//this should not run on next frame, or balls will return.
//calculate the ball angle and velocity, and execute.
public void calculateBallCollision(Ball otherBall)
{
double collisionTangent = Math.Atan2((double)yDist, (double)xDist); //returns the angle of the tangent of the vector which is the collision x and y distance.
double sin = Math.Sin(collisionTangent);
double cos = Math.Cos(collisionTangent);
//rotate ball 0 pos
double B0x = 0;//relative x & y pos set
double B0y = 0;
//set ball 1 pos relative to ball 0, aka distance.
double B1x = xDist * cos + yDist * sin;//RELATIVE TO BALL 0!!!
double B1y = yDist * cos - xDist * sin;
//rotate ball 0 velocity
double V0x = xSpeed * cos + ySpeed * sin;
double V0y = ySpeed * cos - xSpeed * sin;
//rotate ball 1 velocity
double V1x = otherBall.xSpeed * cos + otherBall.ySpeed * sin;
double V1y = otherBall.ySpeed * cos - otherBall.xSpeed * sin;
//collision reaction ELASTISK LIGNING
double vxtotal = V0x - V1x;
V0x = ((mass - otherBall.getMass()) * V0x + 2 * otherBall.getMass() * V1x) / (mass + otherBall.getMass());//new velocity x ball 1
V1x = vxtotal + V0x; //new velocity x ball 2
//update position, THIS ONE IS RELATIVE TO MID BALL 0 and BALL 1
B0x += V0x;
B1x += V1x;
//rot pos back? SET NEW POSITION. BALLS SHOULD OVERLAP AFTER THIS.
double B0newPosx = B0x * cos - B0y * sin;
double B0newPosy = B0y * cos + B0x * sin;
double B1newPosx = B1x * cos - B1y * sin;
double B1newPosy = B1y * cos + B1x * sin;
//rot vel back
double B0newVelx = V0x * cos - V0y * sin;
double B0newVely = V0y * cos + V0x * sin;
double B1newVelx = V1x * cos - V1y * sin;
double B1newVely = V1y * cos + V1x * sin;
//update position
otherBall.xPos = xPos + (float)B1newPosx;//is this just to set it out of the other balls's radius
otherBall.yPos = yPos + (float)B1newPosy;
xPos = xPos + (float)B0newPosx;//these 4 new positions will be a little "bigger" than when they entered. this is so that they wont stick. also, they point slightly away from each other.
yPos = yPos + (float)B0newPosy;
//update speed
xSpeed = (float)B0newVelx;
ySpeed = (float)B0newVely;
otherBall.setXspeed((float)B1newVelx);
otherBall.setYspeed((float)B1newVely);
}
public void InitializeBallz()
{
Ballz[0] = new Ball(pad.getX(), padPosy-10, startBallspeedX, forceVal, radius, false, 0);//xPos, yPos, xSpeed, ySpeed, radius, inPlay, gravity value
Ballz[1] = new Ball(1000, botWall - radius, 0, 0, radius, false,gravity);//all other balls start off to the bottom right corner.
Ballz[2] = new Ball(1000, botWall - radius, 0, 0, radius, false,gravity);
Ballz[3] = new Ball(1000, botWall - radius, 0, 0, radius, false,gravity);
Ballz[4] = new Ball(1000, botWall - radius, 0, 0, radius, false,gravity);
}
//drop a new ball from CheckCollision()
public void DropNewBall(int b, int f)
{
int count = 0;//used count and while loop since the "count" must be changed when a ball is being activated, so that we don't put out more than one ball.
while(count < Ballz.Length)
{
if(!Ballz[count].inPlay)//if the ball is not yet in play, we can deploy it.
{
Ballz[count] = new Ball(Brickz[b].getX(),Brickz[b].getY(), Ballz[f].getXspeed() , Ballz[f].getYspeed(), radius, true, gravity);//sets new balls' position(the brick), and speeds(colliding ball's speed)
numBallsActive += 1;//keep track for update purposes
count = Ballz.Length;//exits loop
}
count++;
}
}
public void InitializeBallz()
{
Ballz[0] = new Ball(pad.getX(), padPosy-10, 0, 0, radius, true);//xPos, yPos, xSpeed, ySpeed, radius, inPlay
Ballz[1] = new Ball(1000, botWall - radius, 0, 0, radius, false);
Ballz[2] = new Ball(1000, botWall - radius, 0, 0, radius, false);
Ballz[3] = new Ball(1000, botWall - radius, 0, 0, radius, false);
Ballz[4] = new Ball(1000, botWall - radius, 0, 0, radius, false);
}
//drop a new ball from CheckCollision()
public void DropNewBall(int b, int f)
{
int count = 0;
while(count < Ballz.Length)
{
if(!Ballz[count].inPlay)
{
Ballz[count] = new Ball(Brickz[b].getX(),Brickz[b].getY(), Ballz[f].getXspeed() , Ballz[f].getYspeed(), radius, true);
numBallsActive += 1;
count = Ballz.Length;
}
count++;
}
}
//this should not run on next frame, or balls will return.
