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Programming Web Graphics with Perl & GNU Software
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● 內容簡介 ●
From access counters and log-report graphs to scientific plots and on-the-fly animated GIFs, graphics scripting is within the grasp of most Web authors. However, it is a poorly documented field. Programming Web Graphics with Perl & GNU Software shows intermediate and advanced Web designers how to use CGI scripts to generate dynamic graphic content and demystifies the manipulation of graphics formats for newcomers to the Web. 許多人以為 Web 頁面圖形只能以 Adobe PhotoShop 這一類的工具來設計。 透過 Perl 和 Gimp ( GNU Image Manipulation Program) ,你可以根據使用者的輸入在 Web 上產生動態的圖形,控制圖形顯示的內容,壓縮圖形格式,甚至提昇圖形的品質。 假設如果你要在頁面上顯示一個動態的股票行情表,即時的天候表,唯有利用這類的設計工具。雖然這些工具都是免費的,但很少有文件討論其中的技術。大多數的程式設計師根本不知道在網路上有這樣免費的工具存在。本書針對的就是高階CGI 的程式設計者。 本書採用了幾種特殊的 Perl 模組 ( GD,ImageMagick,PerlMagick,GIFgraph) 來產生圖形。此外也討論了 Gimp script 的設計,同時透過 Gimp 的 Script-Fu 與 Perl 的介面。主題包括: ● 如何利用資料庫中的資訊產生圖形。 ● 利用 Perl 的模組產生格式化的 PostScript 檔案。 ● 可重新使用的 Web counter 與 Web cam (更具可攜性 )。 ● 產生即時的動態 GIF。 ● Server 端圖形建立的最佳化。 本書同時提供了下列參考文件: ● 最常用的幾種 Web 圖形格式。 ● PNG,JPEG,與 giflib 函式庫。 ● Perl 圖形模組 GD 與 GIFgraph 的大量範例,以及 Perl 連接ImageMagick 的介面。 ● Gimp,Script-Fu;Perl 和 Gimp 之間的介面。
● 目錄 ●
Preface I. Introduction to Web Graphics 1. Image File Formats Network Graphics Basics Graphics Interchange Format (GIF) Portable Network Graphics (PNG) JPEG References 2. Serving Graphics on the Web The Server and CGI Web Graphics and the Browser Presenting Images in HTML Colors and the Web Browser The Once and Future Browser References 3. A Litany of Libraries Image Support Libraries References II. Graphics Programming Tools 4. On-the-Fly Graphics with GD GD Jumpstart Sample Application: A Chess Board Simulator The GD.pm Distribution Font Methods Polygon Methods 5. Industrial-Strength Graphics Scripting with PerlMagick Learn PerlMagick in 21 Seconds The ImageMagick Distribution and PerlMagick Image::Magick Attributes and Methods by Category Reading and Writing Images Getting and Setting Image::Magick Attributes Manipulating Images How to Tell When Something Has Gone Wrong Using the ImageMagick Utilities 6. Charts and Graphs with GIFgraph Let's Make Some Graphs! GIFgraph Reference Colors in GIFgraph Creating Data Sets with Data::Xtab Passing GIFgraph Graphs to GD Objects 7. Web Graphics with the Gimp Quick Gimp Getting and Installing the Gimp Using the Gimp for Day-to-Day Web Projects Scripting the Gimp in Perl References III. Dynamic Graphic Techniques 8. Image Maps Client-Side Versus Server-Side Image Map Tools Image Maps on the Fly: A Clickable "Wander" Engine 9. Moving Pictures: Programming GIF Animation Anatomy of a GIF89a Animation Seven Easy Pieces with PerlMagick GIFscript, an Animation Scripting Language 10. Web Graphics Cookbook The BrokenImage Module A Web Page Access Counter A JavaScript Rollover Menu A Web Cam ASCII ALTs Thumbnailing References 11. Paperless Office? Not in Our Lives: Printing and the Web Everything I Needed to Know About PostScript I Learned Here Using the PostScript Modules on the Web The PostScript::TextBlock Module Multipage Documents with PostScript::Document The PostScript::Elements Module References IV. Appendixes A. A Simple PNG Decoder in Perl B. Quick Reference Guide to the Gimp C. Procedure Reference for the Gimp
● 作者簡介 ●
Shawn P. Wallace Shawn Wallace has been applying computers to graphics problems for the past twelve years. A programmer and artist, Shawn is managing director of the AS220 (www.as220.org) artist community in Providence, RI., a cofounder of the SMT Computing Society, and a member of the Rhode Island chapter of the Perl Mongers. He is also involved in the Bolero open source music notation system (www.as220.org/shawn/bolero) and the Institute for Folk Computing, a program to inform and inspire the use of open software by the general public in Providence. Shawn studied computer engineering at the University of Rhode Island and participated in the construction of an early (mid-80s) hypermedia delivery system at HyperView Systems in Middletown, RI.
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