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。


/* $Id: display_image_partially.java,v 1.5 2013/01/15 10:11:59 stm Exp $
 * 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
 */
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;
    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 + " $Revision: 1.5 $");

        /* 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.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();
            }
        }
    }
}
(Apr 3, 2007 - Feb 20, 2014)