private void UpdateSpreadAnim()
{
curTime += Time.deltaTime;
if (curTime > totalTime)
{
isSpreadAnim = false;
}
float t = Mathf.Clamp01(curTime / totalTime);
for (int i = 0; i < animChilds.Count; i++)
{
AnimChild child = animChilds[i];
float angle = child.rotAngle * t;
child.transform.Rotate(child.rotAxis, angle - child.lastAngle, Space.World);
child.lastAngle = angle;
Vector3 posVec = Vector3.Slerp(child.startPosVec, child.endPosVec, t);
child.transform.position = midPos + posVec;
}
}
private void StartSpreadAnim(bool normalToSpread, float speed)
{
totalTime = speed;
curTime = 0;
circleForward = track.Circles[0].forward;
Vector3 tangent, up;
float distance;
track.Curve.Build(track.Circles, track.CurveType);
track.Curve.GetBottomMidSample(out midPos, out tangent, out up, out distance);
float halfLength = 0.5f * track.Curve.Length;
//计算起点偏移，使中点为midPos
track.StartOffset = distance - halfLength;
if (normalToSpread)
{
//从收拢到平铺
SetKeyframe((int)TrackState.Normal);
track.IsSpread = true;
}
else
{
//从平铺到收拢
SetKeyframe((int)TrackState.Spread);
track.IsSpread = false;
}
int midIndex = Mathf.FloorToInt(halfLength / track.Spacing);
List <TrackChildInfo> endTransInfos = track.ComputeTrack();
animChilds.Clear();
for (int i = 0; i < track.transform.childCount; i++)
{
Transform child = track.transform.GetChild(i);
AnimChild animChild = new AnimChild();
animChilds.Add(animChild);
animChild.transform = child;
animChild.startPosVec = child.position - midPos;
animChild.endPosVec = endTransInfos[i].position - midPos;
animChild.startTangent = child.rotation * Vector3.left;
animChild.endTangent = endTransInfos[i].rotation * Vector3.left;
animChild.rotAngle = Mathf.Rad2Deg * Mathf.Acos(Mathf.Clamp(Vector3.Dot(animChild.startTangent, animChild.endTangent), -1, 1));
//修正旋转动画角度
Vector3 cross = Vector3.Cross(animChild.startTangent, animChild.endTangent);
if (i <= midIndex)
{
animChild.rotAxis = circleForward;
}
else
{
animChild.rotAxis = -circleForward;
}
if (Vector3.Dot(cross, animChild.rotAxis) < -0.0001f)
{
animChild.rotAngle = 360 - animChild.rotAngle;
}
}
if (!track.IsSpread)
{
//反过来转
for (int i = 0; i < animChilds.Count; i++)
{
if (animChilds[i].rotAngle > 0.001f)
{
animChilds[i].rotAxis = -animChilds[i].rotAxis;
animChilds[i].rotAngle = 360 - animChilds[i].rotAngle;
}
}
}
isSpreadAnim = true;
}
