上一节 里沃特与我们分享了《五子飞》的下棋规则，可能有些伙伴看得不清楚，像我们码农还是看到代码比较靠谱。下面就把可以走棋的路线跟大家说一下。
假设从左上角开始，以0开始编号，往右数（没看第一节棋盘的先去看一下）（因为路线比较简单，就直接写固定的数据了）：
1.横着走有5条直线：
var lines_h = [
[ 0, 1, 2, 3, 4],
[ 5, 6, 7, 8, 9],
[10, 11, 12, 13, 14],
[15, 16, 17, 18, 19],
[20, 21, 22, 23, 24]
];
2.竖着走也有5条直线：
var lines_v = [
[ 0, 5, 10, 15, 20],
[ 1, 6, 11, 16, 21],
[ 2, 7, 12, 17, 22],
[ 3, 8, 13, 18, 23],
[ 4, 9, 14, 19, 24]
];
3.另外还有6条斜线可走：
var lines_o = [
[ 0, 6, 12, 18, 24],
[ 4, 8, 12, 16, 20],
[ 2, 6, 10],
[ 2, 8, 14],
[10, 16, 22],
[14, 18, 22]
];
合起来即理论下可以走的路线如下：
// 可走的路线
var lines = [
[ 0, 1, 2, 3, 4],
[ 5, 6, 7, 8, 9],
[10, 11, 12, 13, 14],
[15, 16, 17, 18, 19],
[20, 21, 22, 23, 24],
[ 0, 5, 10, 15, 20],
[ 1, 6, 11, 16, 21],
[ 2, 7, 12, 17, 22],
[ 3, 8, 13, 18, 23],
[ 4, 9, 14, 19, 24],
[ 0, 6, 12, 18, 24],
[ 4, 8, 12, 16, 20],
[ 2, 6, 10],
[ 2, 8, 14],
[10, 16, 22],
[14, 18, 22]
];
分别用 A,B 表示对战双方：
var Player = { A: 0, B: 1, None: -1 };
棋盘我们直接在 canvas 上画，棋子准备两个小图片：
为棋子定义一个对象：
function Point(x, y, index) {
this.x = x;
this.y = y;
this.index = index;
}
function Bounds(x, y, w, h) {
this.x = x;
this.y = y;
this.w = w;
this.h = h;
this.toArray = function () {
return [this.x, this.y, this.w, this.h];
};
this.toArrayXY = function () {
return [this.x, this.y, this.x + this.w, this.y + this.h];
};
}
// 棋子
function Chess(player) {
this.player = player;
this.point = new Point(-1, -1, -1);
this.bounds = new Bounds(-1, -1, -1, -1);
this.moveTo = function (chess) {
chess.player = this.player;
this.player = Player.None;
};
}
棋盘上棋子定义（棋子初始化）：
var i;
var cpc = 5;
var ctc = Math.pow(cpc, 2);
var chesses = [];
// 分配棋子
for (i = 0; i < cpc; i++) {
chesses[i].player = Player.A;
}
for (i = cpc; i < ctc - cpc; i++) {
chesses[i].player = Player.None;
}
for (i = ctc - cpc; i < ctc; i++) {
chesses[i].player = Player.B;
}
for (i = 0; i < ctc; i++) {
chesses[i].point = new Point(i % cpc, parseInt(i / cpc, 10), i);
}
这样，路线和棋子初始化就已经比较清楚了，下一节我们开始在 canvas 上把棋子画好。
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