function rotate(){
// 定义记录能否旋转的旗标
var canRotate = true;
for (var i = 0 ; i < currentFall.length ; i++)
{
var preX = currentFall[i].x;
var preY = currentFall[i].y;
// 始终以第三个方块作为旋转的中心,
// i == 2时，说明是旋转的中心
if(i != 2)
{
// 计算方块旋转后的x、y坐标
var afterRotateX = currentFall[2].x + preY - currentFall[2].y;
var afterRotateY = currentFall[2].y + currentFall[2].x - preX;
// 如果旋转后所在位置已有方块，表明不能旋转
if(tetris_status[afterRotateY][afterRotateX + 1] != NO_BLOCK)
{
canRotate = false;
break;
}
// 如果旋转后的坐标已经超出了最左边边界
if(afterRotateX < 0 || tetris_status[afterRotateY - 1][afterRotateX] != NO_BLOCK)
{
moveRight();
afterRotateX = currentFall[2].x + preY - currentFall[2].y;
afterRotateY = currentFall[2].y + currentFall[2].x - preX;
break;
}
if(afterRotateX < 0 || tetris_status[afterRotateY-1][afterRotateX] != NO_BLOCK)
{
moveRight();
break;
}
// 如果旋转后的坐标已经超出了最右边边界
if(afterRotateX >= TETRIS_COLS - 1 ||
tetris_status[afterRotateY][afterRotateX+1] != NO_BLOCK)
{
moveLeft();
afterRotateX = currentFall[2].x + preY - currentFall[2].y;
afterRotateY = currentFall[2].y + currentFall[2].x - preX;
break;
}
if(afterRotateX >= TETRIS_COLS - 1 ||
tetris_status[afterRotateY][afterRotateX+1] != NO_BLOCK)
{
moveLeft();
break;
}
}
}
if(canRotate){
for (var i = 0 ; i < currentFall.length ; i++){
var preX = currentFall[i].x;
var preY = currentFall[i].y;
if(i != 2){
currentFall[i].x = currentFall[2].x +
preY - currentFall[2].y;
currentFall[i].y = currentFall[2].y +
currentFall[2].x - preX;
}
}
localStorage.setItem("currentFall", JSON.stringify(currentFall));
}
}
旋转
//按下 下 或 interval到了
function next(){
if(moveDown()){
//记录block
for(let i=0;i<currentFall.length;i++)
tetris_status[currentFall[i].y][currentFall[i].x]=HAVE_BLOCK;
//判断有没有满行的
for(let j=0;j<currentFall.length;j++){
for(let i=0;i<TETRIS_COLS; i++){
if(tetris_status[currentFall[j].y][i]==NO_BLOCK)
break;
//最后一行满了
if(i==TETRIS_COLS-1){
//消除最后一行
for(let i=currentFall[j].y; i>0;i--){
for(let j=0;j<TETRIS_COLS;j++)
tetris_status[i][j]=tetris_status[i-1][j];
}
//分数增加
curScore+=5;
localStorage.setItem("curScore", curScore);
if(curScore>maxScore){
//超越最高分
maxScore=curScore;
localStorage.setItem("maxScore", maxScore);
}
//加速
curSpeed+=0.1;
localStorage.setItem("curSpeed", curSpeed);
