fly.java

MASON代表多主体邻里或网络仿真(Multi-Agent Simulator of Neighborhoods or Networks)。它是乔治梅森大学用Java开发的离散事件多主体仿真核心库

package sim.app.tutorial7;
import sim.engine.*;
import sim.util.*;
import sim.field.grid.*;

public class Fly implements Steppable
    {
    public void step(SimState state)
        {
        Tutorial7 tut = (Tutorial7) state;
        
        SparseGrid3D flies = tut.flies;
        
        // Move me in a random direction
        Int3D myLoc = flies.getObjectLocation(this);
        int x = flies.stx(myLoc.x + (tut.random.nextBoolean() ? 1 : -1));
        int y = flies.sty(myLoc.y + (tut.random.nextBoolean() ? 1 : -1));
        int z = flies.stz(myLoc.z + (tut.random.nextBoolean() ? 1 : -1));

        flies.setObjectLocation(this, new Int3D(x,y,z));
        
        // Update the projections with, I dunno, some function based on my position :-)
        tut.xProjection.field[y][z] += Math.log(x+2);
        tut.yProjection.field[x][z] += Math.log(y+2);
        tut.zProjection.field[x][y] += Math.log(z+2);
        }
    }