sparsegridportrayal2d.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.portrayal.grid;

import sim.portrayal.*;
import sim.portrayal.simple.*;
import sim.field.grid.*;
import sim.util.*;
import java.awt.*;
import java.util.*;
import java.awt.geom.*;

/**
   Can be used to draw both continuous and descrete sparse fields
*/

public class SparseGridPortrayal2D extends FieldPortrayal2D
    {
    public DrawPolicy policy;

    public SparseGridPortrayal2D()
        {
        super();
        }

    public SparseGridPortrayal2D (DrawPolicy policy)
        {
        super();
        this.policy = policy;
        }

    // a grey oval.  You should provide your own protrayals...
    SimplePortrayal2D defaultPortrayal = new OvalPortrayal2D();

    public Portrayal getDefaultPortrayal()
        {
        return defaultPortrayal;
        }

    public void setField(Object field)
        {
        dirtyField = true;
        if (field instanceof SparseGrid2D ) this.field = field;
        else throw new RuntimeException("Invalid field for Sparse2DPortrayal: " + field);
        }
        
    protected void hitOrDraw(Graphics2D graphics, DrawInfo2D info, Bag putInHere)
        {
        final SparseGrid2D field = (SparseGrid2D) this.field;
        if (field==null) return;

        int maxX = field.getWidth(); 
        int maxY = field.getHeight();

        final double xScale = info.draw.width / maxX;
        final double yScale = info.draw.height / maxY;
        final int startx = (int)((info.clip.x - info.draw.x) / xScale);
        final int starty = (int)((info.clip.y - info.draw.y) / yScale); // assume that the X coordinate is proportional -- and yes, it's _width_
        int endx = /*startx +*/ (int)((info.clip.x - info.draw.x + info.clip.width) / xScale) + /*2*/ 1;  // with rounding, width be as much as 1 off
        int endy = /*starty +*/ (int)((info.clip.y - info.draw.y + info.clip.height) / yScale) + /*2*/ 1;  // with rounding, height be as much as 1 off

        final Rectangle clip = (graphics==null ? null : graphics.getClipBounds());

        DrawInfo2D newinfo = new DrawInfo2D(new Rectangle2D.Double(0,0, xScale, yScale),
                                            info.clip);  // we don't do further clipping 

        // If the person has specified a policy, we have to iterate through the
        // bags.  At present we have to do this by using a hash table iterator
        // (yuck -- possibly expensive, have to search through empty locations).
        if (policy != null)
            {
            Bag policyBag = new Bag();
            Iterator iterator = field.locationBagIterator();
            while(iterator.hasNext())
                {
                Bag objects = (Bag)(iterator.next());
                
                // restrict the number of objects to draw
                policyBag.clear();  // fast
                boolean val = policy.objectToDraw(objects,policyBag);
                if (val == DrawPolicy.DONE)
                    objects = policyBag;

                // draw 'em
                for(int x=0;x<objects.numObjs;x++)
                    {
                    final Object portrayedObject = objects.objs[x];
                    Int2D loc = field.getObjectLocation(portrayedObject);
                    // here we only draw the object if it's within our range.  However objects
                    // might leak over to other places, so I dunno...  I give them the benefit
                    // of the doubt that they might be three times the size they oughta be, hence the -2 and +2's
                    if (loc.x >= startx -2 && loc.x < endx + 4 &&
                        loc.y >= starty -2 && loc.y < endy + 4)
                        {
                        Portrayal p = getPortrayalForObject(portrayedObject);
                        if (!(p instanceof SimplePortrayal2D))
                            throw new RuntimeException("Unexpected Portrayal " + p + " for object " + 
                                                       portrayedObject + " -- expected a SimplePortrayal2D");
                        SimplePortrayal2D portrayal = (SimplePortrayal2D) p;
                        
                        // translate --- the   + newinfo.width/2.0  etc. moves us to the center of the object
                        newinfo.draw.x = (int)(info.draw.x + (xScale) * loc.x);
                        newinfo.draw.y = (int)(info.draw.y + (yScale) * loc.y);
                        newinfo.draw.width = (int)(info.draw.x + (xScale) * (loc.x+1)) - newinfo.draw.x;
                        newinfo.draw.height = (int)(info.draw.y + (yScale) * (loc.y+1)) - newinfo.draw.y;
                        
                        // adjust drawX and drawY to center
                        newinfo.draw.x += newinfo.draw.width / 2.0;
                        newinfo.draw.y += newinfo.draw.height / 2.0;

                        if (graphics == null)
                            {
                            if (portrayal.hitObject(portrayedObject, newinfo))
                                putInHere.add(getWrapper(portrayedObject));
                            }
                        else
                            {
                            // MacOS X 10.3 Panther has a bug which resets the clip, YUCK
                            graphics.setClip(clip);
                            portrayal.draw(portrayedObject, graphics, newinfo);
                            }
                        }
                    }
                }
            }
        else            // the easy way -- draw the objects one by one
            {
            Bag objects = field.getAllObjects();
            for(int x=0;x<objects.numObjs;x++)
                {
                final Object portrayedObject = objects.objs[x];
                Int2D loc = field.getObjectLocation(portrayedObject);

                // here we only draw the object if it's within our range.  However objects
                // might leak over to other places, so I dunno...  I give them the benefit
                // of the doubt that they might be three times the size they oughta be, hence the -2 and +2's
                if (loc.x >= startx -2 && loc.x < endx + 4 &&
                    loc.y >= starty -2 && loc.y < endy + 4)
                    {
                    Portrayal p = getPortrayalForObject(portrayedObject);
                    if (!(p instanceof SimplePortrayal2D))
                        throw new RuntimeException("Unexpected Portrayal " + p + " for object " + 
                                                   portrayedObject + " -- expected a SimplePortrayal2D");
                    SimplePortrayal2D portrayal = (SimplePortrayal2D) p;
                
                    // translate --- the   + newinfo.width/2.0  etc. moves us to the center of the object
                    newinfo.draw.x = (int)(info.draw.x + (xScale) * loc.x);
                    newinfo.draw.y = (int)(info.draw.y + (yScale) * loc.y);
                    newinfo.draw.width = (int)(info.draw.x + (xScale) * (loc.x+1)) - newinfo.draw.x;
                    newinfo.draw.height = (int)(info.draw.y + (yScale) * (loc.y+1)) - newinfo.draw.y;
                    
                    // adjust drawX and drawY to center
                    newinfo.draw.x += newinfo.draw.width / 2.0;
                    newinfo.draw.y += newinfo.draw.height / 2.0;

                    if (graphics == null)
                        {
                        if (portrayal.hitObject(portrayedObject, newinfo))
                            putInHere.add(getWrapper(portrayedObject));
                        }
                    else
                        {
                        // MacOS X 10.3 Panther has a bug which resets the clip, YUCK
                        graphics.setClip(clip);
                        portrayal.draw(portrayedObject, graphics, newinfo);
                        }
                    }
                }
            }
        }

    // The easiest way to make an inspector which gives the location of my objects
    public LocationWrapper getWrapper(Object object)
        {
        final SparseGrid2D field = (SparseGrid2D) this.field;
        return new LocationWrapper( object, null, this )  // don't care about location
            {
            public Object getLocation()
                {
                if (field==null) return null;
                else return field.getObjectLocation(this.object);
                }
                
            public String getLocationName()
                {
                Object loc = getLocation();
                if (loc == null) return "Gone";
                else return ((Int2D)loc).toCoordinates();
                }
            };
        }
    }