Density scatter
Aggregate dense X/Y observations into spatial density.
Chart ID: densityScatter. Independent import: @revolist/charts/density-scatter.
Live example
Section titled “Live example”Loading chart…
Reading the chart
Section titled “Reading the chart”Inspect numeric concentration with aggregated cells. Dense groups become stronger cells, so a cell should not be mistaken for one original observation.
Data requirements
Section titled “Data requirements”Bind numeric X and Y series explicitly. Bubble marks also require a non-negative size series. Channels reference stable series IDs, not labels. Parallel channel arrays can describe independent scatter/bubble groups.
The roles below describe the chart's data contract. Generic category/value roles resolve from the dataset; explicitly bind specialized numeric roles as shown in the complete example.
| Data role | Field count |
|---|---|
category | 1 or more |
x | 1 |
y | 1 |
Download the complete sample data and settings (JSON). See Data & Configuration for mapping, null values, updates and lifecycle rules.
Create this chart
Section titled “Create this chart”Install the package using the installation guide, give the host an explicit height, and call createDensityScatterChart after the host mounts. This factory fixes the chart type to densityScatter.
<div id="chart" style="width: 100%; height: 450px;"></div>Complete runnable TypeScript example with sample data
import { createDensityScatterChart } from '@revolist/charts/density-scatter';
const container = document.getElementById('chart')!;const chart = await createDensityScatterChart({ container, "dataset": { "revision": 0, "source": "client", "categories": [ { "id": "preview-category-0", "label": "Alpha", "path": [ "Alpha" ], "labels": [ "Alpha" ], "depth": 1, "kind": "leaf" }, { "id": "preview-category-1", "label": "Beta", "path": [ "Beta" ], "labels": [ "Beta" ], "depth": 1, "kind": "leaf" }, { "id": "preview-category-2", "label": "Gamma", "path": [ "Gamma" ], "labels": [ "Gamma" ], "depth": 1, "kind": "leaf" }, { "id": "preview-category-3", "label": "Delta", "path": [ "Delta" ], "labels": [ "Delta" ], "depth": 1, "kind": "leaf" }, { "id": "preview-category-4", "label": "Epsilon", "path": [ "Epsilon" ], "labels": [ "Epsilon" ], "depth": 1, "kind": "leaf" } ], "series": [ { "id": "preview-series-0", "label": "Cost", "columnPath": [ "Cost" ], "labels": [ "Cost" ], "kind": "leaf", "prop": "preview-0" }, { "id": "preview-series-1", "label": "Revenue", "columnPath": [ "Revenue" ], "labels": [ "Revenue" ], "kind": "leaf", "prop": "preview-1" }, { "id": "preview-series-2", "label": "Volume", "columnPath": [ "Volume" ], "labels": [ "Volume" ], "kind": "leaf", "prop": "preview-2" } ], "values": [ [ 18, 34, 12 ], [ 31, 52, 28 ], [ 46, 41, 18 ], [ 58, 73, 42 ], [ 76, 61, 32 ] ], "analyticalFrame": { "fields": [ { "id": "pivot:category", "label": "pivot:category", "role": "dimension", "semanticType": "category" }, { "id": "pivot:series", "label": "pivot:series", "role": "dimension", "semanticType": "category" }, { "id": "preview-series-0", "label": "Cost", "role": "measure", "semanticType": "number", "sourceField": "preview-0" }, { "id": "preview-series-1", "label": "Revenue", "role": "measure", "semanticType": "number", "sourceField": "preview-1" }, { "id": "preview-series-2", "label": "Volume", "role": "measure", "semanticType": "number", "sourceField": "preview-2" } ], "observations": [ { "id": "[\"preview-category-0\",\"preview-series-0\"]", "dimensions": { "pivot:category": { "value": "Alpha", "label": "Alpha", "path": [ "Alpha" ], "labels": [ "Alpha" ] }, "pivot:series": { "value": "Cost", "label": "Cost", "path": [ "Cost" ], "labels": [ "Cost" ] } }, "measures": { "preview-series-0": 18 } }, { "id": "[\"preview-category-0\",\"preview-series-1\"]", "dimensions": { "pivot:category": { "value": "Alpha", "label": "Alpha", "path": [ "Alpha" ], "labels": [ "Alpha" ] }, "pivot:series": { "value": "Revenue", "label": "Revenue", "path": [ "Revenue" ], "labels": [ "Revenue" ] } }, "measures": { "preview-series-1": 34 } }, { "id": "[\"preview-category-0\",\"preview-series-2\"]", "dimensions": { "pivot:category": { "value": "Alpha", "label": "Alpha", "path": [ "Alpha" ], "labels": [ "Alpha" ] }, "pivot:series": { "value": "Volume", "label": "Volume", "path": [ "Volume" ], "labels": [ "Volume" ] } }, "measures": { "preview-series-2": 12 } }, { "id": "[\"preview-category-1\",\"preview-series-0\"]", "dimensions": { "pivot:category": { "value": "Beta", "label": "Beta", "path": [ "Beta" ], "labels": [ "Beta" ] }, "pivot:series": { "value": "Cost", "label": "Cost", "path": [ "Cost" ], "labels": [ "Cost" ] } }, "measures": { "preview-series-0": 31 } }, { "id": "[\"preview-category-1\",\"preview-series-1\"]", "dimensions": { "pivot:category": { "value": "Beta", "label": "Beta", "path": [ "Beta" ], "labels": [ "Beta" ] }, "pivot:series": { "value": "Revenue", "label": "Revenue", "path": [ "Revenue" ], "labels": [ "Revenue" ] } }, "measures": { "preview-series-1": 52 } }, { "id": "[\"preview-category-1\",\"preview-series-2\"]", "dimensions": { "pivot:category": { "value": "Beta", "label": "Beta", "path": [ "Beta" ], "labels": [ "Beta" ] }, "pivot:series": { "value": "Volume", "label": "Volume", "path": [ "Volume" ], "labels": [ "Volume" ] } }, "measures": { "preview-series-2": 28 } }, { "id": "[\"preview-category-2\",\"preview-series-0\"]", "dimensions": { "pivot:category": { "value": "Gamma", "label": "Gamma", "path": [ "Gamma" ], "labels": [ "Gamma" ] }, "pivot:series": { "value": "Cost", "label": "Cost", "path": [ "Cost" ], "labels": [ "Cost" ] } }, "measures": { "preview-series-0": 46 } }, { "id": "[\"preview-category-2\",\"preview-series-1\"]", "dimensions": { "pivot:category": { "value": "Gamma", "label": "Gamma", "path": [ "Gamma" ], "labels": [ "Gamma" ] }, "pivot:series": { "value": "Revenue", "label": "Revenue", "path": [ "Revenue" ], "labels": [ "Revenue" ] } }, "measures": { "preview-series-1": 41 } }, { "id": "[\"preview-category-2\",\"preview-series-2\"]", "dimensions": { "pivot:category": { "value": "Gamma", "label": "Gamma", "path": [ "Gamma" ], "labels": [ "Gamma" ] }, "pivot:series": { "value": "Volume", "label": "Volume", "path": [ "Volume" ], "labels": [ "Volume" ] } }, "measures": { "preview-series-2": 18 } }, { "id": "[\"preview-category-3\",\"preview-series-0\"]", "dimensions": { "pivot:category": { "value": "Delta", "label": "Delta", "path": [ "Delta" ], "labels": [ "Delta" ] }, "pivot:series": { "value": "Cost", "label": "Cost", "path": [ "Cost" ], "labels": [ "Cost" ] } }, "measures": { "preview-series-0": 58 } }, { "id": "[\"preview-category-3\",\"preview-series-1\"]", "dimensions": { "pivot:category": { "value": "Delta", "label": "Delta", "path": [ "Delta" ], "labels": [ "Delta" ] }, "pivot:series": { "value": "Revenue", "label": "Revenue", "path": [ "Revenue" ], "labels": [ "Revenue" ] } }, "measures": { "preview-series-1": 73 } }, { "id": "[\"preview-category-3\",\"preview-series-2\"]", "dimensions": { "pivot:category": { "value": "Delta", "label": "Delta", "path": [ "Delta" ], "labels": [ "Delta" ] }, "pivot:series": { "value": "Volume", "label": "Volume", "path": [ "Volume" ], "labels": [ "Volume" ] } }, "measures": { "preview-series-2": 42 } }, { "id": "[\"preview-category-4\",\"preview-series-0\"]", "dimensions": { "pivot:category": { "value": "Epsilon", "label": "Epsilon", "path": [ "Epsilon" ], "labels": [ "Epsilon" ] }, "pivot:series": { "value": "Cost", "label": "Cost", "path": [ "Cost" ], "labels": [ "Cost" ] } }, "measures": { "preview-series-0": 76 } }, { "id": "[\"preview-category-4\",\"preview-series-1\"]", "dimensions": { "pivot:category": { "value": "Epsilon", "label": "Epsilon", "path": [ "Epsilon" ], "labels": [ "Epsilon" ] }, "pivot:series": { "value": "Revenue", "label": "Revenue", "path": [ "Revenue" ], "labels": [ "Revenue" ] } }, "measures": { "preview-series-1": 61 } }, { "id": "[\"preview-category-4\",\"preview-series-2\"]", "dimensions": { "pivot:category": { "value": "Epsilon", "label": "Epsilon", "path": [ "Epsilon" ], "labels": [ "Epsilon" ] }, "pivot:series": { "value": "Volume", "label": "Volume", "path": [ "Volume" ], "labels": [ "Volume" ] } }, "measures": { "preview-series-2": 32 } } ], "matrixCells": [ { "categoryId": "preview-category-0", "seriesId": "preview-series-0", "observationId": "[\"preview-category-0\",\"preview-series-0\"]", "measureFieldId": "preview-series-0" }, { "categoryId": "preview-category-0", "seriesId": "preview-series-1", "observationId": "[\"preview-category-0\",\"preview-series-1\"]", "measureFieldId": "preview-series-1" }, { "categoryId": "preview-category-0", "seriesId": "preview-series-2", "observationId": "[\"preview-category-0\",\"preview-series-2\"]", "measureFieldId": "preview-series-2" }, { "categoryId": "preview-category-1", "seriesId": "preview-series-0", "observationId": "[\"preview-category-1\",\"preview-series-0\"]", "measureFieldId": "preview-series-0" }, { "categoryId": "preview-category-1", "seriesId": "preview-series-1", "observationId": "[\"preview-category-1\",\"preview-series-1\"]", "measureFieldId": "preview-series-1" }, { "categoryId": "preview-category-1", "seriesId": "preview-series-2", "observationId": "[\"preview-category-1\",\"preview-series-2\"]", "measureFieldId": "preview-series-2" }, { "categoryId": "preview-category-2", "seriesId": "preview-series-0", "observationId": "[\"preview-category-2\",\"preview-series-0\"]", "measureFieldId": "preview-series-0" }, { "categoryId": "preview-category-2", "seriesId": "preview-series-1", "observationId": "[\"preview-category-2\",\"preview-series-1\"]", "measureFieldId": "preview-series-1" }, { "categoryId": "preview-category-2", "seriesId": "preview-series-2", "observationId": "[\"preview-category-2\",\"preview-series-2\"]", "measureFieldId": "preview-series-2" }, { "categoryId": "preview-category-3", "seriesId": "preview-series-0", "observationId": "[\"preview-category-3\",\"preview-series-0\"]", "measureFieldId": "preview-series-0" }, { "categoryId": "preview-category-3", "seriesId": "preview-series-1", "observationId": "[\"preview-category-3\",\"preview-series-1\"]", "measureFieldId": "preview-series-1" }, { "categoryId": "preview-category-3", "seriesId": "preview-series-2", "observationId": "[\"preview-category-3\",\"preview-series-2\"]", "measureFieldId": "preview-series-2" }, { "categoryId": "preview-category-4", "seriesId": "preview-series-0", "observationId": "[\"preview-category-4\",\"preview-series-0\"]", "measureFieldId": "preview-series-0" }, { "categoryId": "preview-category-4", "seriesId": "preview-series-1", "observationId": "[\"preview-category-4\",\"preview-series-1\"]", "measureFieldId": "preview-series-1" }, { "categoryId": "preview-category-4", "seriesId": "preview-series-2", "observationId": "[\"preview-category-4\",\"preview-series-2\"]", "measureFieldId": "preview-series-2" } ] } }, "bindings": { "x": [ "preview-series-0" ], "y": [ "preview-series-1" ] }, "presentation": { "dataLabels": false }});
// When the host unmounts:// chart.destroy();Await updates before reading a snapshot or exporting. Call chart.destroy() when the host unmounts. See the live catalog to interact with this type.
Supported options
Section titled “Supported options”Set these fields in chartOptions. The option schema validates supported keys, ranges and choices; updating chartOptions replaces that authored object.
| Option | Default | Accepted values |
|---|---|---|
showGridLines | true | true or false |
markOpacity | 1 | 0.2 to 1; step 0.05 |
Titles, legends, theme and labels belong to presentation or the corresponding top-level setting. Axis, color, navigation and interaction support depends on the selected chart; see Data & Configuration.
Related charts
Section titled “Related charts”- Scatter — Compare two measures as points across categories.
- Bubble — Compare two measures while bubble area represents a third measure.
- Connected scatter — Show the ordered path between paired X/Y observations.
- Quadrant chart — Compare observations across four decision regions.