public static bool Animate( Point3D currentValue, Vector3D currentVelocity, Point3D targetValue, double attractionFator, double dampening, double terminalVelocity, double minValueDelta, double minVelocityDelta, out Point3D newValue, out Vector3D newVelocity) { Debug.Assert(currentValue.IsValid()); Debug.Assert(currentVelocity.IsValid()); Debug.Assert(targetValue.IsValid()); Debug.Assert(dampening.IsValid()); Debug.Assert(dampening > 0 && dampening < 1); Debug.Assert(attractionFator.IsValid()); Debug.Assert(attractionFator > 0); Debug.Assert(terminalVelocity > 0); Debug.Assert(minValueDelta > 0); Debug.Assert(minVelocityDelta > 0); Vector3D diff = targetValue - currentValue; if (diff.Length > minValueDelta || currentVelocity.Length > minVelocityDelta) { newVelocity = currentVelocity * (1 - dampening); newVelocity += diff * attractionFator; newVelocity *= (currentVelocity.Length > terminalVelocity) ? terminalVelocity / currentVelocity.Length : 1; newValue = currentValue + newVelocity; return true; } else { newValue = targetValue; newVelocity = new Vector3D(); return false; } }
/// <summary> /// Rotates the camera about the specified axis and center point by the specified angle in degrees. /// </summary> public void Rotate(Vector3D axis, double angle, Point3D center) { if (!center.IsValid()) center = Math3D.Origin; Position = Position.Subtract(center); Rotate(axis, angle); Position = Position.Add(center); }