2017-04-04 01:58:52 +03:00
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<!DOCTYPE html>
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<html>
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<style>
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.snake.field {
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width: 500px;
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height: 500px;
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border: solid 1px silver;
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}
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</style>
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<script>
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var Snake = {
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config: {
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apple_color: 'red',
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2017-04-05 05:13:22 +03:00
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wall_color: 'gray',
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2017-04-04 01:58:52 +03:00
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interval: 200,
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},
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field_size: null,
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_field: null,
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_cells: null,
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2017-04-04 02:11:41 +03:00
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// XXX BUG: going down into bottom left corner breaks the snake...
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// ...check other corner cases!
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// ...looks like the only corner case...
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2017-04-04 01:58:52 +03:00
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_tick: function(){
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var that = this
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var l = this._cells.length
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var w = this.field_size.width
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var h = this.field_size.height
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var tick = this.__tick = (this.__tick + 1 || 0)
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var directions = 'neswn'
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this._cells.forEach(function(cell, i){
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var color = cell.style.backgroundColor
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// skip cells we touched...
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if(cell.tick == tick){
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return
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}
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// snake...
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if(cell.age != null){
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// handle cell age...
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if(cell.age == 0){
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delete cell.age
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cell.style.backgroundColor = ''
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} else {
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cell.age -= 1
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}
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// head...
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var direction = cell.direction
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var next =
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direction == 'n' ?
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(i < w ? l - w + i : i - w)
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: direction == 's' ?
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(i > (l-w) ? i - (l-w) : i + w)
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: direction == 'e' ?
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((i+1)%w == 0 ? i - (w-1) : i + 1)
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: direction == 'w' ?
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(i%w == 0 ? i + (w-1) : i - 1)
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: null
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if(next != null){
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next = that._cells[next]
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// turn...
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var turn = that.players[color] || ''
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if(turn != ''){
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var j = turn == 'left' ? directions.indexOf(direction) - 1
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: directions.indexOf(direction) + 1
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j = j < 0 ? 3 : j
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direction = directions[j]
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that.players[color] = ''
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}
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var age = cell.age
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2017-04-05 05:13:22 +03:00
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var move = false
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2017-04-04 01:58:52 +03:00
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// special case: other snake's head -- kill both...
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2017-04-05 05:13:22 +03:00
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if(next.direction){
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2017-04-04 01:58:52 +03:00
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next.style.backgroundColor = ''
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// NOTE: we are not deleteing .direction here as
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// we can have upto 4 snakes colliding...
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2017-04-04 02:11:41 +03:00
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next.direction = ''
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2017-04-04 01:58:52 +03:00
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delete next.age
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2017-04-05 05:13:22 +03:00
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// apples...
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} else if(next.style.backgroundColor == that.config.apple_color){
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age += 1
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move = true
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2017-04-04 01:58:52 +03:00
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// empty...
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// NOTE: anything but an apple will kill the snake...
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} else if(next.style.backgroundColor == ''){
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2017-04-05 05:13:22 +03:00
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move = true
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}
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if(move){
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2017-04-04 01:58:52 +03:00
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next.tick = tick
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next.style.backgroundColor = color
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next.age = age + 1
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next.direction = direction
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}
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delete cell.direction
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}
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}
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cell.tick = tick
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})
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},
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setup: function(field){
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field = field || this._field
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field = this._field = typeof(field) == typeof('str') ? document.querySelector(field)
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: field
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this._cells = [].slice.call(field.querySelectorAll('td'))
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this.field_size = {
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width: field.querySelector('tr').querySelectorAll('td').length,
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height: field.querySelectorAll('tr').length,
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}
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this.players = {}
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return this
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},
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2017-04-05 05:13:22 +03:00
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// constructors...
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2017-04-04 02:11:41 +03:00
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snake: function(color, x, y, direction, age){
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var head = this._cells[x + y * this.field_size.width]
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head.style.backgroundColor = color
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head.direction = direction
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head.age = (age || 5) - 1
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this.players[color] = ''
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return this
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},
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apple: function(x, y){
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this._cells[x + y * this.field_size.width]
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.style.backgroundColor = this.config.apple_color
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return this
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},
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wall: function(x, y, direction, length){
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length = length || 1
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while(length > 0){
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this._cells[x + y * this.field_size.width]
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.style.backgroundColor = this.config.wall_color
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x += direction == 'e' ? 1
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: direction == 'w' ? -1
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: 0
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x = x < 0 ? this.field_size.width + x
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: x % this.field_size.width
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y += direction == 'n' ? -1
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: direction == 's' ? 1
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: 0
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y = y < 0 ? this.field_size.height + y
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: y % this.field_size.height
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length -= 1
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}
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return this
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},
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// actions...
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start: function(){
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this.__timer = this.__timer
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|| setInterval(this._tick.bind(this), this.config.interval || 200)
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return this
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},
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stop: function(){
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clearInterval(this.__timer)
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delete this.__timer
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delete this.__tick
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return this
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},
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left: function(color){
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this.players[color || Object.keys(this.players)[0]] = 'left'
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return this
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},
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right: function(color){
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this.players[color || Object.keys(this.players)[0]] = 'right'
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return this
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},
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}
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2017-04-05 05:13:22 +03:00
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function test(){
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return Snake
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.setup('.snake')
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// XXX BUG: this will break as soon as it reaches the corner...
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.snake('blue', 0, 0, 's', 5)
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// hit an apple...
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.snake('green', 5, 3, 's', 5)
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.apple(5, 5)
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// hit a wall...
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.snake('silver', 14, 3, 'w', 5)
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.wall(2, 14, 's', 7)
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.start()
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}
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2017-04-04 01:58:52 +03:00
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</script>
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<body>
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2017-04-05 04:38:11 +03:00
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<table class="snake field" cellspacing="0">
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2017-04-04 01:58:52 +03:00
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<tr> <td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td>
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<td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td> </tr>
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<tr> <td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td>
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<td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td> </tr>
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<tr> <td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td>
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<td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td> </tr>
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<tr> <td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td>
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<td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td> </tr>
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<tr> <td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td>
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<td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td> </tr>
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<tr> <td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td>
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<td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td> </tr>
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<tr> <td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td>
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<td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td> </tr>
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<tr> <td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td>
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<td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td> </tr>
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<tr> <td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td>
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<td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td> </tr>
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<tr> <td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td>
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<td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td> </tr>
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<tr> <td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td>
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<td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td> </tr>
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<tr> <td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td>
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<td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td> </tr>
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<tr> <td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td>
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<td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td> </tr>
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<tr> <td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td>
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<td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td> </tr>
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<tr> <td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td>
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<td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td> </tr>
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<tr> <td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td>
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<td></td><td></td><td></td><td></td> <td></td><td></td><td></td><td></td> </tr>
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</table>
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</body>
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</html>
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<!-- vim:set ts=4 sw=4 : -->
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