forked from Mirrors/openclonk
611 lines
17 KiB
C++
611 lines
17 KiB
C++
/*
|
|
* OpenClonk, http://www.openclonk.org
|
|
*
|
|
* Copyright (c) 2001-2009, RedWolf Design GmbH, http://www.clonk.de
|
|
*
|
|
* Portions might be copyrighted by other authors who have contributed
|
|
* to OpenClonk.
|
|
*
|
|
* Permission to use, copy, modify, and/or distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
* See isc_license.txt for full license and disclaimer.
|
|
*
|
|
* "Clonk" is a registered trademark of Matthes Bender.
|
|
* See clonk_trademark_license.txt for full license.
|
|
*/
|
|
|
|
/* Object motion, collision, friction */
|
|
|
|
#include <C4Include.h>
|
|
#include <C4Object.h>
|
|
|
|
#ifndef BIG_C4INCLUDE
|
|
#include <C4Physics.h>
|
|
#include <C4SolidMask.h>
|
|
#include <C4Wrappers.h>
|
|
#endif
|
|
|
|
/* Some physical constants */
|
|
|
|
const FIXED FRedirect=FIXED100(50);
|
|
const FIXED FFriction=FIXED100(30);
|
|
const FIXED FixFullCircle=itofix(360),FixHalfCircle=FixFullCircle/2;
|
|
const FIXED FloatFriction=FIXED100(2);
|
|
const FIXED RotateAccel=FIXED100(20);
|
|
const FIXED FloatAccel=FIXED100(10);
|
|
const FIXED WalkAccel=FIXED100(50),SwimAccel=FIXED100(20);
|
|
const FIXED HitSpeed1=FIXED100(150); // Hit Event
|
|
const FIXED HitSpeed2=itofix(2); // Cross Check Hit
|
|
const FIXED HitSpeed3=itofix(6); // Scale disable, kneel
|
|
const FIXED HitSpeed4=itofix(8); // Flat
|
|
|
|
/* Some helper functions */
|
|
|
|
void RedirectForce(FIXED &from, FIXED &to, int32_t tdir)
|
|
{
|
|
FIXED fred;
|
|
fred=Min(Abs(from), FRedirect);
|
|
from-=fred*Sign(from);
|
|
to+=fred*tdir;
|
|
}
|
|
|
|
void ApplyFriction(FIXED &tval, int32_t percent)
|
|
{
|
|
FIXED ffric=FFriction*percent/100;
|
|
if (tval>+ffric) { tval-=ffric; return; }
|
|
if (tval<-ffric) { tval+=ffric; return; }
|
|
tval=0;
|
|
}
|
|
|
|
// Compares all Shape.VtxContactCNAT[] CNAT flags to search flag.
|
|
// Returns true if CNAT match has been found.
|
|
|
|
BOOL ContactVtxCNAT(C4Object *cobj, BYTE cnat_dir)
|
|
{
|
|
int32_t cnt;
|
|
BOOL fcontact=FALSE;
|
|
for (cnt=0; cnt<cobj->Shape.VtxNum; cnt++)
|
|
if (cobj->Shape.VtxContactCNAT[cnt] & cnat_dir)
|
|
fcontact=TRUE;
|
|
return fcontact;
|
|
}
|
|
|
|
// Finds first vertex with contact flag set.
|
|
// Returns -1/0/+1 for relation on vertex to object center.
