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/*
* Copyright 2009 Phil Burk, Mobileer Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Aug 26, 2009
* com.jsyn.engine.units.TunableFilter.java
*/
package com.jsyn.unitgen;
import com.jsyn.data.Function;
import com.jsyn.ports.UnitFunctionPort;
import com.jsyn.ports.UnitInputPort;
/**
* Convert an input value to an output value. The Function is typically implemented by looking up a
* value in a DoubleTable. But other implementations of Function can be used. Input typically ranges
* from -1.0 to +1.0.
*
* <pre>
* <code>
* // A unit that will lookup the function.
* FunctionEvaluator shaper = new FunctionEvaluator();
* synth.add( shaper );
* shaper.start();
* // Define a custom function.
* Function cuber = new Function()
* {
* public double evaluate( double x )
* {
* return x * x * x;
* }
* };
* shaper.function.set(cuber);
*
* shaper.input.set( 0.5 );
* </code>
* </pre>
*
* @author Phil Burk (C) 2009 Mobileer Inc
* @see Function
*/
public class FunctionEvaluator extends UnitFilter {
public UnitInputPort amplitude;
public UnitFunctionPort function;
public FunctionEvaluator() {
addPort(amplitude = new UnitInputPort("Amplitude", 1.0));
addPort(function = new UnitFunctionPort("Function"));
}
@Override
public void generate(int start, int limit) {
double[] inputs = input.getValues();
double[] amplitudes = amplitude.getValues();
double[] outputs = output.getValues();
Function functionObject = function.get();
for (int i = start; i < limit; i++) {
outputs[i] = functionObject.evaluate(inputs[i]) * amplitudes[i];
}
}
}
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