//========================================
//定义蛇体
function snake()
{
this.items = new Array();
}
function snake_eat(nt)
{
var s_length = this.items.length;
this.items[s_length] = nt;
}
function snake_move(dir)
{
this.destroy();
var y = this.items[0].y;
var x = this.items[0].x;
var nx = x + dir[1];
var ny = y + dir[0];
if (nx <0 || nx >= row || ny <0 || ny >= col || crossed(nx,ny))
{
end = true;
return;
}
caneat(nx,ny);
for (var i = this.items.length-1 ; i>=0 ; i --)
{
if (i != 0)
{
this.items.move(this.items[i-1].x,this.items[i-1].y);
}
else
{
this.items.move(nx,ny);
}
}
this.reload();
}
function caneat(nx,ny)
{
if (nx == nutad[0] && ny == nutad[1])
{
var lst = s.items[s.items.length-1];
var nd = new snakeNode(lst.x,lst.y);
s.eat(nd);
n.eated();
n.create();
}
}
//禁止穿越自身节点
function crossed( nx, ny )
{
for (var i = 0; i<s.items.length; i++)
{
if (s.items.x == nx && s.items.y == ny)
{
return true;
}
}
return false;
}
function snake_reload()
{
for (var i = 0 ; i<this.items.length ; i ++)
{
var curNode = this.items;
obj = document.all("Main" + curNode.x + "#" + curNode.y);
obj.style.background = Color[1];
}
}
function snake_destroy()
{
for (var i = 0 ; i<this.items.length ; i ++)
{
var curNode = this.items;
obj = document.all("Main" + curNode.x + "#" + curNode.y);
obj.style.background = Color[0];
}
}
function snake_clear()
{
this.destroy();
this.items = new Array();
}
//========================================
//程序界面
//初始化主控制区
function DrawArea(row,col,name){
var s = "<TABLE BORDER=1 cellspacing=0 cellpadding=1 bgcolor=" + Color[0] + ">";
for(var i=0; i<row; i++){
s = s + "<TR Height=" + size + ">";
for(var j=0; j<col; j++){
var id = name + i + "#" + j;
s = s + "<TD Width=" + size + " class=btnup id=" + id;
s = s + " style=\"background:" + Color[0] + "\"> </TD>"
}
s = s + "</TR>";
}
s = s + "</TABLE>";
return s;
}
//初始化
function Init(){
MainArea.innerHTML = DrawArea(row,col,'Main');
}
//==================================
//程序控制区，用来接收输入、定义控制方法
//控制输入
function keyDown(){
switch(event.keyCode)
{
case 37:
if (curr_direction[0] != -1)
{
move_direction[0] = -1;
move_direction[1] = 0;
}
break;
case 38:
if (curr_direction[1] != -1)
{
move_direction[0] = 0;
move_direction[1] = -1;
}
break;
case 39:
if (curr_direction[0] != 1)
{
move_direction[0] = 1;
move_direction[1] = 0;
}
break;
case 40:
if (curr_direction[1] != 1)
{
move_direction[0] = 0;
move_direction[1] = 1;
}
break;
}
}
function Begin()
{
end = false;
paused = false;
s.clear();
for (var i = 8; i >=0 ; i--)
{
sn = new snakeNode(0,i);
s.eat(sn);
}
n.eated();
n.create();
move_direction[0] = 1;
move_direction[1] = 0;
curr_direction[1] = s.items[1].x - s.items[0].x;
curr_direction[0] = s.items[1].y - s.items[0].y;
Start();
}
//启动开关
function Start()
{
if (end)
{
s.reload();
alert("挂了！");
return;
}
window.clearInterval(TimerID);
TimerID = window.setInterval("Run()",delay);
}
//运行主体
var d = true;
function Run(){
if(paused) return;
if(true){
window.clearInterval(TimerID);
s.move(move_direction);
curr_direction[1] = s.items[1].x - s.items[0].x;
curr_direction[0] = s.items[1].y - s.items[0].y;
Start();
}
}
//暂停开关
function Pause()
{
if (paused)
{
paused = false;
if (!end)
{
Run();
}
}
else
{
paused = true;
}
}