDI/PPS 7
 * Required data: none
 */
package com.pdflib.cookbook.pdflib.color;

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

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

    pdflib p = null;
    int font, sh, pattern;

    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: 1.10 $");

        /* Start Page */
        p.begin_page_ext(595, 842, "");

        /* Fill the page completely with a gradient from green to black:
         * Set the first color for the gradient to green
         */
        p.setcolor("fillstroke", "rgb", 0.0, 0.5, 0.5, 0.0);

        /* Set the second color for the gradient to black;
         * define an axial gradient with a size similar to the the page size
         */
        sh = p.shading("axial",  0, 0, 595, 842, 0.0, 0.0, 0.0, 0.0, "");

        /* Draw the gradient */
        p.shfill(sh);

        /* Fill a rectangle with a gradient:
         * Save the current graphics state
         */
        p.save();

        /* Set the first color for the gradient to orange */
        p.setcolor("fill", "rgb", 1.0, 0.5, 0.1, 0.0);

        /* Set the second color for the gradient to a light orange;
         * define an axial gradient with a size similar to the size
         * of the rectangle to be filled
         */
        sh = p.shading("axial",  200, 200, 450, 450, 0.9, 0.8, 0.8, 0.0, "");

        /* Draw a rectangle and set the clipping path to
         * the shape of the rectangle
         */
        p.rect(200, 200, 250, 250);
        p.clip();

        /* Fill the clipping path with the gradient */
        p.shfill(sh);

        /* Restore the current graphics state to reset the clipping path */
        p.restore();

        /* Fill a circle with a gradient:
         * Save the current graphics state
         */
        p.save();

        /* Set the first color for the gradient to white */
        p.setcolor("fill", "rgb", 1.0, 1.0, 1.0, 0.0);

        /* Set the second color for the gradient to orange;
         * define a radial gradient with a size similar to the size
         * of the circle to be filled
         */
        sh = p.shading("radial", 400, 600, 400, 600, 1.0, 0.5, 0.1, 0.0,
            "r0 0 r1 60");

        /* Draw a circle and set the clipping path to
         * the shape of the circle
         */
        p.circle(400, 600, 50);
        p.clip();

        /* Fill the clipping path with the gradient */
        p.shfill(sh);

        /* Restore the current graphics state to reset the clipping path */
        p.restore();

        /* Fill a text with a gradient:
         * Load the font; for PDFlib Lite: change "unicode" to "winansi"
         */
        font = p.load_font("Helvetica-Bold", "unicode", "");

        if (font == -1)
        throw new Exception("Error: " + p.get_errmsg());

        p.setfont(font, 36);

        /* Set the first color for the gradient to white */
        p.setcolor("fill", "rgb", 1, 1, 1, 0);

        /* Set the second color for the gradient to orange; define an axial
         * gradient with a size similar to the size of the text to be filled
         */
        sh = p.shading("axial", 50, 50, 50, 200, 1.0, 0.5, 0.1, 0.0, "");

        /* Create a shading pattern from the shading and set the
         * pattern as the current fill color
         */
        pattern = p.shading_pattern(sh, "");
        p.setcolor("fill", "pattern", pattern, 0, 0, 0);

        /* Output the text with the gradient as current fill color */
        p.show_xy("Hello World!", 50, 100);
        p.continue_text("(says PDFlib GmbH)");

        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();
            }
        }
    }
}