Clarence GUO <clarence.guo...@gmail.com> has asked for review: Bug 122822: Correct viewing of XY-, Column- and Line-Charts limited to 10000 records + 1 Heading row https://issues.apache.org/ooo/show_bug.cgi?id=122822
Attachment 81359: Fix patch https://issues.apache.org/ooo/attachment.cgi?id=81359&action=edit ------- Additional Comments from Clarence GUO <clarence.guo...@gmail.com> The root cause of this defect is in fix of 121058, only some points were picked up in order to save loading time and memory for tens of thousands of data points. All data points were divided into many small groups and only picked min and max points from one group. The reason why only picked min and max points instead of using a regular distance is, for example, if there is a column or a line chart, most of data points are around max value 100 and min value 10, only if we pick max and min values from one group, the chart can keep it's original outline. But if we use a regular distance, we might only get some mid-value(for example 50) of the chart and will miss the chart outline. But the mechanism never consider scatter chart or bubble chart which have multiple data sequence in one series. For example, for scatter chart, one series has two sequence, x values and y values. A x value and a y value must be a pair. Then when pick x values, a min and a max values were picked. When pick y values, another min and max values were picked. However, the picked min and max x values probably are not in one pair of min and max y values. For example, index of min and max x values are 10 and 40. It should get No. 10 and No. 40 values from y values, but it might get No. 30 and No. 35. So in this case, the chart data are totally corrupt. That is the root cause. My fix will roll back code of 121058 in ScChart2DataSequence::getNumericalData and add new fix code in ScChart2DataSequence::BuildDataCache(), then wrong axes data label issue mentioned by Regina Henschel can be fixed. And new code will use regular distance to pick up points then problem for scatter chart and other charts which have multiple sequences in one series can be fixed. If the distance is small enough, fore-mentioned chart outline issue is no problem. So I use 5 as regular distance. --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@openoffice.apache.org For additional commands, e-mail: dev-h...@openoffice.apache.org
