A little library for converting compound CSS transforms into their matrix equivalents.
# using the default matrix# or using a custom 4x4 matrix (meaning some transformations are already applied)matrix =1234567890123456matrix
cssToMatrix =cssToMatrix# set some transformsrotate '90deg'translate3d 50100200# get a matrix backgetMatrix#=> [# [9.870993963020204, 0.7, 0, 0],# [-0.5, 0, 0, 0],# [0, 0, 1, 0],# [443.54969815101026, 35, 200, 1]# ]# .. or as a CSS propertycssToMatrixgetMatrixCSS#=> "matrix3d(9.870993963020204, 0.7, 0, 0, -0.5, 0, 0, 0, 0, 0, 1, 0, 443.54969815101026, 35, 200, 1)"# set a new base matrix (on the basis of which transforms are applied)cssToMatrixmatrix3141592653589793
why not use actual matricies?
If you're performing caculations dozens of times per second (in the case of animations. 60 times per second), performance is essential. Not only do we need to be able to perform calculations for complex compound 3D transforms at 60FPS, but we need to leave head room for any precursor computations, as well as compositing and painting. Performing the calculations ourselves (instead of leaving it to the CSS engine) gives us finer control over where (CPU vs. GPU, this thread vs. a WebWorker, sync vs. async) and when (precomputed, partially applied, realtime) computation occurs.
- accept alternative units for scalars (%, em, pt, etc.)
running the tests
npm igrunt test
then, open test/index.html in a browser