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source: branches/OaaS/HeuristicLab.Analysis.Views/3.3/DataTableView.cs @ 12448

Last change on this file since 12448 was 9363, checked in by spimming, 12 years ago

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1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2012 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using HeuristicLab.Collections;
23using HeuristicLab.Core.Views;
24using HeuristicLab.MainForm;
25using System;
26using System.Collections.Generic;
27using System.Drawing;
28using System.Linq;
29using System.Windows.Forms;
30using System.Windows.Forms.DataVisualization.Charting;
31
32namespace HeuristicLab.Analysis.Views {
33  [View("DataTable View")]
34  [Content(typeof(DataTable), true)]
35  public partial class DataTableView : NamedItemView, IConfigureableView {
36    protected List<Series> invisibleSeries;
37    protected Dictionary<IObservableList<double>, DataRow> valuesRowsTable;
38
39    public new DataTable Content {
40      get { return (DataTable)base.Content; }
41      set { base.Content = value; }
42    }
43
44    public DataTableView() {
45      InitializeComponent();
46      valuesRowsTable = new Dictionary<IObservableList<double>, DataRow>();
47      invisibleSeries = new List<Series>();
48      chart.CustomizeAllChartAreas();
49      chart.ChartAreas[0].CursorX.Interval = 1;
50    }
51
52    #region Event Handler Registration
53    protected override void DeregisterContentEvents() {
54      foreach (DataRow row in Content.Rows)
55        DeregisterDataRowEvents(row);
56      Content.VisualPropertiesChanged -= new EventHandler(Content_VisualPropertiesChanged);
57      Content.Rows.ItemsAdded -= new CollectionItemsChangedEventHandler<DataRow>(Rows_ItemsAdded);
58      Content.Rows.ItemsRemoved -= new CollectionItemsChangedEventHandler<DataRow>(Rows_ItemsRemoved);
59      Content.Rows.ItemsReplaced -= new CollectionItemsChangedEventHandler<DataRow>(Rows_ItemsReplaced);
60      Content.Rows.CollectionReset -= new CollectionItemsChangedEventHandler<DataRow>(Rows_CollectionReset);
61      base.DeregisterContentEvents();
62    }
63    protected override void RegisterContentEvents() {
64      base.RegisterContentEvents();
65      Content.VisualPropertiesChanged += new EventHandler(Content_VisualPropertiesChanged);
66      Content.Rows.ItemsAdded += new CollectionItemsChangedEventHandler<DataRow>(Rows_ItemsAdded);
67      Content.Rows.ItemsRemoved += new CollectionItemsChangedEventHandler<DataRow>(Rows_ItemsRemoved);
68      Content.Rows.ItemsReplaced += new CollectionItemsChangedEventHandler<DataRow>(Rows_ItemsReplaced);
69      Content.Rows.CollectionReset += new CollectionItemsChangedEventHandler<DataRow>(Rows_CollectionReset);
70    }
71
72    protected virtual void RegisterDataRowEvents(DataRow row) {
73      row.NameChanged += new EventHandler(Row_NameChanged);
74      row.VisualPropertiesChanged += new EventHandler(Row_VisualPropertiesChanged);
75      valuesRowsTable.Add(row.Values, row);
76      row.Values.ItemsAdded += new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_ItemsAdded);
77      row.Values.ItemsRemoved += new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_ItemsRemoved);
78      row.Values.ItemsReplaced += new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_ItemsReplaced);
79      row.Values.ItemsMoved += new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_ItemsMoved);
80      row.Values.CollectionReset += new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_CollectionReset);
81    }
82    protected virtual void DeregisterDataRowEvents(DataRow row) {
83      row.Values.ItemsAdded -= new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_ItemsAdded);
84      row.Values.ItemsRemoved -= new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_ItemsRemoved);
85      row.Values.ItemsReplaced -= new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_ItemsReplaced);
