// Calculate the projection of a polygon on an axis
// and returns it as a [min, max] interval
void ProjectTriangle2D(Vector2f axis, Vector2f *triangle, float &min, float &max) {
float dotProduct = axis.Dot(triangle[0]);
min = dotProduct;
max = dotProduct;
for (int i = 0; i < 3; i++)
{
float d = triangle[i].Dot(axis);
if (d < min)
min = d;
else if(d > max)
max = d;
}
}
void Player::Update(float elapsed)
{
//Add friction into the acceleration.
//If the player isn't accelerating, slow down his velocity completely.
if (Acceleration.x == 0.0f && Acceleration.y == 0.0f)
{
if (Velocity.x != 0.0f || Velocity.y != 0.0f)
{
Acceleration = -Velocity * LevelConstants::Instance.PlayerFriction;
}
}
else
{
//Split the acceleration and velocity into "forward" and "side" components.
Vector2f forward = LookDir.XY().Normalized(),
side = Vector2f(forward.y, forward.x),
forwardA = forward * forward.Dot(Acceleration),
forwardV = forward * forward.Dot(Velocity),
sideA = side * side.Dot(Acceleration),
sideV = side * side.Dot(Velocity);
//Add friction to any velocity components that go against the acceleration.
if (forwardA.Dot(forwardV) < 0.0f && (abs(forwardV.x) > 0.00001f || abs(forwardV.y) > 0.00001f))
{
Acceleration -= forwardV.Normalized() * LevelConstants::Instance.PlayerFriction;
}
if (sideA.Dot(sideV) < 0.0f && (abs(sideV.x) > 0.00001f || abs(sideV.y) > 0.00001f))
{
Acceleration -= sideV.Normalized() * LevelConstants::Instance.PlayerFriction;
}
}
//Update velocity and acceleration.
Velocity += Acceleration * elapsed;
Acceleration = Vector2f();
//Constrain the velocity.
float speedSqr = Velocity.LengthSquared();
if (speedSqr > LevelConstants::Instance.PlayerMaxSpeed * LevelConstants::Instance.PlayerMaxSpeed)
{
Velocity = (Velocity / sqrtf(speedSqr)) * LevelConstants::Instance.PlayerMaxSpeed;
}
//Update position.
TryMove(elapsed);
//Handle weapons.
if (Fire)
{
if (!firedLastFrame)
{
firedLastFrame = true;
GetCurrentWeapon()->StartFire();
}
Fire = false;
}
else if (firedLastFrame)
{
GetCurrentWeapon()->StopFire();
firedLastFrame = false;
}
GetCurrentWeapon()->Update(elapsed);
}
