Been scratching my head over this for a couple of hours so I figure it's time to ask the big brains here.
I have a piece of test equipment. Every hour I update an XYgraph with the percentage of tests failed in the last hour. The x-axis shows time from 0:00 to 24:00. The user has asked if I could display a vertical line that shows the current time. (So at 09:00 there would be a vertical line displayed, and at 10:00 it would jump to that place on the x-axis, and so on, skipping back to 0:00 at midnight.
I feel this should be straightforward but I can't figure it out. Anyone got any tips or tricks to suggest, or links to previous posts about doing this?