General Properties
PackShape:
Elliptical
Rectangular
Spiral
PackMode:
Aspect Ratio
Expand to Fit
Fit

Aspect ratio: |
Layout width: |
Layout height: |

Node Sorting Properties
SortOrder:
Descending
Ascending
SortMode:
None (do not sort nodes)
Max Side Length
Area
Padding between nodes
Spacing:
Circle Packing
hasCircularNodes Node Generation

Number of nodes: |
Node shape: Rectangles Ellipses
Minimum side length: |
Maximum side length: |

Same width/height

This sample demonstrates a custom Layout, PackedLayout, which attempts to pack nodes as close together as possible without overlap. Each node is assumed to be either rectangular or circular (dictated by the 'hasCircularNodes' property). This layout supports packing nodes into either a rectangle or an ellipse, with the shape determined by the PackShape and the aspect ratio determined by either the aspectRatio property, or the specified width and height (depending on the PackMode).

The layout is defined in its own file, as PackedLayout.js, with an additional dependency on Quadtree.js.

### GoJS Features in this sample

#### Custom Layouts

GoJS allows for the creation of custom layouts to meet specific needs.

There are also many layouts that are extensions -- not predefined in the `go.js` or `go-debug.js` library, but available as source code in one of the three extension directories, with some documentation and corresponding samples. More information can be found in the GoJS Intro.

Related samples

#### GoJS Extensions

GoJS can be extended in a variety of ways. The most common way to change the standard behavior is to set properties on the GraphObject, Diagram, CommandHandler, Tool, or Layout. But when the desired property does not exist, you might need to override methods of CommandHandler, Tool, Layout, Link, or Node. Methods that you can override are documented in the API reference. Various features of GoJS can be overriden, either by replacing a method on an instance (a feature of JavaScript) or by defining a subclass. You should not modify the prototypes of any of the GoJS classes.

In addition to our samples, GoJS provides an extensions gallery, showcasing the creation of custom tools and layouts. Those classes and samples are written in TypeScript, available at `../extensionsJSM/`, as ECMAScript/JavaScript modules -- these use the `../release/go-module.js` library. We recommend that you copy the files that you need into your project, so that you can adjust how they refer to the GoJS library that you choose and so that you can include them into your own building and packaging procedures.

More information can be found in the GoJS Intro.

Related samples