public b2World(b2Vec2 gravity)
{
m_destructionListener = null;
m_debugDraw = null;
m_bodyList = null;
m_jointList = null;
m_bodyCount = 0;
m_jointCount = 0;
m_warmStarting = true;
m_continuousPhysics = true;
m_subStepping = false;
m_stepComplete = true;
m_allowSleep = true;
m_gravity = gravity;
m_flags = b2WorldFlags.e_clearForces;
m_inv_dt0 = 0.0f;
}
public void Step(float dt, int velocityIterations, int positionIterations)
{
b2Timer stepTimer;
// If new fixtures were added, we need to find the new contacts.
if (m_flags.HasFlag(b2WorldFlags.e_newFixture))
{
m_contactManager.FindNewContacts();
m_flags &= ~b2WorldFlags.e_newFixture;
}
m_flags |= b2WorldFlags.e_locked;
b2TimeStep step;
step.dt = dt;
step.velocityIterations = velocityIterations;
step.positionIterations = positionIterations;
if (dt > 0.0f)
{
step.inv_dt = 1.0f / dt;
}
else
{
step.inv_dt = 0.0f;
}
step.dtRatio = m_inv_dt0 * dt;
step.warmStarting = m_warmStarting;
// Update contacts. This is where some contacts are destroyed.
{
b2Timer timer;
m_contactManager.Collide();
m_profile.collide = timer.GetMilliseconds();
}
// Integrate velocities, solve velocityraints, and integrate positions.
if (m_stepComplete && step.dt > 0.0f)
{
b2Timer timer;
Solve(step);
m_profile.solve = timer.GetMilliseconds();
}
// Handle TOI events.
if (m_continuousPhysics && step.dt > 0.0f)
{
b2Timer timer;
SolveTOI(step);
m_profile.solveTOI = timer.GetMilliseconds();
}
if (step.dt > 0.0f)
{
m_inv_dt0 = step.inv_dt;
}
if (m_flags.HasFlag(b2WorldFlags.e_clearForces))
{
ClearForces();
}
m_flags &= ~b2WorldFlags.e_locked;
m_profile.step = stepTimer.GetMilliseconds();
}
public b2World(b2Vec2 gravity)
{
m_destructionListener = null;
m_debugDraw = null;
m_bodyList = null;
m_jointList = null;
m_bodyCount = 0;
m_jointCount = 0;
m_warmStarting = true;
m_continuousPhysics = true;
m_subStepping = false;
m_stepComplete = true;
m_allowSleep = true;
m_gravity = gravity;
m_flags = b2WorldFlags.e_clearForces;
m_inv_dt0 = 0.0f;
// setup up our default Contact Manager
m_contactManager = new b2ContactManager();
}
public static bool HasFlag(this b2WorldFlags flag, b2WorldFlags testFlag)
{
return ((flag & testFlag) == testFlag);
}
public static bool HasFlag(this b2WorldFlags flag, b2WorldFlags testFlag)
{
return((flag & testFlag) == testFlag);
}
