WebKit Examples
These examples illustrate a new Web-based technology for building and deploying Numerus simulations. Models are specified using a JSON project file (the model "DNA") and are built directly as Web applications. The model logic is programmed in one of two ways: 1) using Java code that runs on the server and interacts with the browser using web sockets; or 2) in Javascript that is downloaded and executed in the browser. The server-side execution model is intended for larger applications and minimal data exchange; a server-side Python API is also under development. The Javascript model executes very efficiently on the sample programs.
The distribution includes an application that sets up the directories and provides templates for the programmer.
To use, click Connect to initiate the web socket connection. This will enable the other 4 buttons: Disconnect, Reset, Step and Start. Use the Start/Stop button to run the program continuously. Step single-steps the program. Reset returns to the beginning. A Double-Reset reinitializes the simulation. You can also reinitialize with Disconnect/Connect, or simply reloading the web page.
All of the NetLogo-based translations include the NetLogo documentation. View documentation and the WebSocket log by clicking on the side panel icon: 
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A user guide is currently under construction. An overview showing how Numerus WebKit works can be found here
Java Versions Running on AWS Elastic Beanstalk
- Agents
- Simple agent motion.
- Ants
- NetLogo model. A colony of ants forages for food. Though each ant follows a set of simple rules, the colony as a whole acts in a sophisticated way.
- Diffusion
- NetLogo diffusion example. Diffusion Graphics is unlike most other NetLogo models, in that it really doesn’t ‘model’ anything. It simply explores the power behind an interesting patch primitive: ‘diffuse’.
- Diffusion Limited Aggregation
- This model demonstrates diffusion-limited aggregation, in which randomly moving (diffusing) particles stick together (aggregate) to form beautiful treelike branching fractal structures. There are many patterns found in nature that resemble the patterns produced by this model: crystals, coral, fungi, lightning, and so on
- Exponential Growth
- Exponential Growth.
- Fungal Growth
- From Whitney's NetLogo model
- Follower
- NetLogo model. In Follower, turtles attempt to “connect” with other turtles, forming long chains according to a small set of simple rules.
- Forest
- Forest fire model.
- Fire Works
- NetLogo model. This program models the action of fireworks. Rockets begin at the bottom of the view, shoot upwards into the sky and then explode, emitting showers of falling sparks. Works best at lower speed.
- Life
- Conway's Game of Life. Enough said.
- Life Agents
- Game of Life with agent motion. An agent passing over a live cell colors the cell with the agent's color.
- Lotka-Volterra Model
- Shows both time and phase graphs.
- Mongoose
- Current version of mongoose simulation.
- Meandering River
- Netlogo Model. This model demonstrates the meandering of a river along its “middle course”, where the gradient of the landscape is gradual and the river runs within a U-shaped river valley. The evolution of the shape of the river is governed by the path of its highest-velocity flow, as well as erosion and deposition.
- This example has documentation extracted from the Netlogo version. Click the icon on the top-right of the page.
- NetLogo Model. This model explores the role of movement and space in a three species ecosystem. The system consists of three species, represented by red patches, green patches, and blue patches, which compete over space. The interactions between the species are based on the game Rock-Paper-Scissors. That is, red beats green, green beats blue, and blue beats red. Organisms compete with their neighbors, move throughout the environment, and reproduce. These interactions result in spiral patterns whose size and stability depends on the movement rate of the organisms.
- Wolf Sheep Predation
- NetLogo Model. A population of sheep that wander around the landscape. For each step the sheep take it costs them some energy and if there energy gets too low they die. However, the sheep can eat grass in the environment to regain energy and the grass regrows over time. If the energy of the sheep gets above a certain level then they can reproduce. There are also wolves that have the same behaviors as sheep except for eating; rather than grass, they eat sheep.
- Wave Machine
- Netlogo Model. This model simulates wave motion in a membrane. The four edges of the membrane are fixed to a frame. A green rectangular area represents a driver plate that moves up and down, exhibiting sinusoidal motion.