public static BallStepResult Step(
PhysicsProperties physicsProperties,
Entity entity,
ref float entityAngularVelocity,
IBallContactListener listener)
{
Vector2 position = entity.position;
Vector2 velocity1 = entity.velocity;
Vector2 size = entity.Size;
float num1 = entityAngularVelocity;
float num2 = size.X * 0.5f;
float num3 = num1 * physicsProperties.Drag;
Vector2 vector2_1 = velocity1 * physicsProperties.Drag;
float num4 = vector2_1.Length();
if ((double)num4 > 1000.0)
{
vector2_1 = 1000f * Vector2.Normalize(vector2_1);
num4 = 1000f;
}
int num5 = Math.Max(1, (int)Math.Ceiling((double)num4 / 2.0));
float timeScale = 1f / (float)num5;
Vector2 velocity2 = vector2_1 * timeScale;
float angularVelocity = num3 * timeScale;
float num6 = physicsProperties.Gravity / (float)(num5 * num5);
bool flag = false;
for (int index = 0; index < num5; ++index)
{
velocity2.Y += num6;
BallPassThroughType type;
Tile tile;
if (BallCollision.CheckForPassThrough(position + size * 0.5f, out type, out tile))
{
if (type == BallPassThroughType.Tile && Main.tileSolid[(int)tile.type] && !Main.tileSolidTop[(int)tile.type])
{
velocity2 *= 0.0f;
angularVelocity *= 0.0f;
flag = true;
}
else
{
BallPassThroughEvent passThrough = new BallPassThroughEvent(timeScale, tile, entity, type);
listener.OnPassThrough(physicsProperties, ref position, ref velocity2, ref angularVelocity, ref passThrough);
}
}
position += velocity2;
if (!BallCollision.IsBallInWorld(position, size))
{
return(BallStepResult.OutOfBounds());
}
Vector2 collisionPoint;
if (BallCollision.GetClosestEdgeToCircle(position, size, velocity2, out collisionPoint, out tile))
{
Vector2 normal = Vector2.Normalize(position + size * 0.5f - collisionPoint);
position = collisionPoint + normal * (num2 + 0.0001f) - size * 0.5f;
BallCollisionEvent collision = new BallCollisionEvent(timeScale, normal, collisionPoint, tile, entity);
flag = true;
velocity2 = Vector2.Reflect(velocity2, collision.Normal);
listener.OnCollision(physicsProperties, ref position, ref velocity2, ref collision);
angularVelocity = (float)((double)collision.Normal.X * (double)velocity2.Y - (double)collision.Normal.Y * (double)velocity2.X) / num2;
}
}
Vector2 vector2_2 = velocity2 / timeScale;
float num7 = angularVelocity / timeScale;
BallStepResult ballStepResult = BallStepResult.Moving();
if (flag && (double)vector2_2.X > -0.00999999977648258 && ((double)vector2_2.X < 0.00999999977648258 && (double)vector2_2.Y <= 0.0) && (double)vector2_2.Y > -(double)physicsProperties.Gravity)
{
ballStepResult = BallStepResult.Resting();
}
entity.position = position;
entity.velocity = vector2_2;
entityAngularVelocity = num7;
return(ballStepResult);
}
public static BallStepResult Step(PhysicsProperties physicsProperties, Entity entity, float entityAngularVelocity, IBallContactListener listener)
{
Vector2 position = entity.position;
Vector2 velocity = entity.velocity;
Vector2 size = entity.Size;
float num = entityAngularVelocity;
float num2 = size.X * 0.5f;
num *= physicsProperties.Drag;
velocity *= physicsProperties.Drag;
float num3 = velocity.Length();
if (num3 > 1000f)
{
velocity = 1000f * Vector2.Normalize(velocity);
num3 = 1000f;
}
int num4 = Math.Max(1, (int)Math.Ceiling(num3 / 2f));
float num5 = 1f / (float)num4;
velocity *= num5;
num *= num5;
float num6 = physicsProperties.Gravity / (float)(num4 * num4);
bool flag = false;
for (int i = 0; i < num4; i++)
{
velocity.Y += num6;
if (CheckForPassThrough(position + size * 0.5f, out var type, out var contactTile))
{
if (type == BallPassThroughType.Tile && Main.tileSolid[contactTile.type] && !Main.tileSolidTop[contactTile.type])
{
velocity *= 0f;
num *= 0f;
flag = true;
}
else
{
BallPassThroughEvent passThrough = new BallPassThroughEvent(num5, contactTile, entity, type);
listener.OnPassThrough(physicsProperties, position, velocity, num, passThrough);
}
}
position += velocity;
if (!IsBallInWorld(position, size))
{
return(BallStepResult.OutOfBounds());
}
if (GetClosestEdgeToCircle(position, size, velocity, out var collisionPoint, out contactTile))
{
Vector2 vector = Vector2.Normalize(position + size * 0.5f - collisionPoint);
position = collisionPoint + vector * (num2 + 0.0001f) - size * 0.5f;
BallCollisionEvent collision = new BallCollisionEvent(num5, vector, collisionPoint, contactTile, entity);
flag = true;
velocity = Vector2.Reflect(velocity, collision.Normal);
listener.OnCollision(physicsProperties, position, velocity, collision);
num = (collision.Normal.X * velocity.Y - collision.Normal.Y * velocity.X) / num2;
}
}
velocity /= num5;
num /= num5;
BallStepResult result = BallStepResult.Moving();
if (flag && velocity.X > -0.01f && velocity.X < 0.01f && velocity.Y <= 0f && velocity.Y > 0f - physicsProperties.Gravity)
{
result = BallStepResult.Resting();
}
entity.position = position;
entity.velocity = velocity;
entityAngularVelocity = num;
return(result);
}