protected override void Update(GameTime gameTime)
{
padState = GamePad.GetState(PlayerIndex.One);
keyState = Keyboard.GetState();
mouseState = Mouse.GetState();
if (PressedOnce(Keys.Escape, Buttons.Back))
{
Exit();
}
if (PressedOnce(Keys.M, Buttons.A))
{
multithread = !multithread;
}
if (PressedOnce(Keys.P, Buttons.A))
{
var e = World.RigidBodies.GetEnumerator();
e.MoveNext(); e.MoveNext(); e.MoveNext();
e.MoveNext(); e.MoveNext(); e.MoveNext();
e.MoveNext(); e.MoveNext(); e.MoveNext();
(e.Current as RigidBody).IsStatic = true;
e.MoveNext();
(e.Current as RigidBody).IsStatic = true;
}
if ((mouseState.LeftButton == ButtonState.Pressed &&
mousePreviousState.LeftButton == ButtonState.Released) ||
(padState.IsButtonDown(Buttons.RightThumbstickDown) &&
gamePadPreviousState.IsButtonUp(Buttons.RightThumbstickUp)))
{
var ray = Conversion.ToJitterVector(RayTo(mouseState.X, mouseState.Y));
var camp = Conversion.ToJitterVector(Camera.Position);
ray = JVector.Normalize(ray) * 100;
bool result = World.CollisionSystem.Raycast(camp, ray, RaycastCallback, out grabBody, out hitNormal, out float fraction);
if (result)
{
hitPoint = camp + (fraction * ray);
if (grabConstraint != null)
{
World.RemoveConstraint(grabConstraint);
}
var lanchor = hitPoint - grabBody.Position;
lanchor = JVector.Transform(lanchor, JMatrix.Transpose(grabBody.Orientation));
grabConstraint = new SingleBodyConstraints.PointOnPoint(grabBody, lanchor)
{
Softness = 0.01f,
BiasFactor = 0.1f
};
World.AddConstraint(grabConstraint);
hitDistance = (Conversion.ToXNAVector(hitPoint) - Camera.Position).Length();
scrollWheel = mouseState.ScrollWheelValue;
grabConstraint.Anchor = hitPoint;
}
}
if (mouseState.LeftButton == ButtonState.Pressed || padState.IsButtonDown(Buttons.RightThumbstickDown))
{
hitDistance += (mouseState.ScrollWheelValue - scrollWheel) * 0.01f;
scrollWheel = mouseState.ScrollWheelValue;
if (grabBody != null)
{
var ray = RayTo(mouseState.X, mouseState.Y); ray.Normalize();
grabConstraint.Anchor = Conversion.ToJitterVector(Camera.Position + (ray * hitDistance));
grabBody.IsActive = true;
if (!grabBody.IsStatic)
{
grabBody.LinearVelocity *= 0.98f;
grabBody.AngularVelocity *= 0.98f;
}
}
}
else
{
if (grabConstraint != null)
{
World.RemoveConstraint(grabConstraint);
}
grabBody = null;
grabConstraint = null;
}
if (PressedOnce(Keys.Space, Buttons.B))
{
SpawnRandomPrimitive(Conversion.ToJitterVector(Camera.Position),
Conversion.ToJitterVector((Camera.Target - Camera.Position) * 40.0f));
}
if (PressedOnce(Keys.Add, Buttons.X))
{
DestroyCurrentScene();
currentScene++;
currentScene = currentScene % PhysicScenes.Count;
PhysicScenes[currentScene].Build();
}
if (PressedOnce(Keys.Subtract, Buttons.Y))
{
DestroyCurrentScene();
currentScene += PhysicScenes.Count - 1;
currentScene = currentScene % PhysicScenes.Count;
PhysicScenes[currentScene].Build();
}
UpdateDisplayText(gameTime);
float step = (float)gameTime.ElapsedGameTime.TotalSeconds;
if (step > 1.0f / 100.0f)
{
step = 1.0f / 100.0f;
}
World.Step(step, multithread);
gamePadPreviousState = padState;
keyboardPreviousState = keyState;
mousePreviousState = mouseState;
base.Update(gameTime);
}
/// <summary>
/// Searches for physics objects to "grab" based on in input location.
