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Diffstat (limited to 'src/p_map.c')
| -rw-r--r-- | src/p_map.c | 1342 |
1 files changed, 1342 insertions, 0 deletions
diff --git a/src/p_map.c b/src/p_map.c new file mode 100644 index 00000000..4b437ab1 --- /dev/null +++ b/src/p_map.c @@ -0,0 +1,1342 @@ +// Emacs style mode select -*- C++ -*- +//----------------------------------------------------------------------------- +// +// $Id: p_map.c 4 2005-07-23 16:19:41Z fraggle $ +// +// Copyright (C) 1993-1996 by id Software, Inc. +// +// This source is available for distribution and/or modification +// only under the terms of the DOOM Source Code License as +// published by id Software. All rights reserved. +// +// The source is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License +// for more details. +// +// $Log$ +// Revision 1.1 2005/07/23 16:20:39 fraggle +// Initial revision +// +// +// DESCRIPTION: +// Movement, collision handling. +// Shooting and aiming. +// +//----------------------------------------------------------------------------- + +static const char +rcsid[] = "$Id: p_map.c 4 2005-07-23 16:19:41Z fraggle $"; + +#include <stdlib.h> + +#include "m_bbox.h" +#include "m_random.h" +#include "i_system.h" + +#include "doomdef.h" +#include "p_local.h" + +#include "s_sound.h" + +// State. +#include "doomstat.h" +#include "r_state.h" +// Data. +#include "sounds.h" + + +fixed_t tmbbox[4]; +mobj_t* tmthing; +int tmflags; +fixed_t tmx; +fixed_t tmy; + + +// If "floatok" true, move would be ok +// if within "tmfloorz - tmceilingz". +boolean floatok; + +fixed_t tmfloorz; +fixed_t tmceilingz; +fixed_t tmdropoffz; + +// keep track of the line that lowers the ceiling, +// so missiles don't explode against sky hack walls +line_t* ceilingline; + +// keep track of special lines as they are hit, +// but don't process them until the move is proven valid +#define MAXSPECIALCROSS 8 + +line_t* spechit[MAXSPECIALCROSS]; +int numspechit; + + + +// +// TELEPORT MOVE +// + +// +// PIT_StompThing +// +boolean PIT_StompThing (mobj_t* thing) +{ + fixed_t blockdist; + + if (!(thing->flags & MF_SHOOTABLE) ) + return true; + + blockdist = thing->radius + tmthing->radius; + + if ( abs(thing->x - tmx) >= blockdist + || abs(thing->y - tmy) >= blockdist ) + { + // didn't hit it + return true; + } + + // don't clip against self + if (thing == tmthing) + return true; + + // monsters don't stomp things except on boss level + if ( !tmthing->player && gamemap != 30) + return false; + + P_DamageMobj (thing, tmthing, tmthing, 10000); + + return true; +} + + +// +// P_TeleportMove +// +boolean +P_TeleportMove +( mobj_t* thing, + fixed_t x, + fixed_t y ) +{ + int xl; + int xh; + int yl; + int yh; + int bx; + int by; + + subsector_t* newsubsec; + + // kill anything occupying the position + tmthing = thing; + tmflags = thing->flags; + + tmx = x; + tmy = y; + + tmbbox[BOXTOP] = y + tmthing->radius; + tmbbox[BOXBOTTOM] = y - tmthing->radius; + tmbbox[BOXRIGHT] = x + tmthing->radius; + tmbbox[BOXLEFT] = x - tmthing->radius; + + newsubsec = R_PointInSubsector (x,y); + ceilingline = NULL; + + // The base floor/ceiling is from the subsector + // that contains the point. + // Any contacted lines the step closer together + // will adjust them. + tmfloorz = tmdropoffz = newsubsec->sector->floorheight; + tmceilingz = newsubsec->sector->ceilingheight; + + validcount++; + numspechit = 0; + + // stomp on any things contacted + xl = (tmbbox[BOXLEFT] - bmaporgx - MAXRADIUS)>>MAPBLOCKSHIFT; + xh = (tmbbox[BOXRIGHT] - bmaporgx + MAXRADIUS)>>MAPBLOCKSHIFT; + yl = (tmbbox[BOXBOTTOM] - bmaporgy - MAXRADIUS)>>MAPBLOCKSHIFT; + yh = (tmbbox[BOXTOP] - bmaporgy + MAXRADIUS)>>MAPBLOCKSHIFT; + + for (bx=xl ; bx<=xh ; bx++) + for (by=yl ; by<=yh ; by++) + if (!P_BlockThingsIterator(bx,by,PIT_StompThing)) + return false; + + // the move is ok, + // so link the thing into its new position + P_UnsetThingPosition (thing); + + thing->floorz = tmfloorz; + thing->ceilingz = tmceilingz; + thing->x = x; + thing->y = y; + + P_SetThingPosition (thing); + + return true; +} + + +// +// MOVEMENT ITERATOR FUNCTIONS +// + + +// +// PIT_CheckLine +// Adjusts tmfloorz and tmceilingz as lines are contacted +// +boolean PIT_CheckLine (line_t* ld) +{ + if (tmbbox[BOXRIGHT] <= ld->bbox[BOXLEFT] + || tmbbox[BOXLEFT] >= ld->bbox[BOXRIGHT] + || tmbbox[BOXTOP] <= ld->bbox[BOXBOTTOM] + || tmbbox[BOXBOTTOM] >= ld->bbox[BOXTOP] ) + return true; + + if (P_BoxOnLineSide (tmbbox, ld) != -1) + return true; + + // A line has been hit + + // The moving thing's destination position will cross + // the given line. + // If this should not be allowed, return false. + // If the line is special, keep track of it + // to process later if the move is proven ok. + // NOTE: specials are NOT sorted by order, + // so two special lines that are only 8 pixels apart + // could be crossed in either order. + + if (!ld->backsector) + return false; // one sided line + + if (!(tmthing->flags & MF_MISSILE) ) + { + if ( ld->flags & ML_BLOCKING ) + return false; // explicitly blocking everything + + if ( !tmthing->player && ld->flags & ML_BLOCKMONSTERS ) + return false; // block monsters only + } + + // set openrange, opentop, openbottom + P_LineOpening (ld); + + // adjust floor / ceiling heights + if (opentop < tmceilingz) + { + tmceilingz = opentop; + ceilingline = ld; + } + + if (openbottom > tmfloorz) + tmfloorz = openbottom; + + if (lowfloor < tmdropoffz) + tmdropoffz = lowfloor; + + // if contacted a special line, add it to the list + if (ld->special) + { + spechit[numspechit] = ld; + numspechit++; + } + + return true; +} + +// +// PIT_CheckThing +// +boolean PIT_CheckThing (mobj_t* thing) +{ + fixed_t blockdist; + boolean solid; + int damage; + + if (!(thing->flags & (MF_SOLID|MF_SPECIAL|MF_SHOOTABLE) )) + return true; + + blockdist = thing->radius + tmthing->radius; + + if ( abs(thing->x - tmx) >= blockdist + || abs(thing->y - tmy) >= blockdist ) + { + // didn't hit it + return true; + } + + // don't clip against self + if (thing == tmthing) + return true; + + // check for skulls slamming into things + if (tmthing->flags & MF_SKULLFLY) + { + damage = ((P_Random()%8)+1)*tmthing->info->damage; + + P_DamageMobj (thing, tmthing, tmthing, damage); + + tmthing->flags &= ~MF_SKULLFLY; + tmthing->momx = tmthing->momy = tmthing->momz = 0; + + P_SetMobjState (tmthing, tmthing->info->spawnstate); + + return false; // stop moving + } + + + // missiles can hit other things + if (tmthing->flags & MF_MISSILE) + { + // see if it went over / under + if (tmthing->z > thing->z + thing->height) + return true; // overhead + if (tmthing->z+tmthing->height < thing->z) + return true; // underneath + + if (tmthing->target && ( + tmthing->target->type == thing->type || + (tmthing->target->type == MT_KNIGHT && thing->type == MT_BRUISER)|| + (tmthing->target->type == MT_BRUISER && thing->type == MT_KNIGHT) ) ) + { + // Don't hit same species as originator. + if (thing == tmthing->target) + return true; + + if (thing->type != MT_PLAYER) + { + // Explode, but do no damage. + // Let players missile other players. + return false; + } + } + + if (! (thing->flags & MF_SHOOTABLE) ) + { + // didn't do any damage + return !