drakesmith wrote at 2013-01-20 17:39:

I have created an audio waveform plot for a .wav player application. So far, OxyPlot has been fantastic for that. I use a vertical line annotation whose X position is bound to the playback position to track media position within the waveform. The position is updated every 100mS and the cursor looks great. The problem is that changing LineAnnotation.X at that rate uses 100% CPU.

Is there a better way to create a vertical position marker? A custom tracker seems close, but I want the cursor to move independently of the mouse. I don’t need any text or fancy graphic or mouse interaction, just a thin vertical cursor that overlays the plot.

Thank you.

objo wrote at 2013-01-22 09:34:

Yes, the whole model will be redrawn when changing an annotation. Check that you are not invalidating the data, no need to refresh data bindings when changing an annotation. Also see the Performance section under documentation.

In WPF, you could draw the cursor line in a canvas overlay above the plot control - subscribe to the axis changed events and use the transform methods on the axes to get the correct positions.

drakesmith wrote at 2013-01-22 10:50:

Thanks objo, your recommendation to use a canvas overlay is a reasonable workaround.

I will document those details and submit them back to you for inclusion in your documentation if you so choose.

morty77 wrote at 2013-09-25 12:42:

<oxy:Plot Model="{Binding MyPlotModel}"/>

xmlns:oxy="clr-namespace:OxyPlot.Wpf;assembly=OxyPlot.Wpf"

loic_lopes wrote at 2013-09-25 14:29:

morty77 wrote at 2013-09-26 09:34:

objo wrote at 2013-09-26 10:00:

morty77 wrote at 2013-09-26 10:19:

morty77 wrote at 2013-09-26 10:38:

morty77 wrote at 2013-09-26 10:51:

aec wrote at 2012-08-21 14:52:

Hi,

I would like to create plot, which relys on a function rather than on data points. This plot should automatically be updated in case of a change of the x axis. For instance, this should be done when a user zooms out (or in).

Manually, I have done this with text boxes, where you type in xmin and xmax and the graph is updated via data binding. Maybe, it is possible to extend this idea by binding to the minimum and maximum of the x axis. But I don't know how to do this. Has anyone an idea how to tackle this problem?

objo wrote at 2012-08-21 15:46:

Subscribe to the AxisChanged event on the axis. The ActualMaximum and ActualMinimum values are updated before the event is raised, and these values can be used to update the limits of your function series. Then call PlotModel.Refresh(true) (since the plot data was modified) to update the plot. 

aec wrote at 2012-08-22 09:17:

Thank you, for your immediate response. I thnk, your solution works fine in case of a pure C# program. But what I like to have is a C#/WPF solution with MVVM pattern. That is, I have

1.) a model for the function f(x). The evaluation of this function yiels the Points and depends on the limits of x: XMin, XMax.

       public double XMin { get; set; }

       public double XMax { get; set; }

       public IList<DataPoint> Points{  get  {  return evaluatedPoints;  }  }

2.) a view model where OnPropertyChanged of the Points and the changed limit is raised.

       public IList<DataPoint> Points { get { return model.Points; } }

       public double XMax // same for XMin

       {

           get { return model.XMax; }

           set

           {

               model.XMax = value;

               OnPropertyChanged("XMax");

               OnPropertyChanged("Points");

          }

       }

3.) a WPF view where the axis properties are modified. With respect to XMax we have for instance

           <oxy:Plot.Axes>

               <oxy:LinearAxis Position="Bottom">

                   <oxy:LinearAxis.Maximum>

                       <Binding Mode="TwoWay"

                               Path="XMax"

                               Source="{StaticResource viewModel}"

                               UpdateSourceTrigger="PropertyChanged" />

                   </oxy:LinearAxis.Maximum>

               </oxy:LinearAxis>

           <oxy:Plot.Axes/>

The problem is that there is no dependency property for ActualMaximum and ActualMinimum. Of course, I could implement this. But I don't like this approach, because than I am modifying your library. As a consequence I have to do this modification for all future versions.

