train.java

一些JAVA的小程序

import java.util.*;
import java.lang.*;
import java.awt.*;

public class train extends vehicle{
    final static int LIspeed=6;//the speed is assigned for straight road;
    final static int CIspeed=4;//the speed is assigned for curve road;

    public train(int xPosition, int yPosition,int angle1){
        super(xPosition,yPosition,angle1);
    }

    public void draw(Graphics g){
        g.setColor(Color.blue);
        g.drawRect(x-5,y-5,10,10);
        g.fillRect(x-5,y-5,10,10);
    }

    //check if a vehicle can enter road from a station
    public boolean canEnter(){
        return !((mateVehi.angle>330 || mateVehi.angle<30) && mateVehi.stayStation==0);
    }

    //canHit() A train can never hit another train since whenever they stop they are in station

    //check if a vehicle is close enough to one intersection
    public boolean closeToCross(leverage oneleve){
        if (angle==90 && Math.abs(y-oneleve.y)<20){
            return (x-(oneleve.x+10)<=60 && x-(oneleve.x+10)>0);
        }
        else if (angle==270 && Math.abs(y-oneleve.y)<20){
            return ((oneleve.x+10)-x<=60 && (oneleve.x+10)-x>0);
        }
        else {return false;}
    }

    public boolean passedCross(leverage oneleve){
        if (angle==90 && Math.abs(y-oneleve.y)<20){
            return ((oneleve.x+10)-x>=40);
        }
        else if (angle==270 && Math.abs(y-oneleve.y)<20){
            return (x-(oneleve.x+10)>=40);
        }
        else {return true;}

    }
/*
    public void outOfStation(Graphics g){
        g.setColor(Color.red);
        g.fillRect(x,y,10,10);
    }
*/

    public void move(){
        //make choice to stay Station
        if (angle<360 && angle>=360-CIspeed){
           if (canStay()){
               stayStation();
               if (mateVehi.stayStation!=0){
                   setPosition(centerX+225,centerY);
               }
               else{
                   setPosition(centerX+210,centerY);
               }
               angle=0;
//               isRunning=false;

               return; //stay in station
           }
        }

        if (stayStation!=0){
           if (stayStation==1){
               //when canEnter() is false, the train keep its stayStation=1
               if (canEnter()){
//                  outOfStation();//clear the image of this train from the station
                  setPosition(centerX+250,centerY);
                  stayStation=0;
//                  isRunning=true;
               }
           }
           else{stayStation--;}

           return;
        }


        //A train may start walking in the curve part of the road;
        if (angle==90 && (x-LIspeed)<(centerX-150)){
            angle=90;
            setPosition(centerX-150,centerY-100);
        }
        if (angle==270 && (x+LIspeed)>(centerX+150)){
            angle=270;
            setPosition(centerX+150,centerY+100);
        }

        //A train may start walking in the straight part of the road;
        if (angle<90 && angle+CIspeed>=90){
            angle=90;
            setPosition(centerX+150,centerY-100);
            return;
        }
        if (angle<270 && angle+CIspeed>=270){
            angle=270;
            setPosition(centerX-150,centerY+100);
            return;
        }

        //walk in straight line or curve circle;
        if (angle==90 && !(x==centerX-150)){
            setPosition(x-LIspeed,y);
        }
        else if (angle==270 && !(x==centerX+150)){
            setPosition(x+LIspeed,y);
        }
        else if (angle>=90 && angle<270){
            //x0=centerX-150, y0=centerY is the origin point for left half circle;
            //x=x0+r*cos(angle), y=y0-r*sin(angle) to truck the trace of circle
            angle=(angle+CIspeed)%360;
            double c=(double) ((double) angle)*Math.PI/180;
            setPosition((centerX-150)+((int) Math.floor(100*Math.cos(c))),centerY-((int) Math.floor(100*Math.sin(c))));
        }
        else {
            //x0=centerX+150, y0=centerY is the origin point for right half circle;
            //x=x0+r*cos(angle), y=y0-r*sin(angle) to truck the trace of circle
            angle=(angle+CIspeed)%360;
            double c=(double) ((double) angle)*Math.PI/180;
            setPosition((centerX+150)+((int) Math.floor(100*Math.cos(c))), centerY-((int) Math.floor(100*Math.sin(c))));
        }

    }

}