test/javax/sound/midi/Gervill/ModelStandardTransform/TransformConcave.java

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/* @test
   @summary Test ModelStandardTransform transform method */

import com.sun.media.sound.ModelStandardTransform;

public class TransformConcave {

    private static boolean checkLinearity(ModelStandardTransform transform)
    {
        double lastx = 0;
        for (int p = 0; p < 2; p++)
        for (int d = 0; d < 2; d++)
        for (double i = 0; i < 1.0; i+=0.001) {
            if(p == 0)
                transform.setPolarity(ModelStandardTransform.POLARITY_UNIPOLAR);
            else
                transform.setPolarity(ModelStandardTransform.POLARITY_BIPOLAR);
            if(d == 0)
                transform.setDirection(ModelStandardTransform.DIRECTION_MIN2MAX);
            else
                transform.setDirection(ModelStandardTransform.DIRECTION_MAX2MIN);
            double x = transform.transform(i);
            if(i == 0)
                lastx = x;
            else
            {
                if(lastx - x > 0.2) return false;
                lastx = x;
            }
        }
        return true;
    }

    private static void assertTrue(boolean value) throws Exception
    {
        if(!value)
            throw new RuntimeException("assertTrue fails!");
    }

    public static void main(String[] args) throws Exception {
        ModelStandardTransform transform = new ModelStandardTransform();
        transform.setTransform(ModelStandardTransform.TRANSFORM_CONCAVE);
        assertTrue(checkLinearity(transform));

        transform.setDirection(ModelStandardTransform.DIRECTION_MIN2MAX);
        transform.setPolarity(ModelStandardTransform.POLARITY_UNIPOLAR);
        assertTrue(Math.abs(transform.transform(0.0f) - 0.0f) < 0.0001f);
        assertTrue(transform.transform(0.5f) < 0.5f);
        assertTrue(Math.abs(transform.transform(1.0f) - 1.0f) < 0.0001f);

        transform.setDirection(ModelStandardTransform.DIRECTION_MAX2MIN);
        transform.setPolarity(ModelStandardTransform.POLARITY_UNIPOLAR);
        assertTrue(Math.abs(transform.transform(1.0f) - 0.0f) < 0.0001f);
        assertTrue(transform.transform(0.5f) < 0.5f);
        assertTrue(Math.abs(transform.transform(0.0f) - 1.0f) < 0.0001f);

        transform.setDirection(ModelStandardTransform.DIRECTION_MIN2MAX);
        transform.setPolarity(ModelStandardTransform.POLARITY_BIPOLAR);
        assertTrue(Math.abs(transform.transform(0.0f) + 1.0f) < 0.0001f);
        assertTrue(transform.transform(0.25f) > -0.5f);
        assertTrue(Math.abs(transform.transform(0.5f) - 0.0f) < 0.0001f);
        assertTrue(transform.transform(0.75f) < 0.5f);
        assertTrue(Math.abs(transform.transform(1.0f) - 1.0f) < 0.0001f);

        transform.setDirection(ModelStandardTransform.DIRECTION_MAX2MIN);
        transform.setPolarity(ModelStandardTransform.POLARITY_BIPOLAR);
        assertTrue(Math.abs(transform.transform(1.0f) + 1.0f) < 0.0001f);
        assertTrue(transform.transform(0.75f) > -0.5f);
        assertTrue(Math.abs(transform.transform(0.50f) - 0.0f) < 0.0001f);
        assertTrue(transform.transform(0.25f) < 0.5f);
        assertTrue(Math.abs(transform.transform(0.0f) - 1.0f) < 0.0001f);
    }
}