I'm drawing a line marker onto a chart to show upper and lower boundaries. Occasionally my lower boundary is zero, which happens to be where the X-axis is graphed. When this happens I'm unable to see the line marker anymore (the x-axis seems to overwrite this). I've been digging through the AnyChart xml pages but no luck, any ideas?
Are you using a marker series on your chart, or just simply a line? If you use a marker, then it might make it easier to highlight the boundaries with values of zero. If it's easiest, just place a testcase on apex.oracle.com, update this thread with login credentials, and I'd be happy to take a look.
Thanks for supplying your XML. I've gone through the AnyChart XML reference, and played around with the axis_marker attributes, and I think your best bet is to increase the thickness of the trend line in order to make it stand out from the x-axis line. So based upon the XML you provided, I would change thickness="2" to something like 5 (or higher, depending on how the chart looks), and also look at the option of labelling the trend line, to ensure it stands out to the user of the chart e.g. http://apex.oracle.com/pls/apex/f?p=36648:74. Using a line colour that stands out from the series lines would also be beneficial, which is something I'm sure you've already tried.