chart line series problem

Hi there, I thought I don't need to bother you again before our release, but there is something to bother us, the following is our data, (I am using 5.0 Aug. 29 2013 nightly build)

 2009-10-01T00:00:00                                           0
                 2010-02-01T00:00:00                                           0
                 2010-03-01T00:00:01                                    1028.699
                 2010-04-01T00:00:00                                    714.6647
                 2010-05-01T00:00:01                                    650.6284
                 2010-06-01T00:00:01                                    746.3483
                 2010-07-01T00:00:02                                    728.0347
                 2010-08-01T00:00:00                                    773.0098
                 2010-09-01T00:00:02                                    680.3707
                 2010-10-01T00:00:02                                    746.8663
                 2010-11-01T00:00:02                                    727.5387
                 2010-12-01T00:00:02                                    724.0535
                 2011-01-01T00:00:00                                    738.6022
                 2011-02-01T00:00:02                                    682.7933
                 2011-03-01T00:00:05                                    667.5941
                 2011-04-01T00:00:05                                    705.6566
                 2011-05-01T00:00:00                                     666.594
                 2011-06-01T00:00:00                                    695.5729
                 2011-07-01T00:00:00                                     690.165
                 2011-08-01T00:00:05                                    704.1197
                 2011-09-01T00:00:05                                     738.675
                 2011-10-01T00:00:05                                    709.3771
                 2011-11-01T00:00:00                                    747.4553
                 2011-12-01T00:00:00                                    728.8362
                 2012-01-01T00:00:05                                    742.6489
                 2012-02-01T00:00:05                                     738.262
                 2012-03-01T00:00:05                                    774.4565
                 2012-04-01T00:00:00                                    756.9796
                 2012-05-01T00:00:10                                    779.8888
                 2012-06-01T00:00:05                                     744.011
                 2012-07-01T00:00:05                                    802.5771
                 2012-08-01T00:00:00                                    791.9071
                 2012-09-01T00:00:10                                    790.5841
                 2012-10-01T00:00:00                                    794.5129
                 2012-11-01T00:00:00                                    818.6984
                 2012-12-01T00:00:10                                    878.2062
                 2013-01-01T00:00:10                                    826.9865
                 2013-02-01T00:00:00                                    864.5897
                 2013-03-01T00:00:00                                    806.4723
                 2013-04-01T00:00:00                                    832.0203
                 2013-05-01T00:00:10                                    827.3923
                 2013-06-01T00:00:10                                    816.1713
                 2013-07-01T00:00:10                                    820.4809
                 2013-08-01T00:00:10                                     795.875
                 2013-09-01T00:00:00                                    817.3912
                 2013-10-01T00:00:10                                    801.7839
                 2013-11-01T00:00:10                                    805.2324
                 2013-12-01T00:00:00                                    795.0826
                 2014-01-01T00:00:00                                    785.5057
                 2014-02-01T00:00:10                                    859.4472
                 2014-03-01T00:00:10                                    819.5659
                 2014-04-01T00:00:10                                    779.1792
                 2014-05-01T00:00:00                                    753.1212
                 2014-06-01T00:00:10                                    738.7368
                 2014-07-01T00:00:00                                    736.2319
                 2014-08-01T00:00:10                                    718.5393
                 2014-09-01T00:00:00                                    712.1502
                 2014-10-01T00:00:00                                    712.3149
                 2014-11-01T00:00:10                                    702.3903
                 2014-12-01T00:00:00                                    692.6325
                 2015-01-01T00:00:00                                     735.845
                 2015-02-01T00:00:10                                    779.2166
                 2015-03-01T00:00:21                                    739.4536
                 2015-04-01T00:00:10                                    748.4839
                 2015-05-01T00:00:00                                     756.306
                 2015-06-01T00:00:21                                     738.691
                 2015-07-01T00:00:00                                    703.6974
                 2015-08-01T00:00:21                                    706.4016
                 2015-09-01T00:00:00                                    690.1078
                 2015-10-01T00:00:21                                    729.4187
                 2015-11-01T00:00:00                                    689.5579
                 2015-12-01T00:00:21                                    698.0101
                 2016-01-01T00:00:00                                    674.2631
                 2016-02-01T00:00:21                                    0.348421
                 2016-03-01T00:00:21                                   0.3421059
                 2016-04-01T00:00:00                                     378.238
                 2016-05-01T00:00:21                                    507.2438
                 2016-06-01T00:00:00                                    516.7316
                 2016-07-01T00:00:21                                    545.0325
                 2016-08-01T00:00:00                                    542.0225
                 2016-09-01T00:00:21                                    554.2258
                 2016-10-01T00:00:00                                    556.6138
                 2016-11-01T00:00:00                                    542.9581
                 2016-12-01T00:00:21                                    544.7883
                 2017-01-01T00:00:00                                     533.483
                 2017-02-01T00:00:21                                    545.3625
                 2017-03-01T00:00:00                                    543.8416
                 2017-04-01T00:00:21                                    542.7737
                 2017-05-01T00:00:21                                    549.6667
                 2017-06-01T00:00:21                                    558.5254
                 2017-07-01T00:00:21                                    549.9512
                 2017-08-01T00:00:21                                    541.3077
                 2017-09-01T00:00:00                                    540.9684
                 2017-10-01T00:00:21                                     541.125
                 2017-11-01T00:00:00                                    535.5795
                 2017-12-01T00:00:00                                    542.2462
                 2018-01-01T00:00:00                                    533.3193
                 2018-02-01T00:00:21                                   0.1929546
                 2018-03-01T00:00:21                                    437.2094
                 2018-04-01T00:00:21                                    458.5854
                 2018-05-01T00:00:21                                     463.602
                 2018-06-01T00:00:21                                    465.2056
                 2018-07-01T00:00:21                                    458.7267
                 2018-08-01T00:00:21                                    465.7718
                 2018-09-01T00:00:21                                    463.6126
                 2018-10-01T00:00:21                                    469.6208
                 2018-11-01T00:00:00                                       470.8
                 2018-12-01T00:00:21                                    464.6668
                 2019-01-01T00:00:21                                    468.6253
                 2019-02-01T00:00:00                                    475.5128
                 2019-03-01T00:00:21                                    468.5459
                 2019-04-01T00:00:00                                    471.8867
                 2019-05-01T00:00:21                                    470.0401
                 2019-06-01T00:00:21                                    469.7159
                 2019-07-01T00:00:21                                    471.2591
                 2019-08-01T00:00:21                                    472.5539
                 2019-09-01T00:00:21                                    473.1226
                 2019-10-01T00:00:00                                    471.6345