(thing->flags & MF_SOLID); + } + + // damage / explode + damage = ((P_Random()%8)+1)*tmthing->info->damage; + P_DamageMobj (thing, tmthing, tmthing->target, damage); + + // don't traverse any more + return false; + } + + // check for special pickup + if (thing->flags & MF_SPECIAL) + { + solid = thing->flags&MF_SOLID; + if (tmflags&MF_PICKUP) + { + // can remove thing + P_TouchSpecialThing (thing, tmthing); + } + return !solid; + } + + return !(thing->flags & MF_SOLID); +} + + +// +// MOVEMENT CLIPPING +// + +// +// P_CheckPosition +// This is purely informative, nothing is modified +// (except things picked up). +// +// in: +// a mobj_t (can be valid or invalid) +// a position to be checked +// (doesn't need to be related to the mobj_t->x,y) +// +// during: +// special things are touched if MF_PICKUP +// early out on solid lines? +// +// out: +// newsubsec +// floorz +// ceilingz +// tmdropoffz +// the lowest point contacted +// (monsters won't move to a dropoff) +// speciallines[] +// numspeciallines +// +boolean +P_CheckPosition +( mobj_t* thing, + fixed_t x, + fixed_t y ) +{ + int xl; + int xh; + int yl; + int yh; + int bx; + int by; + subsector_t* newsubsec; + + tmthing = thing; + tmflags = thing->flags; + + tmx = x; + tmy = y; + + tmbbox[BOXTOP] = y + tmthing->radius; + tmbbox[BOXBOTTOM] = y - tmthing->radius; + tmbbox[BOXRIGHT] = x + tmthing->radius; + tmbbox[BOXLEFT] = x - tmthing->radius; + + newsubsec = R_PointInSubsector (x,y); + ceilingline = NULL; + + // The base floor / ceiling is from the subsector + // that contains the point. + // Any contacted lines the step closer together + // will adjust them. + tmfloorz = tmdropoffz = newsubsec->sector->floorheight; + tmceilingz = newsubsec->sector->ceilingheight; + + validcount++; + numspechit = 0; + + if ( tmflags & MF_NOCLIP ) + return true; + + // Check things first, possibly picking things up. + // The bounding box is extended by MAXRADIUS + // because mobj_ts are grouped into mapblocks + // based on their origin point, and can overlap + // into adjacent blocks by up to MAXRADIUS units. + xl = (tmbbox[BOXLEFT] - bmaporgx - MAXRADIUS)>>MAPBLOCKSHIFT; + xh = (tmbbox[BOXRIGHT] - bmaporgx + MAXRADIUS)>>MAPBLOCKSHIFT; + yl = (tmbbox[BOXBOTTOM] - bmaporgy - MAXRADIUS)>>MAPBLOCKSHIFT; + yh = (tmbbox[BOXTOP] - bmaporgy + MAXRADIUS)>>MAPBLOCKSHIFT; + + for (bx=xl ; bx<=xh ; bx++) + for (by=yl ; by<=yh ; by++) + if (!P_BlockThingsIterator(bx,by,PIT_CheckThing)) + return false; + + // check lines + xl = (tmbbox[BOXLEFT] - bmaporgx)>>MAPBLOCKSHIFT; + xh = (tmbbox[BOXRIGHT] - bmaporgx)>>MAPBLOCKSHIFT; + yl = (tmbbox[BOXBOTTOM] - bmaporgy)>>MAPBLOCKSHIFT; + yh = (tmbbox[BOXTOP] - bmaporgy)>>MAPBLOCKSHIFT; + + for (bx=xl ; bx<=xh ; bx++) + for (by=yl ; by<=yh ; by++) + if (!P_BlockLinesIterator (bx,by,PIT_CheckLine)) + return false; + + return true; +} + + +// +// P_TryMove +// Attempt to move to a new position, +// crossing special lines unless MF_TELEPORT is set. +// +boolean +P_TryMove +( mobj_t* thing, + fixed_t x, + fixed_t y ) +{ + fixed_t oldx; + fixed_t oldy; + int side; + int oldside; + line_t* ld; + + floatok = false; + if (!P_CheckPosition (thing, x, y)) + return false; // solid wall or thing + + if ( !