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TransposeMatrix.js
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TransposeMatrix.js
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/**
* @author Richard Davey <rich@phaser.io>
* @copyright 2013-2024 Phaser Studio Inc.
* @license {@link https://opensource.org/licenses/MIT|MIT License}
*/
/**
* Transposes the elements of the given matrix (array of arrays).
*
* The transpose of a matrix is a new matrix whose rows are the columns of the original.
*
* A matrix is a two-dimensional array (array of arrays), where all sub-arrays (rows)
* have the same length. There must be at least two rows. This is an example matrix:
*
* ```
* [
* [ 1, 1, 1, 1, 1, 1 ],
* [ 2, 0, 0, 0, 0, 4 ],
* [ 2, 0, 1, 2, 0, 4 ],
* [ 2, 0, 3, 4, 0, 4 ],
* [ 2, 0, 0, 0, 0, 4 ],
* [ 3, 3, 3, 3, 3, 3 ]
* ]
* ```
*
* @function Phaser.Utils.Array.Matrix.TransposeMatrix
* @since 3.0.0
*
* @generic T
* @genericUse {T[][]} - [array,$return]
*
* @param {T[][]} [array] - The array matrix to transpose.
*
* @return {T[][]} A new array matrix which is a transposed version of the given array.
*/
var TransposeMatrix = function (array)
{
var sourceRowCount = array.length;
var sourceColCount = array[0].length;
var result = new Array(sourceColCount);
for (var i = 0; i < sourceColCount; i++)
{
result[i] = new Array(sourceRowCount);
for (var j = sourceRowCount - 1; j > -1; j--)
{
result[i][j] = array[j][i];
}
}
return result;
};
module.exports = TransposeMatrix;