I can add a single constant value reference line for a numeric field.

Description

A horizontal or vertical line used for reference vs the data visualized

Example user story

When I was doing analyses for demo week, I wanted to add lines to the chart showing when different events were so that people could easily pick them out in the graph. Here’s an example of what I ended up building in Google Sheets: https://www.loom.com/share/755c8cad166c48bf86bcaf855b6f66aa

Another example: Each quarter, we set goals for our KPIs. These are targets that we want to hit by the end of hte quarter. I really want to add these constant values to my chart so that we can see how we’re progressing towards our goal.

Sketch

Here’s a sketch of how this could work in Miro: https://miro.com/app/board/uXjVP9qJWMk=/?share_link_id=624411838486

Acceptance Criteria

• I’m able to plot lines that are constant values on my chart
• These lines can be vertical or horizontal
• I can only add reference lines to numeric series in my chart.
• I can only add reference lines based on the fields that are selected to plot on the x-axis or y-axis in my chart (i.e. I can’t use fields in my results table that aren’t in my chart and I can’t use fields that are selected in groups).
• I can only add one reference line to my plot

[ZeRego]

For reference, echarts mark lines configuration: https://echarts.apache.org/en/option.html#series-line.markLine

Example of vertical and horizontal line:

        markLine: {
          silent: true,
          lineStyle: {
            color: '#333'
          },
          data: [
            {
              yAxis: 300
            },
            {
              xAxis: '2014-08-01'
            },
          ]
        }

[olly-writes-code]

@olly-writes-code I’ve updated the spec on the issue. Let me know if this would solve your problem!

agreed with the spec changes. Thanks @TuringLovesDeathMetal !