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source: trunk/sources/HeuristicLab.Analysis.Views/3.3/DataTableView.cs @ 7259

Last change on this file since 7259 was 7259, checked in by swagner, 11 years ago

Updated year of copyrights to 2012 (#1716)

File size: 28.3 KB
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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 System;
23using System.Collections.Generic;
24using System.Drawing;
25using System.Linq;
26using System.Windows.Forms;
27using System.Windows.Forms.DataVisualization.Charting;
28using HeuristicLab.Collections;
29using HeuristicLab.Core.Views;
30using HeuristicLab.MainForm;
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      foreach (DataRow row in Content.Rows)
71        RegisterDataRowEvents(row);
72    }
73
74    protected virtual void RegisterDataRowEvents(DataRow row) {
75      row.NameChanged += new EventHandler(Row_NameChanged);
76      row.VisualPropertiesChanged += new EventHandler(Row_VisualPropertiesChanged);
77      valuesRowsTable.Add(row.Values, row);
78      row.Values.ItemsAdded += new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_ItemsAdded);
79      row.Values.ItemsRemoved += new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_ItemsRemoved);
80      row.Values.ItemsReplaced += new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_ItemsReplaced);
81      row.Values.ItemsMoved += new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_ItemsMoved);
82      row.Values.CollectionReset += new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_CollectionReset);
83    }
84    protected virtual void DeregisterDataRowEvents(DataRow row) {
85      row.Values.ItemsAdded -= new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_ItemsAdded);
86      row.Values.ItemsRemoved -= new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_ItemsRemoved);
87      row.Values.ItemsReplaced -= new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_ItemsReplaced);
88      row.Values.ItemsMoved -= new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_ItemsMoved);
89      row.Values.CollectionReset -= new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_CollectionReset);
90      valuesRowsTable.Remove(row.Values);
91      row.VisualPropertiesChanged -= new EventHandler(Row_VisualPropertiesChanged);
92      row.NameChanged -= new EventHandler(Row_NameChanged);
93    }
94    #endregion
95
96    protected override void OnContentChanged() {
97      base.OnContentChanged();
98      invisibleSeries.Clear();
99      chart.Titles[0].Text = string.Empty;
100      chart.ChartAreas[0].AxisX.Title = string.Empty;
101      chart.ChartAreas[0].AxisY.Title = string.Empty;
102      chart.ChartAreas[0].AxisY2.Title = string.Empty;
103      chart.Series.Clear();
104      if (Content != null) {
105        chart.Titles[0].Text = Content.Name;
106        foreach (DataRow row in Content.Rows)
107          AddDataRow(row);
108        ConfigureChartArea(chart.ChartAreas[0]);
109        RecalculateAxesScale(chart.ChartAreas[0]);
110      }
111    }
112
113    protected override void SetEnabledStateOfControls() {
114      base.SetEnabledStateOfControls();
115      chart.Enabled = Content != null;
116    }
117
118    public void ShowConfiguration() {
119      if (Content != null) {
120        using (DataTableVisualPropertiesDialog dialog = new DataTableVisualPropertiesDialog(Content)) {
121          dialog.ShowDialog(this);
122        }
123      } else MessageBox.Show("Nothing to configure.");
124    }
125
126    protected virtual void AddDataRow(DataRow row) {
127      Series series = new Series(row.Name);
128      if (row.VisualProperties.DisplayName.Trim() != String.Empty) series.LegendText = row.VisualProperties.DisplayName;
129      else series.LegendText = row.Name;
130      ConfigureSeries(series, row);
131      FillSeriesWithRowValues(series, row);
132
133      chart.Series.Add(series);
