C# DataPoint类代码示例

        // Retrieve end of day price data from yahoo finance
        public void GetData(string symbol, int period, int observations)
        {
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create("http://ichart.yahoo.com/table.csv?s=" + symbol);
            HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
            StreamReader sr = new StreamReader(resp.GetResponseStream());

            DataPointCollection logReturns = new DataPointCollection();

            int i = 0;
            string line = sr.ReadLine();// skip first line (header)
            string[] m = sr.ReadLine().Split(',');

            // The # of items we need to retrieve (make sure right amount)
            int j = period*4 + 1;
            if (j <= observations*4+1)
            {
                j = ((observations * 4) + 1);
            }

            while (i < j)
            {
                string[] n = sr.ReadLine().Split(',');
                double l = Convert.ToDouble(m[4]);
                double k = Convert.ToDouble(n[4]);
                DataPoint t = new DataPoint(Math.Log(l / k), Convert.ToDateTime(m[0]));
                logReturns.Add(t);
                m = n;
                i++;
            }

            // Calculate volatilities
            double annualFactor = Math.Sqrt(252);
            for (i = 0; i < j / 2; ++i)
            {
                double vol = StandardDeviation(logReturns.GetRange(i, period)) * annualFactor;
                DataPoint t = new DataPoint(vol, logReturns[i].Date);
                _vols.Add(t);
            }

            // Calculate std-dev of all volatilities
            for(i = 0; i < observations; ++i)
            {
                double stdDev = StandardDeviation(_vols.GetRange(i, period));
                DataPoint t = new DataPoint(stdDev, _vols[i].Date);
                _volStdDev.Add(t);
            }

            // Take subset so we can plot on graph
            _vols = _vols.GetRange(0, observations);
        }

 public void PointsTest(int i, double x, double y)
 {
     var s = GetSpectrum();
     var expected = new DataPoint(i, x, y);
     var actual = s.Points.ToArray()[i];
     Assert.AreEqual(expected, actual);
 }

        public static void CreateChart(string imagePath,string name, IEnumerable<BenchResult> results, Func<BenchResult,double> selector)
        {
            Chart chart = new Chart();
            chart.Width = 500;
            chart.Height = 400;
            chart.Titles.Add(name);
            var area = new ChartArea("Default");
            chart.ChartAreas.Add(area);
            var series = new Series("Default");
            chart.Series.Add(series);
            area.AxisX.LabelAutoFitStyle = LabelAutoFitStyles.LabelsAngleStep90;
            area.AxisX.LabelStyle.TruncatedLabels = false;
            area.AxisX.Interval = 1;
            series.ChartType = SeriesChartType.Column;
            series.IsValueShownAsLabel = true;
            series.XValueType = ChartValueType.String;

            series.YValueType = ChartValueType.Int32;

            foreach(var r in results.OrderBy( r => selector(r)))
            {
                DataPoint point = new DataPoint();
                point.SetValueXY(r.Serializer.Replace("Adapter",""),(int)Math.Round(selector(r)));
                point.AxisLabel = r.Serializer.Replace("Adapter", "");
                series.Points.Add(point);
            }

            chart.SaveImage(imagePath, ChartImageFormat.Png);
        }

        protected void uxGamesRepeater_ItemDataBound(object sender, RepeaterItemEventArgs e)
        {
            UserMeanGameScore mgs = (UserMeanGameScore)e.Item.DataItem;
            //e.Item.FindControl("uxIndividualCharge");

            if (Session["SessionId"] != null)
            {
                Guid sessionId = new Guid(Session["SessionId"].ToString());
                GamesScoreWS.GameScoreService gsClient = new GamesScoreWS.GameScoreService();
                IndividualGameResults igResults = gsClient.FetchIndividualGames(sessionId, mgs.GameId);
                if (igResults.Success)
                {
                    Chart createChart = (Chart)e.Item.FindControl("uxIndividualCharge");
                    createChart.Titles.Add(mgs.Game);
                    Series resultsSeries = createChart.Series["GameScores"];
                    foreach (t_GameResults gr in igResults.GameResultList)
                    {
                        DataPoint dp = new DataPoint();
                        decimal indexical = ((decimal)gr.Score / (decimal)gr.Total) * 100;
                        dp.SetValueXY(gr.Created.ToShortDateString(), indexical);
                        dp.ToolTip = string.Format("{0} out of {1} in {2} seconds", gr.Score, gr.Total, gr.TestDuration);
                        resultsSeries.Points.Add(dp);
                    }
                }
            }
        }

        protected override void Add(DataPoint<decimal> dataPoint)
        {
            //TimeSeriesLock.EnterWriteLock();
            try
            {
                TimeSeries.Add(dataPoint);
            }
            finally
            {
               // TimeSeriesLock.ExitWriteLock();
            }

