diff options
| -rw-r--r-- | source/Entities/ProjectileEntity.cpp | 127 | ||||
| -rw-r--r-- | source/Entities/ProjectileEntity.h | 4 |
2 files changed, 127 insertions, 4 deletions
diff --git a/source/Entities/ProjectileEntity.cpp b/source/Entities/ProjectileEntity.cpp index 8f9f3b480..ed7803410 100644 --- a/source/Entities/ProjectileEntity.cpp +++ b/source/Entities/ProjectileEntity.cpp @@ -8,6 +8,9 @@ #include "../ClientHandle.h" #include "Player.h" #include "../LineBlockTracer.h" +#include "../BoundingBox.h" +#include "../ChunkMap.h" +#include "../Chunk.h" @@ -64,6 +67,82 @@ protected: /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +// cProjectileEntityCollisionCallback: + +class cProjectileEntityCollisionCallback : + public cEntityCallback +{ +public: + cProjectileEntityCollisionCallback(cProjectileEntity * a_Projectile, const Vector3d & a_Pos, const Vector3d & a_NextPos) : + m_Projectile(a_Projectile), + m_Pos(a_Pos), + m_NextPos(a_NextPos), + m_MinCoeff(1), + m_HitEntity(NULL) + { + } + + + virtual bool Item(cEntity * a_Entity) override + { + if (a_Entity == m_Projectile) + { + // Self-colision + return false; + } + + cBoundingBox EntBox(a_Entity->GetPosition(), a_Entity->GetWidth() / 2, a_Entity->GetHeight()); + + // Instead of colliding the bounding box with another bounding box in motion, we collide an enlarged bounding box with a hairline. + // The results should be good enough for our purposes + double LineCoeff; + char Face; + EntBox.Expand(m_Projectile->GetWidth() / 2, m_Projectile->GetHeight() / 2, m_Projectile->GetWidth() / 2); + if (!EntBox.CalcLineIntersection(m_Pos, m_NextPos, LineCoeff, Face)) + { + // No intersection whatsoever + return false; + } + + // TODO: Some entities don't interact with the projectiles (pickups, falling blocks) + // TODO: Allow plugins to interfere about which entities can be hit + + if (LineCoeff < m_MinCoeff) + { + // The entity is closer than anything we've stored so far, replace it as the potential victim + m_MinCoeff = LineCoeff; + m_HitEntity = a_Entity; + } + + // Don't break the enumeration, we want all the entities + return false; + } + + /// Returns the nearest entity that was hit, after the enumeration has been completed + cEntity * GetHitEntity(void) const { return m_HitEntity; } + + /// Returns the line coeff where the hit was encountered, after the enumeration has been completed + double GetMinCoeff(void) const { return m_MinCoeff; } + + /// Returns true if the callback has encountered a true hit + bool HasHit(void) const { return (m_MinCoeff < 1); } + +protected: + cProjectileEntity * m_Projectile; + const Vector3d & m_Pos; + const Vector3d & m_NextPos; + double m_MinCoeff; // The coefficient of the nearest hit on the Pos line + + // Although it's bad(tm) to store entity ptrs from a callback, we can afford it here, because the entire callback + // is processed inside the tick thread, so the entities won't be removed in between the calls and the final processing + cEntity * m_HitEntity; // The nearest hit entity +} ; + + + + + +/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// // cProjectileEntity: cProjectileEntity::cProjectileEntity(eKind a_Kind, cEntity * a_Creator, double a_X, double a_Y, double a_Z, double a_Width, double a_Height) : @@ -192,17 +271,39 @@ void cProjectileEntity::HandlePhysics(float a_Dt, cChunk & a_Chunk) // Trace the tick's worth of movement as a line: Vector3d NextPos = Pos + PerTickSpeed; cProjectileTracerCallback TracerCallback(this); - if (cLineBlockTracer::Trace(*m_World, TracerCallback, Pos, NextPos)) + if (!cLineBlockTracer::Trace(*m_World, TracerCallback, Pos, NextPos)) + { + // Something has been hit, abort all other processing + return; + } + + // Test for entity collisions: + cProjectileEntityCollisionCallback EntityCollisionCallback(this, Pos, NextPos); + a_Chunk.ForEachEntity(EntityCollisionCallback); + if (EntityCollisionCallback.HasHit()) { - // Nothing in the way, update the position - SetPosition(NextPos); + // An entity was hit: + // DEBUG: + Vector3d HitPos = Pos + (NextPos - Pos) * EntityCollisionCallback.GetMinCoeff(); + LOGD("Projectile %d has hit an entity %d (%s) at {%.02f, %.02f, %.02f} (coeff %.03f)", + m_UniqueID, + EntityCollisionCallback.GetHitEntity()->GetUniqueID(), + EntityCollisionCallback.GetHitEntity()->GetClass(), + HitPos.x, HitPos.y, HitPos.z, + EntityCollisionCallback.GetMinCoeff() + ); + OnHitEntity(*(EntityCollisionCallback.GetHitEntity())); } + // TODO: Test the entities in the neighboring chunks, too + + // Update the position: + SetPosition(NextPos); // Add gravity effect to the vertical speed component: SetSpeedY(GetSpeedY() + m_Gravity / 20); // DEBUG: - LOGD("Arrow %d: pos {%.02f, %.02f, %.02f}, speed {%.02f, %.02f, %.02f}", + LOGD("Projectile %d: pos {%.02f, %.02f, %.02f}, speed {%.02f, %.02f, %.02f}", m_UniqueID, GetPosX(), GetPosY(), GetPosZ(), GetSpeedX(), GetSpeedY(), GetSpeedZ() @@ -277,6 +378,24 @@ void cArrowEntity::SpawnOn(cClientHandle & a_Client) +void cArrowEntity::OnHitEntity(cEntity & a_EntityHit) +{ + if (!a_EntityHit.IsMob() && !a_EntityHit.IsMinecart() && !a_EntityHit.IsPlayer()) + { + // Not an entity that interacts with an arrow + return; + } + + // TODO: The damage dealt should be based on arrow speed in addition to the damage coeff + a_EntityHit.TakeDamage(dtRangedAttack, this, (int)(2.5 * m_DamageCoeff), 1); + + Destroy(); +} + + + + + /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// // cThrownEggEntity: diff --git a/source/Entities/ProjectileEntity.h b/source/Entities/ProjectileEntity.h index 95dc00abc..da82c82ea 100644 --- a/source/Entities/ProjectileEntity.h +++ b/source/Entities/ProjectileEntity.h @@ -50,6 +50,9 @@ public: /// Called by the physics blocktracer when the entity hits a solid block, the block's coords and the face hit is given virtual void OnHitSolidBlock(int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace); + /// Called by the physics blocktracer when the entity hits another entity + virtual void OnHitEntity(cEntity & a_EntityHit) {} + // tolua_begin /// Returns the kind of the projectile (fast class identification) @@ -140,6 +143,7 @@ protected: // cProjectileEntity overrides: virtual void SpawnOn(cClientHandle & a_Client) override; + virtual void OnHitEntity(cEntity & a_EntityHit) override; // tolua_begin } ; |