![]() So at 60 frames per second we can check for a collision against a snake over 100 times in each and Test (firefox), on a fairly underpowered laptop, it could scan the entire 4096 segment queue over 8000 times a found a match late at the end of the linear scanĪnd even in the worse case, when the match is made late (or not at all), in the worse performing browser for this. ![]() found a match in the middle of the linear scan.That performs simple x/y coordinate checks on a (worse-case) 4096 segment snake. To verify the performance of a linear pass though a queue, I created a test case Of a modern browser, but neither should a linear walk through a queue of only a few hundred items.Īll things being equal, I would prefer to choose the simpler queue implementation. A 4096 item array should not trouble the memory consumption In reality, for a game played on a 64圆4 grid, with a total of 4096 cells, neither of theseĪpproaches really causes a problem. Performance implementations since we have to do a linear O(n) walk through the queue to perform Implementation uses less memory and leads to simpler and more flexible code, but might have Lead to slightly messier code but has constant O(1) time collision detection. The 2 dimensional array might take up more memory and Trivial to pop off the tail of the snake and push on a new head. Segments (x,y coordinates) and a single direction for the snake’s head. I found that the code came out a lot cleaner if I maintained a simple queue of snake I found this approach to be a little messy, particularly around maintaining the correct directionįor the tail, having to update the old and the new head positions, and for dealing with multi-playerĬollision detection if only a single object can live in each cell at any one time. Some prefer to useĪ large 2 dimensional array for the grid and maintain the position (and direction) for the head There are a couple of approaches for the data structure for a snakes game. to start, arrow keys to change direction Data Structure Sorry, this example cannot be run because your browser does not support the element It’s keyboardĬontrolled so hit to start the game and use the arrow keys to move the snake around. How to build the simple, raw unpolished, snakes mechanics using javascript and the HTML5īefore I get started, here is the raw game itself in its simplest form. I thought I would take some time out to show So, before I dive into ‘finishing’ the game. The effort to build the raw game mechanics. In fact the effort to provide the polish far outweighs It will probably take a fair amount of time and effort to provide all this polishing, even a decent AI controlled enemy snake (for player vs computer match ups).a particle system for effects when you eat food, or crash into a wall.a nice rendering technique for the snake, food and walls.This time around I want to focus on the polish that will make the game feel ‘finished’, Implementing the raw mechanics of this is quite easy (see below the fold for details), so The underlying mechanics of a snakes game is very simple, wander around a twoĭimensional grid, eating food to grow larger, avoid colliding with obstacles, Earlier in the year I started experimenting with very simple HTML5 games
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