            OnNewDataPoint(dataPoint);

            bool haveToProcess = false;
            //TimeSeriesLock.EnterReadLock();
            try
            {
                haveToProcess = TimeSeries.Count >= _period;
            }
            finally
            {
                //TimeSeriesLock.ExitReadLock();
            }
            // not ideal, value can still change, but it is acceptable for the stats
            if (haveToProcess)
                ProcessNewValue();
        }

        private int GetPaletteEntryIndex(DataPoint dp)
        {
            var series = (ChartSeries)dp.Presenter;
            var cartesianChart = series.Chart as RadCartesianChart;
            var pieChart = series.Chart as RadPieChart;
            int index;

            if (cartesianChart != null)
            {
                BarSeries barSeries = series as BarSeries;
                BubbleSeries bubbleSeries = series as BubbleSeries;
                if ((barSeries != null && barSeries.PaletteMode == SeriesPaletteMode.DataPoint) ||
                    (bubbleSeries != null && bubbleSeries.PaletteMode == SeriesPaletteMode.DataPoint))
                {
                    index = dp.Index;
                }
                else
                {
                    index = cartesianChart.Series.IndexOf((CartesianSeries)series);
                }
            }
            else if (pieChart != null)
            {
                index = pieChart.Series.IndexOf((PieSeries)series);
            }
            else
            {
                index = ((RadPolarChart)series.Chart).Series.IndexOf((PolarSeries)series);
            }

            return index;
        }

        public static double Slope(DataPoint[] points)
        {
            double xAvg = 0, yAvg = 0;

            for (int i = 0; i < points.Length; i++)
            {
                xAvg += points[i].temperature;
                yAvg += points[i].position;
            }

            xAvg = xAvg / points.Length;
            yAvg = yAvg / points.Length;

            double v1 = 0;
            double v2 = 0;

            for (int i = 0; i < points.Length; i++)
            {
                v1 += (points[i].temperature - xAvg) * (points[i].position - yAvg);
                v2 += Math.Pow(points[i].temperature - xAvg, 2);
            }

            double a = v1 / v2;

            return a;
        }

        public async void RestClient_posts_metrics()
        {
            var metricName = GetUniqueMetricName();

            var dataPoint = new DataPoint(DateTime.UtcNow.MillisecondsSinceEpoch(), 5L);

            var metric = new Metric(metricName)
                .AddTag("route_id", "1")
                .AddDataPoint(dataPoint);

            await _client.AddMetricsAsync(new[] {metric});

            var query = new QueryBuilder()
                .SetStart(TimeSpan.FromSeconds(5))
                .AddQueryMetric(new QueryMetric(metricName));

            Thread.Sleep(TimeSpan.FromSeconds(2));

            var response = await _client.QueryMetricsAsync(query);

            response.Queries.Should().HaveCount(1);
            response.Queries[0].SampleSize.Should().Be(1);
            response.Queries[0].Results.Should().HaveCount(1);
            response.Queries[0].Results[0].DataPoints.Single().ShouldBeEquivalentTo(dataPoint);
        }

        public async void QueryMetricsAsync_uses_sum_aggregator()
        {
            var metricName = GetUniqueMetricName();

            var time = DateTime.UtcNow.MillisecondsSinceEpoch();

            var dataPoint = new DataPoint(time, 10L);
            var dataPoint2 = new DataPoint(time + 1, 30L);

            var metric = new Metric(metricName)
                .AddTag("route_id", "1")
                .AddDataPoint(dataPoint2)
                .AddDataPoint(dataPoint);

            await _client.AddMetricsAsync(new[] { metric });

            var queryMetric = new QueryMetric(metricName)
                .AddAggregator(new SumAggregator(1, TimeUnit.Minutes));

            var query = new QueryBuilder()
                .SetStart(TimeSpan.FromSeconds(10))
                .AddQueryMetric(queryMetric);

            Thread.Sleep(TimeSpan.FromSeconds(2));

            var response = await _client.QueryMetricsAsync(query);

            response.Queries.Should().HaveCount(1);
            response.Queries[0].Results.Should().HaveCount(1);
            response.Queries[0].Results[0].DataPoints.Single().Value.Should().Be(40L);
        }

