Daily activity across four months

Create a console project, add the ChartForgeX package, and replace Program.cs with this source. Run it to write SVG, PNG and HTML with the default system fonts.

For the same typography as the gallery, download the gallery-font recipe and copy the gallery’s fonts directory beside your program.

using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using ChartForgeX.Core;
using ChartForgeX.Primitives;
using ChartForgeX.Rendering;
using ChartForgeX.Themes;
using ChartForgeX.Topology;
using ChartForgeX.Typography;
using ChartForgeX.VisualArtifacts;
using ChartForgeX.VisualBlocks;

var mode = VisualThemeMode.Light;
var theme = VisualTheme.Graphite();
var model = CalendarHeatmapRecipe.Create("wide", mode);
var context = new VisualRenderContext(
    new VisualLayoutOptions(new VisualSize(800, 440)), theme, mode,
    new VisualFrame("Daily activity across four months", "Explore the data, then download the chart", showLegend: null, showSurface: false));
var prepared = model.Prepare(context);
File.WriteAllText("visual.svg", prepared.ToSvg());
File.WriteAllBytes("visual.png", prepared.ToPng());
File.WriteAllText("visual.html", prepared.ToArtifact("example", VisualArtifactKind.Chart).ToHtmlPage());

/// <summary>Shows dated activity in a calendar heatmap with Monday-first weeks.</summary>
public static class CalendarHeatmapRecipe {
    /// <summary>Creates four months of observations, or a shorter sparse window.</summary>
    public static Chart Create(string variant = "wide", VisualThemeMode mode = VisualThemeMode.Light) {
        if (variant is not ("wide" or "compact" or "sparse" or "options" or "compact-options")) throw new ArgumentOutOfRangeException(nameof(variant));
        return Chart.Create().ConfigureCalendar(options => options.FirstDayOfWeek = DayOfWeek.Monday)
            .AddCalendarHeatmap("Observations", Enumerable.Range(0, variant == "sparse" ? 35 : 120)
                .Where(index => index % 7 != 0 && index % 9 != 0)
                .Select(index => new ChartCalendarHeatmapItem(new DateTime(2026, 1, 1).AddDays(index), index * 7 % 13)),
                id: new ChartSeriesId("daily-observations"))
            .WithValueFormat(ChartValueFormat.Number("0.##", CultureInfo.InvariantCulture));
    }
}

using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using ChartForgeX.Core;
using ChartForgeX.Primitives;
using ChartForgeX.Rendering;
using ChartForgeX.Themes;
using ChartForgeX.Topology;
using ChartForgeX.Typography;
using ChartForgeX.VisualArtifacts;
using ChartForgeX.VisualBlocks;

var mode = VisualThemeMode.Dark;
var theme = VisualTheme.Graphite();
var model = CalendarHeatmapRecipe.Create("wide", mode);
var context = new VisualRenderContext(
    new VisualLayoutOptions(new VisualSize(800, 440)), theme, mode,
    new VisualFrame("Daily activity across four months", "Explore the data, then download the chart", showLegend: null, showSurface: false));
var prepared = model.Prepare(context);
File.WriteAllText("visual.svg", prepared.ToSvg());
File.WriteAllBytes("visual.png", prepared.ToPng());
File.WriteAllText("visual.html", prepared.ToArtifact("example", VisualArtifactKind.Chart).ToHtmlPage());

/// <summary>Shows dated activity in a calendar heatmap with Monday-first weeks.</summary>
public static class CalendarHeatmapRecipe {
    /// <summary>Creates four months of observations, or a shorter sparse window.</summary>
    public static Chart Create(string variant = "wide", VisualThemeMode mode = VisualThemeMode.Light) {
        if (variant is not ("wide" or "compact" or "sparse" or "options" or "compact-options")) throw new ArgumentOutOfRangeException(nameof(variant));
        return Chart.Create().ConfigureCalendar(options => options.FirstDayOfWeek = DayOfWeek.Monday)
            .AddCalendarHeatmap("Observations", Enumerable.Range(0, variant == "sparse" ? 35 : 120)
                .Where(index => index % 7 != 0 && index % 9 != 0)
                .Select(index => new ChartCalendarHeatmapItem(new DateTime(2026, 1, 1).AddDays(index), index * 7 % 13)),
                id: new ChartSeriesId("daily-observations"))
            .WithValueFormat(ChartValueFormat.Number("0.##", CultureInfo.InvariantCulture));
    }
}