ffiala wrote at 2012-02-23 12:40:

During my first experiments with OxyPlot I found the following detail:

When using a scale of one or ten years the scale is error free.
Example: http://oxyplot.iam.at/examplesvg.aspx?title=DateTimeAxisFiala.DateTime+axis1+Fiala

But when using a scale of 100 years additional and smaller ticks can be seen on the time axis at 1930, 1960 and 1990).
Example: http://oxyplot.iam.at/examplesvg.aspx?title=DateTimeAxisFiala.DateTime+axis2+Fiala
Code: http://oxyplot.iam.at/examplecode.aspx?title=DateTimeAxisFiala.DateTime+axis2+Fiala

Am I missing a setting?
Thank You, Franz 

objo wrote at 2012-02-23 22:16:

Thanks for attaching the example, getting the code makes it much easier to reproduce the bugs!

Sorry, the DateTimeAxis is not completed yet - I see it does not work properly with long (100 years) time ranges.

I tried setting the IntervalType = DateTimeIntervalType.Years (which should force the axis to show years only). I also think that part of the problem is that MajorStep/MinorStep (in days) cannot handle leap years properly. A solution could be to give Minimum/Maximum/MajorStep/MinorStep in years when the Interval type is Years.

Workaround: Can you use a LinearAxis with years as numbers instead?

Can I include your example as a test we can use to get the "long-term" DateTimeAxis working?

ffiala wrote at 2012-02-24 16:07:

Thanks for the advice to use LinearAxes instead of DateTimeAxes. This version now works perfectly.

Example: http://oxyplot.iam.at/examplesvg.aspx?title=DateTimeAxisFiala.DateTime+axis3+Fiala
Code: http://oxyplot.iam.at/examplecode.aspx?title=DateTimeAxisFiala.DateTime+axis3+Fiala

In this example the given dates are yyyy-01-01 so the numbers forming the data series appear as integer values. I am using a conversion function to convert each DateTime value down to milliseconds into an double value considering the leapyears. May be You can use the conversion function to get a certain datetime number:

        static double DateToNumber(DateTime date)
        {
            int[] DaysToMonth = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
            int Year = date.Year;
            bool IsLeapYear = ((Year % 4 == 0) && (Year % 100 != 0)) || (Year % 400 == 0);
            int LeapDay = IsLeapYear && (date.Month > 2) ? 1 : 0;
            long SecondsPerYear = (365+LeapDay) * 24 * 60 * 60;
            double TimeInYears = Year + (date.Millisecond*1.0/1000 + date.Second + date.Minute * 60 + date.Hour * 3600 + (date.Day-1 + LeapDay + DaysToMonth[date.Month-1]) * 3600 * 24)/SecondsPerYear;
            return TimeInYears;
        }

It works exactly up to yyyy-12-31 24:59:59.999

Some of my DateTime experiments:

Example1:http://austr.iam.at/?cmd=cat&arg=153
Example2:http://austr.iam.at/?cmd=cat&arg=86 

(You can use all of these functions.)

ryoujr wrote at 2013-07-23 23:06:

raphay wrote at 2013-07-24 13:29:

etrgyphon wrote at 2014-01-03 16:21:

objo wrote at 2014-01-07 22:03:

heromyth wrote at 2012-05-09 04:29:

It's using a TextLabel to implement the tracker. It's just better than nothing.

diff -r 93124cd413d6 Source/OxyPlot.WindowsForms/Plot.cs
--- a/Source/OxyPlot.WindowsForms/Plot.cs    Thu Apr 26 21:11:20 2012 +0200
+++ b/Source/OxyPlot.WindowsForms/Plot.cs    Wed May 09 10:21:11 2012 +0800
@@ -223,6 +223,7 @@
         /// </summary>
         public void HideTracker()
         {
+            m_label.Visible = false;
         }
 
         /// <summary>
@@ -381,8 +382,20 @@
         /// </param>
         public void ShowTracker(TrackerHitResult data)
         {
-            // not implemented for WindowsForms
+            if (m_label == null)
+            {
+                m_label = new Label();
+                m_label.Parent = this;
+                m_label.BackColor = Color.LightSkyBlue;
+                m_label.AutoSize = true;
+            }
+
+            m_label.Text = data.ToString();
+            m_label.Top = (int)data.Position.Y - this.Top;
+            m_label.Left = (int)data.Position.X - this.Left;
+            m_label.Visible = true;
         }
+        private Label m_label;
 
         /// <summary>
         /// The show zoom rectangle.

objo wrote at 2012-05-11 00:17:

thanks for the code, I will add this soon! I agree that a Label is better than nothing :)

objo wrote at 2014-02-02 20:57:

chage wrote at 2014-03-26 19:27:

objo wrote at 2014-03-26 20:07:

chage wrote at 2014-03-26 21:05:

oriches wrote at 2014-05-08 17:33:

objo wrote at 2014-05-08 18:36:

oriches wrote at 2014-05-08 18:57:

oriches wrote at 2014-05-08 19:30:

objo wrote at 2014-05-10 23:19:

CatalinMurariu wrote at 2013-10-25 11:06:

objo wrote at 2013-10-25 22:35:

CatalinMurariu wrote at 2013-10-28 15:19:

everytimer wrote at 2013-07-22 22:48:

everytimer wrote at 2013-07-22 22:59:

          if (this.image == null)
            {
                var pixels = new OxyColor[m, n];
                for (int i = 0; i < m; i++)
                {
                    for (int j = 0; j < n; j++)
                    {
                        var c = OxyColor.FromHsv(Matrix[i,j], 0.8, 0.8);

                        //pixels[i, j] = Math.Abs(this.Matrix[m - 1 - i, j]) <= this.ZeroTolerance ? OxyColors.Transparent : this.NotZeroColor;
                        pixels[i, j] = Math.Abs(this.Matrix[m - 1 - i, j]) <= this.ZeroTolerance ? OxyColors.Transparent : c;
                 
                    }
                }

                this.image = OxyImage.PngFromArgb(pixels);
            }