Plotting a datapoint or star at a specific location on a chart

General
1

Hi all,

I have a number of datasets displayed as a linear chart in a desktop application. Occasionally, I’d like to star a particular datapoint or make it stand out as a specific event has happened.

I can create another dataset and use zero for the majority of the data and a higher value for my events, but this shows a row of stars at zero which is not ideal.

Any suggestions on something that looks good?

2

Hi James, you can use the new Paint events so you can decide what to paint for the data points. For example, nothing for that 0.0 values: More Control Over Your Charts – Xojo Programming Blog

1 Like
3

Thanks very much Javier.

The x and y points are relative to the parent control I think? Does this mean I’d need to keep track of and redraw as I scroll the plot?

4

Just draw in the received Graphic context (0,0 = upper left corner). The x, y values are relative to the upper-left corner of the chart itself, just in case you want to draw or keep track of these coordinates for the value for “anything else” over the chart too :slightly_smiling_face: