Calendar Heatmap Chart
Display data density across a calendar year, similar to GitHub contribution graphs. Each cell represents a day, with color intensity showing the value.
Installation
dotnet add package Lumeo.Charts
One-time app setup (AddLumeo(), CSS & JS) is covered in the
installation guide.
Usage
@using Lumeo <CalendarHeatmapChart />
Shape-aware skeleton with reserved space for legend and axes — no layout shift when real data arrives.
API Reference
CalendarHeatmapChart
| Property | Type | Default | Description |
|---|---|---|---|
| Data | object? | null | Calendar data as [date, value] pairs. |
| Year | int | current year | The year to display. |
| VisualMapMin | double | 0 | Minimum value for color mapping. |
| VisualMapMax | double | 10 | Maximum value for color mapping. |
| Colors | List<string>? | null | Custom color range (defaults to green shades). |
| IsLoading | bool | false | When true, renders a shape-matched loading skeleton in place of the chart. Bind to your async fetch state. |
| ShowLoadingSkeleton | bool | true | Set to false to opt out of the skeleton (chart area stays empty while IsLoading is true). |
| SkeletonKind | ChartSkeletonKind | (chart default) | Override the skeleton silhouette (Bars, Line, Area, Pie, Scatter, Grid, Generic). |
| SkeletonStyle | ChartSkeletonStyle | Phantom | Phantom renders the real chart with placeholder data and morphs to real data via ECharts animation. Silhouette falls back to the legacy SVG skeleton overlay. |
| ShowLoadingLabel | bool | true | Shows a small "Loading…" pill in the top-right corner whenever IsLoading is true. Layered on top of any SkeletonStyle. Set to false for bare visuals. (rc.18) |
| LoadingText | string? | "Loading…" | Label rendered next to the spinner inside the loading pill. Set to empty to show the spinner alone. (rc.18) |
| ShowTooltip | bool | true | Enables the hover tooltip showing date and value. |
| Width | string | "100%" | CSS width of the chart container. |
| Height | string | "350px" | CSS height of the chart container. |
| Theme | string? | null | Optional ECharts theme name override. |
| PhantomCycleMs | int | 1400 | Phantom-mode refresh interval in milliseconds. Lower = faster data cycling while loading. |
| ShowDataLabels | bool | false | When true, displays value labels inside each calendar cell. |
| LabelPosition | string | "inside" | Position of data labels relative to each cell. |
| LabelFormat | string? | null | Optional ECharts label formatter string for cell labels. |
| DataZoom | bool | false | Enables the interactive data-zoom slider beneath the chart. |
| Toolbox | bool | false | Shows the ECharts toolbox with export and zoom controls. |
| ColorPalette | List<string>? | null | Alternate full color palette applied to the chart. |
| AnimationDuration | int? | null | Animation duration in milliseconds when data changes. |
| AnimationEasing | string? | null | ECharts easing function name for animation curves. |