Degree.java :  » Algebra » symja » org » matheclipse » core » reflection » system » Java Open Source

package org.matheclipse.core.reflection.system;

import static org.matheclipse.core.expression.F.Power;
import static org.matheclipse.core.expression.F.Times;

import org.matheclipse.core.eval.interfaces.AbstractSymbolEvaluator;
import org.matheclipse.core.eval.interfaces.INumericConstant;
import org.matheclipse.core.expression.F;
import org.matheclipse.core.interfaces.IExpr;
import org.matheclipse.core.interfaces.ISymbol;
/**
 * The constant Degree converts to Pi/180 radians
 * 
 * See: <a href="http://en.wikipedia.org/wiki/Degree_(angle)">Degree (angle)</a>
 * 
 */
public class Degree extends AbstractSymbolEvaluator implements INumericConstant {
  final static public double DEGREE = 0.017453292519943295769236907684886127134428718885417;

  public Degree() {
  }

  /**
   * Constant Degree converted to Pi/180
   */
  @Override
  public IExpr evaluate(final ISymbol symbol) {
    // Pi / 180
    return Times(F.Pi, Power(F.integer(180), F.CN1));
  }

  @Override
  public IExpr numericEval(final ISymbol symbol) {
    return F.num(DEGREE);
  }

  public double evalReal() {
    return DEGREE;
  }

  @Override
  public void setUp(final ISymbol symbol) {
    symbol.setAttributes(ISymbol.CONSTANT);
  }
}