Util.java

/*
 * Copyright (C) 2011 Google Inc.
 * 
 * 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 tgnourse.diveguide;

import java.text.DecimalFormat;

import android.util.Log;

/**
 * @author tgnourse@google.com (Thomas Nourse)
 */
public class Util {

	public static final float FEET_PER_METER = (float) 3.2808399;
	private static final String LOG_IDENTIFIER = "DiveGuide";
	
	/**
	 * Print a info message to the logs.
	 * @param message The message to be printed
	 */
	public static void log(String message) {
		Log.i(LOG_IDENTIFIER, message);
	}

	/**
	 * Print an error message to the logs.
	 * @param message The message to be printed
	 */
	public static void error(String message) {
		Log.e(LOG_IDENTIFIER, message);
	}

	public static String getDirectionFromHeading(int heading) {		
		if (heading >=0 && heading < 90)
			return getDirectionFromQuadrant(heading, "N", "E");
		if (heading >=90 && heading < 180)
			return getDirectionFromQuadrant(heading - 90, "E", "S");
		if (heading >=180 && heading < 270)
			return getDirectionFromQuadrant(heading - 180, "S", "W");
		if (heading >=270 && heading < 360)
			return getDirectionFromQuadrant(heading - 270, "W", "N");
		return "XX";
	}
	
	private static String getDirectionFromQuadrant(int heading, String first, String second) {
		if (heading >= 0 && heading < 10) return first;
		if (heading >= 10 && heading < 35) return first + "-" + first + second;
		if (heading >= 35 && heading < 55) return first + second;
		if (heading >= 55 && heading < 80) return second + "-" + first + second;
		if (heading >= 80 && heading < 90) return second;
		
		return "XX";
	}

	public static String getUnitForDistance(double distance) {		
		if (distance < 300) return "ft";
		if (distance < 440 * 3) return " yards";
		return " miles";
	}
	
	public static String getHumanReadableDistance(double distance) {
		if (distance < 300) return String.valueOf(Math.round(distance));
		if (distance < 440 * 3) return String.valueOf(Math.round(distance / 3));
		
		DecimalFormat format = new DecimalFormat("#.##");
		return String.valueOf(Double.valueOf(format.format(distance / 5280)));
	}

	public static String getUnitForDuration(long millis) {
		long seconds = millis / 1000;
		if (seconds < 120) return " seconds old";
		return " min old"; 
	}
	
	public static String getHumanReadableDuration(long millis) {
		long seconds = millis / 1000;
		if (seconds < 120) return String.valueOf(seconds);
		return String.valueOf(seconds / 60); 
	}
}