simulationview.java

《湖泊生态的简单模拟》（Simulation Of Living Beings In A Lake ）。这是我修读美国卡耐基梅隆大学Carnegie Mellon University（CMU）课程s

import java.io.*;
import java.util.*;

/**
 * This class generates an HTML representation of the lake using the services 
 * of class {@link HtmlPage},{@link HtmlImage} and {@link HtmlTable} that model HTML elements.
 *
 * @author  张维
 * @version 1.0.0	 
 */
public class SimulationView {   
    
    /* Default constructor */
    public SimulationView() {
    	
    }
    
    /**
	   * Return the HTML code for construct the simulation page
	   * 
	   * @param sim  a object of Simulation
	   * @return the HTML code for construct the simulation page
	   */
    public static String getHtml(Simulation sim) {
    	
        HtmlPage simulationPage = new HtmlPage();
        
        simulationPage.setTitle("Fish Simulation");
        simulationPage.addText("<H2>Fish Simulation</H2>");
        
        HtmlTable lake = new HtmlTable(10);
        HtmlImage blankImage = new HtmlImage("/blank.gif", "Maybe algae. No other life.");
        
        int numRows = (sim.getLastRow() - sim.getFirstRow()) + 1;
        Vector beings = sim.getNeighbors(1 + numRows / 2, 1 + numRows / 2, numRows);
        
        System.out.println("----------------------");
        System.out.println("Simulation at Time " + sim.getTime());
        
        for(int beingIndex = 0; beingIndex < beings.size(); beingIndex++) {
            LivingBeing being = (LivingBeing)beings.get(beingIndex);
            System.out.println(being.getName() + " energyLevel = " + being.getEnergy());
        }

        for(int row = sim.getFirstRow(); row <= sim.getLastRow(); row++) {
            lake.startRow();
            for(int column = sim.getFirstColumn(); column <= sim.getLastColumn(); column++){
                String cellBgColor = "aqua";
                HtmlImage cellImage = blankImage;
                Vector cohabitants = sim.getNeighbors(row, column, 0);
                
                for(int beingIndex = 0; beingIndex < cohabitants.size(); beingIndex++){
                    LivingBeing being = (LivingBeing)cohabitants.get(beingIndex);
                    
                    if(being.getDisplayMechanism() == "color")
                        cellBgColor = being.getColor();
                    else if(being.getDisplayMechanism() == "image")
                        cellImage = new HtmlImage(being.getImage(), being.getName());
                }
                lake.addCell(cellBgColor, cellImage.buildHtml());
            }
            lake.endRow();
        }
        simulationPage.addText(lake.buildHtml());
        return simulationPage.buildHtml();
    }     
}