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Thread: Vector implementation

  1. #1
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    Default Vector implementation

    Hi,

    I'm currently studying Java and have an assignment to create a pool game. I have the bulk of the work done but I am having issues with implementing 2d vectors. I have not been shown this and am trying to work my way through it but cannot find anything which gives suitable explanations for the 2d vector which I am trying to create. I have written a vector class which I have displayed below but need to implement it in my main class. I need to divide the table into a number of squares of my choosing. I then must perform addition of the vectors and determine the new position of the ball objects. I hope someone can help me as I am at a loss at the moment. Also if there is anything else which I should add suggestions will be greatly appreciated. If anyone wants to look at my other classes then they are more than welcome to.

    Thanks in advance

    poolMan81

    import java.awt.*;
    import java.util.*;
     
    //Vector class which contains the code for performing the collisions between the balls
    public class Vector2 {
     
    	private double x, y;
     
    	public Vector2(double x, double y){
     
    		this.x = x;
    		this.y = y;
     
    	}
     
    	public double getX(){
     
    		return this.x;
     
    	}
     
    	public double getY(){
     
    		return this.y;
     
    	}
     
    	public void setVector2(double x, double y) {
     
    		this.x = x;
    		this.y = y;
     
    	}
     
    	public double magnitude(){
     
    		return Math.sqrt(x * x + y * y);
     
    	}
     
    	public static Vector2 addVector (Vector2 a, Vector2 b) {
     
    		double sumX = a.getX() + b.getX();
    		double sumY = a.getY() + b.getY();
    		return new Vector2 (sumX, sumY);
     
    	}
     
    	public static Vector2 scaleVector(double scale, Vector2 d) {
     
    		return new Vector2 (scale * d.getX(), scale * d.getY());
     
    	}


  2. #2
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    Default Re: Vector implementation

    I'm honestly not sure what your actual question is. You might consider posting an SSCCE that demonstrates exactly what problem you're encountering.
    Useful links: How to Ask Questions the Smart Way | Use Code Tags | Java Tutorials
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  3. #3
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    Default Re: Vector implementation

    Sorry about that. My question really is how do I go about implementing this code within my main and or other classes in order to divide my table into vectors? These vectors will then be used to determine the position of the balls before the next shot is taken. I have attached my code which contains 3 classes. Please ignore the comments as I have to enter them for my project.
    Attached Files Attached Files

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    Default Re: Vector implementation

    People are pretty wary of downloading zip files like that. An SSCCE should be able to be copied and pasted into our own editors so we can see what you're talking about.

    But I would expect you would have to create instances of your Vector class, passing in the appropriate information. Recommended reading: Creating Objects (The Java™ Tutorials > Learning the Java Language > Classes and Objects)
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  5. #5
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    Default Re: Vector implementation

    2d vector which I am trying to create.
    Can you explain what a two dimensional vector is? Would it be the same as the Java SE Vector class except it would take two index values in place of one? For example:
    public E get(int index1, index2)
    public boolean add(int index, E e)
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Vector implementation

    Thanks that's a great document. I understand how to give the initial coordinates but how do you create the size of each square and the amount of squares on the plane? Is this done individually with the add() method? Sorry if this seems like a stupid question but I've never used vectors before so just trying to get my head around it.

    Thanks for your help.

  7. #7
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    Default Re: Vector implementation

    Yes a 2d vector takes to values. The x and y coordinates of an object. As for the similarities of the 2 I can't say as I'm new to vectors myself.

  8. #8
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    Default Re: Vector implementation

    You definition of vector seems closer to that of a point. The x,y location of something.
    If you don't understand my answer, don't ignore it, ask a question.

  9. #9
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    Default Re: Vector implementation

    Yeah a point can be used too for my problem but vectors were suggested by my lecturer.

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    Default Re: Vector implementation

    I guess you can call it whatever you want.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Vector implementation

    owrite lets gonna change

  12. #12
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    Default Re: Vector implementation

    it work bro

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