Flower Chart

A radar column chart where the columns fill only the middle of each slice, so they stand apart like petals. Here, two coffees scored on eight tasting notes.

  • Try it:
  • Hover a petal to read its score
  • Click a coffee in the legend to hide it
Get the code JavaScript JSON
About this chart

When a flower chart works

A flower chart compares two or three profiles across the same criteria, petal by petal. Unlike a filled radar, the petals don’t cover each other, so every score stays visible. It reads best when the scores share one scale, here 0 to 10.

Good for

  • Tasting notes, reviews and ratings
  • Two products or players side by side
  • Profiles where every criterion counts on its own

Think twice when

  • More than three profiles: the petals get thin
  • Criteria on different scales
  • Exact differences: a grouped bar chart lines them up
For developers

Get the code.

Built with amCharts 5, a JavaScript library. The JavaScript includes your theme and renderer (canvas or SVG); the JSON also follows the changes you make with the controls.

Docs:Radar chartRadar axesAxisRendererCircular referenceLegend
// Create root element
// https://www.amcharts.com/docs/v5/getting-started/#Root_element
var root = am5.Root.new("chartdiv");

// Set themes
// https://www.amcharts.com/docs/v5/concepts/themes/
root.setThemes([
  am5themes_Animated.new(root),
  am5themes_Responsive.new(root)
]);

// Data: two coffees scored from 0 to 10 on eight tasting notes (sample data)
// https://www.amcharts.com/docs/v5/charts/radar-chart/#Setting_data
var data = [{
  note: "Acidity",
  light: 8,
  dark: 3
}, {
  note: "Fruit",
  light: 8,
  dark: 2
}, {
  note: "Floral",
  light: 7,
  dark: 1
}, {
  note: "Sweetness",
  light: 6,
  dark: 5
}, {
  note: "Body",
  light: 4,
  dark: 8
}, {
  note: "Chocolate",
  light: 3,
  dark: 8
}, {
  note: "Nutty",
  light: 4,
  dark: 6
}, {
  note: "Bitterness",
  light: 2,
  dark: 8
}];

// Create chart
// https://www.amcharts.com/docs/v5/charts/radar-chart/
var chart = root.container.children.push(
  am5radar.RadarChart.new(root, {
    panX: false,    // no panning: a drag zooms in instead
    // a vertical layout puts the legend under the chart
    layout: root.verticalLayout,
    panY: false,
    wheelX: "panX", // a horizontal wheel or trackpad swipe pans...
    wheelY: "zoomX" // ...and the vertical wheel zooms in on the notes
  })
);

// each new series moves three colors on in the palette, so the two coffees don't take look-alike neighbors
chart.get("colors").set("step", 3);

// Add cursor
// https://www.amcharts.com/docs/v5/charts/radar-chart/#Cursor
var cursor = chart.set("cursor", am5radar.RadarCursor.new(root, {
  behavior: "zoomX" // drag around the circle to zoom in on a few notes
}));

cursor.lineY.set("visible", false); // no ring at the pointer's distance, just the line from the center

// Create axes and their renderers
// https://www.amcharts.com/docs/v5/charts/radar-chart/#Adding_axes
// The columns fill only the middle of each slice (from 20% to 80%), so they stand apart like petals
var xRenderer = am5radar.AxisRendererCircular.new(root, {
  cellStartLocation: 0.2,
  cellEndLocation: 0.8,
  minGridDistance: 20 // at least 20px between labels around the circle
});

xRenderer.labels.template.setAll({
  radius: 10 // the labels 10px outside the circle
});

var xAxis = chart.xAxes.push(
  am5xy.CategoryAxis.new(root, {
    maxDeviation: 0,                   // no panning past the first or last note
    categoryField: "note",
    renderer: xRenderer,
    tooltip: am5.Tooltip.new(root, {}) // shows the hovered note
  })
);

xAxis.data.setAll(data);

var yAxis = chart.yAxes.push(
  am5xy.ValueAxis.new(root, {
    min: 0,  // the scale runs from 0...
    max: 10, // ...to 10
    // the scale stays exactly 0 to 10 instead of being rounded out
    strictMinMax: true,
    renderer: am5radar.AxisRendererRadial.new(root, {})
  })
);

// Create series: one per coffee, side by side in each slice
// https://www.amcharts.com/docs/v5/charts/radar-chart/#Adding_series
function createSeries(name, field) {
  var series = chart.series.push(
    am5radar.RadarColumnSeries.new(root, {
      name: name,
      xAxis: xAxis,
      yAxis: yAxis,
      valueYField: field,
      categoryXField: "note"
    })
  );

  series.columns.template.setAll({
    tooltipText: "{name}: {valueY} of 10", // as "Light roast: 8 of 10"
    width: am5.percent(100)                // the two columns together fill the slice's middle, with no gap
  });

  series.data.setAll(data);

  series.appear(1000);
}

createSeries("Light roast", "light");
createSeries("Dark roast", "dark");


// Add legend: click a coffee to hide it
// https://www.amcharts.com/docs/v5/charts/radar-chart/#Legend
var legend = chart.children.push(am5.Legend.new(root, {
  centerX: am5.p50, // the legend's middle...
  x: am5.p50        // ...at the middle of the chart
}));
legend.data.setAll(chart.series.values);

// Animate chart
// https://www.amcharts.com/docs/v5/concepts/animations/#Initial_animation
chart.appear(1000, 100);

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