|
|
|
|
int32_t ContactVtxWeight(C4Object *cobj)
|
|
{
|
|
int32_t cnt;
|
|
for (cnt=0; cnt<cobj->Shape.VtxNum; cnt++)
|
|
if (cobj->Shape.VtxContactCNAT[cnt])
|
|
{
|
|
if (cobj->Shape.VtxX[cnt]<0) return -1;
|
|
if (cobj->Shape.VtxX[cnt]>0) return +1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
// ContactVtxFriction: Returns 0-100 friction value of first
|
|
// contacted vertex;
|
|
|
|
int32_t ContactVtxFriction(C4Object *cobj)
|
|
{
|
|
int32_t cnt;
|
|
for (cnt=0; cnt<cobj->Shape.VtxNum; cnt++)
|
|
if (cobj->Shape.VtxContactCNAT[cnt])
|
|
return cobj->Shape.VtxFriction[cnt];
|
|
return 0;
|
|
}
|
|
|
|
const char *CNATName(int32_t cnat)
|
|
{
|
|
switch (cnat)
|
|
{
|
|
case CNAT_None: return "None";
|
|
case CNAT_Left: return "Left";
|
|
case CNAT_Right: return "Right";
|
|
case CNAT_Top: return "Top";
|
|
case CNAT_Bottom: return "Bottom";
|
|
case CNAT_Center: return "Center";
|
|
}
|
|
return "Undefined";
|
|
}
|
|
|
|
BOOL C4Object::Contact(int32_t iCNAT)
|
|
{
|
|
if (Def->ContactFunctionCalls)
|
|
{
|
|
return !! Call(FormatString(PSF_Contact, CNATName(iCNAT)).getData());
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
void C4Object::DoMotion(int32_t mx, int32_t my)
|
|
{
|
|
if (pSolidMaskData) pSolidMaskData->Remove(true, true);
|
|
fix_x += mx; fix_y += my;
|
|
}
|
|
|
|
void C4Object::TargetBounds(int32_t &ctco, int32_t limit_low, int32_t limit_hi, int32_t cnat_low, int32_t cnat_hi)
|
|
{
|
|
switch (ForceLimits(ctco,limit_low,limit_hi))
|
|
{
|
|
case -1:
|
|
// stop
|
|
if (cnat_low==CNAT_Left) xdir=0; else ydir=0;
|
|
// do calls
|
|
Contact(cnat_low);
|
|
break;
|
|
case +1:
|
|
// stop
|
|
if (cnat_hi==CNAT_Right) xdir=0; else ydir=0;
|
|
// do calls
|
|
Contact(cnat_hi);
|
|
break;
|
|
}
|
|
}
|
|
|
|
int32_t C4Object::ContactCheck(int32_t iAtX, int32_t iAtY)
|
|
{
|
|
// Check shape contact at given position
|
|
Shape.ContactCheck(iAtX,iAtY);
|
|
|
|
// Store shape contact values in object t_contact
|
|
t_contact=Shape.ContactCNAT;
|
|
|
|
// Contact script call for the first contacted cnat
|
|
if (Shape.ContactCNAT)
|
|
for (int32_t ccnat=0; ccnat<4; ccnat++) // Left, right, top bottom
|
|
if (Shape.ContactCNAT & (1<<ccnat))
|
|
if (Contact(1<<ccnat))
|
|
break; // Will stop on first positive return contact call!
