This site requires JavaScript, please enable it in your browser!
Greenfoot back
Twitter Twitter.hover
RedCreeper
RedCreeper wrote ...

2016/4/17

How do I make the player strafe left and right?

RedCreeper RedCreeper

2016/4/17

#
I have it so that the player turns toward the mouse and move back and forth with the W and S keys, but I am not quite sure how to make the player move left and right, while staying relative to the rotation of the player. Please help and thank you!! I have included the code for the player: 
import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)

/**
 * Write a description of class Player here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class Player extends SmoothMover
{
    public boolean atWorldEdge = false;
    private double WalkSpeed = 3.0;
    private int TurnSpeed = 5;
    public boolean Alive;
    public double Health = 100;
    public int Ammo = 100;
    private boolean isShooting;
    public int XPos;
    public int YPos;
    private boolean Moving;
    private float Rotation;
    private int DamageDelay = 1;
   
    
    GreenfootImage[] images = new GreenfootImage[20]; 
    private int imageNumber;
    
    public Player()
    {
        for( int i=0; i<images.length; i++ )
        {
            images[i] = new GreenfootImage( "survivor-move_shotgun_" + i + ".png" );
        }
        setImage( images[imageNumber] );
      
    }
    
    /**
     * Act - do whatever the Player wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act() 
    {
       XPos = getX(); 
       YPos = getY();
        if(Health > 0)
       {
           KeyboardInput();
          
           Rotation = getRotation();
           CheckCollision();
           if(Moving == true)
           {
               Animate();
            }
        }
        else 
        {
            getWorld().removeObject(this);
        }
    }    
    
    /**
     * KeyboardInput - Gets the keyboard keys that are pressed and acts on it.
     */
    public void KeyboardInput()
    {
         if(Greenfoot.isKeyDown("w"))
        {
            move(WalkSpeed);
            Moving = true;
        }
        else if(Greenfoot.isKeyDown("s"))
        {
            move(-WalkSpeed);
            Moving = true;
        }
        else 
        {
            Moving = false;
            imageNumber = 0;
        }
        MouseInfo mouse = Greenfoot.getMouseInfo(); 
         
        if (mouse != null && mouse.getX() != this.getX() && mouse.getY() != this.getY()) 
        {  
           turnTowards(mouse.getX(), mouse.getY());  
        }
        // if(Greenfoot.isKeyDown("left"))
        // {
            // turn(-TurnSpeed);
        // }
        // else if(Greenfoot.isKeyDown("right"))
        // {
            // turn(TurnSpeed);
        // }
        // if(Greenfoot.isKeyDown("space"))
        // {
            // isShooting = true;
            // Shoot();
        // }
        // else 
        // {
            // isShooting = false;
        // }
    }
    
    public void Animate()
    {
        imageNumber = ( imageNumber + 1 ) % images.length;
        setImage( images[imageNumber] );
    }
    
    public void Shoot()
    {
            getWorld().addObject(new Bullet(getRotation()), getX(), getY());
    }
    
    public void CheckCollision()
    {
        if(getOneIntersectingObject(Zombie.class) != null)
        {
            DamageDelay--;
            if(DamageDelay <= 0)
            {
                Health = Health - 0.1;
                DamageDelay = 1;
            }
        }
    }
}
danpost danpost

2016/4/17

#
For left: 
turn(-90);
move(<?>)
turn(90);
For right, reverse the order of the lines.
RedCreeper RedCreeper

2016/4/20

#
Sorry about the delay, but what do you mean by move(<?>) ? Thank You!
danpost danpost

2016/4/20

#
Just replace the '<?>' with the numeric value representing how far you want the actor to move sidesways with respect to moving toward the mouse.
RedCreeper RedCreeper

2016/4/20

#
Sorry that was a dumb questions. However, when I try to make the character move to the right it doesn't seem to work. Going to the left does however. Here is the code for the player moving right: 
if(Greenfoot.isKeyDown("d"))
{
turn(90);
move(WalkSpeed);
turn(-90);
}
danpost danpost

2016/4/21

#
RedCreeper wrote...
Sorry that was a dumb questions. However, when I try to make the character move to the right it doesn't seem to work. Going to the left does however. Here is the code for the player moving right: < Code Omitted >
Does it make a difference where the mouse is? or is it always the right that has problems? and what code did you use to go left?
RedCreeper RedCreeper

2016/4/21

#
As far as moving left, it seems to work where ever the mouse is. I don't know if using the turnTowards method stops the movement to the right (line: 87). For the code to the left i am using: 
if(Greenfoot.isKeyDown("a"))
{
turn(-90);
move(WalkSpeed);
turn(90);
}
danpost danpost

2016/4/21

#
Okay, show both the 'moveLeft' and 'moveRight' methods along with the 'act' method (for now).
RedCreeper RedCreeper

2016/4/21

#
Sorry, It seems that the code works now, for some reason my computer wasn't responding to the code and with a restart of greenfoot it seems to work. Thank you!!
You need to login to post a reply.