How can I adjust the Line Opacity settings in Google Charts?

Within my Google Charts project, I have successfully implemented a feature that changes the color of a line halfway through a graph based on certain conditions using a dataView. Here is the code snippet demonstrating this functionality:

var dataView = new google.visualization.DataView(data);

dataView.setColumns([
    // reference existing columns by index
    0, 1,
    // add function for line color
    {
        calc: function (data, row) {
            var colorDown = '#ff9900';
            var colorUp = '#27B291';
            var opacity = 'opacity, 0.2;';
            var currentdate = new Date();
            var givendate = new Date(row.getValue);

            if (data.getValue(row, 0) > currentdate) {
                return colorDown;
            } else {
                return colorUp;
            }
        },
        type: 'string',
        role: 'style'
    }
]);

I am now seeking a way to also adjust the line opacity conditionally. Despite trying various methods, I have been unable to find a solution. Any guidance or suggestions would be greatly appreciated. Thank you.

javascriptcsschartsgoogle-visualization

Answer №1

Utilizing the style column role allows you to blend color and opacity in the following manner...

'color: #ff9900;opacity: 0.2;'

Take a look at the snippet below for a demonstration of this concept:

google.charts.load('current', {
  packages: ['corechart']
}).then(function () {
  var data = new google.visualization.arrayToDataTable([
    ['x', 'y'],
    [new Date(2018, 6, 15), 2924],
    [new Date(2018, 6, 16), 2381],
    [new Date(2018, 6, 17), 2489],
    [new Date(2018, 6, 18), 2235],
    [new Date(2018, 6, 19), 2155],
    [new Date(2018, 6, 20), 2844],
  ]);

  var container = document.getElementById('chart_div');
  var chart = new google.visualization.LineChart(container);

  var dataView = new google.visualization.DataView(data);
  dataView.setColumns([
    // reference existing columns by index
    0, 1,
    // add function for line color
    {
      calc: function (data, row) {
        var colorDown = 'color: #ff9900;';
        var colorUp = 'color: #27B291;';
        var opacity  = 'opacity: 0.2;'
        var currentdate = new Date();
        var givendate = new Date(row.getValue)

        if (data.getValue(row, 0) > currentdate) {
          return colorDown + opacity;
        } else {
          return colorUp + opacity;
        }
      },
      type: 'string',
      role: 'style'
    }
  ]);

  chart.draw(dataView, {
    legend: {
      position: 'none'
    }
  });
});
<script src="https://www.gstatic.com/charts/loader.js"></script>
<div id="chart_div"></div>

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