truck.java

一些JAVA的小程序

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

public class truck extends vehicle{
    final static int LIspeed=4;//the speed is assigned for straight road;
    final static int CIspeed=2;//the speed is assigned for curve road;


    public truck(int xPosition, int yPosition,int angle1){
        super(xPosition,yPosition,angle1);
        safeSecond=0;
    }

    public void draw(Graphics g){
        g.setColor(Color.green);
        g.drawOval(x-5,y-5,10,10);
        g.fillOval(x-5,y-5,10,10);
    }

    //check if a vehicle can enter road from a station
    public boolean canEnter(){
        return !(mateVehi.angle>240 && mateVehi.angle<300 && mateVehi.stayStation==0);
    }

    //check if A truck can hit another truck
    public boolean canHit(){
        if (angle==0 && mateVehi.angle==0){
            return (y-mateVehi.y<=15 && y-mateVehi.y>0);
        }
        else if (angle==180 && mateVehi.angle==180){
            return (mateVehi.y-y<=15 && mateVehi.y-y>0);
        }
        else if (angle>=0 && angle<=180 && mateVehi.angle>=0 && mateVehi.angle<=180){
            if (mateVehi.x>x){return false;}
            else{
                 int xDif=Math.abs(x-mateVehi.x);
                 int yDif=Math.abs(y-mateVehi.y);
                 return (xDif*xDif+yDif*yDif<225);
            }
        }
        else{
            if (mateVehi.x<x){return false;}
            else{
                 int xDif=Math.abs(x-mateVehi.x);
                 int yDif=Math.abs(y-mateVehi.y);
                 return (xDif*xDif+yDif*yDif<225);
            }
        }
    }

    //check if a vehicle is close enough to one intersection
    public boolean closeToCross(leverage oneleve){
//        if (angle==0 && Math.abs(x-oneleve.x)<20){
        if (angle==0 && Math.abs(x-oneleve.x)<20){
            return (y-(oneleve.y-15)<=30 && y-(oneleve.y-15)>20);
        }
//        else if (angle==180 && Math.abs(x-oneleve.x)<20){
        else if (angle==180 && Math.abs(x-oneleve.x)<20){
            return ((oneleve.y+15)-y<=30 && (oneleve.y+15)-y>20);
        }
        else {return false;}
    }

    public void move(){
        //make choice to stay Station
        if (angle<270 && angle>=270-CIspeed){
           if (canStay()){
               stayStation();
               if (mateVehi.stayStation!=0){
                   setPosition(centerX,centerY+225);
               }
               else{
                   setPosition(centerX,centerY+210);
               }
               angle=270;

               return; //stay in station
           }
        }

        if (stayStation!=0){
           if (stayStation==1){
               //when canEnter() is false, the truck keep its stayStation=1
               if (canEnter()){
                  setPosition(centerX,centerY+250);
                  stayStation=0;
               }
           }
           else{stayStation--;}

           return;
        }

        //A truck may start walking in the curve part of the road;
        if (angle==0 && (y-LIspeed)<(centerY-150)){
            angle=0;
            setPosition(centerX+100,centerY-150);
        }
        if (angle==180 && (y+LIspeed)>(centerY+150)){
            angle=180;
            setPosition(centerX-100,centerY+150);
        }

        //A truck may start walking in the straight part of the road;
        if (angle<360 && angle+CIspeed>=360){
            angle=0;
            setPosition(centerX+100,centerY+150);
            return;
        }
        if (angle<180 && angle+CIspeed>=180){
            angle=180;
            setPosition(centerX-100,centerY-150);
            return;
        }

        //walk in straight line or curve circle;
        if (angle==0 && !(y==centerY-150)){
            setPosition(x,y-LIspeed);
        }
        else if (angle==180 && !(y==centerY+150)){
            setPosition(x,y+LIspeed);
        }
        else if (angle>=0 && angle<180){
            //y0=centerY-150, x0=centerX is the origin point for up 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)+((int) Math.floor(100*Math.cos(c))),(centerY-150)-((int) Math.floor(100*Math.sin(c))));
        }
        else {
            //y0=centerY+150, x0=centerX is the origin point for down 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)+((int) Math.floor(100*Math.cos(c))),(centerY+150)-((int) Math.floor(100*Math.sin(c))));
        }

    }

}