(thing->flags & MF_NOCLIP) ) + { + if (tmceilingz - tmfloorz < thing->height) + return false; // doesn't fit + + floatok = true; + + if ( !(thing->flags&MF_TELEPORT) + &&tmceilingz - thing->z < thing->height) + return false; // mobj must lower itself to fit + + if ( !(thing->flags&MF_TELEPORT) + && tmfloorz - thing->z > 24*FRACUNIT ) + return false; // too big a step up + + if ( !(thing->flags&(MF_DROPOFF|MF_FLOAT)) + && tmfloorz - tmdropoffz > 24*FRACUNIT ) + return false; // don't stand over a dropoff + } + + // the move is ok, + // so link the thing into its new position + P_UnsetThingPosition (thing); + + oldx = thing->x; + oldy = thing->y; + thing->floorz = tmfloorz; + thing->ceilingz = tmceilingz; + thing->x = x; + thing->y = y; + + P_SetThingPosition (thing); + + // if any special lines were hit, do the effect + if (! (thing->flags&(MF_TELEPORT|MF_NOCLIP)) ) + { + while (numspechit--) + { + // see if the line was crossed + ld = spechit[numspechit]; + side = P_PointOnLineSide (thing->x, thing->y, ld); + oldside = P_PointOnLineSide (oldx, oldy, ld); + if (side != oldside) + { + if (ld->special) + P_CrossSpecialLine (ld-lines, oldside, thing); + } + } + } + + return true; +} + + +// +// P_ThingHeightClip +// Takes a valid thing and adjusts the thing->floorz, +// thing->ceilingz, and possibly thing->z. +// This is called for all nearby monsters +// whenever a sector changes height. +// If the thing doesn't fit, +// the z will be set to the lowest value +// and false will be returned. +// +boolean P_ThingHeightClip (mobj_t* thing) +{ + boolean onfloor; + + onfloor = (thing->z == thing->floorz); + + P_CheckPosition (thing, thing->x, thing->y); + // what about stranding a monster partially off an edge? + + thing->floorz = tmfloorz; + thing->ceilingz = tmceilingz; + + if (onfloor) + { + // walking monsters rise and fall with the floor + thing->z = thing->floorz; + } + else + { + // don't adjust a floating monster unless forced to + if (thing->z+thing->height > thing->ceilingz) + thing->z = thing->ceilingz - thing->height; + } + + if (thing->ceilingz - thing->floorz < thing->height) + return false; + + return true; +} + + + +// +// SLIDE MOVE +// Allows the player to slide along any angled walls. +// +fixed_t bestslidefrac; +fixed_t secondslidefrac; + +line_t* bestslideline; +line_t* secondslideline; + +mobj_t* slidemo; + +fixed_t tmxmove; +fixed_t tmymove; + + + +// +// P_HitSlideLine +// Adjusts the xmove / ymove +// so that the next move will slide along the wall. +// +void P_HitSlideLine (line_t* ld) +{ + int side; + + angle_t lineangle; + angle_t moveangle; + angle_t deltaangle; + + fixed_t movelen; + fixed_t newlen; + + + if (ld->slopetype == ST_HORIZONTAL) + { + tmymove = 0; + return; + } + + if (ld->slopetype == ST_VERTICAL) + { + tmxmove = 0; + return; + } + + side = P_PointOnLineSide (slidemo->x, slidemo->y, ld); + + lineangle = R_PointToAngle2 (0,0, ld->dx, ld->dy); + + if (side == 1) + lineangle += ANG180; + + moveangle = R_PointToAngle2 (0,0, tmxmove, tmymove); + deltaangle = moveangle-lineangle; + + if (deltaangle > ANG180) + deltaangle += ANG180; + // I_Error ("SlideLine: ang>ANG180"); + + lineangle >>= ANGLETOFINESHIFT; + deltaangle >>= ANGLETOFINESHIFT; + + movelen = P_AproxDistance (tmxmove, tmymove); + newlen = FixedMul (movelen, finecosine[deltaangle]); + + tmxmove = FixedMul (newlen, finecosine[lineangle]); + tmymove = FixedMul (newlen, finesine[lineangle]); +} + + +// +// PTR_SlideTraverse +// +boolean PTR_SlideTraverse (intercept_t* in) +{ + line_t* li; + + if (!in->isaline) + I_Error ("PTR_SlideTraverse: not a line?"); + + li = in->d.line; + + if ( ! (li->flags & ML_TWOSIDED) ) + { + if (P_PointOnLineSide (slidemo->x, slidemo->y, li)) + { + // don't hit the back side + return true; + } + goto isblocking; + } + + // set openrange, opentop, openbottom + P_LineOpening (li); + + if (openrange < slidemo->height) + goto isblocking; // doesn't fit + + if (opentop - slidemo->z < slidemo->height) + goto isblocking; // mobj is too high + + if (openbottom - slidemo->z > 24*FRACUNIT ) + goto isblocking; // too big a step up + + // this line doesn't block movement + return true; + + // the line does block movement, + // see if it is closer than best so far + isblocking: + if (in->frac < bestslidefrac) + { + secondslidefrac = bestslidefrac; + secondslideline = bestslideline; + bestslidefrac = in->frac; + bestslideline = li; + } + + return false; // stop +} + + + +// +// P_SlideMove +// The momx / momy move is bad, so try to slide +// along a wall. +// Find the first line hit, move flush to it, +// and slide along it +// +// This is a kludgy mess. +// +void P_SlideMove (mobj_t* mo) +{ + fixed_t leadx; + fixed_t leady; + fixed_t trailx; + fixed_t traily; + fixed_t newx; + fixed_t newy; + int hitcount; + + slidemo = mo; + hitcount = 0; + + retry: + if (++hitcount == 3) + goto stairstep; // don't loop forever + + + // trace along the three leading corners + if (mo->momx > 0) + { + leadx = mo->x + mo->radius; + trailx = mo->x - mo->radius; + } + else + { + leadx = mo->x - mo->radius; + trailx = mo->x + mo->radius; + } + + if (mo->momy > 0) + { + leady = mo->y + mo->radius; + traily = mo->y - mo->radius; + } + else + { + leady = mo->y - mo->radius; + traily = mo->y + mo->radius; + } + + bestslidefrac = FRACUNIT+1; + + P_PathTraverse ( leadx, leady, leadx+mo->momx, leady+mo->momy, + PT_ADDLINES, PTR_SlideTraverse ); + P_PathTraverse ( trailx, leady, trailx+mo->momx, leady+mo->momy, + PT_ADDLINES, PTR_SlideTraverse ); + P_PathTraverse ( leadx, traily, leadx+mo->momx, traily+mo->momy, + PT_ADDLINES, PTR_SlideTraverse ); + + // move up to the wall + if (bestslidefrac == FRACUNIT+1) + { + // the move most have hit the middle, so stairstep + stairstep: + if (!P_TryMove (mo, mo->x, mo->y + mo->momy)) + P_TryMove (mo, mo->x + mo->momx, mo->y); + return; + } + + // fudge a bit to make sure it doesn't hit + bestslidefrac -= 0x800; + if (bestslidefrac > 0) + { + newx = FixedMul (mo->momx, bestslidefrac); + newy = FixedMul (mo->momy, bestslidefrac); + + if (!P_TryMove (mo, mo->x+newx, mo->y+newy)) + goto stairstep; + } + + // Now continue along the wall. + // First calculate remainder. + bestslidefrac = FRACUNIT-(bestslidefrac+0x800); + + if (bestslidefrac > FRACUNIT) + bestslidefrac = FRACUNIT; + + if (bestslidefrac <= 0) + return; + + tmxmove = FixedMul (mo->momx, bestslidefrac); + tmymove = FixedMul (mo->momy, bestslidefrac); + + P_HitSlideLine (bestslideline); // clip the moves + + mo->momx = tmxmove; + mo->momy = tmymove; + + if (!P_TryMove (mo, mo->x+tmxmove, mo->y+tmymove)) + { + goto retry; + } +} + + +// +// P_LineAttack +// +mobj_t* linetarget; // who got hit (or NULL) +mobj_t* shootthing; + +// Height if not aiming up or down +// ???: use slope for monsters? +fixed_t shootz; + +int la_damage; +fixed_t attackrange; + +fixed_t aimslope; + +// slopes to top and bottom of target +extern fixed_t topslope; +extern fixed_t bottomslope; + + +// +// PTR_AimTraverse +// Sets linetaget and aimslope when a target is aimed at. +// +boolean +PTR_AimTraverse (intercept_t* in) +{ + line_t* li; + mobj_t* th; + fixed_t slope; + fixed_t thingtopslope; + fixed_t thingbottomslope; + fixed_t dist; + + if (in->isaline) + { + li = in->d.line; + + if ( !