mat_make.js

function mat_make(width, height, peak, way)
{
    var arr = []
    var ret = []
    for (var i = 0; i < height; i++)
        ret[i] = []
    
    // init
    for (var i = 0; i < width * height; i++)
        arr.push('A'.charCodeAt(0))

    // calc
    for (var i = 0; i < width * height; i++)
    {
        if (i <= peak)
            arr[i] += i
        else if (i - 2 * peak < 0)
            arr[i] += 2 * peak - i
    }

    // assemble
    for (var j = 0; j < height; j++)
        for (var i = 0; i < width; i++)
            ret[j][i] = String.fromCharCode((way) ? arr[j + i * height] : arr[i + j * width])

    return ret;
}