honzabrecka / gama Goto Github PK
View Code? Open in Web Editor NEWA practical 2D math/geometry library for functional JavaScript, based on Ramda.
License: MIT License
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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)
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];
};
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