(li->flags & ML_TWOSIDED) ) + return false; // stop + + // Crosses a two sided line. + // A two sided line will restrict + // the possible target ranges. + P_LineOpening (li); + + if (openbottom >= opentop) + return false; // stop + + dist = FixedMul (attackrange, in->frac); + + if (li->frontsector->floorheight != li->backsector->floorheight) + { + slope = FixedDiv (openbottom - shootz , dist); + if (slope > bottomslope) + bottomslope = slope; + } + + if (li->frontsector->ceilingheight != li->backsector->ceilingheight) + { + slope = FixedDiv (opentop - shootz , dist); + if (slope < topslope) + topslope = slope; + } + + if (topslope <= bottomslope) + return false; // stop + + return true; // shot continues + } + + // shoot a thing + th = in->d.thing; + if (th == shootthing) + return true; // can't shoot self + + if (!(th->flags&MF_SHOOTABLE)) + return true; // corpse or something + + // check angles to see if the thing can be aimed at + dist = FixedMul (attackrange, in->frac); + thingtopslope = FixedDiv (th->z+th->height - shootz , dist); + + if (thingtopslope < bottomslope) + return true; // shot over the thing + + thingbottomslope = FixedDiv (th->z - shootz, dist); + + if (thingbottomslope > topslope) + return true; // shot under the thing + + // this thing can be hit! + if (thingtopslope > topslope) + thingtopslope = topslope; + + if (thingbottomslope < bottomslope) + thingbottomslope = bottomslope; + + aimslope = (thingtopslope+thingbottomslope)/2; + linetarget = th; + + return false; // don't go any farther +} + + +// +// PTR_ShootTraverse +// +boolean PTR_ShootTraverse (intercept_t* in) +{ + fixed_t x; + fixed_t y; + fixed_t z; + fixed_t frac; + + line_t* li; + + mobj_t* th; + + fixed_t slope; + fixed_t dist; + fixed_t thingtopslope; + fixed_t thingbottomslope; + + if (in->isaline) + { + li = in->d.line; + + if (li->special) + P_ShootSpecialLine (shootthing, li); + + if ( !(li->flags & ML_TWOSIDED) ) + goto hitline; + + // crosses a two sided line + P_LineOpening (li); + + dist = FixedMul (attackrange, in->frac); + + if (li->frontsector->floorheight != li->backsector->floorheight) + { + slope = FixedDiv (openbottom - shootz , dist); + if (slope > aimslope) + goto hitline; + } + + if (li->frontsector->ceilingheight != li->backsector->ceilingheight) + { + slope = FixedDiv (opentop - shootz , dist); + if (slope < aimslope) + goto hitline; + } + + // shot continues + return true; + + + // hit line + hitline: + // position a bit closer + frac = in->frac - FixedDiv (4*FRACUNIT,attackrange); + x = trace.x + FixedMul (trace.dx, frac); + y = trace.y + FixedMul (trace.dy, frac); + z = shootz + FixedMul (aimslope, FixedMul(frac, attackrange)); + + if (li->frontsector->ceilingpic == skyflatnum) + { + // don't shoot the sky! + if (z > li->frontsector->ceilingheight) + return false; + + // it's a sky hack wall + if (li->backsector && li->backsector->ceilingpic == skyflatnum) + return false; + } + + // Spawn bullet puffs. + P_SpawnPuff (x,y,z); + + // don't go any farther + return false; + } + + // shoot a thing + th = in->d.thing; + if (th == shootthing) + return true; // can't shoot self + + if (!