PDFlib

高度なPDFアプリケーションの開発を支援する定番プログラムライブラリー Supported by インフォテック株式会社

PDFlib サンプル集(クックブック)

本サンプルプログラムは、PDF 文書生成ライブラリーの実装である PDFlib の基本的な機能を実際のプログラムで紹介したものです。

本サイトでダウンロードした PDFlib は、一部機能の制限を除き、評価版として無償でお使いいただけます。

部分的なイメージの表示

PDFlib で、部分的にイメージを表示するサンプルプログラムです。matchbox オプションの clipping サブオプションを使用して、イメージの一部の矩形を定義します。一部のイメージをオリジナルのサイズで出力します。また、サイズは与えられたボックスにフィットするように出力されます。

 
/*
 * Display image partially:
 * Display an image partially.
 *
 * Use the "matchbox" option with the "clipping" suboption to define a
 * rectangular part of the image.
 * Output the image part in its original size.
 * Output the image part by fitting it in a box of a given size.
 *
 * Required software: PDFlib/PDFlib+PDI/PPS 9
 * Required data: image file
 */
package com.pdflib.cookbook.pdflib.images;

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

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

        pdflib p = null;
        int exitcode = 0;
        String imagefile = "nesrin.jpg";
        int image, gstate, font;
        String optlist, text;
        int llx = 50, lly = 550;
        
        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);

            /* Load the image */
            image = p.load_image("auto", imagefile, "");
            if (image == -1)
                throw new Exception("Error: " + p.get_errmsg());
            
            font = p.load_font("Helvetica", "unicode", "");
            if (font == -1)
                throw new Exception("Error: " + p.get_errmsg());
            
            /* Start page 1 */
            p.begin_page_ext(0, 0, "width=a4.height height=a4.width");
            
            p.setfont(font, 12);
            
       
            /* -------------------------------------------------------------
             * Output the complete image in its original size with a certain
             * transparency as a kind of background image
             * -------------------------------------------------------------
             */
            
            /* Output some descriptive text */
            text = "Page 1:";
            p.fit_textline(text, llx, lly, "");
            text = "Place the full image in its original size, with a " +
                   "transparency of 50%";
            p.fit_textline(text, llx, lly-=30, "");
            
            /* Save the current graphics state */
            p.save();
            
            /* Create an extended graphics state with a transparency set to 50% */
            gstate = p.create_gstate("opacityfill=.4");
            
            /* Apply the extended graphics state */
            p.set_gstate(gstate);
            
            /* Fit the image in its original size with the transparency set above */
            p.fit_image(image, llx, lly-=500, "");
            
            /* Restore the original graphics state */
            p.restore();
            
            
            /* ----------------------------------------------
             * Place a part of the image in its original size
             * ----------------------------------------------
             */
            
            /* Define a rectangular part of the image by using the "matchbox" option
             * with the "clipping" suboption to set the lower left and upper right
             * corners of the rectangle.
             */
            int c_llx = 350, c_lly = 180, c_urx = 550, c_ury = 360;
            
            optlist = "matchbox={clipping={" + 
                c_llx + " " + c_lly + " " + c_urx + " " + c_ury + "}}";
            
            /* Output some descriptive text */
            text = "Place a part of the image in its original size at the";
            p.fit_textline(text, llx + c_llx, 410, "");
            
            text = "position as it would appear in the full image";
            p.fit_textline(text, llx + c_llx, 395, "");
                      
            /* Display the image partially at the same position as it would appear
             * when displaying the complete image above.
             */
            p.fit_image(image, llx + c_llx, lly + c_lly, optlist);
            
            /* Output some descriptive text */
            text = "Place a part of the image in its original size";
            p.fit_textline(text, llx, 230, "");
            
            text = "at the lower left corner of the full image";
            p.fit_textline(text, llx, 215, "");
            
            /* Now, display the part of the image at the lower left corner of the
             * complete image above.
             */
            p.fit_image(image, llx, lly, optlist);
            
            p.end_page_ext("");
                  
            /* Start Page 2 */
            p.begin_page_ext(0, 0, "width=a4.height height=a4.width");
            
            p.setfont(font, 12);
            
                  
            /* ----------------------------------------------------
             * Display the image partially in a box of a given size
             * ----------------------------------------------------
             */
            lly = 550;
            /* Output some descriptive text */
            p.fit_textline("Page 2:", llx, lly, "");
            
            text = "Output a part of the image in its original size:";
            p.fit_textline(text, llx, lly-=30, "");
            
            text = "p.fit_image(image, x, y, \"matchbox={clipping={35% 35% 75% " +
                   "75%}}\");";
            p.fit_textline(text, llx, lly-=15, "");
                         
            /* Define a rectangular part of the image by using the "matchbox" option
             * with the "clipping" suboption. The lower left and upper right corners
             * of the rectangle are set as percentages of the original image size. 
             */
            optlist = "matchbox={clipping={35% 35% 75% 75%}}";
            
            /* Place the part of the image defined */
            p.fit_image(image, llx, lly-=220, optlist);
            
            /* Output some descriptive text */
            text = "Place a part of the image in a given box:";
            p.fit_textline(text, llx, lly-=50, "");
            
            text = "p.fit_image(image, x, y, \"matchbox={clipping={35% 35% 75% " +
                   "75%}} boxsize={300 200} fitmethod=meet showborder\");";
            p.fit_textline(text, llx, lly-=15, "");
            
            /* Display the image partially in a box of the given size. Scale the
             * part of the image proportionally until it fits completely into the
             * box.
             */
            optlist = "matchbox={clipping={35% 35% 75% 75%}} " +
                "boxsize={200 100} fitmethod=meet showborder";
            
            p.fit_image(image, llx, lly-=120, optlist);
            
            p.end_page_ext("");
            
            p.close_image(image);

            p.end_document("");

        } catch (PDFlibException e) {
            System.err.println("PDFlib exception occurred:");
            System.err.println("[" + e.get_errnum() + "] " + e.get_apiname() +
                                ": " + e.get_errmsg());
            exitcode = 1;
        } catch (Exception e) {
            System.err.println(e);
            exitcode = 1;
        } finally {
            if (p != null) {
                p.delete();
            }
            System.exit(exitcode);
        }
    }
}
(Apr 3, 2007 - May 23, 2019)