Flowchart.md

-flowchart specs
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+All Flowcharts are composed of nodes, the geometric shapes and edges, the arrows or lines. The mermaid code defines the way that these nodes and edges are made and interact.
+
+To create flowchart call static `Create` method as follows:
+```c#
+var chart = FlowChart.Create(Orientation.TopToBottom);
+var cat = chart.TextNode("Cat", Shape.Circle);
+var dog = chart.TextNode("Dog", Shape.Trapezoid);
+chart.Link(cat, dog, Link.Open, "hates");
+
+string mermaidSyntax = chart.Render();
+```
+
+## Defining nodes
+Flowchart only support text nodes. To create a text node call `TextNode` method and pass a title (optional) and node shape type
+```c#
+var cat = chart.TextNode("Cat", Shape.Circle);
+var dog = chart.TextNode("Dog", Shape.Trapezoid);
+```
+
+## Creating subgraphs
+To create a subgraph call `SubGraph` method of chart with specific title (optional) and orientation
+```c#
+var house = chart.SubGraph("House", Orientation.TopToBottom);
+```
+
+Subgraphs also have methods to create inner subgraphs, nodes, etc.
+```c#
+var kitchen = house.TextNode("Kitchen", Shape.RoundEdges);
+var bedroom = house.TextNode("Bedroom", Shape.RoundEdges);
+```
+
+## Linking
+To link nodes or subgraphs use `Link` method of chart or subgraphs with link members, link style and text (optional)
+```c#
+chart.Link(cat, kitchen, Link.Open, "prefers");
+chart.Link(dog, bedroom, Link.Cross, "not allowed");
+```
+
+## Interaction
+Supported interactions:
+1. Call function on click
+2. Make function call on click
+3. Set hyperlink for nodes
+
+### Call function on click
+To call function on node click use `OnClick` method of `chart.Interaction` property
+Example: show cat node id to user
+```c#
+chart.Interaction.OnClick(cat, "alert", "my tooltip");
+```
+
+### Make function call on click
+To make custom function call on click use `OnClickCall` method of `chart.Interation` property
+Example: say "meow" to user when clicking cat node
+```c#
+chart.Interaction.OnClickCall(cat, "alert(\"meow\")", "tooltip");
+```
+
+### Set hyperlink for nodes
+To add hyperlink to a node use `Hyperlink` method of `chart.Interaction` property
+Example: open GitHub in new tab when clicking cat node
+```c#
+chart.Interaction.Hyperlink(cat, new Uri("https://github.com"), "tooltip", HyperlinkTarget.Blank);
+```
+
+## Styling
+Supported styling:
+1. Define default node style
+2. Define and set specific CSS class to a node
+3. Set node style with CSS
+
+### Define default node style
+To define default node style use `DefaultStyle` property of `chart.Styling` property
+```c#
+chart.Styling.DefaultStyle = "color:pink,background-color:black";
+```
+
+### Set css class to a node
+To define and set specific CSS class for specific node use `AddClass`/`SetClass` methods of `chart.Styling` property
+```c#
+var myClass = chart.Styling.AddClass("color:#bff");
+chart.Styling.SetClass(kitchen, myClass);
+```
+
+### Set node style with CSS
+To set node style with css use `Set` method of `chart.Styling` property
+```c#
+chart.Styling.Set(cat, "fill: #bff");
+```
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