为矩阵添加常用方法(2)

Mat.prototype.rowRange = function(__i, __j){
var len = this.col * this.channel,
rowLen = len * this.bytes,
array = [],
i = __i || 0,
j = __j || this.row;
function getAllElement(__constructor){
var row = this.row;
for(var k = i; k <= j; k++){
array.push(new __constructor(this.buffer, k * rowLen, len));
}
}
getAllElement(this.data.constructor);
return array;
};

复制代码 代码如下:

Mat.prototype.colRange = function(__i, __j){
var len = this.col * this.channel,
rowLen = len * this.bytes,
array = [],
i = __i || 0,
j = __j || this.col;
function getAllElement(__constructor){
var row = this.row
channel = this.channel;
for(var k = 0; k < row; k++){
array.push(new __constructor(this.buffer, k * rowLen + __i, (__j - __i + 1) * channel));
}
}
getAllElement(Float64Array);
return array;
};

这四种方法返回的都是一种Array<TypedArray>的数组。如果要获取这个数组rect第j行，第k列的元素，则可用：
rect[j][k]

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