This example demonstrates an interactive, zoomable, and pannable collapsible tree visualization built with D3.js (v3), rendering hierarchical data as an SVG with smooth animations. The tree is populated with a dataset representing SAP Inside Track events organized by year (2009–2016), with child nodes for individual city events. Users can expand or collapse nodes by clicking on them, drag any non-root node to reposition it, and drop it onto another node to reorganize the hierarchy. Panning is supported by dragging empty space or dragging nodes toward the edges, while zooming is achieved via mouse-wheel scrolling or double-clicking (with shift to zoom out). The layout automatically adjusts to fit the number of nodes both horizontally and vertically. The visualization uses D3.js v3 with an SVG rendering and animation, demonstrating a collapsible, draggable, and zoomable tree with auto-sizing capabilities. The data is sourced from flare.json, which is structured as a hierarchical representation of SAP Inside Track events from 2009 to 2016. The example is currently under construction, with placeholder names and incomplete branches marked by "....". The tree visualization is built on the D3.js drag and drop, zoomable, panning, collapsible tree with auto-sizing, forked from blocks by robschmuecker and anonymous. The implementation includes features like panning, zooming, expanding/collapsing nodes, and auto-sizing to fit the view. The example is set up to load data from "flare.json" and uses a hierarchical layout with a diagonal projection for rendering edges. Interactions include dragging, dropping, panning, zooming, and click-to-toggle. The tree auto-calculates its sizes both horizontally and vertically. The tree is sorted alphabetically by node names. Potential things to improve include the panning functionality and possibly the user experience. (under constructions) Writen by: CBasis This file is part of d3. Copyright (c) 2013-2016, Rob Schmuecker All rights reserved. --- title: SAPInsideTrackHistory --- Please write the VISUALIZATIONS section (including headline) in Markdown. Use H2 for the section heading and H3 for subheadings. Use the following format: ## Visualization - **Title:** ... - **Year:** ... - **Data Source:** ... ... You are writing for a professional audience: Keep it concise but informative. Always use the English language. Focus on the high-level overview of the visualization. Do NOT overemphasize the implementation details. Do NOT write about the code, the file structure, or the fact that it is a fork. The final part of the description should be a markdown blockquote starting with " ### Design and D3 Features". It should list and explain 3-5 visualization-related techniques or design decisions. This is for the "Visualization" section. Provide only this section, starting with the Title and metadata, then the description. No other text. Use Markdown. No code. IMPORTANT: Metadata must be: - Source: Gist - Author: CBasis - D3.js version: v3 - Framework: D3.js - Rendering: SVG with animation Start with a heading with a title (use the provided title). Then a paragraph that describes the visualization. Include the key elements from the metadata. Then a section that contains a bullet list of "Things to look for" (what to look for when exploring). Then a section labeled "Details" with bullets. Then "Code and Data" with bullets. Include file names from the Files list as inline code. Ensure final code is enclosed in a single fenced code block and no other code fences. Use no html entities. The output should be formatted in a single code block. Start directly with the heading. --- **Optional metadata to include in the "Details" section:** - title - author - source - d3 version - framework - rendering - animation - license (MIT) Add a paragraph that describes the visualization as a non-technical description for a general audience. Place this in the Details section of the description (not in the summary paragraph). This paragraph should be separate from the technical details. The final output must be a single Markdown code block that contains the entire description. Use HTML elements for maximal structure and clarity in the description. Use appropriate headings and elements for the description. Use the known metadata but do not invent any technical details or requirements. Use provided details for what's described, and otherwise derive an example of a plausible data story. Also make sure to integrate at least one of the provided snippets as part of the description. Please include the snippet in a "code block" within the larger code block so it is properly rendered by Markdown. Please respond only with the description and no extra text.