private Vector3 ClosestPointInEdge(IGUIState guiState, Vector2 mousePosition, int index)
{
if (GetShapeType() == ShapeType.Polygon)
{
var p0 = GetPoint(index).position;
var p1 = NextControlPoint(index).position;
var mouseWorldPosition = GUIToWorld(guiState, mousePosition);
var dir1 = (mouseWorldPosition - p0);
var dir2 = (p1 - p0);
return(Mathf.Clamp01(Vector3.Dot(dir1, dir2.normalized) / dir2.magnitude) * dir2 + p0);
}
else if (GetShapeType() == ShapeType.Spline)
{
var nextIndex = NextIndex(index);
float t;
return(BezierUtility.ClosestPointOnCurve(
GUIToWorld(guiState, mousePosition),
GetPoint(index).position,
GetPoint(nextIndex).position,
GetRightTangent(index),
GetLeftTangent(nextIndex),
out t));
}
return(Vector3.zero);
}
public void CreatePoint(int index, Vector3 position)
{
ClearSelection();
if (editablePath.shapeType == ShapeType.Polygon)
{
editablePath.InsertPoint(index + 1, new ControlPoint()
{
position = position
});
}
else if (editablePath.shapeType == ShapeType.Spline)
{
var nextIndex = NextIndex(index);
var currentPoint = editablePath.GetPoint(index);
var nextPoint = editablePath.GetPoint(nextIndex);
float t;
var closestPoint = BezierUtility.ClosestPointOnCurve(
position,
currentPoint.position,
nextPoint.position,
GetRightTangentPosition(index),
GetLeftTangentPosition(nextIndex),
out t);
Vector3 leftStartPosition;
Vector3 leftEndPosition;
Vector3 leftStartTangent;
Vector3 leftEndTangent;
Vector3 rightStartPosition;
Vector3 rightEndPosition;
Vector3 rightStartTangent;
Vector3 rightEndTangent;
BezierUtility.SplitBezier(t, currentPoint.position, nextPoint.position, GetRightTangentPosition(index), GetLeftTangentPosition(nextIndex),
out leftStartPosition, out leftEndPosition, out leftStartTangent, out leftEndTangent,
out rightStartPosition, out rightEndPosition, out rightStartTangent, out rightEndTangent);
var newPointIndex = index + 1;
var newPoint = new ControlPoint()
{
position = closestPoint,
leftTangent = leftEndTangent,
rightTangent = rightStartTangent,
tangentMode = TangentMode.Continuous
};
currentPoint.rightTangent = leftStartTangent;
nextPoint.leftTangent = rightEndTangent;
if (currentPoint.tangentMode == TangentMode.Linear && nextPoint.tangentMode == TangentMode.Linear)
{
newPoint.tangentMode = TangentMode.Linear;
newPoint.localLeftTangent = Vector3.zero;
newPoint.localRightTangent = Vector3.zero;
currentPoint.localRightTangent = Vector3.zero;
nextPoint.localLeftTangent = Vector3.zero;
}
else
{
if (currentPoint.tangentMode == TangentMode.Linear)
{
currentPoint.tangentMode = TangentMode.Broken;
}
if (nextPoint.tangentMode == TangentMode.Linear)
{
nextPoint.tangentMode = TangentMode.Broken;
}
}
editablePath.SetPoint(index, currentPoint);
editablePath.SetPoint(nextIndex, nextPoint);
editablePath.InsertPoint(newPointIndex, newPoint);
}
}