134      ConfigureChartArea(chart.ChartAreas[0]);
135      RecalculateAxesScale(chart.ChartAreas[0]);
136      UpdateYCursorInterval();
137    }
138
139    private void ConfigureSeries(Series series, DataRow row) {
140      RemoveCustomPropertyIfExists(series, "PointWidth");
141      series.BorderWidth = 1;
142      series.BorderDashStyle = ChartDashStyle.Solid;
143      series.BorderColor = Color.Empty;
144
145      if (row.VisualProperties.Color != Color.Empty)
146        series.Color = row.VisualProperties.Color;
147      else series.Color = Color.Empty;
148      series.IsVisibleInLegend = row.VisualProperties.IsVisibleInLegend;
149
150      switch (row.VisualProperties.ChartType) {
151        case DataRowVisualProperties.DataRowChartType.Line:
152          series.ChartType = SeriesChartType.FastLine;
153          series.BorderWidth = row.VisualProperties.LineWidth;
154          series.BorderDashStyle = ConvertLineStyle(row.VisualProperties.LineStyle);
155          break;
156        case DataRowVisualProperties.DataRowChartType.Bars:
157          // Bar is incompatible with anything but Bar and StackedBar*
158          if (!chart.Series.Any(x => x.ChartType != SeriesChartType.Bar && x.ChartType != SeriesChartType.StackedBar && x.ChartType != SeriesChartType.StackedBar100))
159            series.ChartType = SeriesChartType.Bar;
160          else {
161            series.ChartType = SeriesChartType.FastPoint; //default
162            row.VisualProperties.ChartType = DataRowVisualProperties.DataRowChartType.Points;
163          }
164          break;
165        case DataRowVisualProperties.DataRowChartType.Columns:
166          series.ChartType = SeriesChartType.Column;
167          break;
168        case DataRowVisualProperties.DataRowChartType.Points:
169          series.ChartType = SeriesChartType.FastPoint;
170          break;
171        case DataRowVisualProperties.DataRowChartType.Histogram:
172          series.ChartType = SeriesChartType.Column;
173          series.SetCustomProperty("PointWidth", "1");
174          if (!series.Color.IsEmpty && series.Color.GetBrightness() < 0.25)
175            series.BorderColor = Color.White;
176          else series.BorderColor = Color.Black;
177          break;
178        default:
179          series.ChartType = SeriesChartType.FastPoint;
180          break;
181      }
182      series.YAxisType = row.VisualProperties.SecondYAxis ? AxisType.Secondary : AxisType.Primary;
183      series.XAxisType = row.VisualProperties.SecondXAxis ? AxisType.Secondary : AxisType.Primary;
184      if (row.VisualProperties.DisplayName.Trim() != String.Empty) series.LegendText = row.VisualProperties.DisplayName;
185      else series.LegendText = row.Name;
186      series.ToolTip = series.LegendText + " X = #INDEX, Y = #VAL";
187    }
188
189    private void ConfigureChartArea(ChartArea area) {
190      if (Content.VisualProperties.TitleFont != null) chart.Titles[0].Font = Content.VisualProperties.TitleFont;
191      if (!Content.VisualProperties.TitleColor.IsEmpty) chart.Titles[0].ForeColor = Content.VisualProperties.TitleColor;
192      chart.Titles[0].Text = Content.VisualProperties.Title;
193
194      if (Content.VisualProperties.AxisTitleFont != null) area.AxisX.TitleFont = Content.VisualProperties.AxisTitleFont;
195      if (!Content.VisualProperties.AxisTitleColor.IsEmpty) area.AxisX.TitleForeColor = Content.VisualProperties.AxisTitleColor;
196      area.AxisX.Title = Content.VisualProperties.XAxisTitle;
197
198      if (Content.VisualProperties.AxisTitleFont != null) area.AxisX2.TitleFont = Content.VisualProperties.AxisTitleFont;
199      if (!Content.VisualProperties.AxisTitleColor.IsEmpty) area.AxisX2.TitleForeColor = Content.VisualProperties.AxisTitleColor;
200      area.AxisX2.Title = Content.VisualProperties.SecondXAxisTitle;
201
202      if (Content.VisualProperties.AxisTitleFont != null) area.AxisY.TitleFont = Content.VisualProperties.AxisTitleFont;