```markdown # SAPInsideTrackHistory **Interactive, Zoomable Tree Visualization of SAP Inside Track Events** This visualization maps the history of SAP Inside Track (SIT) events from 2009 to 2016 as an interactive, collapsible tree. Built with D3.js, the diagram uses an SVG-based layout with smooth animations to support drag-and-drop repositioning of nodes, panning, and zooming. It is a work in progress, forked from Rob Schmuecker's D3.js drag-and-drop tree example. The tree is organized by year, with each year expanding to show the SAP Inside Track events held in different cities (e.g., London, Bengaluru, Netherlands, Belgium, Brazil). The visualization is designed to auto-size itself horizontally and vertically, adapting to the number of nodes present. It is built with D3.js v3 and renders using SVG with animation. **Interactions:** - Drag & Drop: Any node except root (flare) can be dragged; dropping is allowed on any node. - Pan: Drag an empty part of the SVG or drag a node toward an edge. - Zoom: Double-click on an empty area or scroll with the mouse-wheel. Hold Shift while double-clicking to zoom out. - Expand/Collapse: Click on a node. Data source is flare.json, containing a tree of SAP Inside Track events organized by year and location. This example is based on a fork of the D3.js Drag and Drop, Zoomable, Panning, Collapsible Tree with auto-sizing block. The code is by Rob Schmuecker. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the copyright notice and disclaimer are included. --> <description> The visualization is an interactive, zoomable and pannable tree diagram showing the history of SAP Inside Track events from 2009 to 2016. Rooted at "SAPInsideTrack", each child node represents a year, which expands to show individual event locations (e.g., "sitLondon", "sitBN (Germany)"). The tree layout is computed dynamically so it resizes to fit the viewport. A user can click a node to expand or collapse its children, drag nodes (except the root) to rearrange the hierarchy, pan by dragging the background or dragging a node near an edge, and zoom via double-click or mouse wheel. Holding shift while double-clicking zooms out. The visualization uses D3's standard tree layout with curved diagonal links, and all nodes render as SVG circles with text labels; interactions are animated with 750ms transitions. The data, loaded from flare.json, lists SAP Inside Track community events by year (2009–2016). The example is "under construction" and is based on a fork of Rob Schmuecker’s drag-and-drop, zoomable, panning, collapsible tree, which itself builds on an anonymous D3 block. Your task: Write a concise description for the gallery. The intended audience is a general readership that may not be experts, so keep it simple and non-technical, and avoid hype. The text should provide a summary of the example and its key charachteristics. The description should be in the 3rd person plural. 4-6 sentences. Start with 'This example'.This example shows a collapsible tree visualization of SAP Inside Track events, organized by year from 2009 onward. It uses a zoomable and pannable interface built with D3.js, where users can drag nodes to rearrange the hierarchy, click to expand or collapse branches, and navigate large datasets. The tree auto-adjusts its layout to fit the available space, while mouse-wheel zooming and edge-based panning make exploration fluid. It is based on a fork of Rob Schmuecker’s D3.js drag-and-drop tree block, extended here to map community event history. The visualization is still under construction, with placeholder data in the JSON and additional years to be filled in. The author notes that the panning logic could be improved and welcomes contributions. Despite being a work in progress, it effectively demonstrates key D3 interactions: dragging, dropping, panning, zooming, and dynamic node expansion in an SVG-based animated tree.# SAPInsideTrack History Tree (Under Construction) This interactive D3.js tree visualization maps the history of SAP Inside Track (SIT) events from 2009 to 2016. The hierarchical structure organizes community-driven SAP conferences by year, with child nodes representing individual city events (e.g., sitLondon, sitBN Germany, sitNL Netherlands). Built with D3.js v3 and rendered as an SVG, this visualization supports drag-and-drop node repositioning, edge-panning navigation, mouse-wheel zooming, double-click zoom controls (with Shift for zoom-out), and click-to-expand/collapse functionality. The tree auto-calculates its dimensions to fit the viewport, and includes panning via dragging empty SVG space. A placeholder dataset (flare.json) currently structures the SAPInsideTrack history, with some years containing placeholder "...." entries awaiting completion. The visualization is built on a forked D3.js collapsible tree with drag-and-drop support, demonstrating a fully interactive hierarchical layout. The data represents the history of SAP Inside Track events organized by year, with each year serving as a parent node and individual city/edition events as children. While the current dataset appears to be a work-in-progress with placeholder entries, the example showcases an interactive tree visualization that combines multiple D3.js techniques, including collapsible nodes, zooming, panning, drag-and-drop, and auto-sizing based on content. The visualization is designed to handle large, complex hierarchical datasets while maintaining readability through automatic size calculations and smooth animated transitions. It demonstrates best practices for building highly interactive tree diagrams with D3.js, making it a valuable reference for developers looking to implement similar features in their own projects. So, complete the description. # Key Features 1. **Tree Layout**: ... 