Area Chart - Gradient-Fill (Linear/Radial) Area

When creating an area chart you'd sometimes want to use a gradient-fill the area of the chart (linear or radial)

Linear-Gradient Fill (Top-to-Bottom)

Apply the following widget script:

function hexToRgbA(hex,opacity){
  var c;
  if (opacity < 0 || opacity > 1) throw new Error('Bad Opacity');
  if (!(/^#([A-Fa-f0-9]{3}){1,2}$/.test(hex))) throw new Error('Bad Hex');

  c = hex.substring(1).split('');
  if (c.length== 3){ c= [c[0], c[0], c[1], c[1], c[2], c[2]]; }
  c = '0x'+c.join('');
  return 'rgba('+[(c>>16)&255, (c>>8)&255, c&255].join(',')+',' + opacity + ')';
}

widget.on('processresult', function(widget,result) {
  seriesCount = widget.metadata.panel('values').items.length;
  
  for (let i = 0 ; i < seriesCount ; i++) {
    baseColor = widget.metadata.panel('values').items[i].format.color.color;
    gradientStopA = hexToRgbA(baseColor,0.5);
    gradientStopB = hexToRgbA(baseColor,0);

    result.result.series[i].fillColor = {
      linearGradient: {x1: 0, y1: 0, x2: 0, y2: 1 },
      stops: [
        [0, gradientStopA],
        [1, gradientStopB]
      ]
    }
  }
})

Before	After

Linear-Gradient Fill (Side-to-Side)

Apply the following widget script:

function hexToRgbA(hex,opacity){
  var c;
  if (opacity < 0 || opacity > 1) throw new Error('Bad Opacity');
  if (!(/^#([A-Fa-f0-9]{3}){1,2}$/.test(hex))) throw new Error('Bad Hex');

  c = hex.substring(1).split('');
  if (c.length== 3) { c= [c[0], c[0], c[1], c[1], c[2], c[2]]; }
  c = '0x'+c.join('');
  return 'rgba('+[(c>>16)&255, (c>>8)&255, c&255].join(',')+',' + opacity + ')';
}

widget.on('processresult', function(widget,result) {
  seriesCount = widget.metadata.panel('values').items.length;

  for (let i = 0 ; i < seriesCount ; i++) {
    baseColor = widget.metadata.panel('values').items[i].format.color.color;
    gradientStopA = hexToRgbA(baseColor,0);
    gradientStopB = hexToRgbA(baseColor,0.7);

    result.result.series[i].fillColor = {
      linearGradient: { x1: 1-i%2, y1: 0, x2: i%2, y2: 0 },
      stops: [
        [0, gradientStopA],
        [1, gradientStopB]
      ]
    }
  }
})

Before	After

Radial-Gradient Fill (In-to-Out)

Apply the following widget script:

function hexToRgbA(hex,opacity) {
  var c;
  if (opacity < 0 || opacity > 1) throw new Error('Bad Opacity');
  if (!(/^#([A-Fa-f0-9]{3}){1,2}$/.test(hex))) throw new Error('Bad Hex');

  c = hex.substring(1).split('');
  if (c.length== 3){ c= [c[0], c[0], c[1], c[1], c[2], c[2]]; }
  c = '0x'+c.join('');
  return 'rgba('+[(c>>16)&255, (c>>8)&255, c&255].join(',')+',' + opacity + ')';
}

widget.on('processresult', function(widget,result) {
  seriesCount = widget.metadata.panel('values').items.length;

  for (let i = 0 ; i < seriesCount ; i++) {
    baseColor = widget.metadata.panel('values').items[i].format.color.color;
    gradientStopA = hexToRgbA(baseColor,0.7);
    gradientStopB = hexToRgbA(baseColor,0);

    result.result.series[i].fillColor = {
      radialGradient: {cx: 0.5, cy: 1, r: 0.7},
      stops: [
        [0, gradientStopA],
        [1, gradientStopB]
      ]
    }
  }
})

Before	After