Given a number, round up to the nearest power of ten times 1, 2, or 5. The argument must be strictly positive. : Time « Date Type « Android






  1. Android
  2. Date Type
  3. Time

Given a number, round up to the nearest power of ten times 1, 2, or 5. The argument must be strictly positive.

  
/**
 * Copyright (C) 2009, 2010 SC 4ViewSoft SRL
 *  
 * 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 org.achartengine.util;

import java.text.NumberFormat;
import java.util.List;

/**
 * Utility class for math operations.
 */
class MathHelper {
  /** A value that is used a null value. */
  public static final double NULL_VALUE = Double.MAX_VALUE;
  /**
   * A number formatter to be used to make sure we have a maximum number of
   * fraction digits in the labels.
   */
  private static final NumberFormat FORMAT = NumberFormat.getNumberInstance();

  private MathHelper() {
    // empty constructor
  }
   /**
     * Given a number, round up to the nearest power of ten times 1, 2, or 5. The
     * argument must be strictly positive.
     */
    private static double roundUp(final double val) {
      int exponent = (int) Math.floor(Math.log10(val));
      double rval = val * Math.pow(10, -exponent);
      if (rval > 5.0) {
        rval = 10.0;
      } else if (rval > 2.0) {
        rval = 5.0;
      } else if (rval > 1.0) {
        rval = 2.0;
      }
      rval *= Math.pow(10, exponent);
      return rval;
    }

}








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