//calculate the ball angle and velocity, and execute.
public void calculateBallCollision(Ball otherBall)
{
double collisionTangent = Math.Atan2((double)yDist, (double)xDist); //returns the angle of the tangent of the vector which is the collision x and y distance.
double sin = Math.Sin(collisionTangent);
double cos = Math.Cos(collisionTangent);
//rotate ball 0 pos
double B0x = 0;//relative x & y pos set
double B0y = 0;
//set ball 1 pos relative to ball 0, aka distance.
double B1x = xDist * cos + yDist * sin;//RELATIVE TO BALL 0!!!
double B1y = yDist * cos - xDist * sin;
//rotate ball 0 velocity
double V0x = xSpeed * cos + ySpeed * sin;
double V0y = ySpeed * cos - xSpeed * sin;
//rotate ball 1 velocity
double V1x = otherBall.xSpeed * cos + otherBall.ySpeed * sin;
double V1y = otherBall.ySpeed * cos - otherBall.xSpeed * sin;
//collision reaction ELASTISK LIGNING I BOKA?, tror denne gjør at de ikke setter seg fast, må plusse på noe ekstra? eller ikke siden det er vel.
double vxtotal = V0x - V1x;
V0x = ((mass - otherBall.getMass()) * V0x + 2 * otherBall.getMass() * V1x) / (mass + otherBall.getMass());//new velocity x ball 1
V1x = vxtotal + V0x; //new velocity x ball 2
//update position, THIS ONE IS RELATIVE TO MID BALL 0 and BALL 1
B0x += V0x;
B1x += V1x;
//rot pos back? SET NEW POSITION. BALLS SHOULD OVERLAP AFTER THIS.
double B0newPosx = B0x * cos - B0y * sin;
double B0newPosy = B0y * cos + B0x * sin;
double B1newPosx = B1x * cos - B1y * sin;
double B1newPosy = B1y * cos + B1x * sin;
//rot vel back?
double B0newVelx = V0x * cos - V0y * sin;
double B0newVely = V0y * cos + V0x * sin;
double B1newVelx = V1x * cos - V1y * sin;
double B1newVely = V1y * cos + V1x * sin;
//update pos
otherBall.xPos = xPos + (float)B1newPosx;//is this just to set it out of the other balls radius?
otherBall.yPos = yPos + (float)B1newPosy;
xPos = xPos + (float)B0newPosx;//these 4 new positions will be a little "bigger" than when they entered. this is so that they wont stick. also, they point slightly away from each other.
yPos = yPos + (float)B0newPosy;
//update vel - I WANT THEM TO HAVE PERMANENT SPEEDS if not, I can rearrange the code again.
xSpeed = (float)B0newVelx > 0 ? 2 : -2;
//xSpeed = (float)B0newVelx;
ySpeed = (float)B0newVely > 0 ? 2 : -2;
//ySpeed = (float)B0newVely;
otherBall.setXspeed((float)B1newVelx > 0 ? 2 : -2);
//otherBall.setXspeed((float)B1newVelx);
otherBall.setYspeed((float)B1newVely > 0 ? 2 : -2);
//otherBall.setYspeed((float)B1newVely);
/* //old velocity
double V0Ball1x = xSpeed * cos;
double V0Ball1y = ySpeed * sin;
double V0Ball2x = otherBall.getXspeed() * cos;
double V0Ball2y = otherBall.getYspeed() * sin;
//new velocity
double V1Ball1x = ((mass - otherBall.getMass()) / (mass + otherBall.getMass())) * V0Ball1x + (2 * otherBall.getMass() / (mass + otherBall.getMass())) * V0Ball2x;
double V1Ball1y = (2 * mass / (mass + otherBall.getMass())) * V0Ball1x + ((otherBall.getMass() - mass) / (otherBall.getMass() + mass)) * V0Ball2x;
double V1Ball2x = V0Ball1y;
double V1Ball2y = V0Ball2y;
//set new velocity
xSpeed = (float)V1Ball1x;
ySpeed = (float)V1Ball1y;
xPos += xSpeed *3;
yPos += ySpeed *3;
otherBall.setXspeed((float)V1Ball2x);
otherBall.setYspeed((float)V1Ball2y);
otherBall.xPos += otherBall.xSpeed * 5;
otherBall.yPos += otherBall.ySpeed *5;*/
}
//check if balls collide
public bool checkBallCollision(Ball otherBall)
{
xDist = otherBall.getX()-xPos;//dx
yDist = otherBall.getY()-yPos;//dy
float radDist = radius + otherBall.getRadius();
if (radDist * radDist >= (xDist * xDist + yDist * yDist) && inPlay == true && otherBall.inPlay == true) //check if distance is bigger than the balls touching range
{
return true;
}
else
{
return false;
}
}
