public void Update()
{
lastPos = pos;
//更新绳子物理
if (rope != null)
{
rope.Update(tentacleIndex != 0 ? tentacle.tChunks[tentacleIndex - 1].pos : tentacle.FloatBase, pos);
if (!RopeActive || phase > -1.0 || tentacleIndex > 0 && tentacle.tChunks[tentacleIndex - 1].phase > -1.0 || rope.totalLength > tentacle.idealLength / (double)tentacle.tChunks.Length * 5.0)
{
rope.Reset();
}
}
//如果当前Chunk已定相
if (phase == -1.0)
{
if (phasesToSameLocation > 0 && tentacle.segments[this.currentSegment] == afterPhaseStuckPos)
{
pos = Utils.RestrictInRect(pos, StuckRect);
}
//如果是第一个触手节（靠近基座）
if (tentacleIndex == 0)
{
//计算距离基座的方向和距离
Vector2 dir = Utils.DirVec(pos, tentacle.FloatBase);
float dist = Vector2.Distance(pos, tentacle.FloatBase);
if (RopeActive)
{
dir = Utils.DirVec(pos, rope.BConnect);
dist = rope.totalLength;
}
//计算收缩长度 =（理想长度 * 撤回因子）/ 触手关节数目
float length = tentacle.idealLength / tentacle.tChunks.Length * Mathf.Lerp(1f, 0.1f, tentacle.retractFac);
if (tp.stiff || dist > (double)length)
{
//更新当前Chunk的Pos、Vel属性
pos -= dir * (length - dist) * (1f - tp.pullAtConnectionChunk);
vel -= dir * (length - dist) * (1f - tp.pullAtConnectionChunk);
//如果触手属性对生物连接体有拉力：更新连接Chunk的Pos、Vel属性
if (tentacle.connectedChunk != null && tp.pullAtConnectionChunk > 0.0)
{
if (RopeActive)
{
dir = Utils.DirVec(rope.AConnect, tentacle.connectedChunk.pos);
}
tentacle.connectedChunk.pos += dir * (length - dist) * tp.pullAtConnectionChunk;
tentacle.connectedChunk.vel += dir * (length - dist) * tp.pullAtConnectionChunk;
}
}
//计算当前拉伸系数 = 理想长度 /（ 触手关节数 * 与上一关节距离）
stretchedFac = tentacle.idealLength / tentacle.tChunks.Length / Mathf.Max(1f, dist);
}
//（计算逻辑基本同上）
else
{
//计算与前一触手节的方向和距离
Vector2 dir = Utils.DirVec(pos, tentacle.tChunks[tentacleIndex - 1].pos);
float dist = Vector2.Distance(pos, tentacle.tChunks[tentacleIndex - 1].pos);
if (RopeActive)
{
dir = Utils.DirVec(pos, rope.BConnect);
dist = rope.totalLength;
}
float num = tentacle.idealLength / tentacle.tChunks.Length * Mathf.Lerp(1f, 0.1f, tentacle.retractFac);
if (tp.stiff || dist > (double)num)
{
pos -= dir * (num - dist) * (1f - tp.massDeteriorationPerChunk);
vel -= dir * (num - dist) * (1f - tp.massDeteriorationPerChunk);
if (RopeActive)
{
dir = Utils.DirVec(rope.AConnect, tentacle.tChunks[tentacleIndex - 1].pos);
}
tentacle.tChunks[tentacleIndex - 1].pos += dir * (num - dist) * tp.massDeteriorationPerChunk;
tentacle.tChunks[tentacleIndex - 1].vel += dir * (num - dist) * tp.massDeteriorationPerChunk;
}
stretchedFac = tentacle.idealLength / tentacle.tChunks.Length / Mathf.Max(1f, dist);
}
//StuckPos不等于trail首个位置时，trail首位插入StuckPos
if (StuckPos != currentSegmentTrail[0])
{
currentSegmentTrail.Insert(0, StuckPos);
currentSegmentTrail.RemoveAt(currentSegmentTrail.Count - 1);
}
//检测撤回关节索引不存在 && 当前Chunk位置和Segment直线不可达
if (tentacle.backtrackFrom == -1 && !tentacle.Visual(tentacle.room.GetTilePosition(pos), tentacle.segments[this.currentSegment]))
{
tentacle.backtrackFrom = tentacleIndex;
}
//如果当前触手体存在撤回索引，且当前Chunk索引大于撤回索引
if (tentacle.backtrackFrom != -1 && tentacleIndex >= tentacle.backtrackFrom)
{
bool flag = false;
for (int index = 1; index <= currentSegment && !flag; ++index)
{
if (!PhysicsUtils.RayTraceTilesForTerrain(tentacle.room, tentacle.room.GetTilePosition(pos), tentacle.segments[index]) &&
PhysicsUtils.RayTraceTilesForTerrain(tentacle.room, tentacle.room.GetTilePosition(pos), tentacle.segments[index - 1]))
{
vel += Vector2.ClampMagnitude(tentacle.room.MiddleOfTile(tentacle.segments[index - 1]) - pos, 20f) * tp.backtrackSpeed / 20f;
flag = true;
}
}
if (!flag)
{
//获取前一触手节位置
Vector2 tentacleBase = tentacle.FloatBase;
if (tentacleIndex > 0)
{
tentacleBase = tentacle.tChunks[tentacleIndex - 1].pos;
}
//更新当前Chunk速度 =（ 矢量距离 * 撤回速度）/ 20f
vel += Vector2.ClampMagnitude(tentacleBase - pos, 20f) * tp.backtrackSpeed / 20f;
//更新前一Chunk速度
if (tentacleIndex > 0)
{
tentacle.tChunks[tentacleIndex - 1].vel += Vector2.ClampMagnitude(tentacleBase - pos, 20f) * tp.backtrackSpeed / 20f;
}
}
//当前关联Point不为空
if (!flag && (contactPoint.x != 0 || contactPoint.y != 0))
{
//定相尝试次数递增1
++phaseAttempts;
//定相尝试次数 > 触手属性值
if (phaseAttempts > tentacle.tProps.terrainHitsBeforePhase)
{
//开始定相
PhaseToSegment();
phaseAttempts = 0;
}
}
}
//不存在撤回索引 or 撤回索引大于当前Chunk索引
else
{
phaseAttempts = 0;
//瘫软状态
if (tentacle.limp)
{
//从当前Seg往前遍历
for (int currentSegment = this.currentSegment; currentSegment >= 0; --currentSegment)
{
//如果当前Chunk位置和Seg视觉可见
if (tentacle.Visual(tentacle.room.GetTilePosition(pos), tentacle.segments[currentSegment]))
{
if (tentacle.room.GetTile(tentacle.segments[currentSegment].x, tentacle.segments[currentSegment].y - 1).Solid)
{
vel += Vector2.ClampMagnitude(tentacle.room.MiddleOfTile(tentacle.segments[currentSegment].x, tentacle.segments[currentSegment].y) - pos, 20f) * 0.005f;
break;
}
vel += Vector2.ClampMagnitude(tentacle.room.MiddleOfTile(tentacle.segments[currentSegment]) - pos, 20f) * 0.005f;
break;
}
}
}
//触手非瘫软状态
else
{
//触手存在抓取目标
if (tentacle.floatGrabDest.HasValue)
{
//计算抓取目标对Chunk的吸引力 ： 修改速度
if (tentacleIndex == tentacle.tChunks.Length - 1)
{
vel += Vector2.ClampMagnitude(tentacle.floatGrabDest.Value - pos, 20f) * tp.goalAttractionSpeedTip / 20f;
}
else
{
vel += Vector2.ClampMagnitude(tentacle.floatGrabDest.Value - pos, 20f) * tp.goalAttractionSpeed / 20f;
}
}
//Chunk速度 对齐Segment
vel += Vector2.ClampMagnitude(tentacle.room.MiddleOfTile(tentacle.segments[currentSegment]) - pos, 20f) * tp.alignToSegmentSpeed / 20f;
}
}
//Clamp速度、更新位置
vel = Vector2.ClampMagnitude(vel, tp.chunkVelocityCap);
pos += vel;
//与地形发生碰撞、计算碰撞后的位置、速度、碰撞点
if (collideWithTerrain)
{
lastContactPoint = contactPoint;
PhysicsUtils.TerrainCollisionData terrainCollisionData = PhysicsUtils.HorizontalCollision(tentacle.room, PhysicsUtils.SlopesVertically(tentacle.room, PhysicsUtils.VerticalCollision(tentacle.room, new PhysicsUtils.TerrainCollisionData(pos, pos - vel, vel, rad, new IntVector2(0, 0), true))));
contactPoint = terrainCollisionData.contactPoint;
pos = terrainCollisionData.pos;
vel = terrainCollisionData.vel;
}
}
//如果当前Chunk为定相
else
{
//定相逐帧计数（后面的数值基本都设置为：15）
phase += 1f / tp.segmentPhaseThroughTerrainFrames;
//根据当前定相进度，插值改变Pos属性（PhaseFrom->StuckPos）
if (phase <= 1.0)
{
pos = Vector2.Lerp(phaseFrom, tentacle.room.MiddleOfTile(StuckPos), Mathf.Min(1f, phase));
}
//速度设置为0
vel *= 0.0f;
//定相完成
if (phase >= 1.0)
{
phase = -1f;
if (afterPhaseStuckPos == StuckPos)
{
++phasesToSameLocation;
}
else
{
phasesToSameLocation = 0;
}
afterPhaseStuckPos = StuckPos;
}
//如果是触手关节、且前一触手节未定相
if (tentacleIndex > 0 && tentacle.tChunks[tentacleIndex - 1].phase == -1.0)
{
//计算与前一触手节的方向和距离
Vector2 dir = Utils.DirVec(pos, tentacle.tChunks[tentacleIndex - 1].pos);
float dist = Vector2.Distance(pos, tentacle.tChunks[tentacleIndex - 1].pos);
//计算收缩长度 =（理想长度 * 撤回因子）/ 触手关节数目
float length = tentacle.idealLength / tentacle.tChunks.Length * Mathf.Lerp(1f, 0.1f, tentacle.retractFac);
if (tp.stiff || dist > (double)length)
{
//对前一触手节产生影响
tentacle.tChunks[tentacleIndex - 1].pos += dir * (length - dist) * tp.massDeteriorationPerChunk;
tentacle.tChunks[tentacleIndex - 1].vel += dir * (length - dist) * tp.massDeteriorationPerChunk;
}
//计算拉伸系数
stretchedFac = length / dist;
}
}
UpdateDebugSprites();
}