public static void MirrorTangent(this IEditablePath path, int index)
{
var localToWorldMatrix = path.localToWorldMatrix;
path.localToWorldMatrix = Matrix4x4.identity;
var controlPoint = path.GetPoint(index);
if (controlPoint.tangentMode == TangentMode.Linear)
{
return;
}
if (!Mathf.Approximately((controlPoint.localLeftTangent + controlPoint.localRightTangent).sqrMagnitude, 0f))
{
if (controlPoint.mirrorLeft)
{
controlPoint.localLeftTangent = -controlPoint.localRightTangent;
}
else
{
controlPoint.localRightTangent = -controlPoint.localLeftTangent;
}
controlPoint.StoreTangents();
path.SetPoint(index, controlPoint);
}
path.localToWorldMatrix = localToWorldMatrix;
}
public static void UpdateTangentMode(this IEditablePath path, int index)
{
var localToWorldMatrix = path.localToWorldMatrix;
path.localToWorldMatrix = Matrix4x4.identity;
var controlPoint = path.GetPoint(index);
var isLeftTangentLinear = controlPoint.localLeftTangent == Vector3.zero;
var isRightTangentLinear = controlPoint.localRightTangent == Vector3.zero;
if (isLeftTangentLinear && isRightTangentLinear)
{
controlPoint.tangentMode = TangentMode.Linear;
}
else if (isLeftTangentLinear || isRightTangentLinear)
{
controlPoint.tangentMode = TangentMode.Broken;
}
else if (controlPoint.tangentMode != TangentMode.Continuous)
{
controlPoint.tangentMode = TangentMode.Broken;
}
controlPoint.StoreTangents();
path.SetPoint(index, controlPoint);
path.localToWorldMatrix = localToWorldMatrix;
}
public static void UpdateTangentsFromMode(this IEditablePath path)
{
const float kEpsilon = 0.001f;
var localToWorldMatrix = path.localToWorldMatrix;
path.localToWorldMatrix = Matrix4x4.identity;
for (var i = 0; i < path.pointCount; ++i)
{
var controlPoint = path.GetPoint(i);
if (controlPoint.tangentMode == TangentMode.Linear)
{
controlPoint.localLeftTangent = Vector3.zero;
controlPoint.localRightTangent = Vector3.zero;
}
else if (controlPoint.tangentMode == TangentMode.Broken)
{
var isLeftEndpoint = path.isOpenEnded && i == 0;
var prevPoint = path.GetPrevPoint(i);
var nextPoint = path.GetNextPoint(i);
var liniarLeftPosition = (prevPoint.position - controlPoint.position) / 3f;
var isLeftTangentLinear = isLeftEndpoint || (controlPoint.localLeftTangent - liniarLeftPosition).sqrMagnitude < kEpsilon;
if (isLeftTangentLinear)
{
controlPoint.localLeftTangent = Vector3.zero;
}
var isRightEndpoint = path.isOpenEnded && i == path.pointCount - 1;
var liniarRightPosition = (nextPoint.position - controlPoint.position) / 3f;
var isRightTangentLinear = isRightEndpoint || (controlPoint.localRightTangent - liniarRightPosition).sqrMagnitude < kEpsilon;
if (isRightTangentLinear)
{
controlPoint.localRightTangent = Vector3.zero;
}
if (isLeftTangentLinear && isRightTangentLinear)
{
controlPoint.tangentMode = TangentMode.Linear;
}
}
else if (controlPoint.tangentMode == TangentMode.Continuous)
{
//TODO: ensure tangent continuity
}
controlPoint.StoreTangents();
path.SetPoint(i, controlPoint);
}
path.localToWorldMatrix = localToWorldMatrix;
}
public static void SetTangentMode(this IEditablePath path, int index, TangentMode tangentMode)
{
var localToWorldMatrix = path.localToWorldMatrix;
path.localToWorldMatrix = Matrix4x4.identity;
var controlPoint = path.GetPoint(index);
var isEndpoint = path.isOpenEnded && (index == 0 || index == path.pointCount - 1);
var oldTangentMode = controlPoint.tangentMode;
controlPoint.tangentMode = tangentMode;
controlPoint.RestoreTangents();
if (tangentMode == TangentMode.Linear)
{
controlPoint.localLeftTangent = Vector3.zero;
controlPoint.localRightTangent = Vector3.zero;
}
else if (tangentMode == TangentMode.Continuous && !isEndpoint)
{
var isLeftLinear = controlPoint.localLeftTangent == Vector3.zero;
var isRightLinear = controlPoint.localRightTangent == Vector3.zero;
var tangentDotProduct = Vector3.Dot(controlPoint.localLeftTangent.normalized, controlPoint.localRightTangent.normalized);
var isContinous = tangentDotProduct < 0f && (tangentDotProduct + 1) < 0.001f;
var isLinear = isLeftLinear && isRightLinear;
if ((isLinear || oldTangentMode == TangentMode.Broken) && !isContinous)
{
var prevPoint = path.GetPrevPoint(index);
var nextPoint = path.GetNextPoint(index);
var vLeft = prevPoint.position - controlPoint.position;
var vRight = nextPoint.position - controlPoint.position;
var rightDirection = Vector3.Cross(Vector3.Cross(vLeft, vRight), vLeft.normalized + vRight.normalized).normalized;
var scale = 1f / 3f;
if (isLeftLinear)
{
controlPoint.localLeftTangent = vLeft.magnitude * scale * -rightDirection;
}
else
{
controlPoint.localLeftTangent = controlPoint.localLeftTangent.magnitude * -rightDirection;
}
if (isRightLinear)
{
controlPoint.localRightTangent = vRight.magnitude * scale * rightDirection;
}
else
{
controlPoint.localRightTangent = controlPoint.localRightTangent.magnitude * rightDirection;
}
}
}
else
{
var isLeftLinear = controlPoint.localLeftTangent == Vector3.zero;
var isRightLinear = controlPoint.localRightTangent == Vector3.zero;
if (isLeftLinear || isRightLinear)
{
if (isLeftLinear)
{
controlPoint.localLeftTangent = path.CalculateLocalLeftTangent(index);
}
if (isRightLinear)
{
controlPoint.localRightTangent = path.CalculateLocalRightTangent(index);
}
}
}
controlPoint.StoreTangents();
path.SetPoint(index, controlPoint);
path.localToWorldMatrix = localToWorldMatrix;
}
