content: /*
   * Copyright (C) 2011 The Android Open Source Project
   *
   * 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.
   */
  
  
  package android.filterpacks.numeric;
  
  import android.filterfw.core.Filter;
  import android.filterfw.core.FilterContext;
  import android.filterfw.core.Frame;
  import android.filterfw.core.FrameFormat;
  import android.filterfw.core.GenerateFieldPort;
  import android.filterfw.format.ObjectFormat;
  
  import java.lang.Math;
  
  /**
   * @hide
   */
  public class SinWaveFilter extends Filter {
  
      @GenerateFieldPort(name = "stepSize", hasDefault = true)
      private float mStepSize = 0.05f;
  
      private float mValue = 0.0f;
  
      private FrameFormat mOutputFormat;
  
      public SinWaveFilter(String name) {
          super(name);
      }
  
      @Override
      public void setupPorts() {
          mOutputFormat = ObjectFormat.fromClass(Float.class, FrameFormat.TARGET_SIMPLE);
          addOutputPort("value", mOutputFormat);
      }
  
      @Override
      public void open(FilterContext env) {
          mValue = 0.0f;
      }
  
      @Override
      public void process(FilterContext env) {
          Frame output = env.getFrameManager().newFrame(mOutputFormat);
          output.setObjectValue(((float)Math.sin(mValue) + 1.0f) / 2.0f);
          pushOutput("value", output);
          mValue += mStepSize;
          output.release();
      }
  
  
  }
  