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I have been trying to make a game similiar to pong in java. But I do not understand the concept of bouncing of the paddle. the paddle moves around in a circle. Here is the code that I have for the vector class that takes in the position of the paddle as a vector.

public class Vector {

double dx, dy;

public Vector(int x, int y) {

dx = 1.*x;

dy = 1.*y;

}

public double dot(Vector V){

return this.dx * V.dx + this.dy * V.dy;

}

public static final Vector UX = new Vector(1, 0);

public static final Vector UY = new Vector(0, 1);

public static final Vector ZERO = new Vector(0, 0);

public Vector(double dr, double theta) {

setRTheta(dr, theta);

}

private void setRTheta(double dr, double theta) {

dx = dr*Math.cos(theta);

dy = dr*Math.sin(theta);

}

public void setX(int x){

dx = x;

}

public void setY(int y){

dy = y;

}

public int getX(){

return (int)dx;

}

public int getY(){

return (int)dy;

}

public double getR() {

return Math.hypot(dx, dy);

}

public double getTheta() {

return Math.atan2(dy, dx);

}

public Vector multiply(double d) {

return new Vector(this.dx * d, this.dy * d);

}

public void add(Vector v) {

dx += v.dx;

dy += v.dy;

}

public Vector subtract(Vector v)

{

return new Vector(this.dx - v.dx, this.dy - v.dy);

}

public void reflect(double angle) {

setRTheta(-getR(), 2*angle-getTheta());

}

public void reflectP(Vector v){

Vector unitVector = new Vector(v.dx/Math.sqrt(v.dx * v.dx + v.dy * v.dy), v.dy/Math.sqrt(v.dx * v.dx + v.dy * v.dy));

double dotProduct = this.dot(unitVector);

Vector result = unitVector.multiply(2 * dotProduct).subtract(this);

dx = result.dx;

dy = result.dy;

// dx = dx - 2*(v.dx/Math.sqrt(v.dx * v.dx + v.dy * v.dy) + this.dx) * //v.dx/Math.sqrt(v.dx * v.dx + v.dy * v.dy);

// dy = dy - 2*(v.dy/Math.sqrt(v.dx * v.dx + v.dy * v.dy) + this.dy) * //v.dy/Math.sqrt(v.dx * v.dx + v.dy * v.dy);

}

public String toString(){

return " " + dx + " " + dy;

}

}

Can somebody please help me with this???

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# Game like circular pong

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