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isaac

Bar chart location doesn't match up X-Axis(DateTime)

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Hello,

I'm trying to show some event with bar chart.

 

[Im trying to]

X-Axis format is DateTime.

Each bar is a event that occured at bar's X-Axis time.

Each series is a event's type (there is many series)

 

But bar's x-axis location doesn't match up it's x-value.

 

[for example]

In Code: chart.Data.X[0.0] = Convert.ToString("2020-05-20 16:00:00").ToOADate();

In Chart: bar's x-axis location looks like "2020-05-15 02:00:00";

All bar's locations seems to be moved to right;

 

how can I solve this problem?

help me please.

 

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Can you please post some sample data along with an image of the chart you would want to create for such data?

In our product some gallery types (like Scatter, Line, Area) support arbitrary X values while others (like Bar) do not as it would cause Bars to be overlapped or not have the same width.

Regards,

JuanC

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Because of company policy of Information Security, I can't append a Image File.

But I could post sample code that I'd tried to.

 

Here is code (I want for bar to be located exactly what bar's x-value points):

 

public Form1()
        {
            InitializeComponent();
            DataTable valueDT = new DataTable();
            valueDT.Columns.Add("time", typeof(DateTime));
            valueDT.Columns.Add("value", typeof(int));
            valueDT.Rows.Add(Convert.ToDateTime("2020-05-21 01:00:00"), 1);
            valueDT.Rows.Add(Convert.ToDateTime("2020-05-21 02:00:00"), 2);
            valueDT.Rows.Add(Convert.ToDateTime("2020-05-21 03:00:00"), 6);
            valueDT.Rows.Add(Convert.ToDateTime("2020-05-21 04:00:00"), 4);
            valueDT.Rows.Add(Convert.ToDateTime("2020-05-21 05:00:00"), 2);
            valueDT.Rows.Add(Convert.ToDateTime("2020-05-21 06:00:00"), 3);

            DataTable eventDT = new DataTable();
            eventDT.Columns.Add("time", typeof(DateTime));
            eventDT.Rows.Add(Convert.ToDateTime("2020-05-21 01:00:00"));
            eventDT.Rows.Add(Convert.ToDateTime("2020-05-21 02:00:00"));
            eventDT.Rows.Add(Convert.ToDateTime("2020-05-21 03:00:00"));
            eventDT.Rows.Add(Convert.ToDateTime("2020-05-21 04:00:00"));
            eventDT.Rows.Add(Convert.ToDateTime("2020-05-21 05:00:00"));
            eventDT.Rows.Add(Convert.ToDateTime("2020-05-21 06:00:00"));

            this.Controls.Add(GetChart(valueDT, eventDT));
        }

        public ChartFX.WinForms.Chart GetChart(DataTable valueDT, DataTable eventDT)
        {
            ChartFX.WinForms.Chart chart = new ChartFX.WinForms.Chart();
            chart.Data.Series = 2;

            chart.Series[0].Text = "value";
            for(int i = 0; i < valueDT.Rows.Count; i++)
            {
                DataRow r = valueDT.Rows;
                chart.Data.X[0, i] = Convert.ToDateTime(r["time"]).ToOADate();
                chart.Data.Y[0, i] = Convert.ToInt32(r["value"]);
            }

            chart.Series[1].Text = "event";
            for(int i = 0; i < eventDT.Rows.Count; i++)
            {
                DataRow r = eventDT.Rows;
                chart.Data.X[1, i] = Convert.ToDateTime(r["time"]).ToOADate();
                chart.Data.Y[1, i] = 10;
            }


            chart.AllSeries.Gallery = ChartFX.WinForms.Gallery.Bar;
            ((ChartFX.WinForms.Galleries.Bar)chart.GalleryAttributes).Overlap = true;
            chart.AllSeries.Gallery = ChartFX.WinForms.Gallery.Lines;

            chart.AxisY.Max = 10;
            chart.AxisY.Min = 0;

            chart.AxisX.LabelsFormat.CustomFormat = "MM-dd HH:mm";
            chart.AxisX.LabelsFormat.Format = ChartFX.WinForms.AxisFormat.DateTime;

            chart.Series[1].Gallery = ChartFX.WinForms.Gallery.Bar;
            chart.Series[1].Volume = 1;

            chart.Dock = DockStyle.Fill;
            return chart;
        }

Edited by isaac

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