To this end, I would like to ask you, if you can do this?

objo wrote at 2012-08-24 09:12:

I think it could be possible to add an AxisChanged routed event on the OxyPlot.Wpf.LinearAxis. This could pass the events from the OxyPlot.LinearAxis. http://oxyplot.codeplex.com/workitem/9992

It should also be possible to make some read-only dependency properties for ActualMaximum/ActualMinimum, which may get change notifications every time the plot is changed (e.g. panned, zoomed or data changed). http://oxyplot.codeplex.com/workitem/9993

aec wrote at 2012-08-24 11:00:

Hi objo, that would be cool! I am looking forward to this feature!

steunissen wrote at 2011-07-19 10:49:

First I have to say I absolutely love this great tool !

And I have a question ;-)

When I am on a chart and I want to scroll down (the chart is in a listview) the chart zooms as well. But I want the chart to be fixed, thus disabling the zoom functionality... Can I do this ?

Sander.

objo wrote at 2011-07-19 13:43:

hi Sander, you can set IsZoomEnabled = false to each of your axes, I think this is what you need!

steunissen wrote at 2011-07-19 17:35:

objo wrote:

hi Sander, you can set IsZoomEnabled = false to each of your axes, I think this is what you need!

Ah, I found it...

I was defining my axes in wpf, but there is no IsZoomEnabled property available.

Now I define my axes in code and IsZoomEnabled is available.

The OxyPlot and OxyPlot.WPF namespaces have more or less different objects with identical names... I found that a bit confusing...

objo wrote at 2011-07-20 21:50:

Right, all properties are not yet available in the WPF/SL classes, but this is planned (I hope to be able to share the code on both platforms). I understand it can be a bit confusing with identical names and the two different ways to define the plots, but there are advantages with both methods, so I think it should be kept that way. 

Meyip wrote at 2013-04-02 07:25:

  //   [Example("ScatterSeries with random MarkerSize (n=1000)")]

            var plotModel1 = new PlotModel();
            plotModel1.Subtitle = "BinSize = 8";
            plotModel1.Title = "ScatterSeries with random MarkerSize (n=1000)";
            var linearAxis1 = new OxyPlot.Axes.LinearAxis();
            linearAxis1.Position = OxyPlot.Axes.AxisPosition.Bottom;
            plotModel1.Axes.Add(linearAxis1);
            var linearAxis2 = new OxyPlot.Axes.LinearAxis();
            plotModel1.Axes.Add(linearAxis2);
            var scatterSeries1 = new OxyPlot.Series.ScatterSeries();
            scatterSeries1.BinSize = 8;
            scatterSeries1.MarkerStrokeThickness = 0;
            scatterSeries1.Title = "Series 1";
            plotModel1.Series.Add(scatterSeries1);
            // return plotModel1;
       


            plot1.Model = plotModel1;

Meyip wrote at 2013-04-04 16:34:

chage wrote at 2013-06-13 18:41:

chage wrote at 2013-06-14 20:36:

typingcat wrote at 2012-10-11 06:56:

Hello.

When there are many plots, and their name is long, and the size of OxyPlot is small, legend overflows. It is drawn outside of OxyPlot, which makes my program look defective.

What options do I have? Can I make it not overflow outside of OxyPlot?

objo wrote at 2012-10-12 07:40:

Can you put the legends below the plot?

I added the issue http://oxyplot.codeplex.com/workitem/10009

huangzhqin wrote at 2014-05-20 19:03:

Gimly wrote at 2013-09-19 12:19:

objo wrote at 2013-09-20 09:05:

Gimly wrote at 2013-09-20 11:19:

LineAnnotation lineAnnotation = new LineAnnotation()
{
       Equation = (double x) => { return Math.Sin(x); },
       Type = LineAnnotationType.EquationY
};

objo wrote at 2013-09-20 11:27: