import java.awt.*;
import java.applet.*;

class Ship{
	 public void draw (Graphics g){  //Draws the ship at the current position
           g.setColor(Color.white);
           double dRadians = myPointDirection*(Math.PI/180);
			//convert degrees to radians for sin and cos

           int nXcorner1 =16;
   		   int nYcorner1 = 0;
           int nXcorner2 =-8;
           int nYcorner2 = - 8;
           int nXcorner3 = -8;
           int nYcorner3 = 8;
			//coordinates of corners of ship if center is (0,0)
			//and direction is zero degrees (pointing to right)
			//change these values to change size of ship

           int nXrotate1 = (int)((nXcorner1 * Math.cos(dRadians)) - (nYcorner1 * Math.sin(dRadians))+myCenterX);
           int nYrotate1 = (int)((nXcorner1 * Math.sin(dRadians)) + (nYcorner1 * Math.cos(dRadians))+myCenterY);
           int nXrotate2 = (int)((nXcorner2 * Math.cos(dRadians)) - (nYcorner2 * Math.sin(dRadians))+myCenterX);
           int nYrotate2 = (int)((nXcorner2 * Math.sin(dRadians)) + (nYcorner2 * Math.cos(dRadians))+myCenterY);
           int nXrotate3 = (int)((nXcorner3 * Math.cos(dRadians)) - (nYcorner3 * Math.sin(dRadians))+myCenterX);
           int nYrotate3 = (int)((nXcorner3 * Math.sin(dRadians)) + (nYcorner3 * Math.cos(dRadians))+myCenterY);
			//rotate and translate the coordinates of the ship to current direction

           g.drawLine (nXrotate1,nYrotate1,nXrotate2, nYrotate2);
           g.drawLine (nXrotate1,nYrotate1,nXrotate3, nYrotate3);
           g.drawLine (nXrotate2,nYrotate2,nXrotate3, nYrotate3);
			//draw the lines for the ship
     }
	 public void move (){  //Moves the ship towards the coordinates
						//myDirectionX and myDirectionY
        myCenterX += myDirectionX;
        myCenterY += myDirectionY;
        //move the ship in the current direction of travel

        if(myCenterX >640)
	       myCenterX = 0;
        else if (myCenterX<0)
	       myCenterX = 640;
        if(myCenterY >480)
	       myCenterY = 0;
        else if (myCenterY < 0)
	       myCenterY = 480;
        //wrap around screen
    }

	 public void accelerate (double dAmount){  //Accelerates the ship in
					   //the direction it is pointing
					   //(myPointDirection)
        double dRadians =myPointDirection*(Math.PI/180);
        //the current direction the ship is pointing to radians

        myDirectionX += ((dAmount) * Math.cos(dRadians));
        myDirectionY += ((dAmount) * Math.sin(dRadians));
        //change coordinates of direction of travel

     }

	 void rotate (int nDegreesOfRotation){  //rotates the ship
					   //by a given number of degrees
        myPointDirection+=nDegreesOfRotation;
     }

	 public double returnX(){return myCenterX;} //returns the current X
					   //coordinate of the center of the ship
					   //useful to check for collisions

	 public double returnY(){return myCenterY;} //returns the current Y
					   //coordinate of the center of the ship
						//useful to check for collisions
	 public int returnDirection(){return (int) myPointDirection;}
					   //Returns the current direction the ship is
					   //pointing, useful for shooting

	 Ship(){   //constructor
	     
        myCenterX = nSCREEN_WIDTH/2;
        myCenterY = nSCREEN_HEIGHT/2;
        //place ship at center of screen
        myDirectionX = 0;
        myDirectionY = 0;
        //Intialize ship with no momentum
        myPointDirection=0;
        //Ship points to right
   
     }
     public static final int nSCREEN_WIDTH = 640;
     public static final int nSCREEN_HEIGHT = 480;
   
	 private double myCenterX,myCenterY; //holds center coordinates of the ship

	 private double myDirectionX, myDirectionY; //holds x and y coordinates of
					   //the vector for direction of travel

	 private double myPointDirection; //holds current direction the ship is
					   //pointing in degrees

     
}