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Area chart incorrectly drawn when scrolling


VekiPeki
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Hello!

We have a problem drawing area charts using Chart FX 7 for Windows Forms (7.0.3306.26568). The problem is that the area chart is incorrectly rendered when the chart is zoomed and scrolled. We have had this problem earlier with Chart FX Client Server 6.2, but a hotfix for this was never released.

Since we presumed that you are no longer maintaining the COM version (and presumed this has been fixed in new versions), we have moved to Chart FX 7, but the same bug occurs nevertheless.

This is the code we used:

void Form1_Load(object sender, EventArgs e)
{
 ListProvider data = new ListProvider();
 data.List = new ArrayList();

 IList xData = new DateTime[] {
   DateTime.Now,
   DateTime.Now.AddHours(1),
   DateTime.Now.AddHours(2),
   DateTime.Now.AddHours(3),
   DateTime.Now.AddHours(4) };

 IList yDataFrom = new int[] { 1, 2, 3, 4, 5 };
 IList yDataTo = new int[] { 2, 3, 4, 5, 6 };

 data.List.Add(xData);
 data.List.Add(yDataFrom);
 data.List.Add(yDataTo);

 chart1.Data.Clear();
 chart1.Data.Series = 1;
 chart1.Data.Points = 5;

 chart1.Series[0].Gallery = Gallery.Area;
 chart1.Series[0].Color = System.Drawing.Color.FromArgb(196, Color.SteelBlue);
 
 chart1.AxisX.LabelsFormat.Format = AxisFormat.Time;

 chart1.DataSourceSettings.Fields.Clear();
 chart1.DataSourceSettings.Fields.Add(new FieldMap("Field1", FieldUsage.XValue));
 chart1.DataSourceSettings.Fields.Add(new FieldMap("Field2", FieldUsage.FromValue));
 chart1.DataSourceSettings.Fields.Add(new FieldMap("Field3", FieldUsage.Value));

 chart1.DataSource = data;
}

This is how the chart looks when the form is first loaded:

Posted Image

 

And this is what we get when we zoom in and scroll to the middle of the chart:

Posted Image 

 

We have provided a sample application also.

Thanks a lot and best regards,

Veki

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