86      row.Values.ItemsMoved -= new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_ItemsMoved);
87      row.Values.CollectionReset -= new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_CollectionReset);
88      valuesRowsTable.Remove(row.Values);
89      row.VisualPropertiesChanged -= new EventHandler(Row_VisualPropertiesChanged);
90      row.NameChanged -= new EventHandler(Row_NameChanged);
91    }
92    #endregion
93
94    protected override void OnContentChanged() {
95      base.OnContentChanged();
96      invisibleSeries.Clear();
97      chart.Titles[0].Text = string.Empty;
98      chart.ChartAreas[0].AxisX.Title = string.Empty;
99      chart.ChartAreas[0].AxisY.Title = string.Empty;
100      chart.ChartAreas[0].AxisY2.Title = string.Empty;
101      chart.Series.Clear();
102      if (Content != null) {
103        chart.Titles[0].Text = Content.Name;
104        AddDataRows(Content.Rows);
105        ConfigureChartArea(chart.ChartAreas[0]);
106        RecalculateAxesScale(chart.ChartAreas[0]);
107      }
108    }
109
110    protected override void SetEnabledStateOfControls() {
111      base.SetEnabledStateOfControls();
112      chart.Enabled = Content != null;
113    }
114
115    public void ShowConfiguration() {
116      if (Content != null) {
117        using (var dialog = new DataTableVisualPropertiesDialog(Content)) {
118          dialog.ShowDialog(this);
119        }
120      } else MessageBox.Show("Nothing to configure.");
121    }
122    protected virtual void AddDataRows(IEnumerable<DataRow> rows) {
123      foreach (var row in rows) {
124        RegisterDataRowEvents(row);
125        var series = new Series(row.Name);
126        if (row.VisualProperties.DisplayName.Trim() != String.Empty) series.LegendText = row.VisualProperties.DisplayName;
127        else series.LegendText = row.Name;
128        ConfigureSeries(series, row);
129        FillSeriesWithRowValues(series, row);
130        chart.Series.Add(series);
131      }
132      ConfigureChartArea(chart.ChartAreas[0]);
133      RecalculateAxesScale(chart.ChartAreas[0]);
134      UpdateYCursorInterval();
135    }
136
137    protected virtual void RemoveDataRows(IEnumerable<DataRow> rows) {
138      foreach (var row in rows) {
139        DeregisterDataRowEvents(row);
140        Series series = chart.Series[row.Name];
141        chart.Series.Remove(series);
142        if (invisibleSeries.Contains(series))
143          invisibleSeries.Remove(series);
144      }
145      RecalculateAxesScale(chart.ChartAreas[0]);
146    }
147
148    private void ConfigureSeries(Series series, DataRow row) {
149      RemoveCustomPropertyIfExists(series, "PointWidth");
150      series.BorderWidth = 1;
151      series.BorderDashStyle = ChartDashStyle.Solid;
152      series.BorderColor = Color.Empty;
153
154      if (row.VisualProperties.Color != Color.Empty)
155        series.Color = row.VisualProperties.Color;
156      else series.Color = Color.Empty;
157      series.IsVisibleInLegend = row.VisualProperties.IsVisibleInLegend;
158
159      switch (row.VisualProperties.ChartType) {
160        case DataRowVisualProperties.DataRowChartType.Line:
161          series.ChartType = SeriesChartType.FastLine;
162          series.BorderWidth = row.VisualProperties.LineWidth;
163          series.BorderDashStyle = ConvertLineStyle(row.VisualProperties.LineStyle);
164          break;
165        case DataRowVisualProperties.DataRowChartType.Bars:
166          // Bar is incompatible with anything but Bar and StackedBar*
167          if (!chart.Series.Any(x => x.ChartType != SeriesChartType.Bar && x.ChartType != SeriesChartType.StackedBar && x.ChartType != SeriesChartType.StackedBar100))
168            series.ChartType = SeriesChartType.Bar;
169          else {
170            series.ChartType = SeriesChartType.FastPoint; //default
