Android Open Source - openxcKPL Historical Chart Fragment

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License

The source code is released under:

Copyright (c) 2012 Ford Motor Company All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are me...

Java Source Code

package com.ford.openxc.kpl;
/*  w  w w. j a va2  s  .co  m*/
import org.achartengine.ChartFactory;
import org.achartengine.GraphicalView;
import org.achartengine.chart.BarChart.Type;
import org.achartengine.model.TimeSeries;
import org.achartengine.model.XYSeries;
import org.achartengine.renderer.XYMultipleSeriesRenderer;
import org.achartengine.renderer.XYSeriesRenderer;
import org.joda.time.DateMidnight;

import android.database.Cursor;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.view.ViewGroup;

public class HistoricalChartFragment extends ChartFragment {
    private static final String TAG = "HistoricalChartFragment";
    private final static String pattern = "YYYY-MM-dd";

    private DbHelper mDatabase;
    private Timeframe mTimeframe = Timeframe.PER_TRIP;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        mDatabase = new DbHelper(getActivity());
        super.onCreate(savedInstanceState);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        mDatabase.close();
    }

    @Override
    protected GraphicalView getChartView() {
        return ChartFactory.getBarChartView(getActivity(), getDataset(),
                mRenderer, Type.DEFAULT);
    }

    @Override
    protected void initGraph(XYMultipleSeriesRenderer renderer) {
        XYSeries series = getSeries();
        renderer.setShowLegend(false);
        renderer.setApplyBackgroundColor(true);
        renderer.setBackgroundColor(Color.argb(1000, 50, 50, 50));
        renderer.setYTitle(series.getTitle());
        renderer.setLabelsTextSize(25);
        renderer.setShowGrid(true);
        renderer.setBarSpacing(0.05);
        renderer.setAntialiasing(true);
        renderer.setMargins(getMargins());
        setAxis(renderer);

        XYSeriesRenderer srend = new XYSeriesRenderer();
        srend.setColor(getLineColor());
        renderer.addSeriesRenderer(srend);
    }

    @Override
    protected int[] getMargins() {
        return new int[] { 35, 60, 10, 10 };
    }

    protected Timeframe getTimeframe() {
        return mTimeframe;
    }

    protected void setTimeframe(Timeframe newTimeframe) {
        Log.d(TAG, "Changing timeframe to " + newTimeframe);
        mTimeframe = newTimeframe;
        repaint();
    }

    private void repaint() {
        // TODO  Assuming one series per graph.
        XYSeriesRenderer seriesRenderer = (XYSeriesRenderer)
            mRenderer.getSeriesRendererAt(0);
        seriesRenderer.setColor(getLineColor());

        ViewGroup parent = (ViewGroup) mChartView.getParent();
        parent.removeView(mChartView);

        setAxis(mRenderer);
        mChartView = getChartView();
        parent.addView(mChartView);
    }

    protected void setAxis(XYMultipleSeriesRenderer renderer) {
        XYSeries series = getSeries();
        renderer.setYAxisMin(0);
        renderer.setYAxisMax(series.getMaxY()+(series.getMaxY()*.05));
        renderer.setXAxisMin(Math.max(0, series.getMinX() - 3));
        renderer.setXAxisMax(series.getMaxX() + 1);
    }

    protected TimeSeries getSeries(String column, String dataName,
            boolean average) {
        TimeSeries series = new TimeSeries(dataName);
        final int bars = 12;

        mRenderer.clearXTextLabels();
        Timeframe timeframe = getTimeframe();
        if (timeframe == Timeframe.DAILY) {
            DateMidnight endDate = (new DateMidnight()).plusDays(1);
            DateMidnight startDate = endDate.minusDays(2);

            for (int i = 0; i < bars; i++) {
                double total = 0;
                Cursor data = mDatabase.getLastData(startDate.toString(pattern),
                        endDate.toString(pattern), column);
                total = calculateData(data, average);

                startDate = startDate.plusDays(1);
                series.add(startDate.getDayOfMonth(), total);
                mRenderer.addXTextLabel(startDate.getDayOfMonth(),
                        startDate.toString("d"));
                mRenderer.setXTitle("Day in " + startDate.toString("MMMM"));

                endDate = endDate.minusDays(1);
                startDate = startDate.minusDays(2);
            }
        } else if (timeframe == Timeframe.WEEKLY) {
            DateMidnight endDate = new DateMidnight().plusDays(1);
            DateMidnight startDate = endDate.minusDays(8);

            for (int i=0; i < bars; i++) {
                double total = 0;
                Cursor data = mDatabase.getLastData(startDate.toString(pattern),
                        endDate.toString(pattern), column);
                total = calculateData(data, average);

                startDate.plusDays(1);
                series.add(startDate.getWeekOfWeekyear(), total);
                mRenderer.addXTextLabel(startDate.getWeekOfWeekyear(),
                        startDate.toString("w"));
                mRenderer.setXTitle("Week of Year");

                endDate = endDate.minusDays(7);
                startDate = startDate.minusDays(7);
            }
        } else if (timeframe == Timeframe.MONTHLY) {
            DateMidnight endDate = new DateMidnight().plusMonths(1);
            DateMidnight startDate = endDate.minusMonths(2);

            for (int i=0; i < bars; i++) {
                double total = 0;
                Cursor data = mDatabase.getLastData(startDate.toString(pattern),
                        endDate.toString(pattern), column);
                total = calculateData(data, average);

                startDate = startDate.plusMonths(1);
                series.add(startDate.getMonthOfYear(), total);
                mRenderer.addXTextLabel(startDate.getMonthOfYear(),
                        startDate.toString("M"));
                mRenderer.setXTitle("Month");

                endDate = endDate.minusMonths(1);
                startDate = startDate.minusMonths(2);
            }
        } else if (timeframe == Timeframe.PER_TRIP) {
            Cursor data = mDatabase.getLastData(bars, column);
            if(data.moveToLast()) {
                for (int i = data.getCount() - 1; i > 0; i--) {
                    series.add(i, data.getDouble(0));
                    mRenderer.addXTextLabel(i, "" + i);
                    data.moveToPrevious();
                }
                mRenderer.setXTitle("Trip Number");
                data.close();
            }
        } else {
            Log.w(TAG, "Unknown timeframe: " + timeframe);
        }
        return series;
    }

    private double calculateData(Cursor data, boolean average) {
        double total = 0;
        if(data.moveToFirst()) {
            for (int x=0; x < data.getCount(); x++) {
                double fuel = data.getDouble(0);
                if (average) {
                    double tempAvg = total;
                    double tempTotal = tempAvg * x;
                    tempTotal += fuel;
                    tempAvg = tempTotal/(x+1);
                    total = tempAvg;
                } else {
                    total += fuel;
                }
                data.moveToNext();
            }
            data.close();
        }
        return total;
    }
}

Java Source Code List

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