/// <summary>
/// 求曲线上与给定点最近的点
/// </summary>
public float GetClosestLocation(Vector3 point, int segments)
{
Vector3 last = _f0;
Vector3 current;
float closest01;
float sqrMagnitude;
float bestSqrMagnitude = float.MaxValue;
float bestT = 0f;
for (int i = 1; i <= segments; i++)
{
current = GetPoint((float)i / segments);
closest01 = MathKit.ClosestPointOnSegmentFactor(point, last, current);
sqrMagnitude = (last + (current - last) * closest01 - point).sqrMagnitude;
if (sqrMagnitude < bestSqrMagnitude)
{
bestSqrMagnitude = sqrMagnitude;
bestT = (i - 1f + closest01) / segments;
}
last = current;
}
return bestT;
}
protected override void OnMoveToolSceneGUI(T path)
{
if (_showTension)
{
for (int i = 0; i < path.segmentCount; i++)
{
float tension = path.GetSegmentTension(i);
var point1 = path.GetNodePosition(i);
var point2 = path.GetNodePosition((i + 1) % path.nodeCount);
point1 = point1 * 0.75f + point2 * 0.25f;
point2 = point1 / 3f + point2 * (2f / 3f);
var point = (point2 - point1) * tension + point1;
Handles.color = new Color(1f, 1f, 1f, 0.5f);
HandlesKit.DrawAALine(point1, point2, 4);
float capSize = HandleUtility.GetHandleSize(point) * FloatingWindow.capSize;
using (var scope = new ChangeCheckScope(path))
{
Handles.color = capNormalColor;
point = Handles.FreeMoveHandle(point, Quaternion.identity, capSize, snap, Handles.CircleHandleCap);
tension = MathKit.ClosestPointOnSegmentFactor(point, point1, point2);
//tension = (float)Math.Round(tension, 2);
//using (new HandlesGUIScope(0))
//{
// var pos2D = HandleUtility.WorldToGUIPoint(point);
// var rect = new Rect(pos2D.x + 12, pos2D.y - 9, 32, 18);
// EditorGUI.DrawRect(rect, new Color(0, 0, 0, 0.5f));
// using (new GUIContentColorScope(Color.white))
// {
// EditorGUI.LabelField(rect, tension.ToString(), EditorStyles.whiteLabel);
// }
//}
if (scope.changed)
{
path.SetSegmentTension(i, tension);
}
}
}
}
int count = path.nodeCount;
for (int i = 0; i < count; i++)
{
var position = path.GetNodePosition(i);
float capSize = HandleUtility.GetHandleSize(position) * FloatingWindow.capSize;
if (selectedNode == i)
{
using (var scope = new ChangeCheckScope(path))
{
Handles.color = capSelectedColor;
if (selectedTool == 0)
{
position = Handles.FreeMoveHandle(position, Quaternion.identity, capSize * 2, snap, Handles.RectangleHandleCap);
}
else
{
position = Handles.PositionHandle(position, path.transform.rotation);
}
if (scope.changed)
{
path.SetNodePosition(i, position);
}
}
}
else
{
Handles.color = capNormalColor;
if (Handles.Button(position, Quaternion.identity, capSize, capSize, Handles.DotHandleCap))
{
selectedNode = i;
}
}
}
}