171            row.VisualProperties.ChartType = DataRowVisualProperties.DataRowChartType.Points;
172          }
173          break;
174        case DataRowVisualProperties.DataRowChartType.Columns:
175          series.ChartType = SeriesChartType.Column;
176          break;
177        case DataRowVisualProperties.DataRowChartType.Points:
178          series.ChartType = SeriesChartType.FastPoint;
179          break;
180        case DataRowVisualProperties.DataRowChartType.Histogram:
181          series.ChartType = SeriesChartType.Column;
182          series.SetCustomProperty("PointWidth", "1");
183          if (!series.Color.IsEmpty && series.Color.GetBrightness() < 0.25)
184            series.BorderColor = Color.White;
185          else series.BorderColor = Color.Black;
186          break;
187        case DataRowVisualProperties.DataRowChartType.StepLine:
188          series.ChartType = SeriesChartType.StepLine;
189          series.BorderWidth = row.VisualProperties.LineWidth;
190          series.BorderDashStyle = ConvertLineStyle(row.VisualProperties.LineStyle);
191          break;
192        default:
193          series.ChartType = SeriesChartType.FastPoint;
194          break;
195      }
196      series.YAxisType = row.VisualProperties.SecondYAxis ? AxisType.Secondary : AxisType.Primary;
197      series.XAxisType = row.VisualProperties.SecondXAxis ? AxisType.Secondary : AxisType.Primary;
198      if (row.VisualProperties.DisplayName.Trim() != String.Empty) series.LegendText = row.VisualProperties.DisplayName;
199      else series.LegendText = row.Name;
200
201      string xAxisTitle = string.IsNullOrEmpty(Content.VisualProperties.XAxisTitle)
202                      ? "X"
203                      : Content.VisualProperties.XAxisTitle;
204      string yAxisTitle = string.IsNullOrEmpty(Content.VisualProperties.YAxisTitle)
205                            ? "Y"
206                            : Content.VisualProperties.YAxisTitle;
207      series.ToolTip =
208        series.LegendText + Environment.NewLine +
209        xAxisTitle + " = " + "#INDEX," + Environment.NewLine +
210        yAxisTitle + " = " + "#VAL";
211    }
212
213    private void ConfigureChartArea(ChartArea area) {
214      if (Content.VisualProperties.TitleFont != null) chart.Titles[0].Font = Content.VisualProperties.TitleFont;
215      if (!Content.VisualProperties.TitleColor.IsEmpty) chart.Titles[0].ForeColor = Content.VisualProperties.TitleColor;
216      chart.Titles[0].Text = Content.VisualProperties.Title;
217
218      if (Content.VisualProperties.AxisTitleFont != null) area.AxisX.TitleFont = Content.VisualProperties.AxisTitleFont;
219      if (!Content.VisualProperties.AxisTitleColor.IsEmpty) area.AxisX.TitleForeColor = Content.VisualProperties.AxisTitleColor;
220      area.AxisX.Title = Content.VisualProperties.XAxisTitle;
221
222      if (Content.VisualProperties.AxisTitleFont != null) area.AxisX2.TitleFont = Content.VisualProperties.AxisTitleFont;
223      if (!Content.VisualProperties.AxisTitleColor.IsEmpty) area.AxisX2.TitleForeColor = Content.VisualProperties.AxisTitleColor;
224      area.AxisX2.Title = Content.VisualProperties.SecondXAxisTitle;
225
226      if (Content.VisualProperties.AxisTitleFont != null) area.AxisY.TitleFont = Content.VisualProperties.AxisTitleFont;
227      if (!Content.VisualProperties.AxisTitleColor.IsEmpty) area.AxisY.TitleForeColor = Content.VisualProperties.AxisTitleColor;
228      area.AxisY.Title = Content.VisualProperties.YAxisTitle;
229
230      if (Content.VisualProperties.AxisTitleFont != null) area.AxisY2.TitleFont = Content.VisualProperties.AxisTitleFont;
231      if (!Content.VisualProperties.AxisTitleColor.IsEmpty) area.AxisY2.TitleForeColor = Content.VisualProperties.AxisTitleColor;
232      area.AxisY2.Title = Content.VisualProperties.SecondYAxisTitle;
233
234      area.AxisX.IsLogarithmic = Content.VisualProperties.XAxisLogScale;
235      area.AxisX2.IsLogarithmic = Content.VisualProperties.SecondXAxisLogScale;
