在github上玩贪吃蛇
// ==UserScript==
// @name github snake
// @author wusuluren
// @description 在github上玩贪吃蛇
// @require http://cdn.bootcss.com/jquery/1.8.3/jquery.min.js
// @match *://github.com/*
// @supportURL https://github.com/Wusuluren
// @version 0.0.1
// @grant None
// @namespace https://greasyfork.org/users/194747
// ==/UserScript==
(function () {
'use strict';
class Position {
constructor(x, y) {
this.x = x
this.y = y
}
}
class SnakeNode extends Position {
constructor(x, y, prev, next) {
super(x, y)
this.prev = prev
this.next = next
}
}
const CLEAR_COLOR = 0
const SNAKE_COLOR = 2
const FOOD_COLOR = 4
var color_table = new Array()
var snake_head, snake_tail
var food
var Screen_Width, Screen_Height
var map
$(function(){
get_color_table()
full(0)
init()
var timer = setInterval(function() {
if (!move_snake()) {
clearInterval(timer)
full(0)
return
}
}, 1000)
})
function get_color_table () {
var lis = $('.legend').children()
for (var i = 0; i < lis.length; i++) {
color_table[i] = lis[i].style.backgroundColor
}
}
function draw_point(x, y, depth) {
var gs = document.getElementsByTagName('g')
if (x < gs.length) {
var days = gs[x].getElementsByClassName('day')
if (y < days.length) {
days[y].setAttribute('fill', color_table[depth])
}
}
}
function draw_position(pos, depth) {
var gs = document.getElementsByTagName('g')
if (pos.x < gs.length) {
var days = gs[pos.x].getElementsByClassName('day')
if (pos.y < days.length) {
days[pos.y].setAttribute('fill', color_table[depth])
}
}
}
function full (depth) {
var gs = document.getElementsByTagName('g')
if (gs === undefined)
return false
for (var x = 1; x < gs.length; x++) {
for (var y = 0; y < 7; y++)
draw_point(x, y, depth)
}
return true
}
function new_position() {
while(1) {
var x = Math.floor(Math.random() * Screen_Width)
var y = Math.floor(Math.random() * Screen_Height)
if (map[y][x] === undefined || map[y][x] == 0)
break
}
return new Position(x, y)
}
function same_position(a, b) {
return a.x == b.x && a.y == b.y
}
function init() {
var gs = document.getElementsByTagName('g')
Screen_Width = gs.length
Screen_Height = 7
map = new Array()
for (var y = 0; y < Screen_Height; y++) {
map[y] = new Array()
for (var x = 0; x < Screen_Width; x++)
map[y][x] = 0
}
var pos = new_position()
snake_head = new SnakeNode(pos.x, pos.y, undefined, undefined)
snake_tail = snake_head
draw_position(snake_head, SNAKE_COLOR)
map[pos.y][pos.x] = 1
food = new_position()
draw_position(food, FOOD_COLOR)
}
function in_screen(x, y) {
return (x >= 0 && x < Screen_Width) && (y >= 0 && y < Screen_Height)
}
function get_safe_x(x) {
if (x < 0)
return Screen_Width - 1
if (x >= Screen_Width)
return 0
return x
}
function get_safe_y(y) {
if (y < 0)
return Screen_Height - 1
if (y >= Screen_Height)
return 0
return y
}
function get_next_step() {
var gap_x = [0, -1, 0, 1]
var gap_y = [-1, 0, 1, 0]
var min_score = Infinity
var min_idx = 0
for (var i = 0; i < 4; i++) {
var x = get_safe_x(snake_head.x + gap_x[i])
var y = get_safe_y(snake_head.y + gap_y[i])
if (map[y][x] == 0) {
var score = Math.abs(food.x - x) + Math.abs(food.y - y)
if (score < min_score) {
min_score = score
min_idx = i
}
}
}
return new Position(get_safe_x(snake_head.x + gap_x[min_idx]), get_safe_y(snake_head.y + gap_y[min_idx]))
}
function move_snake() {
var next_step = get_next_step()
if (!judge_game(next_step)) {
return false
}
var new_head = new SnakeNode(next_step.x, next_step.y, undefined, snake_head)
snake_head.prev = new_head
snake_head = new_head
var discard_node = snake_tail
snake_tail = snake_tail.prev
snake_tail.next = undefined
map[snake_head.y][snake_head.x] = 1
map[discard_node.y][discard_node.x] = 0
draw_position(discard_node, CLEAR_COLOR)
draw_position(snake_head, SNAKE_COLOR)
return true
}
function judge_game(next_step) {
if (same_position(next_step, food)) {
var pos = new_position()
var node = new SnakeNode(pos.x, pos.y, snake_tail, undefined)
snake_tail.next = node
snake_tail = node
map[snake_tail.y][snake_tail.x] = 1
food = new_position()
draw_position(food, FOOD_COLOR)
return true
}
if (map[next_step.y][next_step.x] == 1) {
return false
}
return true
}
})();