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added hotplate2

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AJ ONeal 2013-05-27 22:30:52 -05:00
parent 4ccf7cefcc
commit 5792b9d92e
1 changed files with 188 additions and 0 deletions
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hotplate2.js Normal file
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/*
* The hotplat could be represented (6x6) as
*
* 0 * * * * 0
* * * * * * *
* * * 1 1 * *
* * * 1 1 * *
* * * * * * *
* 0 * * * * 0
*
*/
(function () {
"use strict";
var red = '\u001b[31m'
, yellow = '\u001b[33m'
, blue = '\u001b[34m'
, reset = '\u001b[0m'
;
function pad(num) {
num = String(num);
while (num.length < 6) {
num = ' ' + num;
}
return num;
}
/*
* rows: number of rows
* cols: number of columns
* diff: maximum allowable difference
* initial: the start value of each cell
* turns: maximum number of turns
*/
function HotPlate(opts) {
var me = this
;
me.numrows = opts.rows;
me.numcols = opts.cols;
me.prevRows = [];
me.nextRows = [];
me.maxDiff = opts.diff || 0.00001;
me.maxTurns = opts.turns || 100 * 1000;
me.initializeGrid(me.prevRows);
me.initializeGrid(me.nextRows);
//console.log(me.prevRows);
//console.log(me.nextRows);
}
HotPlate.prototype.initializeGrid = function (rows) {
var me = this
, row
, i
, j
;
for (i = 0; i < me.numrows; i += 1) {
row = [];
rows.push(row);
for (j = 0; j < me.numcols; j += 1) {
row.push(me.initial || 0);
}
}
// 0, 1, 2, [3, 4], 5, 6, 7
rows[(me.numrows / 2) - 1][(me.numcols / 2) - 1] = 100;
rows[(me.numrows / 2) - 1][(me.numcols / 2)] = 100;
rows[(me.numrows / 2)][(me.numcols / 2) - 1] = 100;
rows[(me.numrows / 2)][(me.numcols / 2)] = 100;
};
HotPlate.prototype.run = function () {
var me = this
, diff = 100
, sum
, count
, i
, j
, rows
, turns = 0
, str
, color
;
while (diff > me.maxDiff && turns < me.maxTurns) {
turns += 1;
diff = 0;
for (i = 0; i < me.numrows; i += 1) {
for (j = 0; j < me.numcols; j += 1) {
// ignore the cold cells (cornermost)
if (
(i === 0 && j === 0)
|| (i === 0 && j === me.numcols - 1)
|| (i === me.numrows - 1 && j === 0)
|| (i === me.numrows - 1 && j === me.numcols - 1)
) {
continue;
}
// ignore hot cells (centermost)
if (
(i === (me.numrows / 2) - 1 && j === (me.numcols / 2) - 1)
|| (i === (me.numrows / 2) - 1 && j === (me.numcols / 2))
|| (i === (me.numrows / 2) && j === (me.numcols / 2) - 1)
|| (i === (me.numrows / 2) && j === (me.numcols / 2))
) {
continue;
}
// add up, left, right, down and self values
// (but only if they exist)
rows = me.prevRows;
//console.log(rows);
sum = 0;
count = 0;
if (i > 0) {
count += 1;
sum += rows[i - 1][j];
//console.log('i>0:', rows[i - 1] + rows[j]);
}
if (i < me.numrows - 1) {
count += 1;
sum += rows[i + 1][j];
//console.log('i<last:', rows[i + 1] + rows[j]);
}
if (j > 0) {
count += 1;
sum += rows[i][j - 1];
//console.log('j>0:', rows[i] + rows[j - 1]);
}
if (j < me.numcols - 1) {
count += 1;
sum += rows[i][j + 1];
//console.log('j<last:', rows[i] + rows[j + 1]);
}
/*
console.log(
'i:' + i
, 'j:' + j
, 'i,j:' + me.nextRows[i][j]
, 'sum:' + sum
, 'count:' + count
, 'avg:' + sum / count
);
*/
me.nextRows[i][j] = sum / count;
diff = Math.max(diff, Math.abs(me.nextRows[i][j] - me.prevRows[i][j]));
}
}
me.prevRows = me.nextRows;
me.nextRows = [];
me.initializeGrid(me.nextRows);
}
console.log('Grid:', me.numrows + 'x' + me.numcols);
console.log('Turns:', turns);
console.log('Diff:', me.maxDiff);
for (i = 0; i < me.numrows; i += 1) {
str = '';
for (j = 0; j < me.numcols; j += 1) {
if (me.prevRows[i][j] < 33) {
color = blue;
} else if (me.prevRows[i][j] > 66) {
color = red;
} else {
color = yellow;
}
str += ' ' + color + pad((me.prevRows[i][j]).toFixed(2));
}
console.log(str);
}
console.log(reset + 'Actual Diff:', diff);
};
HotPlate.create = function (opts) {
return new HotPlate(opts);
};
HotPlate.create({ cols: 8, rows: 16}).run();
}());