203      if (!Content.VisualProperties.AxisTitleColor.IsEmpty) area.AxisY.TitleForeColor = Content.VisualProperties.AxisTitleColor;
204      area.AxisY.Title = Content.VisualProperties.YAxisTitle;
205
206      if (Content.VisualProperties.AxisTitleFont != null) area.AxisY2.TitleFont = Content.VisualProperties.AxisTitleFont;
207      if (!Content.VisualProperties.AxisTitleColor.IsEmpty) area.AxisY2.TitleForeColor = Content.VisualProperties.AxisTitleColor;
208      area.AxisY2.Title = Content.VisualProperties.SecondYAxisTitle;
209    }
210
211    private void RecalculateAxesScale(ChartArea area) {
212      // Reset the axes bounds so that RecalculateAxesScale() will assign new bounds
213      foreach (Axis a in area.Axes) {
214        a.Minimum = double.NaN;
215        a.Maximum = double.NaN;
216      }
217      area.RecalculateAxesScale();
218      area.AxisX.IsMarginVisible = false;
219      area.AxisX2.IsMarginVisible = false;
220
221      if (!Content.VisualProperties.XAxisMinimumAuto && !double.IsNaN(Content.VisualProperties.XAxisMinimumFixedValue)) area.AxisX.Minimum = Content.VisualProperties.XAxisMinimumFixedValue;
222      if (!Content.VisualProperties.XAxisMaximumAuto && !double.IsNaN(Content.VisualProperties.XAxisMaximumFixedValue)) area.AxisX.Maximum = Content.VisualProperties.XAxisMaximumFixedValue;
223      if (!Content.VisualProperties.SecondXAxisMinimumAuto && !double.IsNaN(Content.VisualProperties.SecondXAxisMinimumFixedValue)) area.AxisX2.Minimum = Content.VisualProperties.SecondXAxisMinimumFixedValue;
224      if (!Content.VisualProperties.SecondXAxisMaximumAuto && !double.IsNaN(Content.VisualProperties.SecondXAxisMaximumFixedValue)) area.AxisX2.Maximum = Content.VisualProperties.SecondXAxisMaximumFixedValue;
225      if (!Content.VisualProperties.YAxisMinimumAuto && !double.IsNaN(Content.VisualProperties.YAxisMinimumFixedValue)) area.AxisY.Minimum = Content.VisualProperties.YAxisMinimumFixedValue;
226      if (!Content.VisualProperties.YAxisMaximumAuto && !double.IsNaN(Content.VisualProperties.YAxisMaximumFixedValue)) area.AxisY.Maximum = Content.VisualProperties.YAxisMaximumFixedValue;
227      if (!Content.VisualProperties.SecondYAxisMinimumAuto && !double.IsNaN(Content.VisualProperties.SecondYAxisMinimumFixedValue)) area.AxisY2.Minimum = Content.VisualProperties.SecondYAxisMinimumFixedValue;
228      if (!Content.VisualProperties.SecondYAxisMaximumAuto && !double.IsNaN(Content.VisualProperties.SecondYAxisMaximumFixedValue)) area.AxisY2.Maximum = Content.VisualProperties.SecondYAxisMaximumFixedValue;
229      if (area.AxisX.Minimum >= area.AxisX.Maximum) area.AxisX.Maximum = area.AxisX.Minimum + 1;
230      if (area.AxisX2.Minimum >= area.AxisX2.Maximum) area.AxisX2.Maximum = area.AxisX2.Minimum + 1;
231      if (area.AxisY.Minimum >= area.AxisY.Maximum) area.AxisY.Maximum = area.AxisY.Minimum + 1;
232      if (area.AxisY2.Minimum >= area.AxisY2.Maximum) area.AxisY2.Maximum = area.AxisY2.Minimum + 1;
233    }
234
235    protected virtual void UpdateYCursorInterval() {
236      double interestingValuesRange = (
237        from series in chart.Series
238        where series.Enabled
239        let values = (from point in series.Points
240                      where !point.IsEmpty
241                      select point.YValues[0]).DefaultIfEmpty(1.0)
242        let range = values.Max() - values.Min()
243        where range > 0.0
244        select range
245        ).DefaultIfEmpty(1.0).Min();
246
247      double digits = (int)Math.Log10(interestingValuesRange) - 3;
248      double yZoomInterval = Math.Pow(10, digits);
249      this.chart.ChartAreas[0].CursorY.Interval = yZoomInterval;
250    }
251
252
253    protected virtual void RemoveDataRow(DataRow row) {
254      Series series = chart.Series[row.Name];
255      chart.Series.Remove(series);
256      if (invisibleSeries.Contains(series))
