/** Re-crunch the numbers to get new wave data. */
public void recalculateBytes() {
chan.setValues(vol.getValue(), freq.getValue(), dur.getValue(), eq.getText());
int duration = (int) (dur.getValue() / 1000.0 * sps);
myEnviron.put("sps", sps);
myEnviron.put("bps", sps);
myEnviron.put("dur", duration);
myEnviron.put("period", sps / (double) freq.getValue());
myEnviron.put("freq", freq.getValue());
myEnviron.put("vol", vol.getValue());
byte[] ret = new byte[duration];
myEnviron.put("z", ret);
String script = "function calc(x) { return " + eq.getText() + "; }";
script += " for (i = 0; i < " + duration + "; i++) z[i] = calc(i); z;";
try {
ret = (byte[]) myEnviron.engine.eval(script);
} catch (ScriptException e) {
System.err.println(e.getMessage());
}
// byte[] ret = new byte[duration];
// for (int i = 0; i < ret.length; i++)
// {
// ret[i] = (byte) (vol.getValue() * Math.sin(i / (sps / (double) freq.getValue()) * 2 *
// Math.PI));
// // ret[i] = (byte) eval(eq.getText(),"x=" + i + ", freq=" + freq.getValue() + ", vol="
// // + vol.getValue());
// }
for (int i = 0; i < 100 && i < ret.length; i++) System.out.print(ret[i] + ", ");
System.out.println();
waveData = ret;
if (renderPane != null) {
renderPane.renew();
renderPane.updateUI();
}
}
/**
* Wrap to myEnviron.eval(), for convenience. Evaluates the given expression via our math engine.
*
* @param expression The expression to evaluate.
* @return The value gleaned from the given expression.
*/
static double eval(String expression) {
// FIXME: Recasting from 'Double' to 'double' to 'Double' to 'double'?
return (Double) myEnviron.eval(expression);
}