| import com.google.api.client.auth.oauth2.Credential; | |
| import com.google.api.client.auth.oauth2.TokenResponse; | |
| import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeFlow; | |
| import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeRequestUrl; | |
| import com.google.api.client.googleapis.auth.oauth2.GoogleCredential; | |
| import com.google.api.client.googleapis.auth.oauth2.GoogleTokenResponse; | |
| import com.google.api.client.http.GenericUrl; | |
| import com.google.api.client.http.HttpRequest; | |
| import com.google.api.client.http.HttpRequestFactory; | |
| import com.google.api.client.http.HttpTransport; |
The tree layout implements the Reingold-Tilford algorithm for efficient, tidy arrangement of layered nodes. The depth of nodes is computed by distance from the root, leading to a ragged appearance. Radial orientations are also supported. Implementation based on work by Jeff Heer and Jason Davies using Buchheim et al.'s linear-time variant of the Reingold-Tilford algorithm. Data shows the Flare class hierarchy, also courtesy Jeff Heer.
Compare to this radial layout.
Click to add nodes! Nodes near the cursor will be linked to the new node.
D3's force layout uses the Barnes–Hut approximation to compute repulsive charge forces between all nodes efficiently. Links are implemented as geometric constraints on top of position Verlet integration, offering greater stability. A virtual spring between each node and the center of the chart prevents nodes from drifting into space.
A force-directed graph using images as nodes, with accompanying text labels.
This example builds a random tree using the Reingold-Tilford "tidy" algorithm, as described in "Tidier Drawings of Trees" and implemented by d3.layout.tree. As each node is added to the graph, it enters from the previous position of the parent node. Thus, the existing nodes and the new node transition smoothly to their new positions. The animation stops when 500 nodes have been added to the tree.
| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .link { | |
| fill: none; | |
| stroke: #666; | |
| stroke-width: 1.5px; | |
| } |
| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .link { | |
| fill: none; | |
| stroke: #aaa; | |
| } | |
| .node text { |
| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Collapsible Tree Example</title> | |
| <style> | |
| .node circle { |