|
|
|
|
// Return shape contact count
|
|
return Shape.ContactCount;
|
|
}
|
|
|
|
void C4Object::SideBounds(int32_t &ctcox)
|
|
{
|
|
// layer bounds
|
|
if (pLayer) if (pLayer->Def->BorderBound & C4D_Border_Layer)
|
|
if (Action.Act<=ActIdle || Def->ActMap[Action.Act].Procedure != DFA_ATTACH)
|
|
if (Category & C4D_StaticBack)
|
|
TargetBounds(ctcox,pLayer->GetX()+pLayer->Shape.GetX(),pLayer->GetX()+pLayer->Shape.GetX()+pLayer->Shape.Wdt,CNAT_Left,CNAT_Right);
|
|
else
|
|
TargetBounds(ctcox,pLayer->GetX()+pLayer->Shape.GetX()-Shape.GetX(),pLayer->GetX()+pLayer->Shape.GetX()+pLayer->Shape.Wdt+Shape.GetX(),CNAT_Left,CNAT_Right);
|
|
// landscape bounds
|
|
if (Def->BorderBound & C4D_Border_Sides)
|
|
TargetBounds(ctcox,0-Shape.GetX(),GBackWdt+Shape.GetX(),CNAT_Left,CNAT_Right);
|
|
}
|
|
|
|
void C4Object::VerticalBounds(int32_t &ctcoy)
|
|
{
|
|
// layer bounds
|
|
if (pLayer) if (pLayer->Def->BorderBound & C4D_Border_Layer)
|
|
if (Action.Act<=ActIdle || Def->ActMap[Action.Act].Procedure != DFA_ATTACH)
|
|
if (Category & C4D_StaticBack)
|
|
TargetBounds(ctcoy,pLayer->GetY()+pLayer->Shape.GetY(),pLayer->GetY()+pLayer->Shape.GetY()+pLayer->Shape.Hgt,CNAT_Top,CNAT_Bottom);
|
|
else
|
|
TargetBounds(ctcoy,pLayer->GetY()+pLayer->Shape.GetY()-Shape.GetY(),pLayer->GetY()+pLayer->Shape.GetY()+pLayer->Shape.Hgt+Shape.GetY(),CNAT_Top,CNAT_Bottom);
|
|
// landscape bounds
|
|
if (Def->BorderBound & C4D_Border_Top)
|
|
TargetBounds(ctcoy,0-Shape.GetY(),+1000000,CNAT_Top,CNAT_Bottom);
|
|
if (Def->BorderBound & C4D_Border_Bottom)
|
|
TargetBounds(ctcoy,-1000000,GBackHgt+Shape.GetY(),CNAT_Top,CNAT_Bottom);
|
|
}
|
|
|
|
void C4Object::DoMovement()
|
|
{
|
|
int32_t ctcox,ctcoy,ctcor/*,ctx,cty*/,iContact=0;
|
|
BOOL fAnyContact=FALSE, iContacts = 0;
|
|
BYTE fTurned=0,fRedirectYR=0,fNoAttach=0;
|
|
// Restrictions
|
|
if (Def->NoHorizontalMove) xdir=0;
|
|
// Dig free target area
|
|
if (Action.Act>ActIdle)
|
|
if (Def->ActMap[Action.Act].DigFree)
|
|
{
|
|
// Shape size square
|
|
if (Def->ActMap[Action.Act].DigFree==1)
|
|
{
|
|
ctcox=fixtoi(fix_x+xdir); ctcoy=fixtoi(fix_y+ydir);
|
|
Game.Landscape.DigFreeRect(ctcox+Shape.GetX(),ctcoy+Shape.GetY(),Shape.Wdt,Shape.Hgt,Action.Data,this);
|
|
}
|
|
// Free size round (variable size)
|
|
else
|
|
{
|
|
ctcox=fixtoi(fix_x+xdir); ctcoy=fixtoi(fix_y+ydir);
|
|
int32_t rad = Def->ActMap[Action.Act].DigFree;
|
|
if (Con<FullCon) rad = rad*6*Con/5/FullCon;
|
|
Game.Landscape.DigFree(ctcox,ctcoy-1,rad,Action.Data,this);
|
|
}
|
|
}
|
|
|
|
// store previous position
|
|
int32_t ix0=GetX(); int32_t iy0=GetY();
|
|
|
|
// store previous movement and ocf
|
|
FIXED oldxdir(xdir), oldydir(ydir);
|
|
uint32_t old_ocf = OCF;
|
|
|
|
FIXED new_x = fix_x + xdir;
|
|
FIXED new_y = fix_y + ydir;
|
|
ctcox=fixtoi(new_x);
|
|
SideBounds(ctcox);
|
|
if (!Action.t_attach) // Unattached movement = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
|
|
{
|
|
