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Exercise/highcharts 2 #3

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Oct 6, 2022
8e3fd01
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Oct 6, 2022
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Oct 6, 2022
68d1c7a
Code refactor
Oct 6, 2022
d42de02
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Oct 7, 2022
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Oct 11, 2022
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1 change: 1 addition & 0 deletions highcharts-api/highcharts/2-polar-rings/index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@
<meta name="viewport" content="width=device-width, initial-scale=1">

<script src="https://code.highcharts.com/highcharts.js"></script>
<script src="https://code.highcharts.com/highcharts-more.js"></script>

</head>

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99 changes: 99 additions & 0 deletions highcharts-api/highcharts/2-polar-rings/main.js
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@@ -0,0 +1,99 @@
const generateRandomSeriesData = () =>
Array.from({ length: 3 }, () => Math.floor(Math.random() * 10));

const chart = Highcharts.chart('container', {
chart: {
type: 'column',
polar: true,
events: {
load() {
const yAxis = this.yAxis[0],
dataMax = yAxis.dataMax;

yAxis.update({
max: dataMax * 2,
});

yAxis.addPlotLine({
dashStyle: 'Dash',
value: dataMax * 1.5,
width: 2
});
},
render() {
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Nice! I have only two suggestions:

  • radius is not quite responsive this way (it changes via Math.random() every time when you redraw the chart, but it should only base on the value from the chart and scale relative to the chart ( toPixels() is a good choice 🥇 )
  • if you first check that the circle doesn't exist, you avoid a few code lines

Generally, you can simplify it following way:

    events: {
      render: function() {
        const chart = this,
          yAxis = this.yAxis[0];

        if (!chart.customCircle) {
          chart.customCircle = chart.renderer
            .circle()
            .attr({
              stroke: "blue",
              "stroke-width": 3,
              fill: "none"
            })
            .add();
        }

        chart.customCircle.attr({
          x: chart.yAxis[0].center[0] + chart.plotTop,
          y: chart.yAxis[0].center[1] + chart.plotLeft,
          r: chart.yAxis[0].toPixels(chart.yAxis[0].dataMax)
        });

      }
    }

const chart = this,
yAxis = chart.yAxis[0],
redCircle = chart.redCircle;

if (redCircle) {
redCircle.attr({
cx: chart.plotWidth / 2 + chart.plotLeft,
cy: chart.plotHeight / 2 + chart.plotTop,
r: yAxis.toPixels(
Math.random() * yAxis.dataMax * 2,
true
)
});
} else {
const renderedRedCircle = chart.renderer
.circle(
chart.plotWidth / 2 + chart.plotLeft,
chart.plotHeight / 2 + chart.plotTop,
100
)
.attr({
fill: 'white',
stroke: 'red',
'stroke-width': 2
})
.add();

chart.redCircle = renderedRedCircle;
}
},
},
},
title: {
text: undefined,
},
xAxis: {
categories: ['Jan', 'Feb', 'Mar']
},
yAxis: {
plotLines: [
{
width: 2,
color: 'green',
value: 15
}
]
},
series: [
{
name: 'Tokyo',
data: generateRandomSeriesData()
},
{
name: 'New York',
data: generateRandomSeriesData()
},
{
name: 'London',
data: generateRandomSeriesData()
},
],
plotOptions: {
series: {
dataLabels: {
enabled: true,
formatter() {
return this.y === this.series.yAxis.dataMax ? 'max' : '';
}
}
},
column: {
pointPadding: 0,
groupPadding: 0,
}
}
});