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<HTML><HEAD><TITLE>Mag 4x:Sketch of Code </TITLE><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.53"><LINKREL="HOME"TITLE="Documentation Set for Swarm 2.1.1"HREF="set.html"><LINKREL="UP"TITLE="Brief Overview of Swarm"HREF="book149.html"><LINKREL="PREVIOUS"TITLE="Summary"HREF="swarm.overview.mag3.summary.sect1.html"><LINKREL="NEXT"TITLE="Defining an Agent"HREF="swarm.overview.mag4.define-agent.sect1.html"></HEAD><BODYCLASS="CHAPTER"BGCOLOR="#FFFFFF"TEXT="#000000"LINK="#0000FF"VLINK="#840084"ALINK="#0000FF"><DIVCLASS="NAVHEADER"><TABLEWIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">Documentation Set for Swarm 2.1.1</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="swarm.overview.mag3.summary.sect1.html">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom"></TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="swarm.overview.mag4.define-agent.sect1.html">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="CHAPTER"><H1><ANAME="SWARM.OVERVIEW.MAG4.CHAPTER">Chapter 4. Mag 4x:Sketch of Code </A></H1><DIVCLASS="TOC"><DL><DT><B>Table of Contents</B></DT><DT>4.1. <AHREF="swarm.overview.mag4.chapter.html#SWARM.OVERVIEW.MAG4.MODEL-SWARM.SECT1">Building a Model Swarm</A></DT><DT>4.2. <AHREF="swarm.overview.mag4.define-agent.sect1.html">Defining an Agent</A></DT><DT>4.3. <AHREF="swarm.overview.mag4.build-agents.sect1.html">Building Agents</A></DT><DT>4.4. <AHREF="swarm.overview.mag4.build-space.sect1.html">Building Space objects</A></DT><DT>4.5. <AHREF="swarm.overview.mag4.schedule-swarm.sect1.html">Scheduling a Model Swarm</A></DT><DT>4.6. <AHREF="swarm.overview.mag4.build-observer.sect1.html">Building a Graphical Observer Swarm</A></DT><DT>4.7. <AHREF="swarm.overview.mag4.build-graph.sect1.html">Building a Data Graph</A></DT><DT>4.8. <AHREF="swarm.overview.mag4.main-func.sect1.html">The main() function</A></DT></DL></DIV><P>Now that we have multiple Swarms and an experimental apparatus, it's time to learn how to use the objects themselves inside an application. Some examples are provided here: to understand this better, it will be necessary to read through example applications and the library documentation. These examples come from the Heatbugs application.</P><DIVCLASS="SECT1"><H1CLASS="SECT1"><ANAME="SWARM.OVERVIEW.MAG4.MODEL-SWARM.SECT1">4.1. Building a Model Swarm</A></H1><P>The key component of a simulation is the model Swarm. Here is the definition of a HeatbugModelSwarm, from HeatbugModelSwarm.h</P><TABLEBORDER="0"BGCOLOR="#E0E0E0"WIDTH="100%"><TR><TD><PRECLASS="PROGRAMLISTING"> @interface HeatbugModelSwarm : Swarm { int numBugs; // simulation parameters double evaporationRate; double diffuseConstant; int worldXSize, worldYSize; int minIdealTemp, maxIdealTemp; int minOutputHeat, maxOutputHeat; double randomMoveProbability; id modelActions; // scheduling data structures id modelSchedule; id heatbugList; // list of all the heatbugs Grid2d * world; // objects representing HeatSpace * heat; // the world}-getHeatbugList; // access methods into the-(Grid2d *) getWorld; // model swarm. These methods-(HeatSpace *) getHeat; // allow the model swarm to be observed.+createBegin: aZone; // extra methods you-createEnd; // provide for Swarms-buildObjects;-buildActions;-activateIn: swarmContext; </PRE></TD></TR></TABLE><P>The first section of code says that a HeatbugModelSwarm is a kind of Swarm. HeatbugModelSwarm inherits a lot of behavior from generic Swarm, but also adds new variables and methods.</P><P>The new variables are enclosed in the braces in the definition of HeatbugModelSwarm. They are split into three general classes of things: simulation parameters, schedule data structures, and objects in the world. This is a typical sort of model swarm.</P><P>Finally, a HeatbugModelSwarm defines new methods. The first few methods are used to allow the model to be observed: a HeatbugModelSwarm will give out its list of Heatbugs, for instance, or its HeatSpace. Observers use these methods to monitor the model.</P><P>In addition to the observation methods, there are several Swarm-specific methods for the building of Swarms. These are fairly stereotyped. The <TTCLASS="LITERAL">createBegin</TT> and <TTCLASS="LITERAL">createEnd</TT> messages are used to create the Swarm object itself. <TTCLASS="LITERAL">buildObjects</TT> builds the model objects, and <TTCLASS="LITERAL">buildActions</TT> builds the model schedule - more on these later. Finally, <TTCLASS="LITERAL">activateIn</TT> arranges for the execution machinery to execute the Swarm itself. </P></DIV></DIV><DIVCLASS="NAVFOOTER"><HRALIGN="LEFT"WIDTH="100%"><TABLEWIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><AHREF="swarm.overview.mag3.summary.sect1.html">Prev</A></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="set.html">Home</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><AHREF="swarm.overview.mag4.define-agent.sect1.html">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">Summary</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="book149.html">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">Defining an Agent</TD></TR></TABLE></DIV></BODY></HTML>⌨️ 快捷键说明
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