// This is the file interp.java
import vrml.*;
import vrml.node.*;
import vrml.field.*;
import java.lang.Math;

public class interp extends Script {
   private ConstSFFloat set_fraction;  // set_fraction as a ConstSFFloat,
   private float frac;                 // same thing as a Java float.
   private MFVec3f value_changed;      // value_changed eventOut as MFVec3f,
   private float vals[][];             // same thing as a Java float array.

   // This function gets a handle to the value_changed eventOut
   // and sets up the array that will be converted to it. 

   public void initialize() {
      value_changed = (MFVec3f) getEventOut("value_changed");
      vals = new float[37][3];
   }

   public void processEvent(Event e){
      set_fraction = (ConstSFFloat) e.getValue(); // Get set_fraction eventIn 
      frac = set_fraction.getValue(); // Convert it from SFFloat to java float

      // Compute the array entries as before (0.3f means 0.3 as a float, 
      // 0.3 by itself means double). 

      for (int i = 0; i < 37; i++) {
	 vals[i][0] = 0.23f * i - 4.23f;
	 vals[i][1] = 0.0f;
	 vals[i][2] = (float)Math.sin((i/9.0f - frac*2.0f) * 3.14f);
      }
      vals[0][0] = -4.1f;
      vals[4][2] = (vals[5][2] + vals[4][2])/2.0f;
      vals[3][2] = vals[4][2];
      vals[2][2] = vals[3][2];
      vals[1][2] = vals[2][2];
      vals[0][2] = vals[1][2];

      value_changed.setValue(vals);  // Save the vals array in the eventOut
   }
}