257        invisibleSeries.Remove(series);
258      RecalculateAxesScale(chart.ChartAreas[0]);
259    }
260
261    #region Event Handlers
262    #region Content Event Handlers
263    protected override void Content_NameChanged(object sender, EventArgs e) {
264      if (InvokeRequired)
265        Invoke(new EventHandler(Content_NameChanged), sender, e);
266      else {
267        chart.Titles[0].Text = Content.Name;
268        base.Content_NameChanged(sender, e);
269      }
270    }
271    private void Content_VisualPropertiesChanged(object sender, EventArgs e) {
272      if (InvokeRequired)
273        Invoke(new EventHandler(Content_VisualPropertiesChanged), sender, e);
274      else {
275        ConfigureChartArea(chart.ChartAreas[0]);
276        RecalculateAxesScale(chart.ChartAreas[0]); // axes min/max could have changed
277      }
278    }
279    #endregion
280    #region Rows Event Handlers
281    private void Rows_ItemsAdded(object sender, CollectionItemsChangedEventArgs<DataRow> e) {
282      if (InvokeRequired)
283        Invoke(new CollectionItemsChangedEventHandler<DataRow>(Rows_ItemsAdded), sender, e);
284      else {
285        foreach (DataRow row in e.Items) {
286          AddDataRow(row);
287          RegisterDataRowEvents(row);
288        }
289      }
290    }
291    private void Rows_ItemsRemoved(object sender, CollectionItemsChangedEventArgs<DataRow> e) {
292      if (InvokeRequired)
293        Invoke(new CollectionItemsChangedEventHandler<DataRow>(Rows_ItemsRemoved), sender, e);
294      else {
295        foreach (DataRow row in e.Items) {
296          DeregisterDataRowEvents(row);
297          RemoveDataRow(row);
298        }
299      }
300    }
301    private void Rows_ItemsReplaced(object sender, CollectionItemsChangedEventArgs<DataRow> e) {
302      if (InvokeRequired)
303        Invoke(new CollectionItemsChangedEventHandler<DataRow>(Rows_ItemsReplaced), sender, e);
304      else {
305        foreach (DataRow row in e.OldItems) {
306          DeregisterDataRowEvents(row);
307          RemoveDataRow(row);
308        }
309        foreach (DataRow row in e.Items) {
310          AddDataRow(row);
311          RegisterDataRowEvents(row);
312        }
313      }
314    }
315    private void Rows_CollectionReset(object sender, CollectionItemsChangedEventArgs<DataRow> e) {
316      if (InvokeRequired)
317        Invoke(new CollectionItemsChangedEventHandler<DataRow>(Rows_CollectionReset), sender, e);
318      else {
319        foreach (DataRow row in e.OldItems) {
320          DeregisterDataRowEvents(row);
321          RemoveDataRow(row);
322        }
323        foreach (DataRow row in e.Items) {
324          AddDataRow(row);
325          RegisterDataRowEvents(row);
326        }
327      }
328    }
329    #endregion
330    #region Row Event Handlers
331    private void Row_VisualPropertiesChanged(object sender, EventArgs e) {
332      if (InvokeRequired)
333        Invoke(new EventHandler(Row_VisualPropertiesChanged), sender, e);
334      else {
335        DataRow row = (DataRow)sender;
336        Series series = chart.Series[row.Name];
337        series.Points.Clear();
338        ConfigureSeries(series, row);
339        FillSeriesWithRowValues(series, row);
340        RecalculateAxesScale(chart.ChartAreas[0]);
341      }
342    }
343    private void Row_NameChanged(object sender, EventArgs e) {
344      if (InvokeRequired)
345        Invoke(new EventHandler(Row_NameChanged), sender, e);
346      else {
347        DataRow row = (DataRow)sender;
348        chart.Series[row.Name].Name = row.Name;
349      }
350    }
351    #endregion
352    #region Values Event Handlers
353    private void Values_ItemsAdded(object sender, CollectionItemsChangedEventArgs<IndexedItem<double>> e) {
354      if (InvokeRequired)
355        Invoke(new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_ItemsAdded), sender, e);
356      else {
357        DataRow row = null;
