/// <summary>
/// Draws a <seealso cref="Rigidbody2D" />'s trajectory using <seealso cref="Debug" />.DrawLine.
/// </summary>
/// <param name="rb"> The body whose trajectory is being drawn. </param>
/// <param name="force"> For predicting the effects of a Rigidbody2D.AddForce() method. Use Vector2.zero if not needed. </param>
/// <param name="mode"> Determines how the force vector changes the velocity. Irrelevant when using Vector2.zero. </param>
/// <param name="color"> The color of the line being drawn. </param>
/// <param name="trajectoryDuration"> Amount of time in seconds to predict. </param>
/// <param name="lineDuration"> Amount of time in seconds the drawn line will persist. </param>
/// <param name="constantForce"> Will the force be applied every FixedUpdate. </param>
/// <param name='depthTest'> Whether or not the line should be faded when behind other objects. </param>
public static void DebugTrajectory(this Rigidbody2D rb, Vector2 force, ForceMode2D mode, Color color,
float trajectoryDuration = 1.0f, float lineDuration = 0.0f, bool constantForce = false, bool depthTest = false)
{
var positions = rb.GetTrajectory(force, mode, trajectoryDuration, constantForce);
for (var i = 0; i < positions.Length - 1; i++)
{
Debug.DrawLine(positions[i], positions[i + 1], color, lineDuration, depthTest);
}
}
/// <summary>
/// Draws a <seealso cref="Rigidbody2D" />'s trajectory using <seealso cref="Gizmos" />.DrawLine.
/// </summary>
/// <param name="rb"> The body whose trajectory is being drawn. </param>
/// <param name="force"> For predicting the effects of a Rigidbody2D.AddForce() method. Use Vector2.zero if not needed. </param>
/// <param name="mode"> Determines how the force vector changes the velocity. Irrelevant when using Vector2.zero. </param>
/// <param name="color"> The color of the line being drawn. </param>
/// <param name="trajectoryDuration"> Amount of time in seconds to predict. </param>
/// <param name="constantForce"> Will the force be applied every FixedUpdate. </param>
public static void DrawTrajectory(this Rigidbody2D rb, Vector2 force, ForceMode2D mode, Color color,
float trajectoryDuration = 1.0f, bool constantForce = false)
{
var oldColor = Gizmos.color;
Gizmos.color = color;
var positions = rb.GetTrajectory(force, mode, trajectoryDuration, constantForce);
for (var i = 0; i < positions.Length - 1; i++)
{
Gizmos.DrawLine(positions[i], positions[i + 1]);
}
Gizmos.color = oldColor;
}
/// <summary>
/// Calculates a <seealso cref="Rigidbody2D" />'s trajectory and returns it as an array of position vectors.
/// </summary>
/// <param name="rb"> The body whose trajectory is being drawn. </param>
/// <param name="force"> For predicting the effects of a Rigidbody2D.AddForce() method. Use Vector2.zero if not needed. </param>
/// <param name="mode"> Determines how the force vector changes the velocity. Irrelevant when using Vector2.zero. </param>
/// <param name="trajectoryDuration"> Amount of time in seconds to predict. </param>
/// <param name="constantForce"> Will the force be applied every FixedUpdate. </param>
/// <returns>
/// An array of the body's expected positions after each FixedUpdate in the trajectory. The last index being the
/// final position.
/// </returns>
public static Vector2[] GetTrajectory(this Rigidbody2D rb, Vector2 force, ForceMode2D mode,
float trajectoryDuration = 1.0f, bool constantForce = false)
{
Vector2[] velocities;
return(rb.GetTrajectory(force, mode, out velocities, trajectoryDuration, constantForce));
}