// Horizontal movement - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|
|
// Move to target
|
|
while (GetX()!=ctcox)
|
|
{
|
|
// Next step
|
|
int step = Sign(ctcox - GetX());
|
|
if (iContact=ContactCheck(GetX() + step, GetY()))
|
|
{
|
|
fAnyContact=TRUE; iContacts |= t_contact;
|
|
// Abort horizontal movement
|
|
ctcox = GetX();
|
|
new_x = fix_x;
|
|
// Vertical redirection (always)
|
|
RedirectForce(xdir,ydir,-1);
|
|
ApplyFriction(ydir,ContactVtxFriction(this));
|
|
}
|
|
else // Free horizontal movement
|
|
DoMotion(step, 0);
|
|
}
|
|
// Vertical movement - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|
|
// Movement target
|
|
ctcoy=fixtoi(fix_y + ydir);
|
|
new_y = fix_y + ydir;
|
|
// Movement bounds (vertical)
|
|
VerticalBounds(ctcoy);
|
|
// Move to target
|
|
while (GetY()!=ctcoy)
|
|
{
|
|
// Next step
|
|
int step = Sign(ctcoy - GetY());
|
|
if (iContact=ContactCheck(GetX(), GetY() + step))
|
|
{
|
|
fAnyContact=TRUE; iContacts |= t_contact;
|
|
ctcoy=GetY(); new_y = fix_y;
|
|
// Vertical contact horizontal friction
|
|
ApplyFriction(xdir,ContactVtxFriction(this));
|
|
// Redirection slide or rotate
|
|
if (!ContactVtxCNAT(this,CNAT_Left))
|
|
RedirectForce(ydir,xdir,-1);
|
|
else if (!ContactVtxCNAT(this,CNAT_Right))
|
|
RedirectForce(ydir,xdir,+1);
|
|
else
|
|
{
|
|
// living things are always capable of keeping their rotation
|
|
if (OCF & OCF_Rotate) if (iContact==1) if (!Alive)
|
|
{
|
|
RedirectForce(ydir,rdir,-ContactVtxWeight(this));
|
|
fRedirectYR=1;
|
|
}
|
|
ydir=0;
|
|
}
|
|
}
|
|
else // Free vertical movement
|
|
DoMotion(0,step);
|
|
}
|
|
}
|
|
if (Action.t_attach) // Attached movement = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
|
|
{
|
|
ctcoy=fixtoi(new_y);
|
|
VerticalBounds(ctcoy);
|
|
bool at_xovr,at_yovr;
|
|
// Move to target
|
|
do
|
|
{
|
|
at_xovr=at_yovr=0;
|
|
// Set next step target
|
|
int step_x = Sign(ctcox-GetX());
|
|
int step_y = Sign(ctcoy-GetY());
|
|
int32_t ctx = GetX() + step_x; int32_t cty = GetY() + step_y;
|
|
// Attachment check
|
|
if (!Shape.Attach(ctx,cty,Action.t_attach))
|
|
fNoAttach=1;
|
|
else
|
|
{
|
|
// Attachment change to ctx/cty overrides ctco target
|
|
if (cty != GetY() + step_y) at_yovr = true;
|
|
if (ctx != GetX() + step_x) at_xovr = true;
|
|
}
|
|
// Contact check & evaluation
|
|
if (iContact=ContactCheck(ctx,cty))
|
|
{
|
|
fAnyContact=TRUE; iContacts |= t_contact;
|
|
// Abort movement
|
|
ctcox=GetX(); new_x = fix_x;
|
|
ctcoy=GetY(); new_y = fix_y;
|
|
}
|
|
else // Continue free movement
|
|
DoMotion(ctx-GetX(),cty-GetY());
|
|
if (at_xovr) { ctcox=GetX(); xdir=Fix0; new_x = fix_x; }
|
|
if (at_yovr) { ctcoy=GetY(); ydir=Fix0; new_y = fix_y; }
|
|
}
|
|
while ((GetX()!=ctcox) || (GetY()!=ctcoy));
|
|
}
|
|
fix_x = new_x;
|
|
fix_y = new_y;
|
|
// Rotation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|
|
if (OCF & OCF_Rotate && !!rdir)
|
|
{
|
|
// Set target
|
|
fix_r+=rdir*5;
|
|
// Rotation limit
|
|
if (Def->Rotateable>1)