X axis is time and axis is float/double values (2nd column) and we don't have any value that is < 0. But when we plot the data out, around the point of (2018-02-01T00:00:21, 0.1929546) it shows you smaller than 0. It may be OK for general use, but as scientist, this is big problem, do we have a way to avoid that?

See the attached image.

Thanks, Gordon

Hello Gordon

Good spotting. The default style of the lines are too sharp. You can resolve this by setting the StrokeLineJoin property of the line to Round. This can be setup in your custom LineStyle.

Jason Fauchelle

Thanks Jason,

I tried the following:

Style myStyle = new Style(typeof(LineSeries));
            Setter joinPoint = new Setter(Shape.StrokeLineJoinProperty, PenLineJoin.Round);
            myStyle.Setters.Add(joinPoint);
            series.LineStyle = myStyle;

The problem still exists. Did I do something wrong. When we zoom it to some extends, the problem is gone.

Gordon

Hello Gordon

This code looks correct.

If you zoom in, is the problem resolved permanently? - even if you go back to the previous zoom? If so, then there is probably an issue with the order of the LineStyle being applied. This issue will be resolved in the next nightly build. This is only 1 line of code changed since your current build so there is no risk of breaks.

If this is not the case, then I can only think you may be overriding this LineStyle somewhere else in your code?

Also make sure you set the StrokeThickness on this style to something like "2", otherwise you'll get really thin lines.

You could use a tool such as "Snoop" to check the properties on the rendered lines to make sure the StrokeLineJoin property has been set.

Jason Fauchelle

Hi Jason,

1) To answer your first part, after zoom and reset to 100% the problem will appear again.

2) You are right, I override the style in other place when I tried to set the width of the path. Now it seemed problem is solved.

Thanks

Gordon