{"id":1389,"date":"2026-07-27T03:14:24","date_gmt":"2026-07-27T03:14:24","guid":{"rendered":"https:\/\/www.vpascode.com\/vn\/docs\/uncategorized\/echarts-playbook\/theme-river-chart-continuous-categorical-flow-and-trend-analysis\/"},"modified":"2026-07-30T01:28:50","modified_gmt":"2026-07-30T01:28:50","slug":"theme-river-chart-continuous-categorical-flow-and-trend-analysis-guide","status":"publish","type":"ld_docs","link":"https:\/\/www.vpascode.com\/vn\/docs\/vpascode-docs\/echarts-playbook\/theme-river-chart-continuous-categorical-flow-and-trend-analysis-guide\/","title":{"rendered":"Theme River Chart: Continuous Categorical Flow and Trend Analysis"},"content":{"rendered":"

When tracking how multiple continuous categories evolve over time\u2014such as product sales across quarters, changing topic trends in news coverage, or media consumption patterns\u2014the Theme River Chart<\/strong> (a specialized form of a streamgraph) provides an intuitive, visually striking presentation. Unlike standard stacked area charts that anchor to a flat baseline, a Theme River chart flows horizontally around a central axis, creating an organic, river-like visualization where individual streams widen or shrink based on quantitative value shifts.<\/p>\n

The Mechanics of Theme River Charts<\/h2>\n

In Apache ECharts, Theme River charts use type: 'themeRiver'<\/code>. Instead of relying on traditional xAxis<\/code> and yAxis<\/code> configurations, the chart operates on a single horizontal singleAxis<\/code> with type: 'time'<\/code> or type: 'value'<\/code>. Data items are passed as array tuples formatted as [time, value, categoryName]<\/code>.<\/p>\n

1. Essential Setup<\/h3>\n

To create a basic Theme River chart, configure a singleAxis<\/code> of type 'time'<\/code>, specify type: 'themeRiver'<\/code> in your series, and supply your flow observations in the data<\/code> array:<\/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: 'axis',\r\n        axisPointer: {\r\n            type: 'line',\r\n            lineStyle: {\r\n                color: 'rgba(0,0,0,0.2)',\r\n                width: 1,\r\n                type: 'solid'\r\n            }\r\n        }\r\n    },\r\n    legend: {\r\n        data: ['Tech', 'Fashion', 'Sports']\r\n    },\r\n    singleAxis: {\r\n        top: 50,\r\n        bottom: 50,\r\n        axisTick: {},\r\n        axisLabel: {},\r\n        type: 'time',\r\n        axisPointer: {\r\n            animation: true,\r\n            label: { show: true }\r\n        },\r\n        splitLine: {\r\n            show: true,\r\n            lineStyle: {\r\n                type: 'dashed',\r\n                opacity: 0.5\r\n            }\r\n        }\r\n    },\r\n    series: [\r\n        {\r\n            type: 'themeRiver',\r\n            emphasis: {\r\n                itemStyle: {\r\n                    shadowBlur: 20,\r\n                    shadowColor: 'rgba(0, 0, 0, 0.3)'\r\n                }\r\n            },\r\n            data: [\r\n                ['2026-01-01', 12, 'Tech'],\r\n                ['2026-02-01', 24, 'Tech'],\r\n                ['2026-03-01', 32, 'Tech'],\r\n                ['2026-04-01', 18, 'Tech'],\r\n                ['2026-01-01', 15, 'Fashion'],\r\n                ['2026-02-01', 18, 'Fashion'],\r\n                ['2026-03-01', 10, 'Fashion'],\r\n                ['2026-04-01', 25, 'Fashion'],\r\n                ['2026-01-01', 8, 'Sports'],\r\n                ['2026-02-01', 12, 'Sports'],\r\n                ['2026-03-01', 28, 'Sports'],\r\n                ['2026-04-01', 20, 'Sports']\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
Theme River charts excel when monitoring complex multi-category events across long timeline sequences with custom tooltips and styled category palettes.<\/p>\n
1. Multi-Stream Media Volume Flow<\/h3>\n
Customizing stream colors with explicit palette mappings and custom axis tooltips turns raw event logs into a clean activity timeline:<\/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                    
const categories = ['Articles', 'Video Views', 'Podcast Plays', 'Social Shares'];\r\n\r\noption = {\r\n    title: {\r\n        text: 'Content Engagement Streams',\r\n        left: 'center'\r\n    },\r\n    tooltip: {\r\n        trigger: 'axis',\r\n        axisPointer: {\r\n            type: 'line',\r\n            lineStyle: {\r\n                color: '#333',\r\n                width: 1\r\n            }\r\n        }\r\n    },\r\n    legend: {\r\n        data: categories,\r\n        bottom: 10\r\n    },\r\n    color: ['#5470c6', '#91cc75', '#fac858', '#ee6666'],\r\n    singleAxis: {\r\n        top: '15%',\r\n        bottom: '20%',\r\n        type: 'time',\r\n        axisLine: { lineStyle: { color: '#ccc' } },\r\n        splitLine: { show: false }\r\n    },\r\n    series: [\r\n        {\r\n            type: 'themeRiver',\r\n            label: {\r\n                show: true,\r\n                position: 'left',\r\n                fontSize: 12\r\n            },\r\n            data: [\r\n                ['2026-01-01', 120, 'Articles'], ['2026-02-01', 200, 'Articles'], ['2026-03-01', 150, 'Articles'], ['2026-04-01', 80, 'Articles'],\r\n                ['2026-01-01', 60, 'Video Views'], ['2026-02-01', 140, 'Video Views'], ['2026-03-01', 220, 'Video Views'], ['2026-04-01', 310, 'Video Views'],\r\n                ['2026-01-01', 30, 'Podcast Plays'], ['2026-02-01', 45, 'Podcast Plays'], ['2026-03-01', 90, 'Podcast Plays'], ['2026-04-01', 110, 'Podcast Plays'],\r\n                ['2026-01-01', 180, 'Social Shares'], ['2026-02-01', 110, 'Social Shares'], ['2026-03-01', 70, 'Social Shares'], ['2026-04-01', 95, 'Social Shares']\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
  • Format Data Tuples Correctly:<\/strong> Each entry in the data<\/code> array must follow the exact order [date, value, categoryName]<\/code> for ECharts to properly slice and stack continuous streams.<\/li>\n
  • Limit Category Sprawl:<\/strong> Keep the number of distinct categories between 3 and 7. Too many streams make individual bands narrow and hard to trace across time points.<\/li>\n
  • Leverage singleAxis<\/code> Sizing:<\/strong> Adjust top<\/code> and bottom<\/code> on the singleAxis<\/code> property to control vertical padding and prevent outer stream labels from clipping against the container edges.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
    When tracking how multiple continuous categories evolve over time\u2014such as product sales across quarters, changing topic trends in news coverage, or media consumption patterns\u2014the Theme River Chart (a specialized form of a streamgraph) provides an intuitive, visually striking presentation. Unlike…<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":1254,"menu_order":24,"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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