358        valuesRowsTable.TryGetValue((IObservableList<double>)sender, out row);
359        if (row != null) {
360          Series rowSeries = chart.Series[row.Name];
361          if (!invisibleSeries.Contains(rowSeries)) {
362            rowSeries.Points.Clear();
363            FillSeriesWithRowValues(rowSeries, row);
364            RecalculateAxesScale(chart.ChartAreas[0]);
365            UpdateYCursorInterval();
366          }
367        }
368      }
369    }
370    private void Values_ItemsRemoved(object sender, CollectionItemsChangedEventArgs<IndexedItem<double>> e) {
371      if (InvokeRequired)
372        Invoke(new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_ItemsRemoved), sender, e);
373      else {
374        DataRow row = null;
375        valuesRowsTable.TryGetValue((IObservableList<double>)sender, out row);
376        if (row != null) {
377          Series rowSeries = chart.Series[row.Name];
378          if (!invisibleSeries.Contains(rowSeries)) {
379            rowSeries.Points.Clear();
380            FillSeriesWithRowValues(rowSeries, row);
381            RecalculateAxesScale(chart.ChartAreas[0]);
382            UpdateYCursorInterval();
383          }
384        }
385      }
386    }
387    private void Values_ItemsReplaced(object sender, CollectionItemsChangedEventArgs<IndexedItem<double>> e) {
388      if (InvokeRequired)
389        Invoke(new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_ItemsReplaced), sender, e);
390      else {
391        DataRow row = null;
392        valuesRowsTable.TryGetValue((IObservableList<double>)sender, out row);
393        if (row != null) {
394          Series rowSeries = chart.Series[row.Name];
395          if (!invisibleSeries.Contains(rowSeries)) {
396            if (row.VisualProperties.ChartType == DataRowVisualProperties.DataRowChartType.Histogram) {
397              rowSeries.Points.Clear();
398              FillSeriesWithRowValues(rowSeries, row);
399            } else {
400              foreach (IndexedItem<double> item in e.Items) {
401                if (IsInvalidValue(item.Value))
402                  rowSeries.Points[item.Index].IsEmpty = true;
403                else {
404                  rowSeries.Points[item.Index].YValues = new double[] { item.Value };
405                  rowSeries.Points[item.Index].IsEmpty = false;
406                }
407              }
408            }
409            RecalculateAxesScale(chart.ChartAreas[0]);
410            UpdateYCursorInterval();
411          }
412        }
413      }
414    }
415    private void Values_ItemsMoved(object sender, CollectionItemsChangedEventArgs<IndexedItem<double>> e) {
416      if (InvokeRequired)
417        Invoke(new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_ItemsMoved), sender, e);
418      else {
419        DataRow row = null;
420        valuesRowsTable.TryGetValue((IObservableList<double>)sender, out row);
421        if (row != null) {
422          Series rowSeries = chart.Series[row.Name];
423          if (!invisibleSeries.Contains(rowSeries)) {
424            rowSeries.Points.Clear();
425            FillSeriesWithRowValues(rowSeries, row);
426            RecalculateAxesScale(chart.ChartAreas[0]);
427            UpdateYCursorInterval();
428          }
429        }
430      }
431    }
432
433    private void Values_CollectionReset(object sender, CollectionItemsChangedEventArgs<IndexedItem<double>> e) {
434      if (InvokeRequired)
435        Invoke(new CollectionItemsChangedEventHandler<IndexedItem<double>>(Values_CollectionReset), sender, e);
436      else {
437        DataRow row = null;
438        valuesRowsTable.TryGetValue((IObservableList<double>)sender, out row);
439        if (row != null) {
440          Series rowSeries = chart.Series[row.Name];
441          if (!invisibleSeries.Contains(rowSeries)) {
442            rowSeries.Points.Clear();
443            FillSeriesWithRowValues(rowSeries, row);
