问题描述
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我正在使用.Net 4.0中的图表库来创建具有多个系列的堆叠式柱形图。我的目标是建立一个直方图,以显示多个系列(教师)每天的动作(报告完成)总数。经常缺少数据(特定老师当天没有活动)。
当系列中缺少数据时,我会在栏上留下空白:
我的代码:
public ActionResult CompletionHistogram(int sid,int width,int height)
{
Site site = SiteRepository.Get(sid);
if (site == null)
return new HttpNotFoundResult();
Chart chart = new Chart();
chart.Height = height;
chart.Width = width;
ChartArea area = chart.ChartAreas.Add(\"Default\");
// Treat each teacher as a series
foreach (Teacher t in site.Teachers)
{
Series series = chart.Series.Add(t.FullName);
series.ChartType = SeriesChartType.StackedColumn;
series.Name = t.FullName;
// Group completions by day (filter out incomplete reports and null timestamps)
var groups = t.StudentReports
.Where<StudentReport>(rep => rep.IsComplete && rep.FirstSaveTimestamp.HasValue)
.GroupBy<StudentReport,DateTime>(rep => rep.FirstSaveTimestamp.Value.Date);
bool hasPoints = false;
foreach (var g in groups)
{
series.Points.AddXY(g.Key,g.Count());
hasPoints = true;
}
series.IsValueShownAsLabel = true;
series.ToolTip = \"#VALX\";
if (hasPoints)
chart.DataManipulator.InsertEmptyPoints(1,IntervalType.Days,series);
}
area.AxisX.LabelStyle.Format = \"ddd M/d\";
return new ChartResult(chart);
}
我该如何删除
解决方法
我有办法使这项工作。
很抱歉,答案很长,但是我发现您尝试实现此答案的方式会影响它是否起作用。
添加点时,需要手动将点设置为零。
注意:我无法通过在事实之后添加零点来完成这项工作。
请参阅示例和结果截图旁边的内容:
chart1.Series.Clear();
chart1.Series.Add(new Series());
chart1.Series.Add(new Series());
chart1.Series.Add(new Series());
chart1.Series.Add(new Series());
foreach (Series s in chart1.Series)
{
s.ChartType = SeriesChartType.StackedColumn;
}
//chart1.Series[0].Points.Add(new DataPoint(0,0));
chart1.Series[0].Points.Add(new DataPoint(1,3));
chart1.Series[0].Points.Add(new DataPoint(2,3));
chart1.Series[0].Points.Add(new DataPoint(3,3));
chart1.Series[1].Points.Add(new DataPoint(0,3));
//chart1.Series[1].Points.Add(new DataPoint(1,0));
chart1.Series[1].Points.Add(new DataPoint(2,3));
chart1.Series[1].Points.Add(new DataPoint(3,3));
chart1.Series[2].Points.Add(new DataPoint(0,3));
chart1.Series[2].Points.Add(new DataPoint(1,3));
//chart1.Series[2].Points.Add(new DataPoint(2,0));
chart1.Series[2].Points.Add(new DataPoint(3,3));
chart1.Series[3].Points.Add(new DataPoint(0,3));
chart1.Series[3].Points.Add(new DataPoint(1,3));
chart1.Series[3].Points.Add(new DataPoint(2,3));
//chart1.Series[3].Points.Add(new DataPoint(3,0));
chart1.SaveImage(\"C:\\\\Before.png\",ChartImageFormat.Png);
\“ before.png \”的图片:
现在,删除没有给定x值的数据点的系列注释:
(注意!我发现如果将给定x值的点添加到最后使y = 0的值(也就是在保存图像之前),这是行不通的。系列中点的顺序似乎很重要对于StackedColumn,除了研究如何回答此问题(对于此类用户可能是常识)之外,我从未使用过这种类型。
chart1.Series.Clear();
chart1.Series.Add(new Series());
chart1.Series.Add(new Series());
chart1.Series.Add(new Series());
chart1.Series.Add(new Series());
foreach (Series s in chart1.Series)
{
s.ChartType = SeriesChartType.StackedColumn;
}
chart1.Series[0].Points.Add(new DataPoint(0,3));
chart1.Series[1].Points.Add(new DataPoint(1,3));
chart1.Series[2].Points.Add(new DataPoint(2,3));
chart1.Series[3].Points.Add(new DataPoint(3,0));
// If you add the empty points here,it does not seem to work.
// Empty points are as follows,and are already added above in the \'after\' example.
// chart1.Series[0].Points.Add(new DataPoint(0,0));
// chart1.Series[1].Points.Add(new DataPoint(1,0));
// chart1.Series[2].Points.Add(new DataPoint(2,0));
// chart1.Series[3].Points.Add(new DataPoint(3,0));
chart1.SaveImage(\"C:\\\\After.png\",ChartImageFormat.Png);
\“ after.png \”的图片:
因此,假设您不能在事实之后添加零点(尽管您可以插入零点?),则需要将代码修改为如下所示:
var allPossibleGroups = t.StudentReports;
var groups = t.StudentReports
.Where<StudentReport>(rep => rep.IsComplete && rep.FirstSaveTimestamp.HasValue)
.GroupBy<StudentReport,DateTime>(rep => rep.FirstSaveTimestamp.Value.Date);
bool hasPoints = false;
foreach (var g in allPossibleGroups)
{
if(groups.ContainsKey(g))
{
series.Points.AddXY(g.Key,g.Count());
hasPoints = true;
}
else
{
series.Points.AddXY(g.Key,0);
}
}
很抱歉,很长的代码块,但是该示例是必要的,以演示如何使其工作,而不会陷入最后添加空点(其中y = 0)的陷阱,因为这将无法工作。
让我知道您是否需要更多帮助。
,我自己遇到了同样的问题,想分享正确的解决方案:
使用DataManipulator插入缺少的(x,y)值:
foreach (Series s in chart.Series)
{
chart.DataManipulator.Sort(PointSortOrder.Ascending,\"X\",s);
chart.DataManipulator.InsertEmptyPoints(1,IntervalType.Number,s);
}
,出于某种原因,循环播放序列对我不起作用,但是下一个解决方案像一个咒语一样起作用:
Chart1.DataManipulator.InsertEmptyPoints(1,\"Series1,Series2,Series3,Series4\")