/// <summary>
/// Parses the view count history.
/// </summary>
/// <param name="element">The DIV element.</param>
private void ParseHtmlStatsBigChart(XElement element)
{
// Search all IMG child elements.
foreach (XElement img in element.Elements(XName.Get("img")))
{
// Get the element CLASS attribute.
XAttribute attribute = img.Attribute(XName.Get("class"));
// If the element has a CLASS attribute.
if (null != attribute)
{
switch (attribute.Value)
{
case "stats-big-chart-expanded":
this.ViewsHistory = AjaxViewsHistory.Parse(img.Attribute(XName.Get("src")).Value);
break;
}
}
}
}
/// <summary>
/// Displays the history variation for the current statistics.
/// </summary>
/// <param name="history">The views history.</param>
/// <param name="axisX">The X axis.</param>
/// <param name="axisY">The Y axis.</param>
private void DisplayHistoryVariation(AjaxViewsHistory history, string axisX, string axisY)
{
if (null == history) return;
this.chart.Series.Clear();
this.chart.Annotations.Clear();
this.listViewDiscovery.Items.Clear();
// Update the chart.
Series series = new Series("Video {0}".FormatWith(this.textBox));
series.ChartType = SeriesChartType.Line;
series.XValueType = ChartValueType.DateTime;
series.YValueType = ChartValueType.Int32;
series.Font = new Font(this.Font.FontFamily, this.Font.Size, this.Font.Style);
series.MarkerStyle = MarkerStyle.Circle;
DateTime[] time = new DateTime[history.Series.Length - 1];
double[] popularity = new double[history.Series.Length - 1];
for (int index = 1; index < history.Series.Length; index++)
{
TimeSpan dx = history.Series[index].Time - history.Series[index - 1].Time;
time[index - 1] = new DateTime((history.Series[index].Time.Ticks + history.Series[index - 1].Time.Ticks) / 2);
double dy = history.Series[index].Value - history.Series[index - 1].Value;
popularity[index - 1] = dy / dx.TotalDays;
series.Points.AddXY(time[index - 1], popularity[index - 1]);
}
this.chart.Series.Add(series);
this.chart.ChartAreas[0].AxisX.Title = axisX;
this.chart.ChartAreas[0].AxisY.Title = axisY;
AjaxHistoryMarker? lastMarker = null;
RectangleAnnotation lastAnnotation = null;
// For all markers.
foreach (AjaxHistoryMarker marker in history.Markers)
{
// Get the history point closest to the marker.
AjaxHistoryPoint? point = history.GetPointAt(marker);
// If the point does not exist, continue.
if (null == point) continue;
// Get index of the point.
int index = Array.IndexOf<AjaxHistoryPoint>(history.Series, point.Value);
// If the index is not found, skip the point.
if (-1 == index) continue;
// If the index is greater than the number of popularity points, limit the index to the size of the popularity array.
if (index >= popularity.Length) index = popularity.Length - 1;
// If the last marker and last annotation exist.
if ((lastMarker != null) && (lastAnnotation != null))
{
// If the last marker has the same date with the current one, only update the annotation text.
if (lastMarker.Value.Time == marker.Time)
{
lastAnnotation.Text += " " + marker.Name;
continue;
}
}
RectangleAnnotation rect = new RectangleAnnotation();
rect.Text = marker.Name;
rect.ForeColor = Color.Black;
rect.AxisX = this.chart.ChartAreas[0].AxisX;
rect.AxisY = this.chart.ChartAreas[0].AxisY;
rect.AnchorX = time[index].ToOADate();
rect.AnchorY = popularity[index];
rect.AnchorOffsetX = 0;
rect.AnchorOffsetY = 5;
rect.ShadowColor = Color.Gray;
rect.ShadowOffset = 5;
VerticalLineAnnotation line = new VerticalLineAnnotation();
line.AxisX = this.chart.ChartAreas[0].AxisX;
line.AxisY = this.chart.ChartAreas[0].AxisY;
line.AnchorX = time[index].ToOADate();
line.AnchorY = popularity[index];
line.Height = -5;
this.chart.Annotations.Add(line);
this.chart.Annotations.Add(rect);
this.chart.ResetAutoValues();
lastAnnotation = rect;
lastMarker = marker;
}
// Add discovery events.
foreach (KeyValuePair<string, AjaxViewsHistoryDiscoveryEvent> evt in history.DiscoveryEvents)
{
ListViewItem item = new ListViewItem(new string[] {
evt.Value.Name,
evt.Value.Marker != null ? evt.Value.Marker.Value.Time.ToString() : "Unknown",
AjaxViewsHistoryDiscoveryEvent.GetTypeDescription(evt.Value.Type),
evt.Value.Extra != null ? evt.Value.Extra : string.Empty }, 0);
item.Tag = evt.Value;
this.listViewDiscovery.Items.Add(item);
}
}
/// <summary>
/// Parses a string containing history data in Google chart format, and creates a history object.
/// </summary>
/// <param name="data">A string containing history data in Google chart format.</param>
/// <returns>A history object</returns>
public static new AjaxViewsHistory Parse(string data)
{
AjaxViewsHistory history = new AjaxViewsHistory(ChartType.Lc);
history.ParseSeries(data);
return history;
}
/// <summary>
/// Displays the history for the current statistics.
/// </summary>
/// <param name="history">The views history.</param>
/// <param name="axisX">The X axis.</param>
/// <param name="axisY">The Y axis.</param>
private void DisplayHistory(AjaxViewsHistory history, string axisX, string axisY)
{
if (null == history) return;
this.chart.Series.Clear();
this.chart.Annotations.Clear();
this.listViewDiscovery.Items.Clear();
// Update the chart.
Series series = new Series("Video {0}".FormatWith(this.textBox));
series.ChartType = SeriesChartType.Line;
series.XValueType = ChartValueType.DateTime;
series.YValueType = ChartValueType.Int32;
series.Font = new Font(this.Font.FontFamily, this.Font.Size, this.Font.Style);
series.MarkerStyle = MarkerStyle.Circle;
foreach (AjaxHistoryPoint point in history.Series)
series.Points.AddXY(point.Time, point.Value);
this.chart.Series.Add(series);
this.chart.ChartAreas[0].AxisX.Title = axisX;
this.chart.ChartAreas[0].AxisY.Title = axisY;
AjaxHistoryMarker? lastMarker = null;
RectangleAnnotation lastAnnotation = null;
// For all markers.
foreach (AjaxHistoryMarker marker in history.Markers)
{
// Get the history point closest to the marker.
AjaxHistoryPoint? point = history.GetPointAt(marker);
// If the point does not exist, continue.
if (null == point) continue;
// If the last marker and last annotation exist.
if ((lastMarker != null) && (lastAnnotation != null))
{
// If the last marker has the same date with the current one, only update the annotation text.
if (lastMarker.Value.Time == marker.Time)
{
lastAnnotation.Text += " " + marker.Name;
continue;
}
}
RectangleAnnotation rect = new RectangleAnnotation();
rect.Text = marker.Name;
rect.ForeColor = Color.Black;
rect.AxisX = this.chart.ChartAreas[0].AxisX;
rect.AxisY = this.chart.ChartAreas[0].AxisY;
rect.AnchorX = marker.Time.ToOADate();
rect.AnchorY = point.Value.Value;
rect.AnchorOffsetX = 0;
rect.AnchorOffsetY = 5;
rect.ShadowColor = Color.Gray;
rect.ShadowOffset = 5;
VerticalLineAnnotation line = new VerticalLineAnnotation();
line.AxisX = this.chart.ChartAreas[0].AxisX;
line.AxisY = this.chart.ChartAreas[0].AxisY;
line.AnchorX = marker.Time.ToOADate();
line.AnchorY = point.Value.Value;
line.Height = -5;
this.chart.Annotations.Add(line);
this.chart.Annotations.Add(rect);
this.chart.ResetAutoValues();
lastAnnotation = rect;
lastMarker = marker;
}
// Add discovery events.
foreach (KeyValuePair<string, AjaxViewsHistoryDiscoveryEvent> evt in history.DiscoveryEvents)
{
ListViewItem item = new ListViewItem(new string[] {
evt.Value.Name,
evt.Value.Marker != null ? evt.Value.Marker.Value.Time.ToString() : "Unknown",
AjaxViewsHistoryDiscoveryEvent.GetTypeDescription(evt.Value.Type),
evt.Value.Extra != null ? evt.Value.Extra : string.Empty }, 0);
item.Tag = evt.Value;
this.listViewDiscovery.Items.Add(item);
}
}