236      area.AxisY.IsLogarithmic = Content.VisualProperties.YAxisLogScale;
237      area.AxisY2.IsLogarithmic = Content.VisualProperties.SecondYAxisLogScale;
238    }
239
240    private void RecalculateAxesScale(ChartArea area) {
241      // Reset the axes bounds so that RecalculateAxesScale() will assign new bounds
242      foreach (Axis a in area.Axes) {
243        a.Minimum = double.NaN;
244        a.Maximum = double.NaN;
245      }
246      area.RecalculateAxesScale();
247      area.AxisX.IsMarginVisible = false;
248      area.AxisX2.IsMarginVisible = false;
249
250      if (!Content.VisualProperties.XAxisMinimumAuto && !double.IsNaN(Content.VisualProperties.XAxisMinimumFixedValue)) area.AxisX.Minimum = Content.VisualProperties.XAxisMinimumFixedValue;
251      if (!Content.VisualProperties.XAxisMaximumAuto && !double.IsNaN(Content.VisualProperties.XAxisMaximumFixedValue)) area.AxisX.Maximum = Content.VisualProperties.XAxisMaximumFixedValue;
252      if (!Content.VisualProperties.SecondXAxisMinimumAuto && !double.IsNaN(Content.VisualProperties.SecondXAxisMinimumFixedValue)) area.AxisX2.Minimum = Content.VisualProperties.SecondXAxisMinimumFixedValue;
253      if (!Content.VisualProperties.SecondXAxisMaximumAuto && !double.IsNaN(Content.VisualProperties.SecondXAxisMaximumFixedValue)) area.AxisX2.Maximum = Content.VisualProperties.SecondXAxisMaximumFixedValue;
254      if (!Content.VisualProperties.YAxisMinimumAuto && !double.IsNaN(Content.VisualProperties.YAxisMinimumFixedValue)) area.AxisY.Minimum = Content.VisualProperties.YAxisMinimumFixedValue;
255      if (!Content.VisualProperties.YAxisMaximumAuto && !double.IsNaN(Content.VisualProperties.YAxisMaximumFixedValue)) area.AxisY.Maximum = Content.VisualProperties.YAxisMaximumFixedValue;
256      if (!Content.VisualProperties.SecondYAxisMinimumAuto && !double.IsNaN(Content.VisualProperties.SecondYAxisMinimumFixedValue)) area.AxisY2.Minimum = Content.VisualProperties.SecondYAxisMinimumFixedValue;
257      if (!Content.VisualProperties.SecondYAxisMaximumAuto && !double.IsNaN(Content.VisualProperties.SecondYAxisMaximumFixedValue)) area.AxisY2.Maximum = Content.VisualProperties.SecondYAxisMaximumFixedValue;
258      if (area.AxisX.Minimum >= area.AxisX.Maximum) area.AxisX.Maximum = area.AxisX.Minimum + 1;
259      if (area.AxisX2.Minimum >= area.AxisX2.Maximum) area.AxisX2.Maximum = area.AxisX2.Minimum + 1;
260      if (area.AxisY.Minimum >= area.AxisY.Maximum) area.AxisY.Maximum = area.AxisY.Minimum + 1;
261      if (area.AxisY2.Minimum >= area.AxisY2.Maximum) area.AxisY2.Maximum = area.AxisY2.Minimum + 1;
262    }
263
264    protected virtual void UpdateYCursorInterval() {
265      double interestingValuesRange = (
266        from series in chart.Series
267        where series.Enabled
268        let values = (from point in series.Points
269                      where !point.IsEmpty
270                      select point.YValues[0]).DefaultIfEmpty(1.0)
271        let range = values.Max() - values.Min()
272        where range > 0.0
273        select range
274        ).DefaultIfEmpty(1.0).Min();
275
276      double digits = (int)Math.Log10(interestingValuesRange) - 3;
277      double yZoomInterval = Math.Pow(10, digits);
278      this.chart.ChartAreas[0].CursorY.Interval = yZoomInterval;
279    }
280
281    #region Event Handlers
282    #region Content Event Handlers
283    protected override void Content_NameChanged(object sender, EventArgs e) {
284      if (InvokeRequired)
285        Invoke(new EventHandler(Content_NameChanged), sender, e);
286      else {
287        chart.Titles[0].Text = Content.Name;
288        base.Content_NameChanged(sender, e);
289      }
290    }
291    private void Content_VisualPropertiesChanged(object sender, EventArgs e) {
292      if (InvokeRequired)
293        Invoke(new EventHandler(Content_VisualPropertiesChanged), sender, e);
294      else {
