Get a matrix from a patcher to javascript?

    Oct 20 2011 | 4:16 pm
    Could Anyone explain how to get a matrix from a patcher and process it inside javascript. What kind of function do I need in JS?
    Tutorials explain how to send a processed matrix from javascript out of the [js] object with the outlet() method, to the patcher but not how to retrieve a matrix inside the [js] FROM the patcher.

    • Oct 20 2011 | 4:47 pm
      Here's how to get a matrix object in JS with the same data as the input matrix name.
      function jit_matrix(name) { // create matrix with the same name as the input matrix var mat = new JitterObject("jit.matrix", name); var cell = mat.getcell(0, 0); post("res: "+cell+"n"); }
    • Oct 21 2011 | 2:10 pm
      Okay, thank you, nice, but how do I process the matrix now? Does it need to be inside the function itself. After several attempt this not works:
      //////////////////////////////////////////////////// var mydimmap = new JitterObject("jit.dimmap"); mydimmap.invert = [1, 1];
      var mtrx2 = new JitterMatrix(4, "char", 320, 240 ); mtrx2.adapt = 1;
      function jit_matrix(ext) { var mtrx = new JitterObject("jit.matrix", ext); mtrx2.frommatrix(mtrx); mtrx2.matrixcalc(mtrx, mydimmap); outlet(0, "jit_matrix",; }
      >>> Javascript TypeError: mtrx2.matrixcalc is not a function, line 15
      I can't achieve to process the matrix inside another function anymore. This lacks in the JS tutorials.
    • Oct 22 2011 | 12:32 pm
      Okay, after a good night I go this way:
      ///////////////////// process&output2.js
      autowatch = 1;
      var mtrx = new JitterMatrix(4, "char", 320, 240); var opfloat;
      function recupop(v) { opfloat = v; }
      function bang() { mtrx.op("*", opfloat); }
      function jit_matrix(ext) { { = ext; }
      { bang(); } outlet(0, "jit_matrix",; } //////////////////////////
    • Oct 22 2011 | 12:40 pm
      I am aware that this code is elementary for programmers, but I'm not, I'm only an artist and I think Max is really interesting for its accessibility and documentation. Such basic code should be in the doc because it would allow to gain some days ... yes. I think we need needs more JS basic tutorials ...
      Anyway thanks for the example, Wes, on how to retrieve the matrix in JS. (more, more, more ;-)