Android Open Source - AniDroid Ani Util

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Back to project page AniDroid.

License

The source code is released under:

GNU Lesser General Public License

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Java Source Code

package net.mediavrog.ani;
//www  .  java  2s.  c om
public class AniUtil {

  /**
   * @see <a href="http://processing.googlecode.com/svn/trunk/processing/build/javadoc/core/processing/core/PConstants.html">processing/core/PConstants</a>
   */
  private static final float TWO_PI = 6.28318530717958647693f;

  /**
   * Calculates the minimal difference of two angles given in radians.
   * by Hartmut Bohnacker.
   *
   * @param theAngle1 Angle to subtract from
   * @param theAngle2 Angle to subtract
   * @return Angle between -PI and PI (-180? and 180?)
   */
  public static float shortRotation(float theAngle1, float theAngle2) {
    float a1 = (theAngle1 % TWO_PI + TWO_PI) % TWO_PI;
    float a2 = (theAngle2 % TWO_PI + TWO_PI) % TWO_PI;

    if (a2 > a1) {
      float d1 = a2 - a1;
      float d2 = a1 + TWO_PI - a2;
      if (d1 <= d2) {
        return -d1;
      } else {
        return d2;
      }
    } else {
      float d1 = a1 - a2;
      float d2 = a2 + TWO_PI - a1;
      if (d1 <= d2) {
        return d1;
      } else {
        return -d2;
      }
    }
  }

  public static float constrain(float theValue, float min, float max) {
    return theValue < min ? min : (theValue > max ? max : theValue);
  }

  /**
   * @see <a href="https://github.com/esmasui/processing-fragment/blob/master/core/src/processing/core/PApplet.java">processing/core/PApplet</a>
   */
  public static final float map(float value,
                  float istart, float istop,
                  float ostart, float ostop) {
    return ostart + (ostop - ostart) * ((value - istart) / (istop - istart));
  }
}

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