1 /*
   2  * Copyright (c) 2007, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /* @test
  25    @summary Test ModelStandardTransform transform method */
  26 
  27 import com.sun.media.sound.ModelStandardTransform;
  28 
  29 public class TransformConvex {
  30 
  31     private static boolean checkLinearity(ModelStandardTransform transform)
  32     {
  33         double lastx = 0;
  34         for (int p = 0; p < 2; p++)
  35         for (int d = 0; d < 2; d++)
  36         for (double i = 0; i < 1.0; i+=0.001) {
  37             if(p == 0)
  38                 transform.setPolarity(ModelStandardTransform.POLARITY_UNIPOLAR);
  39             else
  40                 transform.setPolarity(ModelStandardTransform.POLARITY_BIPOLAR);
  41             if(d == 0)
  42                 transform.setDirection(ModelStandardTransform.DIRECTION_MIN2MAX);
  43             else
  44                 transform.setDirection(ModelStandardTransform.DIRECTION_MAX2MIN);
  45             double x = transform.transform(i);
  46             if(i == 0)
  47                 lastx = x;
  48             else
  49             {
  50                 if(lastx - x > 0.2) return false;
  51                 lastx = x;
  52             }
  53         }
  54         return true;
  55     }
  56 
  57     private static void assertTrue(boolean value) throws Exception
  58     {
  59         if(!value)
  60             throw new RuntimeException("assertTrue fails!");
  61     }
  62 
  63     public static void main(String[] args) throws Exception {
  64         ModelStandardTransform transform = new ModelStandardTransform();
  65         transform.setTransform(ModelStandardTransform.TRANSFORM_CONVEX);
  66         assertTrue(checkLinearity(transform));
  67 
  68         transform.setDirection(ModelStandardTransform.DIRECTION_MIN2MAX);
  69         transform.setPolarity(ModelStandardTransform.POLARITY_UNIPOLAR);
  70         assertTrue(Math.abs(transform.transform(0.0f) - 0.0f) < 0.0001f);
  71         assertTrue(transform.transform(0.5f) > 0.5f);
  72         assertTrue(Math.abs(transform.transform(1.0f) - 1.0f) < 0.0001f);
  73 
  74         transform.setDirection(ModelStandardTransform.DIRECTION_MAX2MIN);
  75         transform.setPolarity(ModelStandardTransform.POLARITY_UNIPOLAR);
  76         assertTrue(Math.abs(transform.transform(1.0f) - 0.0f) < 0.0001f);
  77         assertTrue(transform.transform(0.5f) > 0.5f);
  78         assertTrue(Math.abs(transform.transform(0.0f) - 1.0f) < 0.0001f);
  79 
  80         transform.setDirection(ModelStandardTransform.DIRECTION_MIN2MAX);
  81         transform.setPolarity(ModelStandardTransform.POLARITY_BIPOLAR);
  82         assertTrue(Math.abs(transform.transform(0.0f) + 1.0f) < 0.0001f);
  83         assertTrue(transform.transform(0.25f) < -0.5f);
  84         assertTrue(Math.abs(transform.transform(0.5f) - 0.0f) < 0.0001f);
  85         assertTrue(transform.transform(0.75f) > 0.5f);
  86         assertTrue(Math.abs(transform.transform(1.0f) - 1.0f) < 0.0001f);
  87 
  88         transform.setDirection(ModelStandardTransform.DIRECTION_MAX2MIN);
  89         transform.setPolarity(ModelStandardTransform.POLARITY_BIPOLAR);
  90         assertTrue(Math.abs(transform.transform(1.0f) + 1.0f) < 0.0001f);
  91         assertTrue(transform.transform(0.75f) < -0.5f);
  92         assertTrue(Math.abs(transform.transform(0.50f) - 0.0f) < 0.0001f);
  93         assertTrue(transform.transform(0.25f) > 0.5f);
  94         assertTrue(Math.abs(transform.transform(0.0f) - 1.0f) < 0.0001f);
  95     }
  96 }