Gaming: Battle on the High Seas, Part 1

This article introduces SeaBattle, a simple HTML5 game, demonstrating its embedding in a webpage and outlining its architecture. SeaBattle, playable in Chrome, Firefox, Internet Explorer 9, Opera 12, and Safari 5, features a destroyer battling submarines using depth charges and torpedoes. The game continues until either combatant is destroyed, resetting the score upon restart.

Figure 1: SeaBattle's title screen prompts the player to start with the Return key.

The gameplay (Figure 2) shows the destroyer against a starry backdrop, displaying the current and high scores (from local storage). The destroyer's lives are indicated by images. Players use arrow keys to maneuver, evading torpedoes, and the spacebar to fire depth charges. Hitting a submarine scores 100 points, updating the high score if surpassed. The game ends when either the destroyer or submarine is destroyed, displaying a win/lose message.

Figure 2: Destroyer versus submarine; depth charge and torpedo sizes are exaggerated for clarity.

Embedding SeaBattle:

SeaBattle uses SeaBattle.js, jQuery, and the jQuery HotKeys plugin (detailed in Part 2). Listing 1 shows their inclusion in a webpage. Listing 2 demonstrates initialization and the game loop, using requestAnimationFrame for smooth animation (or setInterval for browsers lacking support). The init() function sets up the canvas, loads resources, etc., while update() handles game logic and draw() redraws the canvas.

SeaBattle's JavaScript Architecture:

The SeaBattle object (Listing 3) features an API with init(), update(), and draw(). Internal pseudo-constants manage game states (INIT, TITLE, PLAY, WINLOSE, RESTART) and limits (MAX_DC, MAX_TORP). Functions handle resource loading (allResourcesLoaded()), collision detection (intersects()), object creation (makeDepthCharge, makeExplosion, makeShip, makeSub, makeTorpedo), random number generation (rnd()), and HTML5 storage check (supports_html5_storage()).

Conclusion:

SeaBattle showcases HTML5 game development using Audio, Canvas, and Web Storage APIs. Future parts will delve deeper into its functionality.

Frequently Asked Questions about HTML5 Games and WordPress Integration (This section is added based on the original input):

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