Line disappeared when Zoom - Disaster Zoom problem when both x and y with double values

Hi There,

You really need to fix the Zoom problem, since some of the lines disappeared after zoom.

If x-axis is DateTime, it will be ok.

If both x and y are doubles, most of the lines disappeared for the line series.

not sure if this is helpful, on Y axis, we use reverse order and put x-axis on top.

See the image without zooming zoomlineseries.jpg. If we zoom between x(0.4, 0.5) and y(50, 40) by click and drag starting coordinate(40, 0.4) to (50, 0.5), then all the line series disappeared, only the scatter series left as in screenshot zoomLineSeriesProblem.jpg.

Here are 2 sets of data for 2 lines out of 54 lines:

12.5, 1
13.75, 0.9899164
16.25, 0.9869058
18.75, 0.8585755
21.25, 0.7759986
23.75, 0.7756664
26.25, 0.7661863
28.75, 0.7657001
31.25, 0.7619707
33.75, 0.7584782
36.25, 0.7116699
38.75, 0.4722853
41.25, 0.4358107
43.75, 0.4317885
46.25, 0.421797
48.75, 0.4217027
51.25, 0.4131106
53.75, 0.05178207
56.25, 0.02674341
58.75, 0.02627711
59.75, 0
and
12.5, 1
13.75, 0.9886928
16.25, 0.9867439
18.75, 0.8688155
21.25, 0.7666537
23.75, 0.7662766
26.25, 0.7568198
28.75, 0.7564678
31.25, 0.7556514
33.75, 0.7549938
36.25, 0.7372535
38.75, 0.5018939
41.25, 0.4657274
43.75, 0.4539731
46.25, 0.4437771
48.75, 0.4436772
51.25, 0.434152
53.75, 0.0339985
56.25, 0.0063429
58.75, 0.0059568

Please fix them asap.

Gordon

Hello Gordon

Thanks for the repro data. This issue was caused by the data being backwards (from right to left along the X axis). One of the performance optimizations (One from version 1.0, not one of the recent improvements) expects the data to flow from left to right. This will be resolved in the next nightly build. For charts with a large amount of data, it is recommended (but not required) to have the data flow from left to right. If you have a problem with large charts with backwards data, let me know. Any backwards chart with less than 500 points per series will be perfectly fine.

Jason Fauchelle