I have created a timespan axis graph that is the same as the example in the oxyplot monotouch examples app.

When the app goes to load the graph is freezes when running on an iphone 4. I have tested this with an iphone 5 and it runs perfectly. There is no error reported in the application output in xamarin studio. The app just completely freezes.

This also happens with the oxyplot monotouch examples app when selecting the timespan axis graph.

Any ideas why this is happening?

Liam

Liam,

Can you run instruments against your iPhone 4 and see where your app is spending all of its time?

-ben

Hi Ben

Thanks for your response.

I ran instruments with the time profiler but I am not too sure what I am looking for? Here is a link to the data from instruments https://www.dropbox.com/s/gahj6l53bl4dbnx/SportsEdgeInstruments.trace.zip

Are you able to confirm that you can run the timespan axis with an iPhone < 5?

Cheers
Liam

Liam,

I cannot confirm running on less than 5s and iPad 3...but my app does have an x-axis that is a date axis...I'm about to release a new version of code with OxyPlot in it. Thus if there is a major issue with the 4 I'm concerned.

Basically with Instruments I'm looking for where all the time is being spent. From your snapshot start at the top and keep hitting down arrows until the function that is using up all of the time is exposed.

Although I can't see exactly where the code is falling down, I can at least point you in the correct direction. From your Instruments after I clicked down through all of the calls:



TimeSpan axis correct? OxyPlot/Axes/TimeSpanAxis.cs line 173

protected override double CalculateActualInterval(double availableSize, double maxIntervalSize)

From Instruments it looks like the line 188 is just spinning

double nextInterval = goodIntervals.FirstOrDefault(i => i > interval);

I'd start poking around here with the debugger and see why that FirstOrDefault is never ending, or why it is being called so many times

The MonoTouch Demo won't build because of the above error. It seems that OxyColor isn't NULLable, but there are statements where it's compared to NULL, which crashes it. When I change this to oxycolor.Equals(null) it build, but crashes (obviously) when I'm trying to draw a graph.

I would expect since its not NULLable, there would be a value like 'undefined' which can be chosen instead, but this doesn't seem to be the case.

How can this be solved?

OxyColor was recently changed to a value type. Try to use OxyColors.Undefined where no color should be applied and OxyColors.Automatic where OxyPlot should suggest or a default color should be used. Let me know where to correct the MonoTouch code, I cannot compile this myself.

Hi I've fixed it, I tried to upload the changes thru the fork feature here on codeplex, but I couldn't figure out how to update it through SVN.
Anyways, replacing OxyPlot.MonoTouch\MonoTouchRenderContext.cs by this should fix it.

I replaced the

foo != null

by

!foo.Equals(OxyColors.Undefined)

etc.

I've ran the demo on an iOS simulator, and didn't run into any bugs,
although the resolution seems a kinda low compared to the MonoForAndroid version.

Thanks, I submited a fix with some modifications (using the OxyColor.IsVisible method), let me know if I broke something...

It's nearly correct, you just forgot to add the

using System;

I forgot to mention that I changed it, it's needed for the Math.PI at line 183.

For as far as I've tested it nothing else seems to be wrong, I'll let you know if I find something.

Edit:

• The Microsoft.CSharp Reference in ExampleLibraryMT.csproj should be removed, it gives an error, but the project runs fine without the reference.
• There is no 'splashscreen' for iPhone 5 resolution included.

Is it possible to plot against the Y-Axis with a Line Series?

So you might get a graph such as this one:
http://cmore.soest.hawaii.edu/cruises/operex/images/Backscatter-Data_full.gif

Hello,

I'm new at CodePlex and interested in OxyPlot.

Is there a way to zoom in by dragging a rectangle by mouse? By Zedgraph is it a basic setting.

Google shows me only this: http://searchcode.com/codesearch/view/28445967

But I have no idea to use it. Is it what I'm looking for?

Sorry for my poor English, I'm from Germany.

Kind Reguards
Christoph

By default you can use the wheel click to draw a rectangle and zoom in it. You can also do that on the axes, selecting the desired range that way.
Double wheel click autoadjusts the view. Good luck!

P.S.: WPF