295        ConfigureChartArea(chart.ChartAreas[0]);
296        RecalculateAxesScale(chart.ChartAreas[0]); // axes min/max could have changed
297      }
298    }
299    #endregion
300    #region Rows Event Handlers
301    private void Rows_ItemsAdded(object sender, CollectionItemsChangedEventArgs<DataRow> e) {
302      if (InvokeRequired)
303        Invoke(new CollectionItemsChangedEventHandler<DataRow>(Rows_ItemsAdded), sender, e);
304      else {
305        AddDataRows(e.Items);
306      }
307    }
308    private void Rows_ItemsRemoved(object sender, CollectionItemsChangedEventArgs<DataRow> e) {
309      if (InvokeRequired)
310        Invoke(new CollectionItemsChangedEventHandler<DataRow>(Rows_ItemsRemoved), sender, e);
311      else {
312        RemoveDataRows(e.Items);
313      }
314    }
315    private void Rows_ItemsReplaced(object sender, CollectionItemsChangedEventArgs<DataRow> e) {
316      if (InvokeRequired)
317        Invoke(new CollectionItemsChangedEventHandler<DataRow>(Rows_ItemsReplaced), sender, e);
318      else {
319        RemoveDataRows(e.OldItems);
320        AddDataRows(e.Items);
321      }
322    }
323    private void Rows_CollectionReset(object sender, CollectionItemsChangedEventArgs<DataRow> e) {
324      if (InvokeRequired)
325        Invoke(new CollectionItemsChangedEventHandler<DataRow>(Rows_CollectionReset), sender, e);
326      else {
327        RemoveDataRows(e.OldItems);
328        AddDataRows(e.Items);
329      }
330    }
331    #endregion
332    #region Row Event Handlers
333    private void Row_VisualPropertiesChanged(object sender, EventArgs e) {
334      if (InvokeRequired)
335        Invoke(new EventHandler(Row_VisualPropertiesChanged), sender, e);
336      else {
337        DataRow row = (DataRow)sender;
338        Series series = chart.Series[row.Name];
339        series.Points.Clear();
340        ConfigureSeries(series, row);
341        FillSeriesWithRowValues(series, row);
342        RecalculateAxesScale(chart.ChartAreas[0]);
343      }
344    }
345    private void Row_NameChanged(object sender, EventArgs e) {
346      if (InvokeRequired)
347        Invoke(new EventHandler(Row_NameChanged), sender, e);
348      else {
349        DataRow row = (DataRow)sender;
350        chart.Series[row.Name].Name = row.Name;
351      }
352    }
353    #endregion
354    #region Values Event Handlers
355    private void Values_ItemsAdded(object sender, CollectionItemsChangedEventArgs<IndexedItem<double>> e) {
356      if (InvokeRequired)
357        Invoke(new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_ItemsAdded), sender, e);
358      else {
359        DataRow row = null;
360        valuesRowsTable.TryGetValue((IObservableList<double>)sender, out row);
361        if (row != null) {
362          Series rowSeries = chart.Series[row.Name];
363          if (!invisibleSeries.Contains(rowSeries)) {
364            rowSeries.Points.Clear();
365            FillSeriesWithRowValues(rowSeries, row);
366            RecalculateAxesScale(chart.ChartAreas[0]);
367            UpdateYCursorInterval();
368          }
369        }
370      }
371    }
372    private void Values_ItemsRemoved(object sender, CollectionItemsChangedEventArgs<IndexedItem<double>> e) {
373      if (InvokeRequired)
374        Invoke(new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_ItemsRemoved), sender, e);
375      else {
376        DataRow row = null;
377        valuesRowsTable.TryGetValue((IObservableList<double>)sender, out row);
378        if (row != null) {
379          Series rowSeries = chart.Series[row.Name];
380          if (!invisibleSeries.Contains(rowSeries)) {
381            rowSeries.Points.Clear();
382            FillSeriesWithRowValues(rowSeries, row);
383            RecalculateAxesScale(chart.ChartAreas[0]);
384            UpdateYCursorInterval();
385          }
386        }
387      }
388    }
