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cleanup + docs...

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Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>
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Alex A. Naanou 2017-04-13 14:38:34 +03:00
parent 1d56dfbb1c
commit 0e5fcb9cff
1 changed files with 24 additions and 7 deletions
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31
simplesnake/simplesnake.js
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@ -4,7 +4,7 @@
* *
* This code is designed to illustrate the non-intuitive approach to an * This code is designed to illustrate the non-intuitive approach to an
* implementation, building a snake game as a cellular automaton rather * implementation, building a snake game as a cellular automaton rather
* than the more intuitive, a set of entities (OOP) or a number of sets * than the more obvious, set of entities (OOP) or a number of sets
* of procedures and data structures, directly emulating the "tactile" * of procedures and data structures, directly emulating the "tactile"
* perception of the game, i.e. independent field, snakes, walls, apples * perception of the game, i.e. independent field, snakes, walls, apples
* and their interactions. * and their interactions.
@ -27,6 +27,23 @@
* clarity... * clarity...
* *
* *
* This code is structured in a scalable and introspective way:
* - Snake object is reusable as a prototype enabling multiple games
* to run at the same time
* - Snake implements an open external control scheme, i.e. it does not
* impose a specific way to implementing the way to control the game
* - Simple (but not trivial) code and code structure
* - Introspective: no hidden/masked state or functionality
* - No external dependencies
*
*
* Goals:
* - Show that the "intuitive" is not the only approach
* - Show that the "intuitive" is not allways the simplest
* - Show one approach to a scalable yet simple architecture
*
*
*
**********************************************************************/ **********************************************************************/
function makeEvent(handler_attr){ function makeEvent(handler_attr){
@ -104,7 +121,7 @@ var Snake = {
}).join('\n') }).join('\n')
}\n</table>` }\n</table>`
}, },
_step: function(){ _tick: function(){
var that = this var that = this
var l = this._cells.length var l = this._cells.length
var w = this.field_size.width var w = this.field_size.width
@ -115,7 +132,7 @@ var Snake = {
this._cells.forEach(function(cell, i){ this._cells.forEach(function(cell, i){
var color = cell.style.backgroundColor var color = cell.style.backgroundColor
// skip cells we touched... // skip cells we touched on this tick...
if(cell.tick == tick){ if(cell.tick == tick){
return return
} }
@ -131,7 +148,7 @@ var Snake = {
cell.age -= 1 cell.age -= 1
} }
// head... // snake head -> move...
var direction = cell.direction var direction = cell.direction
if(directions.indexOf(direction) >= 0){ if(directions.indexOf(direction) >= 0){
// turn... // turn...
@ -144,7 +161,7 @@ var Snake = {
that.players[color] = '' that.players[color] = ''
} }
// next cell index... // get next cell index...
var next = var next =
direction == 'n' ? direction == 'n' ?
(i < w ? l - w + i : i - w) (i < w ? l - w + i : i - w)
@ -169,7 +186,7 @@ var Snake = {
that.snakeKilled(other) that.snakeKilled(other)
that.snakeKilled(color) that.snakeKilled(color)
// apple -> grow age... // apple -> increment age...
} else if(next.style.backgroundColor == that.config.apple_color){ } else if(next.style.backgroundColor == that.config.apple_color){
age += 1 age += 1
move = true move = true
@ -269,7 +286,7 @@ var Snake = {
}, },
start: function(t){ start: function(t){
this.__timer = this.__timer this.__timer = this.__timer
|| setInterval(this._step.bind(this), t || this.config.interval || 200) || setInterval(this._tick.bind(this), t || this.config.interval || 200)
return this return this
}, },
stop: function(){ stop: function(){