/// <summary>
/// Update player transform to follow the path
/// </summary>
/// <param name="gameTime">The current game time</param>
protected override void Update(TimeSpan gameTime)
{
// Gets the current frame specified by the screenplay manager.
int frame = (int)this.screenplay.CurrentFrameTime;
if (frame < this.objectPath.Start)
{
// If the frame is earlier than the path start, return...
this.Owner.IsVisible = false;
return;
}
if (frame >= this.objectPath.End - 1)
{
// If the frame is greather than the path end, return...
this.Owner.IsVisible = false;
return;
}
if (!this.Owner.IsVisible)
{
this.Owner.IsVisible = true;
}
int startFrame = (frame - this.objectPath.Start) % this.objectPath.Duration;
int endFrame = (startFrame + 1) % this.objectPath.Duration;
float lerp = (float)(this.screenplay.CurrentFrameTime - frame);
ObjectFrame startPoint = this.objectPath.Frames[startFrame];
ObjectFrame endPoint = this.objectPath.Frames[endFrame];
// Update entity trasnform using the current path frame
this.transform.Position = Vector3.Lerp(startPoint.Position, endPoint.Position, lerp);
this.transform.Orientation = Quaternion.Lerp(startPoint.Rotation, endPoint.Rotation, lerp);
}
/// <summary>
/// Instantiate a object path specified by a file
/// </summary>
/// <param name="objectPath">The object path filepath</param>
/// <param name="offsetRotation">Orientation offset</param>
public ObjectPath(string objectPath, Quaternion offsetRotation)
{
using (var stream = WaveServices.Storage.OpenContentFile(objectPath))
{
var streamReader = new StreamReader(stream);
string line = streamReader.ReadLine();
var lineParts = line.Split(' ');
this.Start = int.Parse(lineParts[0]);
this.End = int.Parse(lineParts[1]);
this.Steps = int.Parse(lineParts[2]);
this.Duration = this.End - this.Start;
this.Frames = new ObjectFrame[this.Duration];
Vector3 axis;
float angle;
for (int i = 0; i < this.Duration; i++)
{
line = streamReader.ReadLine();
lineParts = line.Split(' ');
Vector3 position = new Vector3(
float.Parse(lineParts[0], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(lineParts[1], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(lineParts[2], System.Globalization.CultureInfo.InvariantCulture));
Quaternion rotation = new Quaternion(
float.Parse(lineParts[3], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(lineParts[4], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(lineParts[5], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(lineParts[6], System.Globalization.CultureInfo.InvariantCulture));
Quaternion.ToAngleAxis(ref rotation, out axis, out angle);
float temp = axis.Z;
axis.Z = -axis.Y;
axis.Y = -temp;
Quaternion fixedRotation;
Quaternion.CreateFromAxisAngle(ref axis, angle, out fixedRotation);
fixedRotation = Quaternion.CreateFromAxisAngle(Vector3.UnitY, MathHelper.Pi) * fixedRotation * offsetRotation;
ObjectFrame point = new ObjectFrame()
{
Position = position,
Rotation = fixedRotation
};
this.Frames[i] = point;
}
}
}
/// <summary>
/// Instantiate a object path specified by a file
/// </summary>
/// <param name="objectPath">The object path filepath</param>
/// <param name="offsetRotation">Orientation offset</param>
public ObjectPath(string objectPath, Quaternion offsetRotation)
{
using (var stream = WaveServices.Storage.OpenContentFile(objectPath))
{
var streamReader = new StreamReader(stream);
string line = streamReader.ReadLine();
var lineParts = line.Split(' ');
this.Start = int.Parse(lineParts[0]);
this.End = int.Parse(lineParts[1]);
this.Steps = int.Parse(lineParts[2]);
this.Duration = this.End - this.Start;
this.Frames = new ObjectFrame[this.Duration];
Vector3 axis;
float angle;
for (int i = 0; i < this.Duration; i++)
{
line = streamReader.ReadLine();
lineParts = line.Split(' ');
Vector3 position = new Vector3(
float.Parse(lineParts[0], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(lineParts[1], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(lineParts[2], System.Globalization.CultureInfo.InvariantCulture));
Quaternion rotation = new Quaternion(
float.Parse(lineParts[3], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(lineParts[4], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(lineParts[5], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(lineParts[6], System.Globalization.CultureInfo.InvariantCulture));
Quaternion.ToAngleAxis(ref rotation, out axis, out angle);
float temp = axis.Z;
axis.Z = -axis.Y;
axis.Y = -temp;
Quaternion fixedRotation;
Quaternion.CreateFromAxisAngle(ref axis, angle, out fixedRotation);
fixedRotation = Quaternion.CreateFromAxisAngle(Vector3.UnitY, MathHelper.Pi) * fixedRotation * offsetRotation;
ObjectFrame point = new ObjectFrame()
{
Position = position,
Rotation = fixedRotation
};
this.Frames[i] = point;
}
}
}