        // Override the AddChartSeries method to provide the chart data
        protected override void AddChartSeries()
        {
            ChartSeriesData = new List<Series>();
            var series = new Series()
            {
                ChartType = SeriesChartType.Pie,
                BorderWidth = 1
            };

            var shares = chartData.ShareData;
            foreach (var share in shares)
            {
                var point = new DataPoint();
                point.IsValueShownAsLabel = true;
                point.AxisLabel = share.Name;
                point.ToolTip = share.Name + " " +
                      share.Share.ToString("#0.##%");
                if (share.Url != null)
                {
                    point.MapAreaAttributes = "href=\"" +
                          share.Url + "\"";
                }
                point.YValues = new double[] { share.Share };
                point.LabelFormat = "P1";
                series.Points.Add(point);
            }

            ChartSeriesData.Add(series);
        }

        public void ValidMessage_ProducesValidJson()
        {
            var name = "foo";
            var value = 1923;
            var instance = "i-349da92";
            var collectedAt = new DateTime(2012, 1, 2);
            var collectedAtEpochSeconds = (long) collectedAt.Subtract(CustomMetricsMessage.EpochTime).TotalSeconds;
            var dp = new DataPoint(name, value, collectedAt, instance);

            var now = DateTime.UtcNow;
            var msg = new CustomMetricsMessage(dp);

            var json = msg.ToJson();
            Assert.NotNull(json);

            var deserialized = (JObject)JsonConvert.DeserializeObject(json);
            Assert.Equal(CustomMetricsMessage.ProtocolVersion, deserialized["proto_version"].Value<int>());
            Assert.True(deserialized["timestamp"].Value<long>() >= CustomMetricsMessage.EpochTime.Subtract(now).TotalSeconds);

            var pointsArray = deserialized["data"].Value<JArray>();
            Assert.NotNull(pointsArray);
            Assert.Equal(1, pointsArray.Count);

            var data0 = (JObject)pointsArray[0];
            Assert.Equal(name, data0["name"].Value<string>());
            Assert.Equal(value, data0["value"].Value<int>());
            Assert.Equal(instance, data0["instance"].Value<string>());
            Assert.Equal(collectedAtEpochSeconds, data0["collected_at"].Value<long>());
        }

    public void BindProductSalesChart(int year)
    {
        using (CartDataClassesDataContext context = new CartDataClassesDataContext())
        {
            var productSales = from o in context.Orders
                               where o.DatePlaced.Value.Year == year
                               group o by o.DatePlaced.Value.Month into g
                               orderby g.Key
                               select new
                               {
                                   Month = g,
                                   TopProducts = (from op in context.OrderProducts
                                                  where op.OrderDate.Value.Year == year && op.OrderDate.Value.Month == g.Key
                                                  group op by op.ProductID into opg
                                                  orderby opg.Count() descending
                                                  select new { ProductName = context.Products.Where(p => p.ProductID == opg.Key).Single().ProductName, ProductCount = opg.Count() }).Take(5)
                               };

            foreach (var sale in productSales)
            {
                Series series = new Series(Enum.Parse(typeof(Month), sale.Month.FirstOrDefault().DatePlaced.Value.Month.ToString()).ToString()) { ChartType = SeriesChartType.Bubble};
                foreach (var topProduct in sale.TopProducts){
                    DataPoint point = new DataPoint() { XValue = sale.Month.Key, YValues = new double[] { (double)topProduct.ProductCount }, Label = topProduct.ProductName };
                    series.Points.Add(point);

                }
                ProductSalesChart.Series.Add(series);
            }
        }
    }

 public static DataPoint operator +(DataPoint d1, DataPoint d2)
 {
     DataPoint temp = new DataPoint();
     temp.Commits = d1.Commits + d2.Commits;
     temp.AddedLines = d1.AddedLines + d2.AddedLines;
     temp.DeletedLines = d1.DeletedLines + d2.DeletedLines;
     return temp;
 }

 public void addPoint(DataPoint point)
 {
     lock (this.theLock)
     {
         points.Add(point);
         dataPoints.Add(point.AsDataObject());
     }
 }

 public DataVector(DataPoint pt1, DataPoint pt2)
 {
     xDiff = pt2.X - pt1.X;
     yDiff = pt2.Y - pt1.Y;
     if (xDiff != 0 || yDiff != 0)
     {
         isZero = false;
     }
 }