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A practical 2D math/geometry library for functional JavaScript, based on Ramda.

License: MIT License

JavaScript 100.00%
functional geometry-library javascript math matrix ramda

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crosseye avatar gilbox avatar honzabrecka avatar

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crosseye gilbox phpsmarter

gama's Issues

Why are Matrices represented by columns?

Hi, gama is really cool :) I'm not terribly experienced with using matrix-math libraries so please excuse me if the answer to my question is very obvious.

I was wondering, why are matrix arrays laid out by columns? I mean, if they used rows it would be nice to be able to write a matrix like this:

[1, 0, 0,
 0, 1, 0,
 0, 0, 1]

But the way gama works this would be really confusing since the rows would actually represent columns.

btw, invertMatrix would be nice to have...

var invertMatrix = m => {
  var det = m[0]*m[4]*m[8]
            + m[1]*m[5]*m[6]
            + m[2]*m[3]*m[7]
            - m[0]*m[5]*m[7]
            - m[1]*m[3]*m[8]
            - m[2]*m[4]*m[6];

  return [(m[4] * m[8] - m[5] * m[7]) / det,
          (m[2] * m[7] - m[1] * m[8]) / det,
          (m[1] * m[5] - m[2] * m[4]) / det,
          (m[5] * m[6] - m[3] * m[8]) / det,
          (m[0] * m[8] - m[2] * m[6]) / det,
          (m[2] * m[3] - m[0] * m[5]) / det,
          (m[3] * m[7] - m[4] * m[6]) / det,
          (m[1] * m[6] - m[0] * m[7]) / det,
          (m[0] * m[4] - m[1] * m[3]) / det];
};

Re: change matrix represenation

This commit has some bug I haven't figured out yet, but l am also wondering about the gama.Matrix function signature. Should it be changed to this?

gama.Matrix = function(a, b, tx, c, d, ty)

Currently it is this:

gama.Matrix = function(a, b, c, d, tx, ty)

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