(th->flags&MF_SHOOTABLE)) + return true; // corpse or something + + // check angles to see if the thing can be aimed at + dist = FixedMul (attackrange, in->frac); + thingtopslope = FixedDiv (th->z+th->height - shootz , dist); + + if (thingtopslope < aimslope) + return true; // shot over the thing + + thingbottomslope = FixedDiv (th->z - shootz, dist); + + if (thingbottomslope > aimslope) + return true; // shot under the thing + + + // hit thing + // position a bit closer + frac = in->frac - FixedDiv (10*FRACUNIT,attackrange); + + x = trace.x + FixedMul (trace.dx, frac); + y = trace.y + FixedMul (trace.dy, frac); + z = shootz + FixedMul (aimslope, FixedMul(frac, attackrange)); + + // Spawn bullet puffs or blod spots, + // depending on target type. + if (in->d.thing->flags & MF_NOBLOOD) + P_SpawnPuff (x,y,z); + else + P_SpawnBlood (x,y,z, la_damage); + + if (la_damage) + P_DamageMobj (th, shootthing, shootthing, la_damage); + + // don't go any farther + return false; + +} + + +// +// P_AimLineAttack +// +fixed_t +P_AimLineAttack +( mobj_t* t1, + angle_t angle, + fixed_t distance ) +{ + fixed_t x2; + fixed_t y2; + + angle >>= ANGLETOFINESHIFT; + shootthing = t1; + + x2 = t1->x + (distance>>FRACBITS)*finecosine[angle]; + y2 = t1->y + (distance>>FRACBITS)*finesine[angle]; + shootz = t1->z + (t1->height>>1) + 8*FRACUNIT; + + // can't shoot outside view angles + topslope = 100*FRACUNIT/160; + bottomslope = -100*FRACUNIT/160; + + attackrange = distance; + linetarget = NULL; + + P_PathTraverse ( t1->x, t1->y, + x2, y2, + PT_ADDLINES|PT_ADDTHINGS, + PTR_AimTraverse ); + + if (linetarget) + return aimslope; + + return 0; +} + + +// +// P_LineAttack +// If damage == 0, it is just a test trace +// that will leave linetarget set. +// +void +P_LineAttack +( mobj_t* t1, + angle_t angle, + fixed_t distance, + fixed_t slope, + int damage ) +{ + fixed_t x2; + fixed_t y2; + + angle >>= ANGLETOFINESHIFT; + shootthing = t1; + la_damage = damage; + x2 = t1->x + (distance>>FRACBITS)*finecosine[angle]; + y2 = t1->y + (distance>>FRACBITS)*finesine[angle]; + shootz = t1->z + (t1->height>>1) + 8*FRACUNIT; + attackrange = distance; + aimslope = slope; + + P_PathTraverse ( t1->x, t1->y, + x2, y2, + PT_ADDLINES|PT_ADDTHINGS, + PTR_ShootTraverse ); +} + + + +// +// USE LINES +// +mobj_t* usething; + +boolean PTR_UseTraverse (intercept_t* in) +{ + int side; + + if (!in->d.line->special) + { + P_LineOpening (in->d.line); + if (openrange <= 0) + { + S_StartSound (usething, sfx_noway); + + // can't use through a wall + return false; + } + // not a special line, but keep checking + return true ; + } + + side = 0; + if (P_PointOnLineSide (usething->x, usething->y, in->d.line) == 1) + side = 1; + + // return false; // don't use back side + + P_UseSpecialLine (usething, in->d.line, side); + + // can't use for than one special line in a row + return false; +} + + +// +// P_UseLines +// Looks for special lines in front of the player to activate. +// +void P_UseLines (player_t* player) +{ + int angle; + fixed_t x1; + fixed_t y1; + fixed_t x2; + fixed_t y2; + + usething = player->mo; + + angle = player->mo->angle >> ANGLETOFINESHIFT; + + x1 = player->mo->x; + y1 = player->mo->y; + x2 = x1 + (USERANGE>>FRACBITS)*finecosine[angle]; + y2 = y1 + (USERANGE>>FRACBITS)*finesine[angle]; + + P_PathTraverse ( x1, y1, x2, y2, PT_ADDLINES, PTR_UseTraverse ); +} + + +// +// RADIUS ATTACK +// +mobj_t* bombsource; +mobj_t* bombspot; +int bombdamage; + + +// +// PIT_RadiusAttack +// "bombsource" is the creature +// that caused the explosion at "bombspot". +// +boolean PIT_RadiusAttack (mobj_t* thing) +{ + fixed_t dx; + fixed_t dy; + fixed_t dist; + + if (!