var over = false, shapes = ("0,1,1,1,2,1,3,1;1,0,1,1,1,2,2,2;2,0,2,1,2,2,1,2;0,1,1,1,1,2,2,2;1,2,2,2,2,1,3,1;1,1,2,1,1,2,2,2;0,2,1,2,1,1,2,2")
.split(";");
function create(tag, css) {
var elm = document.createElement(tag);
elm.className = css;
document.getElementById("body").appendChild(elm);
return elm;
}
function Tetris(c, t, x, y) {
var c = c ? c : "c";
this.divs = [ create("div", c), create("div", c), create("div", c),
create("div", c) ];
this.reset = function() {
this.x = typeof x != 'undefined' ? x : 3;
this.y = typeof y != 'undefined' ? y : 0;
//shape有八个数字
this.shape = t ? t
: shapes[Math.floor(Math.random() * (shapes.length))]
.split(",");
this.show();
if (this.field
&& this.field.check(this.shape, this.x, this.y, 'v') == 'D') {
over = true;
this.field.fixShape(this.shape, this.x, this.y);
alert('game over');
}
}
this.show = function() {
for ( var i in this.divs) {
//alert(i);
//alert(this.x);
//alert(this.y);
this.divs[i].style.left = (this.shape[i * 2] * 1 + this.x) * 20 + 'px';
this.divs[i].style.top = (this.shape[i * 2 + 1] * 1 + this.y) * 20 + 'px';
}
}
this.field = null;
this.hMove = function(step) {
var r = this.field.check(this.shape, this.x - -step, this.y, 'h');
if (r != 'N' && r == 0) {
this.x -= -step;
this.show();
}
}
this.vMove = function() {
if (this.field.check(this.shape, this.x, this.y - -1, 'v') == 'N') {
this.y++;
this.show();
} else {
this.field.fixShape(this.shape, this.x, this.y);
this.field.findFull();
this.reset();
}
}
this.rotate = function() {
var s = this.shape;
var newShape = [ 3 - s[1], s[0], 3 - s[3], s[2], 3 - s[5], s[4],
3 - s[7], s[6] ];
var r = this.field.check(newShape, this.x, this.y, 'h');
if (r == 'D')
return;
if (r == 0) {
this.shape = newShape;
this.show();
} else if (this.field.check(newShape, this.x - r, this.y, 'h') == 0) {
this.x -= r;
this.shape = newShape;
this.show();
}
}
this.reset();
}
function Field(w, h) {
this.width = w ? w : 10;
this.height = h ? h : 20;
this.show = function() {
var f = create("div", "f")
f.style.width = this.width * 20 + 'px';
f.style.height = this.height * 20 + 'px';
}
this.findFull = function() {
for ( var l = 0; l < this.height; l++) {
var s = 0;
for ( var i = 0; i < this.width; i++) {
s += this[l * this.width + i] ? 1 : 0;
}
if (s == this.width) {
this.removeLine(l);
}
}
}
this.removeLine = function(line) {
for ( var i = 0; i < this.width; i++) {
document.body.removeChild(this[line * this.width + i]);
}
for ( var l = line; l > 0; l--) {
for ( var i = 0; i < this.width; i++) {
this[l * this.width - -i] = this[(l - 1) * this.width - -i];
if (this[l * this.width - -i])
this[l * this.width - -i].style.top = l * 20 + 'px';
}
}
}
this.check = function(shape, x, y, d) {
var r1 = 0, r2 = 'N';
for ( var i = 0; i < 8; i += 2) {
if (shape[i] - -x < 0 && shape[i] - -x < r1) {
r1 = shape[i] - -x;
} else if (shape[i] - -x >= this.width && shape[i] - -x > r1) {
r1 = shape[i] - -x;
}
if (shape[i + 1] - -y >= this.height
|| this[shape[i] - -x - -(shape[i + 1] - -y) * this.width]) {
r2 = 'D'
}
}
if (d == 'h' && r2 == 'N')
return r1 > 0 ? r1 - this.width - -1 : r1;
else
return r2;
}
this.fixShape = function(shape, x, y) {
var d = new Tetris("d", shape, x, y);
d.show();
for ( var i = 0; i < 8; i += 2) {
this[shape[i] - -x - -(shape[i + 1] - -y) * this.width] = d.divs[i / 2];
}
}
}
var f = new Field();
f.show();
var s = new Tetris();
s.field = f;
s.show();
window.setInterval("if(!over)s.vMove();", 1000);
document.onkeydown = function(e) {
if (over)
return;
var e = window.event ? window.event : e;
switch (e.keyCode) {
case 38: //up
s.rotate();
break;
case 40: //down
s.vMove();
break;
case 37: //left
s.hMove(-1);
break;
case 39: //right
s.hMove(1);
break;
}
}
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