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Keywords multimedia electronic publication object concatenation group parallel group
1 Overview of Multimedia Electronic Publications Multimedia electronic publications are an emerging information medium, also known as CD-ROM TITLE. It integrates various media such as Text, Audio, Image, Movie, and Video with a computer program, and stores them on a CD-ROM in the form of electronic information, which is then passed through a multimedia computer. A publication of reading.
In essence, multimedia electronics and publications are application software products. They are controlled by computer programs and have comprehensive processing and editing of multimedia objects such as graphics, text, video and audio, and they are also associated with general software. The difference is mainly manifested in:
(1) Large amount of data processing CD-RRM TITLE contains a large amount of multimedia information, and the processing of data accounts for 70%--80% of the entire research and development process.
(2) Production process involves a wide range In the production process of CB-ROM TITLE, everything from content planning, artwork, audio, and software production to production and distribution requires creativity, planning, management, software design, video, and audio. The production and editing and computer art design and other technical personnel cooperate with each other and jointly complete.
(3) The need for more specialized equipment and application software In the production of CD-ROM TITLE, in addition to high-end multimedia computers, there is also a need for scanners that process pictures and text, and devices that handle audio and video information. It also requires the use of various multimedia production applications.
2 Multimedia Software Multimedia software can be divided into five layers in terms of its functionality:
Multimedia application software Multimedia authoring tool Multimedia data preparation software Multimedia operating system driver software
The high level is based on the lower level, so the development order is from the lower level to the higher level. The general driver software is related to a specific hardware; most of the operating systems are currently under the Windows operating system environment for multimedia expansion.
Multimedia data preparation software is software for collecting multimedia data, such as PhotoShopCoreIDraw for processing pictures, Director for processing animation, 3DMAX, SonudEdit for processing audio editing tools, COOLEdit pro, Premiere for processing images, and the like.
Multimedia editing authoring software, also known as multimedia authoring tool, is a system tool for multimedia professionals to develop multimedia application software on multimedia operating systems. Such software can be specialized software for multimedia integration, such as AuthorWare, Founder Author, can also be an object-oriented programming language, through the programming to achieve multimedia synthesis rendering. Such as VusalBasic, VusalC, Delphi and so on.
3 Basic components of multimedia electronic publications
3.1 The basic elements that make up a multimedia electronic publication The basic elements that make up a multimedia electronic publication are objects. The basis of any multimedia application software is a variety of media files. These media files are treated as objects during the development process, such as text objects, text objects, picture objects, graphic objects, primitive objects, animation objects, image objects, sound objects, and the like. In addition to specifying the selected media file attributes, these objects should also have the attributes of action behavior, access time attribute, dynamic effect attribute, and motion mode attribute. Only with these attributes can we effectively control the timing and location of each object in the system and control the link relationships among media.
In addition, you need to define some other special objects. For example, in a multimedia product, a button is often used to trigger the occurrence of an event, and a button object needs to be defined; in order to implement an object interface with other application software, an OLE object needs to be defined; on the pre-defined synchronization relationship of multiple objects, it needs to be defined. Group object. The group object can be divided into a concatenation group (controlling the entry and exit of multiple sub-objects), a parallel group (controlling the exit of multiple sub-objects at the same time), and a group (controlling the occurrence of multiple sub-objects in turn) according to the timing relationship of multiple objects.
3.2 "Spatiotemporal synthesis" of control objects
Multimedia application software is the synthesis and reproduction of multimedia objects. Its synthesis mainly includes space synthesis and time synthesis. Spatial synthesis refers to the description of spatial characteristics and positional relationships between a series of media objects coexisting in the same spatial domain; time synthesis is a series of media objects that are represented concurrently (including sequential and parallel) in a certain time domain. Description of timing relationships. During the design period, space synthesis is usually incorporated into time synthesis, and time synthesis is the main line. The basic logic unit that controls this space-time synthesis is the page. A multimedia product generally consists of a cover page, a home page, a number of sequence pages, and a number of topic pages.
3.3 Link between pages of hierarchical structure Multimedia application software often uses a hierarchical structure to plan and manage the relationship between pages and pages. Each part is arranged in an orderly manner and organically combined to form a diversified and interactive electronic reading.
4 Steps and examples of multimedia electronic publication development
4.1 Development of multimedia publications The development of multimedia electronic publications is generally divided into five phases:
System design phase. Determine the topic outline, write a script, complete the detailed flowchart design.
Structural design phase. Planning system function modules, edit the hierarchical structure of publication system information.
·Programming stage. Integrate the contents of each media object and edit page.
System test phase. Test the system based on different hardware and software platforms. Through testing to verify whether it achieves its intended purpose, discover hidden defects, and make necessary adjustments and corrections to the system until it is satisfied.
· Form product stage. Generate an executable file, package the resource file, and dial.
Just like other software, the system design phase is the most important part of the entire development process. At this stage, special attention must also be paid to: due to the limited storage capacity of a single optical disc, the content capacity of a multimedia publication and the compression ratio and reduction effect of objects such as pictures, sounds, and images. Both must be considered together, and one side must not be neglected.