(thing->flags & MF_SHOOTABLE) ) + return true; + + // Boss spider and cyborg + // take no damage from concussion. + if (thing->type == MT_CYBORG + || thing->type == MT_SPIDER) + return true; + + dx = abs(thing->x - bombspot->x); + dy = abs(thing->y - bombspot->y); + + dist = dx>dy ? dx : dy; + dist = (dist - thing->radius) >> FRACBITS; + + if (dist < 0) + dist = 0; + + if (dist >= bombdamage) + return true; // out of range + + if ( P_CheckSight (thing, bombspot) ) + { + // must be in direct path + P_DamageMobj (thing, bombspot, bombsource, bombdamage - dist); + } + + return true; +} + + +// +// P_RadiusAttack +// Source is the creature that caused the explosion at spot. +// +void +P_RadiusAttack +( mobj_t* spot, + mobj_t* source, + int damage ) +{ + int x; + int y; + + int xl; + int xh; + int yl; + int yh; + + fixed_t dist; + + dist = (damage+MAXRADIUS)<<FRACBITS; + yh = (spot->y + dist - bmaporgy)>>MAPBLOCKSHIFT; + yl = (spot->y - dist - bmaporgy)>>MAPBLOCKSHIFT; + xh = (spot->x + dist - bmaporgx)>>MAPBLOCKSHIFT; + xl = (spot->x - dist - bmaporgx)>>MAPBLOCKSHIFT; + bombspot = spot; + bombsource = source; + bombdamage = damage; + + for (y=yl ; y<=yh ; y++) + for (x=xl ; x<=xh ; x++) + P_BlockThingsIterator (x, y, PIT_RadiusAttack ); +} + + + +// +// SECTOR HEIGHT CHANGING +// After modifying a sectors floor or ceiling height, +// call this routine to adjust the positions +// of all things that touch the sector. +// +// If anything doesn't fit anymore, true will be returned. +// If crunch is true, they will take damage +// as they are being crushed. +// If Crunch is false, you should set the sector height back +// the way it was and call P_ChangeSector again +// to undo the changes. +// +boolean crushchange; +boolean nofit; + + +// +// PIT_ChangeSector +// +boolean PIT_ChangeSector (mobj_t* thing) +{ + mobj_t* mo; + + if (P_ThingHeightClip (thing)) + { + // keep checking + return true; + } + + + // crunch bodies to giblets + if (thing->health <= 0) + { + P_SetMobjState (thing, S_GIBS); + + thing->flags &= ~MF_SOLID; + thing->height = 0; + thing->radius = 0; + + // keep checking + return true; + } + + // crunch dropped items + if (thing->flags & MF_DROPPED) + { + P_RemoveMobj (thing); + + // keep checking + return true; + } + + if (! (thing->flags & MF_SHOOTABLE) ) + { + // assume it is bloody gibs or something + return true; + } + + nofit = true; + + if (crushchange && !(leveltime&3) ) + { + P_DamageMobj(thing,NULL,NULL,10); + + // spray blood in a random direction + mo = P_SpawnMobj (thing->x, + thing->y, + thing->z + thing->height/2, MT_BLOOD); + + mo->momx = (P_Random() - P_Random ())<<12; + mo->momy = (P_Random() - P_Random ())<<12; + } + + // keep checking (crush other things) + return true; +} + + + +// +// P_ChangeSector +// +boolean +P_ChangeSector +( sector_t* sector, + boolean crunch ) +{ + int x; + int y; + + nofit = false; + crushchange = crunch; + + // re-check heights for all things near the moving sector + for (x=sector->blockbox[BOXLEFT] ; x<= sector->blockbox[BOXRIGHT] ; x++) + for (y=sector->blockbox[BOXBOTTOM];y<= sector->blockbox[BOXTOP] ; y++) + P_BlockThingsIterator (x, y, PIT_ChangeSector); + + + return nofit; +} + |