|
|
{
|
|
if (fix_r > itofix(Def->Rotateable))
|
|
{ fix_r = itofix(Def->Rotateable); rdir=0; }
|
|
if (fix_r < itofix(-Def->Rotateable))
|
|
{ fix_r = itofix(-Def->Rotateable); rdir=0; }
|
|
}
|
|
ctcor=fixtoi(fix_r);
|
|
int32_t ctx=GetX(); int32_t cty=GetY();
|
|
// Move to target
|
|
while (r!=ctcor)
|
|
{
|
|
// Save step undos
|
|
int32_t lcobjr=r; C4Shape lshape=Shape;
|
|
// Try next step
|
|
r+=Sign(ctcor-r);
|
|
UpdateShape();
|
|
// attached rotation: rotate around attachment pos
|
|
if (Action.t_attach && !fNoAttach)
|
|
{
|
|
// more accurately, attachment should be evaluated by a rotation around the attachment vertex
|
|
// however, as long as this code is only used for some surfaces adjustment for large vehicles,
|
|
// it's enough to assume rotation around the center
|
|
ctx=GetX(); cty=GetY();
|
|
// evaluate attachment, but do not bother about attachment loss
|
|
// that will then be done in next execution cycle
|
|
Shape.Attach(ctx,cty,Action.t_attach);
|
|
}
|
|
// check for contact
|
|
if (iContact=ContactCheck(ctx,cty)) // Contact
|
|
{
|
|
fAnyContact=TRUE; iContacts |= t_contact;
|
|
// Undo step and abort movement
|
|
Shape=lshape;
|
|
r=lcobjr;
|
|
ctcor=r;
|
|
fix_r=itofix(r);
|
|
// last UpdateShape-call might have changed sector lists!
|
|
UpdatePos();
|
|
// Redirect to GetY()
|
|
if (iContact==1) if (!fRedirectYR)
|
|
RedirectForce(rdir,ydir,-1);
|
|
// Stop rotation
|
|
rdir=0;
|
|
}
|
|
else
|
|
{
|
|
fTurned=1;
|
|
fix_x=itofix(ctx); fix_y=itofix(cty);
|
|
}
|
|
}
|
|
// Circle bounds
|
|
if (fix_r<-FixHalfCircle) { fix_r+=FixFullCircle; r=fixtoi(fix_r); }
|
|
if (fix_r>+FixHalfCircle) { fix_r-=FixFullCircle; r=fixtoi(fix_r); }
|
|
}
|
|
// Reput solid mask: Might have been removed by motion or
|
|
// motion might be out of date from last frame.
|
|
UpdateSolidMask(true);
|
|
// Misc checks ===========================================================================================
|
|
// InLiquid check
|
|
// this equals C4Object::UpdateLiquid, but the "fNoAttach=FALSE;"-line
|
|
if (IsInLiquidCheck()) // In Liquid
|
|
{
|
|
if (!InLiquid) // Enter liquid
|
|
{
|
|
if (OCF & OCF_HitSpeed2) if (Mass>3)
|
|
Splash(GetX(),GetY()+1,Min(Shape.Wdt*Shape.Hgt/10,20),this);
|
|
fNoAttach=FALSE;
|
|
InLiquid=1;
|
|
}
|
|
}
|
|
else // Out of liquid
|
|
{
|
|
if (InLiquid) // Leave liquid
|
|
InLiquid=0;
|
|
}
|
|
// Contact Action
|
|
if (fAnyContact)
|
|
{
|
|
t_contact = iContacts;
|
|
ContactAction();
|
|
}
|
|
// Attachment Loss Action
|
|
if (fNoAttach)
|
|
NoAttachAction();
|
|
// Movement Script Execution
|
|
if (fAnyContact)
|
|
{
|
|
C4AulParSet pars(C4VInt(fixtoi(oldxdir, 100)), C4VInt(fixtoi(oldydir, 100)));
|
|
if (old_ocf & OCF_HitSpeed1) Call(PSF_Hit, &pars);
|
|
if (old_ocf & OCF_HitSpeed2) Call(PSF_Hit2, &pars);
|
|
if (old_ocf & OCF_HitSpeed3) Call(PSF_Hit3, &pars);
|
|
}
|
|
// Rotation gfx
|
|
if (fTurned)
|
|
UpdateFace(true);
|
|
else
|
|
// pos changed?
