} // end of SmoothCamera Update()
#endregion
#region Internal
/// <summary>
/// Translates the current eyeOffset to the proper From/At values.
/// </summary>
private void TranslateOffset(float blend)
{
if (CameraInfo.FirstPersonActive)
{
// In first person mode we want to put the camera in the desiredAt
// position and set its facing direction based on the rotation.
// Use a lerp here to smooth the transition from follow
// mode to first person mode.
float t = Math.Min(10.0f * Time.GameTimeFrameSeconds, 1.0f);
base.From = MyMath.Lerp(base.From, desiredAt, t);
float sinRot = (float)Math.Sin(rotation);
float cosRot = (float)Math.Cos(rotation);
float sinPitch = (float)Math.Sin(firstPersonPitch);
float cosPitch = (float)Math.Cos(firstPersonPitch);
base.At = base.From + new Vector3(cosRot * cosPitch, sinRot * cosPitch, sinPitch);
t *= 0.8f * InGame.CameraSpringStrength;
firstPersonPitch = MyMath.Lerp(firstPersonPitch, firstPersonDesiredPitch, t);
firstPersonDesiredPitch = MyMath.Lerp(firstPersonDesiredPitch, 0.0f, firstPersonPitchSpring * t);
}
else
{
base.At = MyMath.Lerp(base.At, desiredAt, blend);
base.From = base.At + eyeOffset;
}
} // end of TranslateOffset()
} // end of Camera MoveHeightOffset()
/// <summary>
/// A helper function which smoothly changes the heightOffset of the camera.
/// </summary>
/// <param name="height">The height we want the camera at point to be.</param>
public void ChangeHeightOffset(float height)
{
float desiredOffset = height - At.Z;
// Be sure this doesn't go negative.
desiredOffset = Math.Max(0.0f, desiredOffset);
targetHeight = height;
HeightOffset = MyMath.Lerp(HeightOffset, desiredOffset, Time.WallClockFrameSeconds);
} // end of Camera MoveHeightOffset()
public override void Update()
{
bumped = false;
// Calc blend value for lerping.
// Use wall clock time so this works even if the game is paused.
float secs = Time.WallClockFrameSeconds;
float blend = 5.0f * Time.WallClockFrameSeconds;
if (GamePadInput.ActiveMode == GamePadInput.InputMode.Touch)
{
//faster interpolation in touch mode
blend = 10.0f * Time.WallClockFrameSeconds;
}
// Soften up the camera movement if tracking multiple targets.
if (CameraInfo.Mode == CameraInfo.Modes.MultiTarget)
{
blend *= 0.2f;
}
blend = Math.Min(blend, 1.0f);
// Blend the eyeOffset toward the desired value.
eyeOffset = MyMath.Lerp(eyeOffset, desiredEyeOffset, blend);
TranslateOffset(blend);
// Check if the camera needs to be moved to avoid the terrain.
InGame.inGame.shared.KeepCameraAboveGround();
// If we hit the terrain, update the From and At values again.
if (bumped)
{
TranslateOffset(blend);
}
// Update real and desired angles for use this frame.
UpdateValues();
base.Update();
pitchChanged = false;
} // end of SmoothCamera Update()
public override Matrix Lerp(Matrix a, Matrix b, float t)
{
return(MyMath.Lerp(ref a, ref b, t));
}
public override Vector4 Lerp(Vector4 a, Vector4 b, float t)
{
return(MyMath.Lerp(a, b, t));
}
public override float Lerp(float a, float b, float t)
{
return(MyMath.Lerp(a, b, t));
}
} // end of c'tor
// Cut and pasted from BaseSpriteEmitter, just to override
// how the position is computed. Might like to refactor the
// Update into common particle tasks (spawn, kill, move, etc.)
public override void Update(Camera camera)
{
if (Active)
{
// Emit new particles if needed.
float dt = Time.GameTimeFrameSeconds;
dt = MathHelper.Clamp(dt, 0.0f, 1.0f); // Limit to reasonable values.
Position += Velocity * dt;
if (Emitting)
{
if (LinearEmission)
{
Vector3 deltaPosition = Position - PreviousPosition;
float dist = deltaPosition.Length();
partial += dist * EmissionRate;
}
else
{
partial += dt * EmissionRate;
}
// Emit as many particles as needed this
// frame to keep up with the emission rate.
while (partial >= 1.0f)
{
if (particleList.Count < MaxSprites)
{
// Pick a random position on the sphere.