4.2 Development and Production of Multimedia Publications The "China Public Security Border (Guangdong Volume)" electronic version was developed using Aathorware's multimedia integration tools and assistant tools such as PhotoShop and Premiere. The electronic version is based on the “Public Border Defense in China (Guangdong Vol.)†and incorporates the image and imagery of the border defense in Guangdong in recent years. It uses a multimedia approach to present, geographically, intuitively and vividly the geography, economy, and transportation of the border areas of Guangdong. The history of the development of public security border defense forces, the responsibilities and related situations, and the general situation of the border areas of Hong Kong and Macao.
Technical realization of several specific problems in development and design. We use the main menu search as the main display method, and use the following methods to handle text display, hot zone display, sound, and video playback.
(1) Text display Text selection uses a dark background, a moderate font size, and a truncation of the number of texts per page to reproduce the textual content of the book “China Public Security Border Defense (Guangdong Volume)â€. For a multi-screen text display page, the “wrap to start position†should be set in the attributes of the text object of the page, so that when the reader enters the text page, it starts reading from the first screen of the text.
When the text can not be displayed on one screen, the next screen can be displayed by turning pages. In the design, you should set two icon buttons for page forward and page backward, and click to implement page turning action. When the text is flipped to the final page, the implementation of the backward page button disappears can be designed as follows:
· In the subject page entry, define the variable tm (used to record the current display page number);
· In the i-th text display page attribute to the variable tm assignment: tm = i-1;
· Turn each page backward, tm = tm + 1; page forward every time, tm = tm-1;
· When tm=maximum page number, page backwards exit; when tm=0 (first page), page forward icon exits.
(2) Display Hot Zones Multimedia products commonly use different color rectangular objects to distinguish between different hot zones. These changes occur after the mouse cursor has moved into the hot zone. In the same page, if there are more small-scale hot zones, in order to grasp the accuracy of the mouse positioning, a certain hot zone and display should be determined in the design. For example, there are a hot zone object 1, a rectangular object 1, a hot zone object 2, a rectangular object 2, ..., a hot zone object n, and a rectangular object n. Hot zone object 1 action sequence:
Hot zone object 1
Make the rectangle object 1 enter;
Make the rectangle object 2 exit;
......
Make the rectangle object n exit.
(3) Making flashing icons In multimedia books, it is often necessary to set a small flashing icon at a certain position to achieve this flashing effect:
· Prepare multiple graphic objects or picture objects of the same icon in different colors;
· Create different color objects into a selection group;
• Set Select Group Properties: Allows child objects to be reentrant; sets child object duration. (Continuously asked in ms, generally set in 200 ~ 500ms).
(4) The design of the electronic version of “help†takes into account that the readers of the electronic version have different degrees of proficiency in the computer. In the “help†part of the electronic version, two forms are designed: text description and animation demonstration. To provide readers with real-time online help, friendly interface, clear and thorough instructions, so that readers no longer need help from the instructions.
(5) Design ideas for animation presentations · Select a representative number of topic pages In Help, select the home page, a typical text page, and a typical map hot zone page. The main menu is first displayed on the homepage, and the main menu can be used to index each chapter directory, and each main menu is clicked to enter the submenu. The submenu is the reorganized chapter contents. Click any of these sub-menu items, the system will show the content of a certain aspect of Guangdong border defense with multimedia means such as graph, text, video and audio. The text display page includes pictures, text exchange, multi-screen text display, text voice control, page forward and backward control. The map page includes the display of multiple hot zone icons, button control text, reports, and other objects. Select these three typical topic pages, through the animation demonstration, can basically explain the entire electronic version of the use of reading.
Create parallel groups with the basic elements of each topic page. In order to automate the entire presentation process, use the parallel group to store the main objects of each topic page. In this way, you can guarantee a theme page for the animation presentation control of the topic page. The self-enclosed nature of the demonstration operation can also ensure the dynamic conversion of the link between the topic pages. Here takes the homepage as an example. Assume that the parallel group of the homepage is called the parallel group 111. There are picture sub-objects "submenu 1,..., submenu 6", etc. There is a rectangular sub-object "Main Menu Mask 1,..., Main Menu". Cover 6","Submenu item 21,... Submenu item 25" and so on.
• Design animations to simulate the use of electronic versions of reading.
In a topic page, use a concatenation group to implement a set of animation actions for the mouse cursor. At design time
a. First, define the object according to different mouse cursor icon requirements at different times of the system. For example, define “picture 1†as the “arrow†cursor when the mouse moves, and define “picture 2†as the mouse enters the hot zone. "Curses etc. Then define the initial position for each picture object, set the object's behavior attribute and the object's motion mode attribute. For example, set the exercise mode: automatically start at the fixed end point and the object enters, and the exercise time is 1--2s.
b. Create a selection group for simulating the actions when the mouse is clicked, and set a pending text object near the mouse cursor to illustrate what results will appear when you click the mouse here. The selection group consists of several picture objects and rectangular button objects. Set the dynamic effect of the picture object
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