Making line straight in a line_chart using chartkick and removing dots

Question

I am using a very nice gem to create charts using Ruby on Rails. But I am struggling to make a line chart with straight lines connecting the dots. It always creates curves. I need straight lines. Also I want to know if someone knows how to remove the dots from the line. I could not find a way to do it.

Chartkick.options = {
  height: "300px",
  min: -5, 
  max: 10,
  discrete: true,
}

<% series_a = {"10" => -5, "11" => 9,"12" => 3,"13" => -1,"14" => 4,"15" => -2,"16" => -4} %>

<%= line_chart [{name: "Series A", data: series_a}] %>

Answer 1

So, you need to use 'library'. That lets you describe any preferences you have from Google charts, or from highcharts.

So you'll probably want to do something like the following:

<%= line_chart [{name: "Series A", data: series_a}], library: {curveType: "none", pointSize: 0}  %> 

Two things about the above line. Firstly, I do not normally use ruby-on-rails, so syntax may be off. Secondly, if you are using highcharts, it probably won't be {curveType: "none", pointSize:0} that is GoogleChart specific. For highcharts, you will have to lookup the highchart options, and look for something similar.