389    private void Values_ItemsReplaced(object sender, CollectionItemsChangedEventArgs<IndexedItem<double>> e) {
390      if (InvokeRequired)
391        Invoke(new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_ItemsReplaced), sender, e);
392      else {
393        DataRow row = null;
394        valuesRowsTable.TryGetValue((IObservableList<double>)sender, out row);
395        if (row != null) {
396          Series rowSeries = chart.Series[row.Name];
397          if (!invisibleSeries.Contains(rowSeries)) {
398            if (row.VisualProperties.ChartType == DataRowVisualProperties.DataRowChartType.Histogram) {
399              rowSeries.Points.Clear();
400              FillSeriesWithRowValues(rowSeries, row);
401            } else {
402              foreach (IndexedItem<double> item in e.Items) {
403                if (IsInvalidValue(item.Value))
404                  rowSeries.Points[item.Index].IsEmpty = true;
405                else {
406                  rowSeries.Points[item.Index].YValues = new double[] { item.Value };
407                  rowSeries.Points[item.Index].IsEmpty = false;
408                }
409              }
410            }
411            RecalculateAxesScale(chart.ChartAreas[0]);
412            UpdateYCursorInterval();
413          }
414        }
415      }
416    }
417    private void Values_ItemsMoved(object sender, CollectionItemsChangedEventArgs<IndexedItem<double>> e) {
418      if (InvokeRequired)
419        Invoke(new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_ItemsMoved), sender, e);
420      else {
421        DataRow row = null;
422        valuesRowsTable.TryGetValue((IObservableList<double>)sender, out row);
423        if (row != null) {
424          Series rowSeries = chart.Series[row.Name];
425          if (!invisibleSeries.Contains(rowSeries)) {
426            rowSeries.Points.Clear();
427            FillSeriesWithRowValues(rowSeries, row);
428            RecalculateAxesScale(chart.ChartAreas[0]);
429            UpdateYCursorInterval();
430          }
431        }
432      }
433    }
434
435    private void Values_CollectionReset(object sender, CollectionItemsChangedEventArgs<IndexedItem<double>> e) {
436      if (InvokeRequired)
437        Invoke(new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_CollectionReset), sender, e);
438      else {
439        DataRow row = null;
440        valuesRowsTable.TryGetValue((IObservableList<double>)sender, out row);
441        if (row != null) {
442          Series rowSeries = chart.Series[row.Name];
443          if (!invisibleSeries.Contains(rowSeries)) {
444            rowSeries.Points.Clear();
445            FillSeriesWithRowValues(rowSeries, row);
446            RecalculateAxesScale(chart.ChartAreas[0]);
447            UpdateYCursorInterval();
448          }
449        }
450      }
451    }
452    #endregion
453    #endregion
454
455    #region Chart Event Handlers
456    private void chart_MouseDown(object sender, MouseEventArgs e) {
457      HitTestResult result = chart.HitTest(e.X, e.Y);
458      if (result.ChartElementType == ChartElementType.LegendItem) {
459        ToggleSeriesVisible(result.Series);
460      }
461    }
462    private void chart_MouseMove(object sender, MouseEventArgs e) {
463      HitTestResult result = chart.HitTest(e.X, e.Y);
464      if (result.ChartElementType == ChartElementType.LegendItem)
465        this.Cursor = Cursors.Hand;
466      else
467        this.Cursor = Cursors.Default;
468    }
469    private void chart_CustomizeLegend(object sender, CustomizeLegendEventArgs e) {
470      foreach (LegendItem legendItem in e.LegendItems) {
471        var series = chart.Series[legendItem.SeriesName];
472        if (series != null) {
473          bool seriesIsInvisible = invisibleSeries.Contains(series);
474          foreach (LegendCell cell in legendItem.Cells) {
475            cell.ForeColor = seriesIsInvisible ? Color.Gray : Color.Black;
476          }
477        }
