ASP.NET Stackedbar chart markers

问题

I am trying to add markers on my stacked bar chart programmatically and they do not seem to show up. In reality, I need to show a marker on the average of the datapoint but right now, I cannot even show a simple marker on the chart.

What am I doing wrong ?

Code:

Dim chart As New Chart chart.ID = DtDistinct.Rows(I)("CourseSisID")

                Dim chartareas As New ChartArea
                chart.ChartAreas.Add(chartareas)

                chart.Series.Clear()

                chart.DataBindCrossTable(DtRecords.DefaultView, "Outcomescore", "ShortName", "RecordsPerGroup", "")

                chart.ChartAreas(0).AxisY.Interval = 1
                chart.ChartAreas(0).AxisY.Enabled = AxisEnabled.False


                chart.Palette = ChartColorPalette.None
                chart.PaletteCustomColors = New Color() {ColorTranslator.FromHtml("#DF5B59"), ColorTranslator.FromHtml("#E0D773 "), ColorTranslator.FromHtml("#8AAC53"), ColorTranslator.FromHtml("#6A843F")}
                chart.ChartAreas(0).AxisX.MajorGrid.Enabled = False
                chart.ChartAreas(0).AxisY.MajorGrid.Enabled = False




                For Each cs As Series In chart.Series
                    cs.ChartType = SeriesChartType.StackedBar

                    cs.Points().FindMaxByValue.MarkerColor = Color.AliceBlue
                    cs.Points().FindMaxByValue.MarkerSize = 13
                    cs.Points().FindMaxByValue.MarkerStyle = MarkerStyle.Diamond


                Next


                pnlcharts.Controls.Add(chart)

Here is an image of what I am trying to do. I know that the above code will not give me the below image but I was trying to find a workaround with the above code, before I realized that markers cannot appear on bar charts.

I would like to see that striped line on the bar chart. The striped line should appear on the calculated average of the points.

So, an another way I could do was to use annotations since markers are not supported by stackedbar charts. I wrote the following code to add an annotation line, but it still does not give me the output I need only because I do not know how to do it for each Y value on the chart.

Here is my code:

Dim chart As New Chart chart.ID = DtDistinct.Rows(I)("CourseSisID")

Dim chartareas As New ChartArea chart.ChartAreas.Add(chartareas)

chart.DataBindCrossTable(DtRecords.DefaultView, "OutcomeScore", "ShortName", "RecordsPerGroup", "Label=RecordsPerGroup")

                chart.Palette = ChartColorPalette.None
                chart.PaletteCustomColors = New Color() {ColorTranslator.FromHtml("#DF5B59"), ColorTranslator.FromHtml("#E0D773 "), ColorTranslator.FromHtml("#8AAC53"), ColorTranslator.FromHtml("#6A843F")}

                chart.ChartAreas(0).AxisX.MajorGrid.Enabled = False
                chart.ChartAreas(0).AxisY.MajorGrid.Enabled = False



                Dim charttitle As New Title
                charttitle.Text = DtDistinct.Rows(I)("CourseSisID")
                chart.Titles.Add(charttitle)

                For Each cs As Series In chart.Series
                    cs.ChartType = SeriesChartType.StackedBar
                Next


                Dim ann1 As New VerticalLineAnnotation()
                ann1.AxisX = chart.ChartAreas(0).AxisX
                ann1.AxisY = chart.ChartAreas(0).AxisY
                ann1.IsSizeAlwaysRelative = False
               ann1.X = chart.DataManipulator.Statistics.Mean(chart.Series(0).Name)


                ann1.IsInfinitive = True
                ann1.ClipToChartArea = chart.ChartAreas(0).Name
                ann1.LineColor = Color.Coral
                ann1.LineWidth = 3


                ann1.AnchorX = 1
                ann1.AnchorY = 5

                chart.Annotations.Add(ann1)                

                ann1.LineDashStyle = ChartDashStyle.Dash

                pnlcharts.Controls.Add(chart)

Here is what I get with the above code:

Here is what I need : Notice how the strip line is at a different value for each bar.

回答1:

                    Dim annotation2 As New LineAnnotation()
                    annotation2.IsSizeAlwaysRelative = False
                    annotation2.AxisX = chart.ChartAreas(0).AxisX
                    annotation2.AxisY = chart.ChartAreas(0).AxisY

                    annotation2.Height = 1
                    annotation2.Width = 0
                    annotation2.LineWidth = 1.5
                    annotation2.StartCap = LineAnchorCapStyle.None
                    annotation2.EndCap = LineAnchorCapStyle.None
                    annotation2.AnchorX = AvgVar
                    annotation2.ToolTip = "Average=" & AvgVar

                    Select Case row
                        Case 1
                            annotation2.AnchorY = 4.5
                        Case 2
                            annotation2.AnchorY = 3.5
                        Case 3
                            annotation2.AnchorY = 2.5
                        Case 4
                            annotation2.AnchorY = 1.5
                        Case 5
                            annotation2.AnchorY = 0.5
                    End Select


                    ' <- your point
                    annotation2.LineColor = Color.Gray
                    annotation2.LineDashStyle = ChartDashStyle.Dash

                    ' <- your color
                    chart.Annotations.Add(annotation2)

来源：https://stackoverflow.com/questions/43216347/asp-net-stackedbar-chart-markers

标签

ASP.NET

charts

stacked-chart