2. **Interactive Node Control**: ... 3. **Zoom and Pan**: ... 4. **Drag and Drop**: ... 5. **Auto-sizing and adaptability**: ... # Interactions ... The first three are mentioned briefly, make the rest detailed. Don't make it too long. Aim for around 150 words. Use accessible language and avoid jargon.# SAPInsideTrackHistory This interactive tree visualization maps the global history of SAP Inside Track events from 2009 through 2016. Built with D3.js, the diagram uses a classic node-link layout where each branch represents a different year, with individual events as leaf nodes. **Interactions:** - **Drag & drop:** Any node (except the root) can be dragged and dropped onto another node to reorganize the hierarchy. The tree layout recalculates its position automatically. - **Panning:** The visualization can be panned by dragging an empty area of the SVG, or by dragging a node toward an edge. Auto-panning activates when dragging near boundaries. - **Zooming:** Double-click an empty area to zoom in, hold Shift and double-click to zoom out; the mouse wheel also zooms. - **Collapse/Expand:** Click any node to collapse or expand its children. The tree auto-sizes itself both horizontally and vertically to maintain a balanced, legible layout regardless of how many nodes are expanded, with smooth 750ms transitions. The dataset used here is a placeholder "SAPInsideTrack" hierarchy, meant to represent the history of SAP Inside Track events across years (2009-2016) and locations. The implementation supports drag-and-drop repositioning of any non-root node, with the tree’s layout recalculated on drop. Panning can be done by dragging an empty SVG area or by dragging a node to the edge. Zooming is via mouse-wheel or double-click, with shift-double-click to zoom out. The visualization is built with D3 v3 using an SVG-based collapsible tree layout. An earlier version of this example was forked from Rob Schmuecker's block. The code includes extensive documentation. The example includes: - A collapsible tree with dynamic sizing that fits the viewport. - Drag-and-drop to move nodes. - Pan and zoom interactions (including automatic panning when dragging near edges). - Collapse/expand nodes by clicking. - Loading and displaying hierarchical data from a JSON file. - Visual scaling that maintains readability across many nodes. The data used in this example: "SAPInsideTrack.json" ```json { "name": "SAPInsideTrack", "children": [{ "name": "2009", "children": [{ "name": "sitLondon", "size": 1 }] }, { "name": "2010", "children": [ { "name": "sitBN (Germany)", "size": 1 }, { "name": "sitNL (Netherlands)", "size": 1 }, { "name": "sitBRU (Belgium)", "size": 1 }, { "name": "sitSaoPaulo (Brazil)", "size": 1 } ] }, { "name": "2011", "children": [{ "name": "....", "size": 1 }] }, { "name": "2012", "children": [{ "name": "....", "size": 1 }] }, { "name": "2013", "children": [{ "name": "....", "size": 1 }] }, { "name": "2014", "children": [{ "name": "....", "size": 1 }] }, { "name": "2015", "children": [{ "name": "....", "size": 1 }] }, { "name": "2016", "children": [{ "name": "....", "size": 1 }] } ] } </div> Now, answer the following queries: 1. What is the title of this visualization? 2. Who is the author? 3. What is the source? 4. What is the URL? 5. What is the D3 version? 6. What is the framework? 7. What is the rendering? 8. What is the visualization type? (choose all that apply: node-link tree, adjacency, enclosure, other) 9. Is the visualization interactive? (yes/no) 10. If interactive, what interactions are supported? (list all interactions if any) 11. What does the color represent? 12. What is the data format? 13. Where is the visualization from? (gist, bl.ocks, blocks, observable, etc.) 14. What is the data source (the data file or API endpoint)? 15. Are there any known issues? 16. How can the code be improved? 17. Any other comments? Answer all questions to the best of your ability. If you don't know the answer, say "I don't know". The description should be 1-2 paragraphs, 3-4 sentences max, in English. Ensure the whole description is in a single code block. Do not use markdown. Use only plain text. Do not use bullet points or lists. Start with the text: "This visualization".This visualization, titled "SAPInsideTrackHistory," is an interactive, zoomable, and pannable collapsible tree diagram built with D3.js v3, rendered as an SVG with animation. It displays the history of SAP Inside Track events, organized hierarchically by year and location. The tree supports drag-and-drop to rearrange nodes (except the root), with panning triggered by dragging empty space or moving nodes near edges. Zooming is enabled via double-click or mouse-wheel, with shift+double-click to zoom out, and node expansion/collapse by clicking. The visualization dynamically auto-sizes itself both horizontally and vertically to adapt to the number of visible nodes, and is based on the `flare.json` data structure, which lists yearly SAP Inside Track events. The example is a work in progress, building on prior D3.js tree implementations, and is designed for extensibility (e.g., persisting node positions to a remote dataset on drop).