Happy Holidays from CoffeeScript

This festive HTML5/CoffeeScript application brings holiday cheer to your browser! It creates an animated winter scene complete with falling snowflakes, blinking lights, and Jingle Bells music. While seemingly simple, it showcases powerful HTML5 and CoffeeScript techniques applicable to more complex projects.

This article guides you through the application's structure, compilation, and embedding within a webpage. The accompanying zip file includes the source code and a detailed PDF explaining the CoffeeScript code.

Note: This application has been tested on Chrome, Firefox, Internet Explorer 9 , Opera, and Safari desktop browsers.

Introducing HHFCS

Happy Holidays from CoffeeScript (HHFCS) uses the HTML5 Canvas API to render a nighttime winter forest scene. Falling snowflakes and twinkling wreaths animate the foreground, while a holiday message fades in to the tune of Jingle Bells (via the HTML5 Audio API). Figure 1 displays a snapshot of this charming scene.

The HHFCS application comprises several files organized within an HHFCS directory and its subdirectories for audio and images:

• HHFCS/audio/jb.mp3: Jingle Bells music (MP3 format, used by most browsers except Firefox and Opera).
• HHFCS/audio/jb.ogg: Jingle Bells music (Ogg format, for Firefox and Opera).
• HHFCS/HHFCS.coffee: Main application CoffeeScript code.
• HHFCS/HHFCS.html: HTML file for embedding the application.
• HHFCS/HHFCS.js: Compiled JavaScript equivalent of HHFCS.coffee.
• HHFCS/images/message.png: The holiday message image.
• HHFCS/images/scene.png: The winter forest scene image (modified public domain image).
• HHFCS/images/wreath0.png, HHFCS/images/wreath1.png, HHFCS/images/wreath2.png: Three frames for the animated wreath.
• HHFCS/Snowflake.coffee: CoffeeScript code for the Snowflake class.
• HHFCS/Snowflake.js: Compiled JavaScript equivalent of Snowflake.coffee.
• HHFCS/stripes.png: Candy cane pattern for the webpage background.
• HHFCS/title.png: Ice-patterned title image for the webpage.

Since browsers don't understand CoffeeScript, the .coffee files must be compiled to JavaScript using the CoffeeScript compiler (instructions available at coffeescript.org). Use these commands:

coffee --compile --bare HHFCS
coffee --compile --bare Snowflake

The --compile option creates corresponding JavaScript files, and --bare removes the function wrapper.

Embedding HHFCS in a Web Page

The provided HHFCS.html file embeds the application. (See Listing 1).

coffee --compile --bare HHFCS
coffee --compile --bare Snowflake

Listing 1: HHFCS.html file contents

The <meta> tag ensures correct character encoding across browsers. The JavaScript code initializes and draws the application with a specified delay.

Conclusion

Developing HHFCS in CoffeeScript proved significantly easier and faster than using JavaScript directly. While this is a basic CoffeeScript application, it demonstrates the language's capabilities. The accompanying PDF provides a detailed explanation of the application's functionality. Happy Holidays!

• [Link to Happy Holidays from CoffeeScript Source Code] (Replace with actual link)

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