478      }
479    }
480    #endregion
481
482    private void ToggleSeriesVisible(Series series) {
483      if (!invisibleSeries.Contains(series)) {
484        series.Points.Clear();
485        invisibleSeries.Add(series);
486      } else {
487        invisibleSeries.Remove(series);
488        if (Content != null) {
489
490          var row = (from r in Content.Rows
491                     where r.Name == series.Name
492                     select r).Single();
493          FillSeriesWithRowValues(series, row);
494          this.chart.Legends[series.Legend].ForeColor = Color.Black;
495          RecalculateAxesScale(chart.ChartAreas[0]);
496          UpdateYCursorInterval();
497        }
498      }
499    }
500
501    private void FillSeriesWithRowValues(Series series, DataRow row) {
502      switch (row.VisualProperties.ChartType) {
503        case DataRowVisualProperties.DataRowChartType.Histogram:
504          CalculateHistogram(series, row);
505          break;
506        default: {
507            bool yLogarithmic = series.YAxisType == AxisType.Primary
508                                  ? Content.VisualProperties.YAxisLogScale
509                                  : Content.VisualProperties.SecondYAxisLogScale;
510            bool xLogarithmic = series.XAxisType == AxisType.Primary
511                                  ? Content.VisualProperties.XAxisLogScale
512                                  : Content.VisualProperties.SecondXAxisLogScale;
513            for (int i = 0; i < row.Values.Count; i++) {
514              var value = row.Values[i];
515              var point = new DataPoint();
516              point.XValue = row.VisualProperties.StartIndexZero && !xLogarithmic ? i : i + 1;
517              if (IsInvalidValue(value) || (yLogarithmic && value <= 0))
518                point.IsEmpty = true;
519              else
520                point.YValues = new double[] { value };
521              series.Points.Add(point);
522            }
523          }
524          break;
525      }
526    }
527
528    protected virtual void CalculateHistogram(Series series, DataRow row) {
529      series.Points.Clear();
530      if (!row.Values.Any()) return;
531      int bins = row.VisualProperties.Bins;
532
533      double minValue = row.Values.Min();
534      double maxValue = row.Values.Max();
535      double intervalWidth = (maxValue - minValue) / bins;
536      if (intervalWidth < 0) return;
537      if (intervalWidth == 0) {
538        series.Points.AddXY(minValue, row.Values.Count);
539        return;
540      }
541
542      if (!row.VisualProperties.ExactBins) {
543        intervalWidth = HumanRoundRange(intervalWidth);
544        minValue = Math.Floor(minValue / intervalWidth) * intervalWidth;
545        maxValue = Math.Ceiling(maxValue / intervalWidth) * intervalWidth;
546      }
547
548      double intervalCenter = intervalWidth / 2;
549
550      double min = 0.0, max = 0.0;
551      if (!Double.IsNaN(Content.VisualProperties.XAxisMinimumFixedValue) && !Content.VisualProperties.XAxisMinimumAuto)
552        min = Content.VisualProperties.XAxisMinimumFixedValue;
553      else min = minValue;
554      if (!Double.IsNaN(Content.VisualProperties.XAxisMaximumFixedValue) && !Content.VisualProperties.XAxisMaximumAuto)
555        max = Content.VisualProperties.XAxisMaximumFixedValue;
556      else max = maxValue + intervalWidth;
557
558      double axisInterval = intervalWidth / row.VisualProperties.ScaleFactor;
559
560      var area = chart.ChartAreas[0];
561      area.AxisX.Interval = axisInterval;
562
563      series.SetCustomProperty("PointWidth", "1"); // 0.8 is the default value
564
565      // get the range or intervals which define the grouping of the frequency values
566      var doubleRange = DoubleRange(min, max, intervalWidth).Skip(1).ToList();
567
568      // aggregate the row values by unique key and frequency value
569      var valueFrequencies = (from v in row.Values
