/// <summary>
/// Construct & display the curve from DragPointsHandler control points
/// Find the curve traveller position along the curve
/// </summary>
///
/// <remarks>
/// Will use the DragPointExposure from the handler's item to display slingshot segments accordingly
/// Will update handler's curve traveller position and control point base index for point insertion
/// </remarks>
private void DisplayCurve()
{
List <Vector3>[] controlPointsSegments = new List <Vector3> [_handler.ControlPoints.Count].Select(item => new List <Vector3>()).ToArray();
// Display Curve & handle curve traveller
if (_handler.ControlPoints.Count > 1)
{
var transformedDPoints = new List <DragPointData>();
foreach (var controlPoint in _handler.ControlPoints)
{
var newDp = new DragPointData(controlPoint.DragPoint)
{
Center = controlPoint.WorldPos.ToVertex3D()
};
transformedDPoints.Add(newDp);
}
var vAccuracy = Vector3.one;
vAccuracy = _handler.Transform.localToWorldMatrix.MultiplyVector(vAccuracy);
var accuracy = Mathf.Abs(vAccuracy.x * vAccuracy.y * vAccuracy.z);
accuracy *= HandleUtility.GetHandleSize(_handler.CurveTravellerPosition) * ControlPoint.ScreenRadius;
var vVertex = DragPoint.GetRgVertex <RenderVertex3D, CatmullCurve3DCatmullCurveFactory>(
transformedDPoints.ToArray(), _handler.DragPointEditable.PointsAreLooping(), accuracy
);
if (vVertex.Length > 0)
{
// Fill Control points paths
ControlPoint currentControlPoint = null;
foreach (var v in vVertex)
{
if (v.IsControlPoint)
{
if (currentControlPoint != null)
{
controlPointsSegments[currentControlPoint.Index].Add(v.ToUnityVector3());
}
currentControlPoint = _handler.ControlPoints.Find(cp => cp.WorldPos == v.ToUnityVector3());
}
if (currentControlPoint != null)
{
controlPointsSegments[currentControlPoint.Index].Add(v.ToUnityVector3());
}
}
// close loop if needed
if (_handler.DragPointEditable.PointsAreLooping())
{
controlPointsSegments[_handler.ControlPoints.Count - 1].Add(controlPointsSegments[0][0]);
}
// construct full path
_pathPoints.Clear();
const float splitRatio = 0.1f;
foreach (var controlPoint in _handler.ControlPoints)
{
// Split straight segments to avoid HandleUtility.ClosestPointToPolyLine issues
ref var segments = ref controlPointsSegments[controlPoint.Index];
if (segments.Count == 2)
{
var dir = segments[1] - segments[0];
var dist = dir.magnitude;
dir = Vector3.Normalize(dir);
var newPath = new List <Vector3> {
segments[0]
};
for (var splitDist = dist * splitRatio; splitDist < dist; splitDist += dist * splitRatio)
{
newPath.Add(newPath[0] + dir * splitDist);
}
newPath.Add(segments[1]);
segments = newPath;
}
_pathPoints.AddRange(segments);
}
_curveTravellerMoved = false;
if (_pathPoints.Count > 1)
{
var newPos = HandleUtility.ClosestPointToPolyLine(_pathPoints.ToArray());
if ((newPos - _handler.CurveTravellerPosition).magnitude >= HandleUtility.GetHandleSize(_handler.CurveTravellerPosition) * ControlPoint.ScreenRadius * CurveTravellerSizeRatio * 0.1f)
{
_handler.CurveTravellerPosition = newPos;
_curveTravellerMoved = true;
}
}
// Render Curve with correct color regarding drag point properties & find curve section where the curve traveller is
_handler.CurveTravellerControlPointIdx = -1;
var minDist = float.MaxValue;
foreach (var controlPoint in _handler.ControlPoints)
{
var segments = controlPointsSegments[controlPoint.Index].ToArray();
if (segments.Length > 1)
{
Handles.color = _handler.DragPointEditable.GetDragPointExposition().Contains(DragPointExposure.SlingShot) && controlPoint.DragPoint.IsSlingshot ? CurveSlingShotColor : CurveColor;
Handles.DrawAAPolyLine(CurveWidth, segments);
var closestToPath = HandleUtility.ClosestPointToPolyLine(segments);
var dist = (closestToPath - _handler.CurveTravellerPosition).magnitude;
if (dist < minDist)
{
minDist = dist;
_handler.CurveTravellerControlPointIdx = controlPoint.Index;
}
}
}
}
}