444            RecalculateAxesScale(chart.ChartAreas[0]);
445            UpdateYCursorInterval();
446          }
447        }
448      }
449    }
450    #endregion
451    #endregion
452
453    #region Chart Event Handlers
454    private void chart_MouseDown(object sender, MouseEventArgs e) {
455      HitTestResult result = chart.HitTest(e.X, e.Y);
456      if (result.ChartElementType == ChartElementType.LegendItem) {
457        ToggleSeriesVisible(result.Series);
458      }
459    }
460    private void chart_MouseMove(object sender, MouseEventArgs e) {
461      HitTestResult result = chart.HitTest(e.X, e.Y);
462      if (result.ChartElementType == ChartElementType.LegendItem)
463        this.Cursor = Cursors.Hand;
464      else
465        this.Cursor = Cursors.Default;
466    }
467    private void chart_CustomizeLegend(object sender, CustomizeLegendEventArgs e) {
468      foreach (LegendItem legendItem in e.LegendItems) {
469        var series = chart.Series[legendItem.SeriesName];
470        if (series != null) {
471          bool seriesIsInvisible = invisibleSeries.Contains(series);
472          foreach (LegendCell cell in legendItem.Cells) {
473            cell.ForeColor = seriesIsInvisible ? Color.Gray : Color.Black;
474          }
475        }
476      }
477    }
478    #endregion
479
480    private void ToggleSeriesVisible(Series series) {
481      if (!invisibleSeries.Contains(series)) {
482        series.Points.Clear();
483        invisibleSeries.Add(series);
484      } else {
485        invisibleSeries.Remove(series);
486        if (Content != null) {
487
488          var row = (from r in Content.Rows
489                     where r.Name == series.Name
490                     select r).Single();
491          FillSeriesWithRowValues(series, row);
492          this.chart.Legends[series.Legend].ForeColor = Color.Black;
493          RecalculateAxesScale(chart.ChartAreas[0]);
494          UpdateYCursorInterval();
495        }
496      }
497    }
498
499    private void FillSeriesWithRowValues(Series series, DataRow row) {
500      switch (row.VisualProperties.ChartType) {
501        case DataRowVisualProperties.DataRowChartType.Histogram:
502          CalculateHistogram(series, row);
503          break;
504        default: {
505            for (int i = 0; i < row.Values.Count; i++) {
506              var value = row.Values[i];
507              DataPoint point = new DataPoint();
508              point.XValue = row.VisualProperties.StartIndexZero ? i : i + 1;
509              if (IsInvalidValue(value))
510                point.IsEmpty = true;
511              else
512                point.YValues = new double[] { value };
513              series.Points.Add(point);
514            }
515          }
516          break;
517      }
518    }
519
520    protected virtual void CalculateHistogram(Series series, DataRow row) {
521      series.Points.Clear();
522      if (!row.Values.Any()) return;
523      int bins = row.VisualProperties.Bins;
524
525      double minValue = row.Values.Min();
526      double maxValue = row.Values.Max();
527      double intervalWidth = (maxValue - minValue) / bins;
528      if (intervalWidth < 0) return;
529      if (intervalWidth == 0) {
530        series.Points.AddXY(minValue, row.Values.Count);
531        return;
532      }
533
534      if (!row.VisualProperties.ExactBins) {
535        intervalWidth = HumanRoundRange(intervalWidth);
536        minValue = Math.Floor(minValue / intervalWidth) * intervalWidth;
537        maxValue = Math.Ceiling(maxValue / intervalWidth) * intervalWidth;
538      }
539
540      double intervalCenter = intervalWidth / 2;
541
542      double min = 0.0;
543      if (!Double.IsNaN(Content.VisualProperties.XAxisMinimumFixedValue) && !Content.VisualProperties.XAxisMinimumAuto)
544        min = Content.VisualProperties.XAxisMinimumFixedValue;
545      else min = minValue;
546
547      double axisInterval = intervalWidth / row.VisualProperties.ScaleFactor;
