{"id":1319,"date":"2026-07-27T01:59:09","date_gmt":"2026-07-27T01:59:09","guid":{"rendered":"https:\/\/www.vpascode.com\/cn\/docs\/uncategorized\/echarts-playbook\/nightingale-chart-polar-rose-proportions-and-radial-cycles\/"},"modified":"2026-07-30T01:27:24","modified_gmt":"2026-07-30T01:27:24","slug":"nightingale-chart-polar-rose-proportions-and-radial-cycles-guide","status":"publish","type":"ld_docs","link":"https:\/\/www.vpascode.com\/cn\/docs\/vpascode-docs\/echarts-playbook\/nightingale-chart-polar-rose-proportions-and-radial-cycles-guide\/","title":{"rendered":"Nightingale Chart: Polar Rose Proportions and Radial Cycles"},"content":{"rendered":"

When presenting cyclical data or visually striking categorical proportions, the Nightingale Chart<\/strong> (also known as a Polar Rose Chart or Coxcomb Chart) offers a compelling visual structure. Created by Florence Nightingale to map public health data, this chart encodes data values using sector radius length rather than angle span. By keeping slice angles identical while extending sector lengths outward, Nightingale charts turn cyclical or category metrics into distinct, high-impact radial designs.<\/p>\n

The Mechanics of Nightingale Charts<\/h2>\n

In Apache ECharts, a Nightingale chart uses the standard 'pie'<\/code> series type configured with the roseType<\/code> property. Setting roseType: 'radius'<\/code> instructs the engine to divide the circle into equal angular segments while sizing each sector’s outer radius based on its numerical value.<\/p>\n

1. Essential Setup<\/h3>\n

To construct a basic Nightingale chart, set roseType: 'radius'<\/code> inside a 'pie'<\/code> series object and supply your dataset:<\/p>\n

\r\n
\r\n ECharts<\/span>\r\n \r\n <\/path><\/path><\/svg>\r\n Edit ECharts in VPasCode<\/span>\r\n <\/a>\r\n <\/div>\r\n
\r\n 
option = {\r\n    tooltip: {\r\n        trigger: 'item',\r\n        formatter: '{a} \r\n{b}: {c} ({d}%)'\r\n    },\r\n    legend: {\r\n        top: '5%',\r\n        left: 'center'\r\n    },\r\n    series: [\r\n        {\r\n            name: 'Radius Mode',\r\n            type: 'pie',\r\n            radius: [20, 140],\r\n            center: ['50%', '55%'],\r\n            roseType: 'radius',\r\n            itemStyle: {\r\n                borderRadius: 5\r\n            },\r\n            data: [\r\n                { value: 40, name: 'Rose 1' },\r\n                { value: 38, name: 'Rose 2' },\r\n                { value: 32, name: 'Rose 3' },\r\n                { value: 30, name: 'Rose 4' },\r\n                { value: 28, name: 'Rose 5' },\r\n                { value: 26, name: 'Rose 6' },\r\n                { value: 22, name: 'Rose 7' },\r\n                { value: 18, name: 'Rose 8' }\r\n            ]\r\n        }\r\n    ]\r\n};<\/code><\/pre>                <\/div>\r\n                
\r\n                    \r\n                        <\/path><\/path><\/svg>\r\n                        Edit ECharts in VPasCode<\/span>\r\n                    <\/a>\r\n                <\/div>\r\n            <\/div>\r\n            \n
\"\"<\/p>\n
 <\/p>\n
Advanced Structural Techniques<\/h2>\n
You can customize the rose chart display mode to vary both angle and radius simultaneously, or hollow out the center for a rose-donut hybrid.<\/p>\n
1. Area Rose Type (Equal Angles vs. Scaled Angles)<\/h3>\n
Setting roseType: 'area'<\/code> keeps sector angles equal across all categories while scaling slice area rather than just radius:<\/p>\n            
\r\n                                
\r\n                    ECharts<\/span>\r\n                    \r\n                        <\/path><\/path><\/svg>\r\n                        Edit ECharts in VPasCode<\/span>\r\n                    <\/a>\r\n                <\/div>\r\n                                
\r\n                    
option = {\r\n    legend: {\r\n        top: 'bottom'\r\n    },\r\n    series: [\r\n        {\r\n            name: 'Area Mode',\r\n            type: 'pie',\r\n            radius: [30, 120],\r\n            center: ['50%', '45%'],\r\n            roseType: 'area',\r\n            data: [\r\n                { value: 30, name: 'Marketing' },\r\n                { value: 28, name: 'Sales' },\r\n                { value: 26, name: 'Development' },\r\n                { value: 24, name: 'Support' },\r\n                { value: 22, name: 'Design' },\r\n                { value: 20, name: 'Operations' }\r\n            ]\r\n        }\r\n    ]\r\n};<\/code><\/pre>                <\/div>\r\n                
\r\n                    \r\n                        <\/path><\/path><\/svg>\r\n                        Edit ECharts in VPasCode<\/span>\r\n                    <\/a>\r\n                <\/div>\r\n            <\/div>\r\n            \n
\"\"<\/p>\n
 <\/p>\n
Fine-Tuning Layout and Styling<\/h2>\n
Applying rounded outer tips and distinct borders gives polar rose charts a refined appearance on modern web pages.<\/p>\n
1. Rounded Rose Tips and Segment Borders<\/h3>\n
Use borderRadius<\/code> and white outline borders to separate adjacent radial petals cleanly:<\/p>\n            
\r\n                                
\r\n                    ECharts<\/span>\r\n                    \r\n                        <\/path><\/path><\/svg>\r\n                        Edit ECharts in VPasCode<\/span>\r\n                    <\/a>\r\n                <\/div>\r\n                                
\r\n                    
option = {\r\n    tooltip: {\r\n        trigger: 'item'\r\n    },\r\n    series: [\r\n        {\r\n            name: 'Department Impact',\r\n            type: 'pie',\r\n            radius: [40, 150],\r\n            center: ['50%', '50%'],\r\n            roseType: 'radius',\r\n            itemStyle: {\r\n                borderRadius: 8,\r\n                borderColor: '#ffffff',\r\n                borderWidth: 2\r\n            },\r\n            label: {\r\n                show: true,\r\n                formatter: '{b}: {c}'\r\n            },\r\n            data: [\r\n                { value: 1048, name: 'Engineering' },\r\n                { value: 735, name: 'Product' },\r\n                { value: 580, name: 'Marketing' },\r\n                { value: 484, name: 'Sales' },\r\n                { value: 300, name: 'Support' }\r\n            ]\r\n        }\r\n    ]\r\n};<\/code><\/pre>                <\/div>\r\n                
\r\n                    \r\n                        <\/path><\/path><\/svg>\r\n                        Edit ECharts in VPasCode<\/span>\r\n                    <\/a>\r\n                <\/div>\r\n            <\/div>\r\n            \n
\"\"<\/p>\n
 <\/p>\n
Strategic Best Practices<\/h2>\n
    \n
  • Mind the Visual Distortion:<\/strong> Because area scales exponentially with radius, larger values appear visually dominant on rose charts compared to standard bar charts. Use them when impact and visual engagement take priority.<\/li>\n
  • Keep an Inner Radius Hole:<\/strong> Always set an inner radius (e.g., [20, 140]<\/code>) so small sectors don’t shrink down to an unreadable sharp point at the absolute center.<\/li>\n
  • Position Legends Off Center:<\/strong> Place legends at the top or bottom edge to prevent radial petals from overlapping text as they extend outward.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
    When presenting cyclical data or visuall…<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":1254,"menu_order":10,"template":"","meta":{"inline_featured_image":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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