/// </summary>
/// <param name="location"></param>
private void HandleGrabBody(Vector2 location)
{
Ray ray = RayTo(location);
float rayLength = 100f;
float fraction; // represents distance ray travelled before colliding
bool result = World.CollisionSystem.Raycast(toJVector(ray.Position), toJVector(ray.Direction) * rayLength, RaycastCallback, out grabBody, out hitNormal, out fraction);
if (result)
{
hitPoint = toJVector(ray.Position + fraction * (ray.Direction * rayLength));
if (grabConstraint != null)
{
World.RemoveConstraint(grabConstraint);
}
JVector lanchor = hitPoint - grabBody.Position;
lanchor = JVector.Transform(lanchor, JMatrix.Transpose(grabBody.Orientation));
grabConstraint = new SingleBodyConstraints.PointOnPoint(grabBody, lanchor);
grabConstraint.Softness = 0.01f;
grabConstraint.BiasFactor = 0.1f;
World.AddConstraint(grabConstraint);
hitDistance = (toVector3(hitPoint) - ray.Position).Length();
grabConstraint.Anchor = hitPoint;
}
}
protected override void Update(GameTime gameTime)
{
GamePadState padState = GamePad.GetState(PlayerIndex.One);
KeyboardState keyState = Keyboard.GetState();
MouseState mouseState = Mouse.GetState();
// let the user escape the demo
if (keyState.IsKeyDown(Keys.Escape) ||
padState.IsButtonDown(Buttons.Back)) this.Exit();
// change threading mode
if (keyState.IsKeyDown(Keys.M) && !keyboardPreviousState.IsKeyDown(Keys.M))
multithread = !multithread;
if (keyState.IsKeyDown(Keys.P) && !keyboardPreviousState.IsKeyDown(Keys.P))
debugDraw = !debugDraw;
#region drag and drop physical objects with the mouse
if (mouseState.LeftButton == ButtonState.Pressed &&
mousePreviousState.LeftButton == ButtonState.Released)
{
JVector ray = Conversion.ToJitterVector(RayTo(mouseState.X, mouseState.Y));
JVector camp = Conversion.ToJitterVector(Camera.Position);
ray = JVector.Normalize(ray) * 100;
float fraction;
bool result = World.CollisionSystem.Raycast(camp, ray, RaycastCallback, out grabBody, out hitNormal, out fraction);
if (result)
{
hitPoint = camp + fraction * ray;
if (grabConstraint != null) World.RemoveConstraint(grabConstraint);
JVector lanchor = hitPoint - grabBody.Position;
lanchor = JVector.Transform(lanchor, JMatrix.Transpose(grabBody.Orientation));
grabConstraint = new SingleBodyConstraints.PointOnPoint(grabBody, lanchor);
grabConstraint.Softness = 0.01f;
grabConstraint.BiasFactor = 0.1f;
World.AddConstraint(grabConstraint);
hitDistance = (Conversion.ToXNAVector(hitPoint) - Camera.Position).Length();
scrollWheel = mouseState.ScrollWheelValue;
grabConstraint.Anchor = hitPoint;
}
}
if (mouseState.LeftButton == ButtonState.Pressed)
{
hitDistance += (mouseState.ScrollWheelValue - scrollWheel) * 0.01f;
scrollWheel = mouseState.ScrollWheelValue;
if (grabBody != null)
{
Vector3 ray = RayTo(mouseState.X, mouseState.Y); ray.Normalize();
grabConstraint.Anchor = Conversion.ToJitterVector(Camera.Position + ray * hitDistance);
grabBody.IsActive = true;
if (!grabBody.IsStatic)
{
grabBody.LinearVelocity *= 0.98f;
grabBody.AngularVelocity *= 0.98f;
}
}
}
else
{
grabBody = null;
if (grabConstraint != null) World.RemoveConstraint(grabConstraint);
}
#endregion
#region create random primitives
if (keyState.IsKeyDown(Keys.Space) && !keyboardPreviousState.IsKeyDown(Keys.Space))
{
SpawnRandomPrimitive(Conversion.ToJitterVector(Camera.Position),
Conversion.ToJitterVector((Camera.Target - Camera.Position) * 40.0f));
}
#endregion
#region switch through physic scenes
if (keyState.IsKeyDown(Keys.Add) &&
!keyboardPreviousState.IsKeyDown(Keys.Add) ||
keyState.IsKeyDown(Keys.OemPlus) &&
!keyboardPreviousState.IsKeyDown(Keys.OemPlus))
{
PhysicScenes[currentScene].Destroy();
RemoveComponents();
currentScene++;
currentScene = currentScene % PhysicScenes.Count;
PhysicScenes[currentScene].Build();
}
if (keyState.IsKeyDown(Keys.OemMinus) &&
!keyboardPreviousState.IsKeyDown(Keys.OemMinus) ||
keyState.IsKeyDown(Keys.Subtract) &&
!keyboardPreviousState.IsKeyDown(Keys.Subtract))
{
PhysicScenes[currentScene].Destroy();
RemoveComponents();
currentScene += PhysicScenes.Count - 1;
currentScene = currentScene % PhysicScenes.Count;
PhysicScenes[currentScene].Build();
}
#endregion
UpdateDisplayText(gameTime);
float step = (float)gameTime.ElapsedGameTime.TotalSeconds;
if (step > 1.0f / 100.0f) step = 1.0f / 100.0f;
World.Step(step, multithread);
gamePadPreviousState = padState;
keyboardPreviousState = keyState;
mousePreviousState = mouseState;
base.Update(gameTime);
}
/// <summary>
/// Releases physics body (if applicable) on release of pointer, either mouse button up or removal of touch input
/// </summary>
/// <param name="sender"></param>
/// <param name="args"></param>
public void OnManipulationCompleted(GestureRecognizer sender, ManipulationCompletedEventArgs args)
{
if (grabConstraint != null)
{
World.RemoveConstraint(grabConstraint);
}
grabBody = null;
grabConstraint = null;
}