548
549      var area = chart.ChartAreas[0];
550      area.AxisX.Interval = axisInterval;
551
552      series.SetCustomProperty("PointWidth", "1"); // 0.8 is the default value
553
554      // get the range or intervals which define the grouping of the frequency values
555      var doubleRange = DoubleRange(min, maxValue + intervalWidth, intervalWidth).Skip(1).ToList();
556
557      // aggregate the row values by unique key and frequency value
558      var valueFrequencies = (from v in row.Values
559                              where !IsInvalidValue(v)
560                              orderby v
561                              group v by v into g
562                              select new Tuple<double, double>(g.First(), g.Count())).ToList();
563
564      // shift the chart to the left so the bars are placed on the intervals
565      if (valueFrequencies.First().Item1 < doubleRange.First())
566        series.Points.Add(new DataPoint(min - intervalWidth, 0));
567
568      // add data points
569      int j = 0;
570      foreach (var d in doubleRange) {
571        double sum = 0.0;
572        // sum the frequency values that fall within the same interval
573        while (j < valueFrequencies.Count && valueFrequencies[j].Item1 < d) {
574          sum += valueFrequencies[j].Item2;
575          ++j;
576        }
577        series.Points.Add(new DataPoint(d - intervalCenter, sum) { ToolTip = "X: [" + (d - intervalWidth) + "-" + d + "), Y: " + sum });
578      }
579    }
580
581    #region Helpers
582    public static IEnumerable<double> DoubleRange(double min, double max, double step) {
583      double i;
584      for (i = min; i <= max; i += step)
585        yield return i;
586
587      if (i != max + step)
588        yield return i;
589    }
590
591    protected void RemoveCustomPropertyIfExists(Series series, string property) {
592      if (series.IsCustomPropertySet(property)) series.DeleteCustomProperty(property);
593    }
594
595    private double HumanRoundRange(double range) {
596      double base10 = Math.Pow(10.0, Math.Floor(Math.Log10(range)));
597      double rounding = range / base10;
598      if (rounding <= 1.5) rounding = 1;
599      else if (rounding <= 2.25) rounding = 2;
600      else if (rounding <= 3.75) rounding = 2.5;
601      else if (rounding <= 7.5) rounding = 5;
602      else rounding = 10;
603      return rounding * base10;
604    }
605
606    private double HumanRoundMax(double max) {
607      double base10;
608      if (max > 0) base10 = Math.Pow(10.0, Math.Floor(Math.Log10(max)));
609      else base10 = Math.Pow(10.0, Math.Ceiling(Math.Log10(-max)));
610      double rounding = (max > 0) ? base10 : -base10;
611      while (rounding < max) rounding += base10;
612      return rounding;
613    }
614
615    private ChartDashStyle ConvertLineStyle(DataRowVisualProperties.DataRowLineStyle dataRowLineStyle) {
616      switch (dataRowLineStyle) {
617        case DataRowVisualProperties.DataRowLineStyle.Dash:
618          return ChartDashStyle.Dash;
619        case DataRowVisualProperties.DataRowLineStyle.DashDot:
620          return ChartDashStyle.DashDot;
621        case DataRowVisualProperties.DataRowLineStyle.DashDotDot:
622          return ChartDashStyle.DashDotDot;
623        case DataRowVisualProperties.DataRowLineStyle.Dot:
624          return ChartDashStyle.Dot;
625        case DataRowVisualProperties.DataRowLineStyle.NotSet:
626          return ChartDashStyle.NotSet;
627        case DataRowVisualProperties.DataRowLineStyle.Solid:
628          return ChartDashStyle.Solid;
629        default:
630          return ChartDashStyle.NotSet;
631      }
632    }
633
634    protected static bool IsInvalidValue(double x) {
635      return double.IsNaN(x) || x < (double)decimal.MinValue || x > (double)decimal.MaxValue;
636    }
637    #endregion
638  }
639}
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