void BallController::updateBalls(std::vector <Ball>& balls, Grid* grid, float deltaTime, int maxX, int maxY) {
const float FRICTION = 0.01f;
// Update our grabbed balls velocity
if (m_grabbedBall != -1) {
balls[m_grabbedBall].velocity = balls[m_grabbedBall].position - m_prevPos;
}
glm::vec2 gravity = getGravityAccel();
for (size_t i = 0; i < balls.size(); i++) {
// get handle for less typing
Ball& ball = balls[i];
// Update motion if its not grabbed
if (i != m_grabbedBall) {
ball.position += ball.velocity * deltaTime;
// Apply friction
glm::vec2 momentumVec = ball.velocity * ball.mass;
if (momentumVec.x != 0 || momentumVec.y != 0) {
if (FRICTION < glm::length(momentumVec)) {
ball.velocity -= deltaTime * FRICTION * glm::normalize(momentumVec) / ball.mass;
} else {
ball.velocity = glm::vec2(0.0f);
}
}
// Apply gravity
ball.velocity += gravity * deltaTime;
}
// Check wall collision
if (ball.position.x < ball.radius) {
ball.position.x = ball.radius;
if (ball.velocity.x < 0) ball.velocity.x *= -1;
} else if (ball.position.x + ball.radius >= maxX) {
ball.position.x = maxX - ball.radius - 1;
if (ball.velocity.x > 0) ball.velocity.x *= -1;
}
if (ball.position.y < ball.radius) {
ball.position.y = ball.radius;
if (ball.velocity.y < 0) ball.velocity.y *= -1;
} else if (ball.position.y + ball.radius >= maxY) {
ball.position.y = maxY - ball.radius - 1;
if (ball.velocity.y > 0) ball.velocity.y *= -1;
}
// Check to see if the ball moved
Cell* newCell = grid->getCell(ball.position);
if (newCell != ball.ownerCell) {
grid->removeBallFromCell(&balls[i]);
grid->addBall(&balls[i], newCell);
}
}
// Updates all collisions using the spatial partitioning
updateCollision(grid);
//// Update our grabbed ball
if (m_grabbedBall != -1) {
// Update the velocity again, in case it got changed by collision
balls[m_grabbedBall].velocity = balls[m_grabbedBall].position - m_prevPos;
m_prevPos = balls[m_grabbedBall].position;
}
}
void BallController::updateBalls(std::vector<Ball>& balls, Grid* grid, float deltaTime, int maxX, int maxY)
{
const float FRICTION = 0.001f;
if (_grabbedBall != -1)
{
balls[_grabbedBall].velocity = balls[_grabbedBall].position - _prePos;
}
glm::vec2 gravity = getGravityAccel();
for (int i = 0; i < balls.size(); i++)
{
Ball& ball = balls[i];
if (i != _grabbedBall)
{
ball.position += ball.velocity * deltaTime;
glm::vec2 momentumVec = ball.velocity * ball.mass;
if (momentumVec.x != 0 || momentumVec.y != 0)
{
if (FRICTION < glm::length(momentumVec))
{
ball.velocity -= deltaTime * FRICTION * glm::normalize(momentumVec) / ball.mass;
}
else
{
ball.velocity = glm::vec2(0.0f);
}
}
ball.velocity += gravity * deltaTime;
}
if (ball.position.x < ball.radius)
{
ball.position.x = ball.radius;
if (ball.velocity.x < 0)
{
ball.velocity.x *= -1;
}
}
else if (ball.position.x + ball.radius>= maxX)
{
ball.position.x = maxX - ball.radius - 1;
if (ball.velocity.x > 0)
{
ball.velocity.x *= -1;
}
}
if (ball.position.y < ball.radius)
{
ball.position.y = ball.radius;
if (ball.velocity.y < 0)
{
ball.velocity.y *= -1;
}
}
else if (ball.position.y + ball.radius >= maxY)
{
ball.position.y = maxY - ball.radius - 1;
if (ball.velocity.y > 0)
{
ball.velocity.y *= -1;
}
}
Cell* newCell = grid->getCell(ball.position);
if (newCell != ball.ownerCell)
{
grid->removeBallFromCell(&balls[i]);
grid->addBall(&balls[i], newCell);
}
}
updateCollision(grid);
if (_grabbedBall != -1)
{
balls[_grabbedBall].velocity = balls[_grabbedBall].position - _prePos;
_prePos = balls[_grabbedBall].position;
}
}
