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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Danbooru Tree from JSON</title>
  <script src="https://d3js.org/d3.v7.min.js"></script>
  <style>
    body {
      font-family: sans-serif;
    }
    svg {
      width: 100%;
      height: 1500px;
    }
    .node circle {
      fill: steelblue;
    }
    .node text {
      font-size: 12px;
      fill: #333;
    }
    .link {
      fill: none;
      stroke: #ccc;
      stroke-width: 1.5px;
    }
  </style>
</head>
<body>
  <h2>Danbooru Categories</h2>
  <button id="downloadBtn">Download SVG</button>
  <svg></svg>

  <script>
    d3.json("json/danbooru_flat.json").then(function(data) {
      const svg = d3.select("svg");
      const width = 750;  
      const height = 1200;
  
      // ---- STEP 1: Limit second-level children ----
      function limitSecondLevel(node, depth = 0) {
        if (node.children && depth === 1 && node.children.length > 5) {
          const visible = node.children.slice(0, 5);
          visible.push({ name: "...", children: [] });
          node.children = visible;
        }
        if (node.children) {
          node.children.forEach(child => limitSecondLevel(child, depth + 1));
        }
        return node;
      }
  
      const limited = limitSecondLevel(structuredClone(data));
  
      const root = d3.hierarchy(limited, d => d.children);
  
      // ---- STEP 2: Track root category for coloring ----
      root.eachAfter(d => {
        if (d.depth === 1) {
          d.data.rootCategory = d.data.name;
        } else if (d.parent) {
          d.data.rootCategory = d.parent.data.rootCategory;
        }
      });
  
      const treeLayout = d3.tree().size([height, width]);
      treeLayout(root);
  
      // ---- STEP 3: Scale for tag_count → radius ----
      const allTagCounts = root.descendants()
        .filter(d => d.depth > 0)
        .map(d => d.data.tag_count || 0);
      const sizeScale = d3.scaleSqrt()
        .domain([0, d3.max(allTagCounts)])
        .range([4, 20]);
  
      // ---- STEP 4: Color Map ----
      const categoryColors = {
        "attire": "#f4a261",
        "body": "#e76f51",
        "characters": "#2a9d8f",
        "copyrights": "#264653",
        "creatures": "#8ecae6",
        "drawing software": "#219ebc",
        "games": "#3a86ff",
        "metatags": "#ffbe0b",
        "more": "#b5179e",
        "objects": "#6d6875",
        "plant": "#7cb518",
        "real_world": "#a5a58d",
        "sex": "#ef476f",
        "visual_characteristics": "#06d6a0",
        "subject": "#ffd166",
        "uncategorized": "#adb5bd",
        "actions_and_expressions": "#d00000",
        "objects_and_backgrounds": "#118ab2"
      };
  
      function getColor(d) {
        if (d.data.name === "...") return "gray";
        const category = d.data.rootCategory?.toLowerCase();
        return categoryColors[category] || "steelblue";
      }
  
      // ---- STEP 5: Draw Links ----
      svg.selectAll(".link")
        .data(root.links())
        .join("path")
        .attr("class", "link")
        .attr("d", d3.linkHorizontal()
          .x(d => d.y)
          .y(d => d.x)
        );
  
      // ---- STEP 6: Draw Nodes ----
      const node = svg.selectAll(".node")
        .data(root.descendants())
        .join("g")
        .attr("class", "node")
        .attr("transform", d => `translate(${d.y},${d.x})`);
  
      node.append("circle")
        .attr("r", d => d.depth === 0 ? 6 : sizeScale(d.data.tag_count || 0))
        .style("fill", d => d.data.color || "steelblue");

  
      node.append("title")
        .text(d => `${d.data.name}\nTags: ${d.data.tag_count || 0}`);
  
      node.append("text")
        .attr("x", 10)
        .style("font-weight", "bold")
        .attr("dy", "0.32em")
        .text(d => d.data.name);
    });

  document.getElementById("downloadBtn").addEventListener("click", () => {
  const svgNode = document.querySelector("svg");

  // Clone the SVG node to preserve original
  const clonedSvg = svgNode.cloneNode(true);
  const outer = document.createElement("div");
  outer.appendChild(clonedSvg);

  // Add xmlns so it can be saved properly
  clonedSvg.setAttribute("xmlns", "http://www.w3.org/2000/svg");

  // Serialize the SVG
  const svgData = new XMLSerializer().serializeToString(clonedSvg);
  const svgBlob = new Blob([svgData], { type: "image/svg+xml;charset=utf-8" });

  // Create download link
  const url = URL.createObjectURL(svgBlob);
  const a = document.createElement("a");
  a.href = url;
  a.download = "danbooru_tree.svg";
  document.body.appendChild(a);
  a.click();
  document.body.removeChild(a);
  URL.revokeObjectURL(url);
});
  </script>
  
  
</body>
</html>