Add basic example models

Author: EwoutH

examples/basic/boid_flockers/Flocker Test.ipynb

@@ -0,0 +1,113 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "import matplotlib.pyplot as plt\n",
+    "from boid_flockers.model import BoidFlockers\n",
+    "\n",
+    "%matplotlib inline"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "def draw_boids(model):\n",
+    "    x_vals = []\n",
+    "    y_vals = []\n",
+    "    for boid in model.agents:\n",
+    "        x, y = boid.pos\n",
+    "        x_vals.append(x)\n",
+    "        y_vals.append(y)\n",
+    "    fig = plt.figure(figsize=(10, 10))\n",
+    "    ax = fig.add_subplot(111)\n",
+    "    ax.scatter(x_vals, y_vals)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [],
+   "source": [
+    "model = BoidFlockers(100, 100, 100, speed=5, vision=5, separation=1)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [],
+   "source": [
+    "for i in range(50):\n",
+    "    model.step()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "data": {
+      "image/png": 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+      "text/plain": [
+       "<matplotlib.figure.Figure at 0x108938a58>"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
+   "source": [
+    "draw_boids(model)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.4.2"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}

examples/basic/boid_flockers/Readme.md

@@ -0,0 +1,47 @@
+# Boids Flockers
+
+## Summary
+
+An implementation of Craig Reynolds's Boids flocker model. Agents (simulated birds) try to fly towards the average position of their neighbors and in the same direction as them, while maintaining a minimum distance. This produces flocking behavior.
+
+This model tests Mesa's continuous space feature, and uses numpy arrays to represent vectors. It also demonstrates how to create custom visualization components.
+
+## Installation
+
+To install the dependencies use pip and the requirements.txt in this directory. e.g.
+
+```
+    $ pip install -r requirements.txt
+```
+
+## How to Run
+
+* To launch the visualization interactively, run ``mesa runserver`` in this directory. e.g.
+
+```
+$ mesa runserver
+```
+
+or
+
+Directly run the file ``run.py`` in the terminal. e.g.
+
+```
+    $ python run.py
+```
+
+* Then open your browser to [http://127.0.0.1:8521/](http://127.0.0.1:8521/) and press Reset, then Run.
+
+## Files
+
+* [boid_flockers/model.py](boid_flockers/model.py): Core model file; contains the Boid Model and Boid Agent class.
+* [boid_flockers/SimpleContinuousModule.py](boid_flockers/SimpleContinuousModule.py): Defines ``SimpleCanvas``, the Python side of a custom visualization module for drawing agents with continuous positions.
+* [boid_flockers/simple_continuous_canvas.js](boid_flockers/simple_continuous_canvas.js): JavaScript side of the ``SimpleCanvas`` visualization module; takes the output generated by the Python ``SimpleCanvas`` element and draws it in the browser window via HTML5 canvas.
+* [boid_flockers/server.py](boid_flockers/server.py): Sets up the visualization; uses the SimpleCanvas element defined above
+* [run.py](run.py) Launches the visualization.
+* [Flocker_Test.ipynb](Flocker_Test.ipynb): Tests the model in a Jupyter notebook.
+
+## Further Reading
+
+The following link can be visited for more information on the boid flockers model:
+https://cs.stanford.edu/people/eroberts/courses/soco/projects/2008-09/modeling-natural-systems/boids.html

examples/basic/boid_flockers/app.py

@@ -0,0 +1,26 @@
+from boid_flockers.model import BoidFlockers
+from mesa.visualization import SolaraViz, make_space_matplotlib
+
+
+def boid_draw(agent):
+    return {"color": "tab:red"}
+
+
+model_params = {
+    "population": 100,
+    "width": 100,
+    "height": 100,
+    "speed": 5,
+    "vision": 10,
+    "separation": 2,
+}
+
+model = BoidFlockers(100, 100, 100, 5, 10, 2)
+
+page = SolaraViz(
+    model,
+    [make_space_matplotlib(agent_portrayal=boid_draw)],
+    model_params=model_params,
+    name="BoidFlockers",
+)
+page  # noqa

examples/basic/boid_flockers/boid_flockers/SimpleContinuousModule.py

@@ -0,0 +1,29 @@
+import mesa
+
+
+class SimpleCanvas(mesa.visualization.VisualizationElement):
+    local_includes = ["boid_flockers/simple_continuous_canvas.js"]
+
+    def __init__(self, portrayal_method=None, canvas_height=500, canvas_width=500):
+        """
+        Instantiate a new SimpleCanvas
+        """
+        self.portrayal_method = portrayal_method
+        self.canvas_height = canvas_height
+        self.canvas_width = canvas_width
+        new_element = (
+            f"new Simple_Continuous_Module({self.canvas_width}, {self.canvas_height})"
+        )
+        self.js_code = "elements.push(" + new_element + ");"
+
+    def render(self, model):
+        space_state = []
+        for obj in model.agents:
+            portrayal = self.portrayal_method(obj)
+            x, y = obj.pos
+            x = (x - model.space.x_min) / (model.space.x_max - model.space.x_min)
+            y = (y - model.space.y_min) / (model.space.y_max - model.space.y_min)
+            portrayal["x"] = x
+            portrayal["y"] = y
+            space_state.append(portrayal)
+        return space_state