570                              where !IsInvalidValue(v)
571                              orderby v
572                              group v by v into g
573                              select new Tuple<double, double>(g.First(), g.Count())).ToList();
574
575      // shift the chart to the left so the bars are placed on the intervals
576      if (valueFrequencies.First().Item1 < doubleRange.First())
577        series.Points.Add(new DataPoint(min - intervalWidth, 0));
578
579      // add data points
580      int j = 0;
581      foreach (var d in doubleRange) {
582        double sum = 0.0;
583        // sum the frequency values that fall within the same interval
584        while (j < valueFrequencies.Count && valueFrequencies[j].Item1 < d) {
585          sum += valueFrequencies[j].Item2;
586          ++j;
587        }
588        string xAxisTitle = string.IsNullOrEmpty(Content.VisualProperties.XAxisTitle)
589                              ? "X"
590                              : Content.VisualProperties.XAxisTitle;
591        string yAxisTitle = string.IsNullOrEmpty(Content.VisualProperties.YAxisTitle)
592                              ? "Y"
593                              : Content.VisualProperties.YAxisTitle;
594        series.Points.Add(new DataPoint(d - intervalCenter, sum) {
595          ToolTip =
596            xAxisTitle + ": [" + (d - intervalWidth) + "-" + d + ")" + Environment.NewLine +
597            yAxisTitle + ": " + sum
598        });
599      }
600    }
601
602    #region Helpers
603    public static IEnumerable<double> DoubleRange(double min, double max, double step) {
604      double i;
605      for (i = min; i <= max; i += step)
606        yield return i;
607
608      if (i != max + step)
609        yield return i;
610    }
611
612    protected void RemoveCustomPropertyIfExists(Series series, string property) {
613      if (series.IsCustomPropertySet(property)) series.DeleteCustomProperty(property);
614    }
615
616    private double HumanRoundRange(double range) {
617      double base10 = Math.Pow(10.0, Math.Floor(Math.Log10(range)));
618      double rounding = range / base10;
619      if (rounding <= 1.5) rounding = 1;
620      else if (rounding <= 2.25) rounding = 2;
621      else if (rounding <= 3.75) rounding = 2.5;
622      else if (rounding <= 7.5) rounding = 5;
623      else rounding = 10;
624      return rounding * base10;
625    }
626
627    private double HumanRoundMax(double max) {
628      double base10;
629      if (max > 0) base10 = Math.Pow(10.0, Math.Floor(Math.Log10(max)));
630      else base10 = Math.Pow(10.0, Math.Ceiling(Math.Log10(-max)));
631      double rounding = (max > 0) ? base10 : -base10;
632      while (rounding < max) rounding += base10;
633      return rounding;
634    }
635
636    private ChartDashStyle ConvertLineStyle(DataRowVisualProperties.DataRowLineStyle dataRowLineStyle) {
637      switch (dataRowLineStyle) {
638        case DataRowVisualProperties.DataRowLineStyle.Dash:
639          return ChartDashStyle.Dash;
640        case DataRowVisualProperties.DataRowLineStyle.DashDot:
641          return ChartDashStyle.DashDot;
642        case DataRowVisualProperties.DataRowLineStyle.DashDotDot:
643          return ChartDashStyle.DashDotDot;
644        case DataRowVisualProperties.DataRowLineStyle.Dot:
645          return ChartDashStyle.Dot;
646        case DataRowVisualProperties.DataRowLineStyle.NotSet:
647          return ChartDashStyle.NotSet;
648        case DataRowVisualProperties.DataRowLineStyle.Solid:
649          return ChartDashStyle.Solid;
650        default:
651          return ChartDashStyle.NotSet;
652      }
653    }
654
655    protected static bool IsInvalidValue(double x) {
656      return double.IsNaN(x) || x < (double)decimal.MinValue || x > (double)decimal.MaxValue;
657    }
658    #endregion
659  }
660}
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