Anthony Palomba

I have been having trouble trying to send messages to JitterObjects.

var jitpath = new JitterObject("jit.path");

js: test.js: Javascript TypeError: jitpath.outputeval is not a function, line 54

Is there something I am missing? Are some messages not supported in JS?

var jitpath = new JitterObject("jit.path");
jitpath.append(10, 10);
jitpath.append(100, 100);
jitpath.append(200, 10);
jitpath.append(300, 100);
jitpath.calchandles();
jitpath.outputeval();

sending-messages-to-jitterobjects

this is not currently possible in JS, but i have enabled this functionality for the next update.

hi anthony.
this is not currently possible in JS, but i have enabled this functionality for the next update.


Hey Rob, thanks for your response. Do you know when this update will be released?

here's an example of how you can do this with 6.1.3.

the relevant messages are calc_outmatrix() and calc_evalmatrix().

the relevant attributes are outmatrixname and evalmatrixname.

outlets =2;
var jitpath = new JitterObject("jit.path");
jitpath.interpmode="spline";
jitpath.append(10, 10);
jitpath.append(100, 100);
jitpath.append(200, 10);
jitpath.append(300, 100);
jitpath.calchandles();
jitpath.calc_evalmatrix();
jitpath.calc_outmatrix();

function bang() {
    for(i=0; i


here's an example of how you can do this with 6.1.3.
the relevant messages are calc_outmatrix() and calc_evalmatrix().
the relevant attributes are outmatrixname and evalmatrixname.

outlets =2;
var jitpath = new JitterObject("jit.path");
jitpath.interpmode="spline";
jitpath.append(10, 10);
jitpath.append(100, 100);
jitpath.append(200, 10);
jitpath.append(300, 100);
jitpath.calchandles();
jitpath.calc_evalmatrix();
jitpath.calc_outmatrix();

function bang() {
	for(i=0; i


Hey Rob, glad to see that this made it in to the update. What I am trying to do is transfer the jitpath data to a matrix so that I can use getcell to step through data. How can I do this?

//pathMatrx = new JitterObject("jit.matrix", jitpath.outmatrixname); ???

function draw()
{
  jitpath.append(10, 10);
  jitpath.append(100, 100);
  jitpath.append(200, 10);
  jitpath.append(300, 100);
  jitpath.calchandles();
  jitpath.calc_evalmatrix();
  jitpath.calc_outmatrix();

  //pathMatrx = new JitterObject("jit.matrix", jitpath.outmatrixname); ???

  var p1, p2;
  for (var k = 0; k < 4; k++) {
    p1 = pathMatrx.getcell(0,k);
    p2 = pathMatrx.getcell(1,k);

    post("line_to", p1," ", p2, "\n");
    if(k == 0)
      mgfx.move_to(p1, p2);
    else
      mgfx.line_to(p1, p2);
  };

var pathMatrx = new JitterMatrix(jitpath.outmatrixname); 

following should work:var pathMatrx = new JitterMatrix(jitpath.outmatrixname); 


I am still seeing some odd behavior trying to combine jit.path in javascript. Here is my code so far...

pathMatrx = new JitterMatrix("jit.matrix", jitpath.outmatrixname);

warning: attempting to allocate matrix with less than 1 plane

var jitpath = new JitterObject("jit.path");
jitpath.intermode = "spline";

  pathMatrx = new JitterMatrix("jit.matrix", jitpath.outmatrixname);
  var matWidth = pathMatrx.dim[0];
  var matHeight = pathMatrx.dim[1];
  post("dim: " + pathMatrx.dim + "\n");

  for (var k = 0; k < matWidth; k++) {
    p1 = pathMatrx.getcell(0,0);
    p2 = pathMatrx.getcell(0,1);

    post("point", p1, " ", p2, "\n");
  };
}

u699000680: bad number
warning: attempting to allocate matrix with less than 1 plane
warning: attempting to allocate matrix with less than 1 plane
js: dim: 1,1
js: line_to   0     jsobject  0 

as written above, the way to create a JitterMatrix in js from an existing jitter matrix name is:

var pathMatrx = new JitterMatrix(jitpath.outmatrixname);

as written above, the way to create a JitterMatrix in js from an existing jitter matrix name is:
var pathMatrx = new JitterMatrix(jitpath.outmatrixname);


I fixed the error, and it looks like I am getting something that makes more sense.

Gahhh, sorry about that. My bad...
I fixed the error, and it looks like I am getting something that makes more sense. 

Hey Rob, I have had a chance to start digging in to this new js jit.path feature. I am seeing some strange behavior I was hoping you could shed some light on.

It looks like I can add points and evaluate the output, but the output does not seem to honor the interpmode specified. I am using spline but the output looks linear. Example patch is below...

// create a [jit.gl.render] object for drawing into our window:

var glrender = new JitterObject("jit.gl.render","render-ctx");

glrender.erase_color = [0,0,0,1]; // set background to black with full erase opacity (no trails):

var outmatrix = new JitterMatrix(4, "char", width, height);

var pathMatrx = new JitterMatrix(jitpath.evalmatrixname);

for (var j = 0; j < pathMatrx.dim; j++) {

post("x:", cell[0], " y:", cell[1], "\n");

autowatch = 1;
var width = 500;
var height = 300;

// create a [jit.gl.render] object for drawing into our window:
var glrender = new JitterObject("jit.gl.render","render-ctx");

// use a 2-dimensional projection:
glrender.ortho = 2;
glrender.blend_enable = 1;
glrender.blend = "alphablend";
glrender.depth_enable = 0;
glrender.erase_color = [0,0,0,1]; // set background to black with full erase opacity (no trails):

var mgfx = new MGraphics(width,height);
// init drawing context
mgfx.init();
mgfx.relative_coords = 0;
mgfx.autofill = 0;

function bang()
{
  drawProcessingScene();
}

function draw()
{
  mgfx.rectangle(0, 0, width, height);

  jitpath.clear();
  jitpath.append(10, 10);
  jitpath.append(20, 50);
  jitpath.append(100, 100);
  jitpath.append(200, 10);
  jitpath.append(300, 100);
  jitpath.calchandles();
  jitpath.calc_evalmatrix();
  //jitpath.calc_outmatrix();

  var pathMatrx = new JitterMatrix(jitpath.evalmatrixname);
  var matWidth = pathMatrx.dim[0];
  var matHeight = pathMatrx.dim[1];
  post("dim: " + pathMatrx.dim + "\n");

  mgfx.set_source_rgba(1, 1, 1, 1);
  mgfx.set_line_width(1);

  var x, y, cell;
  for (var j = 0; j < pathMatrx.dim; j++) {
    cell = pathMatrx.getcell(j);
    post("x:", cell[0], " y:", cell[1], "\n");

    if(j == 0)
      mgfx.move_to(cell[0], cell[1]);
    else
      mgfx.line_to(cell[0], cell[1]);
  }

  mgfx.set_source_rgba(1, 1, 1, 1);
  mgfx.set_line_width(1);
  mgfx.move_to(10, 10);
  mgfx.line_to(100, 100);
  mgfx.stroke();

function drawProcessingScene()
{
  var theImage = null;

  mgfx.identity_matrix();
  theImage = new Image(mgfx.pop_group());
  mgfx.image_surface_draw(theImage);

  theImage.tonamedmatrix(outmatrix.name);
  outlet(0, "jit_matrix", outmatrix.name);

you have a typo at line 22: jitpath.intermode = "spline";

I really wish javascript could catch things like that.

Thanks again, your are an outstanding gentleman.

I really wish javascript could catch things like that.
Thanks again, your are an outstanding gentleman.


Sending messages to JitterObjects