public List <Vector2> CalculatePath(Vector2 lastDrawnPoint, Vector2 mousePosition)
{
path.Clear();
//Use start point of previous segment as a reference point of new segment to ensure smooth joint
previousSegmentStart = currentSegmentStart;
currentSegmentStart = CreateBezierAnchorPoint(previousSegmentStart, lastDrawnPoint);
currentSegmentEnd = CreateBezierAnchorPoint(currentSegmentStart, mousePosition);
for (float percent = 0f; percent <= 1f; percent += 0.01f)
{
Vector2 point = GetCubicBezierPoint(currentSegmentStart.position, currentSegmentStart.controlPointAfter, currentSegmentEnd.controlPointBefore, currentSegmentEnd.position, percent);
path.Add(point);
}
return(path);
}
private BezierAnchorPoint CreateBezierAnchorPoint(BezierAnchorPoint previousBezierAnchorPoint, Vector2 position)
{
BezierAnchorPoint bezierPoint = new BezierAnchorPoint();
bezierPoint.position = position;
if (previousBezierAnchorPoint == null)
{
bezierPoint.controlPointBefore = position;
bezierPoint.controlPointAfter = position;
}
else
{
//setup control points symmetrically to ensure smooth joint
bezierPoint.controlPointBefore = Vector2.Lerp(previousBezierAnchorPoint.controlPointAfter, position, 0.5f);
bezierPoint.controlPointAfter = position + (position - bezierPoint.controlPointBefore);
}
return(bezierPoint);
}
public void StartNewPath(Vector2 pathStartPosition)
{
previousSegmentStart = CreateBezierAnchorPoint(null, pathStartPosition);
currentSegmentStart = CreateBezierAnchorPoint(null, pathStartPosition);
currentSegmentEnd = CreateBezierAnchorPoint(null, pathStartPosition);
}
