optionstrack.java

GPS Track connects to a GPS and records the path that you travel. Tracks can be uploaded to a web s

// J2ME GPS Track
// Copyright (C) 2006 Dana Peters
// http://www.qcontinuum.org/gpstrack

package org.qcontinuum.gpstrack;

import javax.microedition.lcdui.*;

public class OptionsTrack extends Form implements CommandListener {

    private Displayable mParent;
    private Command mCancelCommand, mOkCommand;
    private ChoiceGroup mDistanceChoiceGroup, mTimeChoiceGroup;

    private static final String mDistanceMetricStrings[] = {
        "No Minimum",
        "10 m",
        "20 m",
        "50 m",
        "100 m",
        "200 m",
        "500 m",
        "1 km"
    };
    private static final int mDistanceMetricValues[] = { 0, 10, 20, 50, 100, 200, 500, 1000 };

    private static final String mDistanceUSStrings[] = {
        "No Minimum",
        "30 feet",
        "100 feet",
        "200 feet",
        "500 feet",
        "1000 feet",
        "0.25 mile",
        "0.5 mile"
    };
    private static final int mDistanceUSValues[] = { 0, 9, 30, 61, 152, 305, 402, 805 };

    private static final String mTimeStrings[] = {
        "2 sec",
        "10 sec",
        "20 sec",
        "30 sec",
        "1 min",
        "2 min"
    };
    private static final int mTimeValues[] = { 2, 10, 20, 30, 60, 120 };

    public OptionsTrack(Displayable parent) {
        super("Track Options");
        mParent = parent;
        Preferences preferences = GpsTrack.getPreferences();
        int minDistance = preferences.getMinDistance();
        switch (preferences.getUnitType()) {
            case Preferences.UNITTYPE_METRIC:
                mDistanceChoiceGroup = new ChoiceGroup("Minimum Distance", List.EXCLUSIVE, mDistanceMetricStrings, null);
                mDistanceChoiceGroup.setSelectedIndex(findClosestValue(mDistanceMetricValues, minDistance), true);
                break;
            case Preferences.UNITTYPE_US:
                mDistanceChoiceGroup = new ChoiceGroup("Minimum Distance", List.EXCLUSIVE, mDistanceUSStrings, null);
                mDistanceChoiceGroup.setSelectedIndex(findClosestValue(mDistanceUSValues, minDistance), true);
                break;
        }
        int minTime = preferences.getMinTime();
        mTimeChoiceGroup = new ChoiceGroup("Minimum Time", List.EXCLUSIVE, mTimeStrings, null);
        mTimeChoiceGroup.setSelectedIndex(findClosestValue(mTimeValues, minTime), true);
        mCancelCommand = new Command("Cancel", Command.EXIT, 1);
        mOkCommand = new Command("OK", Command.OK, 1);
        append(mDistanceChoiceGroup);
        append(mTimeChoiceGroup);
        addCommand(mCancelCommand);
        addCommand(mOkCommand);
        setCommandListener(this);
    }
    
    public void commandAction(Command c, Displayable d)  {
        if (c == mOkCommand) {
            Preferences preferences = GpsTrack.getPreferences();
            switch (preferences.getUnitType()) {
                case Preferences.UNITTYPE_METRIC:
                    preferences.setMinDistance(mDistanceMetricValues[mDistanceChoiceGroup.getSelectedIndex()]);
                    break;
                case Preferences.UNITTYPE_US:
                    preferences.setMinDistance(mDistanceUSValues[mDistanceChoiceGroup.getSelectedIndex()]);
                    break;
            }
            preferences.setMinTime(mTimeValues[mTimeChoiceGroup.getSelectedIndex()]);
            preferences.save();
            GpsTrack.display(mParent);
        } else if (c == mCancelCommand) {
            GpsTrack.display(mParent);
        }
    }
    
    private int findClosestValue(int [] values, int value) {
        int index, minIndex = -1, minDelta = -1;
        for (index = 0; index < values.length; index++) {
            int delta = Math.abs(values[index] - value);
            if (minDelta > delta || minDelta < 0) {
                minIndex = index;
                minDelta = delta;
            }
        }
        return minIndex;
    }
}