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<HTML><HEAD><TITLE>Defining an Agent</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="Mag 4x:Sketch of Code "HREF="swarm.overview.mag4.chapter.html"><LINKREL="PREVIOUS"TITLE="Mag 4x:Sketch of Code "HREF="swarm.overview.mag4.chapter.html"><LINKREL="NEXT"TITLE="Building Agents"HREF="swarm.overview.mag4.build-agents.sect1.html"></HEAD><BODYCLASS="SECT1"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.mag4.chapter.html">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom">Chapter 4. Mag 4x:Sketch of Code</TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="swarm.overview.mag4.build-agents.sect1.html">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="SECT1"><H1CLASS="SECT1"><ANAME="SWARM.OVERVIEW.MAG4.DEFINE-AGENT.SECT1">4.2. Defining an Agent</A></H1><P>The agents are typically the real focus of a modeling effort. Most of the work in a simulation comes in defining the agent behavior so that the computer agents resemble the real world phenomena you are trying to create.</P><P>In the case of Heatbugs, agents are pretty simple. Here is their definition, from Heatbug.h:</P><TABLEBORDER="0"BGCOLOR="#E0E0E0"WIDTH="100%"><TR><TD><PRECLASS="PROGRAMLISTING"> @interface Heatbug: SwarmObject { double unhappiness; // my current unhappiness int x, y; // my spatial coordinates HeatValue idealTemperature; // my ideal temperature HeatValue outputHeat; // how much heat I put out float randomMoveProbability; // chance of moving randomly Grid2d * world; // the world I live in int worldXSize, worldYSize; // how big that world is HeatSpace * heat; // the heat for the world Color bugColor; // my colour (display)}-setWorld: (Grid2d *) w Heat: (HeatSpace *) h; // which world are we in?-createEnd;-(double) getUnhappiness;-setIdealTemperature: (HeatValue) i;-setOutputHeat: (HeatValue) o;-setRandomMoveProbability: (float) p;-setX: (int) x Y: (int) y; // bug's position-setBugColor: (Color) c; // bug's colour (display)-step;-drawSelfOn: (id <Raster>) r; </PRE></TD></TR></TABLE><P>Heatbug is a subclass of SwarmObject. SwarmObjects have very little behavior of their own - they are defined as the root class of most objects and control computer science aspects like memory allocation and probability.</P><P>Heatbug carry with them a variety of state variables. For instance, each Heatbug has a notion of its ideal temperature, which will affect it's behavior. In addition, Heatbugs have variables that let them know about the world: these agents are storing references to the HeatSpace object, for example.</P><P> Most of the Heatbug methods have to do with setting up the agents state - the inputs to a Heatbug. Every heatbug must set up its world and heat objects, via the <TTCLASS="LITERAL">setWorld:Heat:</TT> method. In addition when Heatbugs are created they have their ideal temperature set, their output heat, etc. Heatbugs are also observable. Heatbugs define a <TTCLASS="LITERAL">getUnhappiness</TT> method - the unhappiness is the major measurable aspect of a heatbug, how well optimized it is at the moment. They also have a <TTCLASS="LITERAL">drawSelfOn</TT> method that directs the heatbug to draw itself on the specified graphics widget.</P><P>Finally, and most importantly, a Heatbug has a <TTCLASS="LITERAL">step</TT> method. <TTCLASS="LITERAL">step</TT> is where the Heatbugs behavior is defined: every time the Heatbug is told to step it performs its internal calculations, choosing where to move. Each heatbug is told to <TTCLASS="LITERAL">step</TT> when appropriate by the model schedule. The code for <TTCLASS="LITERAL">step</TT> is the real intellectual input into the model, and is worth reading as an example of an agent's behavior.</P></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.mag4.chapter.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.build-agents.sect1.html">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">Mag 4x:Sketch of Code</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="swarm.overview.mag4.chapter.html">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">Building Agents</TD></TR></TABLE></DIV></BODY></HTML>⌨️ 快捷键说明
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