apply and expression to jit.noise

    Jan 18 2010 | 7:44 am
    I am trying to port this simple jitter code into java:
    However, i am finding difficulties to apply the expression to the noise. Maybe a simple solution but i haven't been able to figure it out. I realize that i suck in java!
    So far this:
    import com.cycling74.max.*;
    import com.cycling74.jitter.*;
    public class NoiseExpr2 extends MaxObject
    JitterObject noiss;
    JitterObject expression;
    JitterMatrix dim1;
    JitterMatrix dim2;
    public NoiseExpr2(Atom[] args){
    declareInlets(new int[]{DataTypes.ALL});
    declareOutlets(new int[]{DataTypes.ALL});
    noiss=new JitterObject( "jit.noise");
    expression=new JitterObject("jit.expr");
    expression.setAttr("expr","hypot((norm[0]-0.5)+((in[0]*0.1)-0.05) , (norm[1]-0.5))");
    dim1=new JitterMatrix("dimen",3,"float32",10,100);
    //noiss.expr("hypot((norm[0]-0.5)+((in[0]*0.1)-0.05) , (norm[1]-0.5))");
    public void bang(){
    outlet(0,"jit_matrix",new Atom[]{Atom.newAtom(dim1.getName())});
    any idea?

    • Jan 18 2010 | 7:59 am
      one way to create a JitterObject:
      JitterObject(java.lang.String classname, com.cycling74.max.Atom[] args)
      creates a JitterObject
      so your noiss should be
      // jit.noise 12 float32 10 10
      Atom[] args = new Atom[] {
      noiss=new JitterObject("jit.noise", args);
      also, you could check if your noiss.matrixcalc is succesfull by doing
      boolean success = noiss.matrixcalc(null,dim1);
      post("noiss succes: "+success);
      btw. the outlet can also be called like this:
      outlet(0,"jit_matrix", dim1.getName());
      (no need to create atoms)
      I am doing this off the top of my head, so I can't guarantee success.
      Alos, I haven't worked with JitterObjects like noise in java yet either...
      Will get back to it.
    • Jan 18 2010 | 8:11 am
      Thank you Marcus:
      nice tips!. However, the problem is not to generate the noise in java(that is working already) but to apply the expression to the matrix. Somehow i was thinking that by using the expr as a method(noiss.expr) it would work, but it didn't.
    • Jan 18 2010 | 5:17 pm
      Another option might be to use the java lang directly. But it seems strange that jit.expr cannot be used as a simple JitterObject
    • Jan 19 2010 | 1:54 am
      It's working:
      import com.cycling74.jitter.JitterMatrix;
      import com.cycling74.jitter.JitterObject;
      import com.cycling74.max.DataTypes;
      import com.cycling74.max.MaxObject;
      public class NoiseExpr2 extends MaxObject {
      	JitterObject noise;
      	JitterMatrix noiseOut;
      	JitterObject expression;
      	JitterMatrix expressionOut;
      	public NoiseExpr2() {
      		declareOutlets(new int[] {DataTypes.ALL, DataTypes.ALL});
      		// jit.noise 12 float32 10 10
      		noise = new JitterObject("jit.noise");//, noiseArgs);
      		noise.setAttr("planecount", 12);
      		noise.setAttr("type", "float32");
      		noise.setAttr("dim", new int[] { 10,10});
      		noiseOut = new JitterMatrix(12, "float32", 10, 10);
      		// jit.expr @expr "hypot((norm[0]-0.5)+((in[0]*0.1)-0.05) , (norm[1]-0.5))"
      		expression=new JitterObject("jit.expr");
      		expression.setAttr("expr","hypot((norm[0]-0.5)+((in[0]*0.1)-0.05) , (norm[1]-0.5))");
      		expressionOut = new JitterMatrix(12, "float32", 10, 10);
      	public void bangnoise() {
      		noise.matrixcalc(null, noiseOut);
      		outlet(1, "jit_matrix", noiseOut.getName());
      	public void bang() {
      		expression.matrixcalc(noiseOut, expressionOut);
      		outlet(0, "jit_matrix", expressionOut.getName());
    • Jan 19 2010 | 1:56 am
      And here's an example patch using this object:
    • Jan 19 2010 | 3:35 am
      Thank you Marcus!
      You are really a java-jitter guru
      it is quite interesting the use of two matrices