Vector3 rndVec = new Vector3((float)(rnd.NextDouble() - rnd.NextDouble()),
(float)(rnd.NextDouble() - rnd.NextDouble()),
(float)(rnd.NextDouble() - rnd.NextDouble()));
rndVec.Normalize();
rndVec *= targetRadius;
Vector3 pos = Position + rndVec;
// Pick a random position somewhere along the path covered this frame.
if (PositionJitter > 0.0f)
{
pos += PositionJitter * new Vector3((float)rnd.NextDouble() - (float)rnd.NextDouble(), (float)rnd.NextDouble() - (float)rnd.NextDouble(), (float)rnd.NextDouble() - (float)rnd.NextDouble());
}
float lifetime = MinLifetime + (float)rnd.NextDouble() * (MaxLifetime - MinLifetime);
BaseSpriteParticle particle = new BaseSpriteParticle(pos, lifetime, Color, MaxRotationRate, NumTiles);
particleList.Add(particle);
}
partial -= 1.0f;
}
}
// Update the previous position to match the current one for the next frame.
ResetPreviousPosition();
// Update any existing particles. For more heavyweight particles we could
// have an Update call per particle. These are lightweight enough that we
// can just update them directly.
for (int i = 0; i < particleList.Count;)
{
BaseSpriteParticle particle = (BaseSpriteParticle)particleList[i];
particle.age += dt;
Debug.Assert(particle.age >= 0.0f);
float t = particle.age / particle.lifetime;
if (t > 1.0f)
{
// Dead particle.
particleList.RemoveAt(i);
}
else
{
particle.radius = MyMath.Lerp(StartRadius, EndRadius, t);
particle.alpha = MyMath.Lerp(StartAlpha, EndAlpha, t);
particle.rotation += particle.deltaRotation * dt;
// Change the linear fade to a curve.
particle.alpha *= particle.alpha;
// Add in gravity effect.
if (NonZeroGravity)
{
particle.velocity += Gravity * dt;
float speed2 = particle.velocity.LengthSquared();
if (speed2 > MaxSpeed * MaxSpeed)
{
particle.velocity.Normalize();
particle.velocity *= MaxSpeed;
}
}
particle.position += particle.velocity * dt;
i++;
}
} // end loop update particles.
// Now that we've updated all the particles, create/update the vertex buffer.
UpdateVerts();
// See if we've died.
if (Dying && particleList.Count == 0)
{
Active = false;
RemoveFromManager();
}
} // end of if active
} // end Update
} // end of PixelsToCameraSpaceScreenCoords()
/// <summary>
/// A helper function which smoothly changes the heightOffset of the camera.
/// This takes the desired offset as a paramter, rather than the absolute height.
/// </summary>
/// <param name="height">The height we want the camera at point to be.</param>
public void ChangeHeightOffsetNotHeight(float desiredOffset)
{
targetHeight = Terrain.GetTerrainHeightFlat(At) + desiredOffset;
HeightOffset = MyMath.Lerp(HeightOffset, desiredOffset, Time.WallClockFrameSeconds);
} // end of Camera MoveHeightOffset()
} // end of TwitchCurve c'tor
/// <summary>
/// Applies the curve to the paramter t. Assumes that t is
/// in the range [0, 1].
/// </summary>
public static float Apply(float t, Shape shape)
{
const float overshootAmplitutde = 0.1f;
float result = t;
switch (shape)
{
case Shape.Linear:
result = t;
break;
case Shape.EaseIn:
result = 2.0f * MyMath.SmoothStep(0.0f, 2.0f, t);
break;
case Shape.EaseOut:
result = 2.0f * MyMath.SmoothStep(-1.0f, 1.0f, t) - 1.0f;
break;
case Shape.EaseInOut:
result = MyMath.SmoothStep(0.0f, 1.0f, t);
break;
case Shape.OvershootIn:
{
t *= 0.5f;
float smooth = MyMath.SmoothStep(0.0f, 1.0f, t);
result = smooth - overshootAmplitutde * (float)Math.Cos((t - 0.25f) * MathHelper.TwoPi);
// Blend toward smooth at tail.
if (t < 0.1f)
{
result = MyMath.Lerp(smooth, result, t * 10.0f);
}
result *= 2.0f;
}
break;
case Shape.OvershootOut:
{
t = 0.5f + t * 0.5f;
float smooth = MyMath.SmoothStep(0.0f, 1.0f, t);
result = smooth - overshootAmplitutde * (float)Math.Cos((t - 0.25f) * MathHelper.TwoPi);
// Blend toward smooth at tail.
if (t > 0.9f)
{
result = MyMath.Lerp(smooth, result, (1.0f - t) * 10.0f);
}
result = (result - 0.5f) * 2.0f;
}
break;
case Shape.OvershootInOut:
{
float smooth = MyMath.SmoothStep(0.0f, 1.0f, t);
result = smooth - overshootAmplitutde * (float)Math.Cos((t - 0.25f) * MathHelper.TwoPi);
// Blend toward smooth at tails.
if (t < 0.1f)
{
result = MyMath.Lerp(smooth, result, t * 10.0f);
}
else if (t > 0.9f)
{
result = MyMath.Lerp(smooth, result, (1.0f - t) * 10.0f);
}
}
break;
}
return(result);
} // TwitchCurve Apply()
