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 Intersection with X - axis |
| Posted by Alejandro on May-19-2022 22:23 |
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Hi everyone, I'm working with CD in PHP, my programming skills are not too high, I need to find the way to draw vertical lines (xMark) in the point where graph finds intersection with xAxis (where the plotting crosses from above 0 (Y) to below 0 (Y), for example:
Thank you in advance!!
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| Re: Intersection with X - axis |
| Posted by Peter Kwan on May-20-2022 01:11 |
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Hi Alejandro,
To find the zero crossing point, you do not need ChartDirector. You can write some code to scan your data to find the zero crossing point.
First, you need to define what is the zero crossing. For example, if the data are *(10 5, 2, -3, -7), then it is obvious the zero crossing point is between 2 and -3 and can simply be determined by interpolation. However, if the data are (100, 99, 0, 0, 0, 0, 0, 0, -7), exact where is the zero crossing point(s)? This depends on how you define zero crossing.
Once you define what is meant by "zero crossing" for all the possible cases, you can write PHP code scan your data to find the zero crossing points. You can then ask ChartDirector to add them to the chart using Axis.addMark.
Hope this can help.
Regards
Peter Kwan |
| Re: Intersection with X - axis |
| Posted by Alejandro on May-20-2022 04:05 |
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| Thank you very much |
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