Getting started

Install the package

Add the Meziantou.Framework.Diagrams package to a project:

dotnet package add Meziantou.Framework.Diagrams

The types are in the Meziantou.Framework.Diagrams namespace.

Draw a flowchart

Create a FlowchartDiagram, add nodes and edges, and write the SVG:

var flowchart = new FlowchartDiagram { Title = "Order processing" };
var start = flowchart.AddNode("start", "Order received", FlowchartNodeShape.Stadium);
var check = flowchart.AddNode("check", "Is the payment valid?", FlowchartNodeShape.Diamond);
var ship = flowchart.AddNode("ship", "Ship the order");
var cancel = flowchart.AddNode("cancel", "Cancel the order");

flowchart.AddEdge(start, check);
flowchart.AddEdge(check, ship, "yes");
flowchart.AddEdge(check, cancel, "no");

var svg = flowchart.ToSvg();

The layout places the nodes in ranks, in the Direction of the flow, and routes the edges between them. WriteSvg writes the SVG to a stream or a writer, and CreateScene returns the layout as drawing primitives (see vector graphics).

From Mermaid text

To draw a diagram written in Mermaid, add the Meziantou.Framework.Mermaid package and parse the text:

dotnet package add Meziantou.Framework.Mermaid

var text = """
    ---
    title: Order processing
    config:
      theme: forest
    ---
    flowchart LR
        start([Order received]) --> check{Payment valid?}
        check -->|yes| ship[Ship the order]
        check -->|no| cancel[Cancel the order]
    """;

var document = MermaidDocument.Parse(text);
var flowchart = (FlowchartDiagram)document.Content;
var svg = flowchart.ToSvg();

See Mermaid for the supported syntax.