Create app.js

Explanation of Code:
HTML (index.html):

Includes D3.jsand sets up a basic HTML structure with a div (#viz) to hold the visualization.

CSS (style.css):

Adds basic styles for the body and visualization elements.

JavaScript (app.js):

Data Structure: stateMachineData contains sample nodes and links representing states and transitions.

SVG Canvas: Sets up an SVG canvas with defined width and height.

Simulation: Uses D3.jsforce simulation to position nodes and links.

Nodes and Links: Appends circles and text to represent states, and lines to represent transitions.

Tick Function: Updates positions of nodes and links on each tick of the simulation.

visualization/app.js

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+// Sample state machine data (for demonstration)
+const stateMachineData = {
+  nodes: [
+    { id: 'RedState', group: 1 },
+    { id: 'YellowState', group: 1 },
+    { id: 'GreenState', group: 1 }
+  ],
+  links: [
+    { source: 'RedState', target: 'YellowState', value: 1 },
+    { source: 'YellowState', target: 'GreenState', value: 1 }
+  ]
+};
+
+// Setup the SVG canvas dimensions
+const width = 800;
+const height = 600;
+
+const svg = d3.select("#viz")
+  .append("svg")
+  .attr("width", width)
+  .attr("height", height);
+
+const simulation = d3.forceSimulation(stateMachineData.nodes)
+  .force("link", d3.forceLink(stateMachineData.links).id(d => d.id))
+  .force("charge", d3.forceManyBody().strength(-400))
+  .force("center", d3.forceCenter(width / 2, height / 2));
+
+const link = svg.append("g")
+  .attr("class", "links")
+  .selectAll("line")
+  .data(stateMachineData.links)
+  .enter().append("line")
+  .attr("class", "link");
+
+const node = svg.append("g")
+  .attr("class", "nodes")
+  .selectAll("g")
+  .data(stateMachineData.nodes)
+  .enter().append("g");
+
+node.append("circle")
+  .attr("r", 10)
+  .attr("fill", d => '#69b3a2');
+
+node.append("text")
+  .attr("dy", -10)
+  .text(d => d.id);
+
+simulation
+  .nodes(stateMachineData.nodes)
+  .on("tick", ticked);
+
+simulation.force("link")
+  .links(stateMachineData.links);
+
+function ticked() {
+  link
+    .attr("x1", d => d.source.x)
+    .attr("y1", d => d.source.y)
+    .attr("x2", d => d.target.x)
+    .attr("y2", d => d.target.y);
+
+  node
+    .attr("transform", d => `translate(${d.x},${d.y})`);
+}