|
|
if ((ix0-GetX())|(iy0-GetY())) UpdatePos();
|
|
}
|
|
|
|
void C4Object::Stabilize()
|
|
{
|
|
// def allows stabilization?
|
|
if (Def->NoStabilize) return;
|
|
// normalize angle
|
|
int32_t nr = r; while(nr < -180) nr+=360; while(nr > 180) nr-=360;
|
|
if (nr!=0)
|
|
if (Inside<int32_t>(nr,-StableRange,+StableRange))
|
|
{
|
|
// Save step undos
|
|
int32_t lcobjr=r;
|
|
C4Shape lshape=Shape;
|
|
// Try rotation
|
|
r=0;
|
|
UpdateShape();
|
|
if (ContactCheck(GetX(),GetY()))
|
|
{ // Undo rotation
|
|
Shape=lshape;
|
|
r=lcobjr;
|
|
}
|
|
else
|
|
{ // Stabilization okay
|
|
fix_r=itofix(r);
|
|
UpdateFace(true);
|
|
}
|
|
}
|
|
}
|
|
|
|
void C4Object::CopyMotion(C4Object *from)
|
|
{
|
|
// Designed for contained objects, no static
|
|
if (fix_x != from->fix_x || fix_y != from->fix_y)
|
|
{
|
|
fix_x=from->fix_x; fix_y=from->fix_y;
|
|
// Resort into sectors
|
|
UpdatePos();
|
|
}
|
|
xdir=from->xdir; ydir=from->ydir;
|
|
}
|
|
|
|
void C4Object::ForcePosition(int32_t tx, int32_t ty)
|
|
{
|
|
fix_x=itofix(tx); fix_y=itofix(ty);
|
|
UpdatePos();
|
|
UpdateSolidMask(false);
|
|
}
|
|
|
|
void C4Object::MovePosition(int32_t dx, int32_t dy)
|
|
{
|
|
// move object position; repositions SolidMask
|
|
if (pSolidMaskData) pSolidMaskData->Remove(true, true);
|
|
fix_x+=dx;
|
|
fix_y+=dy;
|
|
UpdatePos();
|
|
UpdateSolidMask(true);
|
|
}
|
|
|
|
|
|
BOOL C4Object::ExecMovement() // Every Tick1 by Execute
|
|
{
|
|
|
|
// Containment check
|
|
if (Contained)
|
|
{
|
|
CopyMotion(Contained);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
// General mobility check
|
|
if (Category & C4D_StaticBack) return FALSE;
|
|
|
|
// Movement execution
|
|
if (Mobile) // Object is moving
|
|
{
|
|
// Move object
|
|
DoMovement();
|
|
// Demobilization check
|
|
if ((xdir==0) && (ydir==0) && (rdir==0)) Mobile=0;
|
|
// Check for stabilization
|
|
if (rdir==0) Stabilize();
|
|
}
|
|
else // Object is static
|
|
{
|
|
// Check for stabilization
|
|
Stabilize();
|
|
// Check for mobilization
|
|
if (!Tick10)
|
|
{
|
|
// Gravity mobilization
|
|
xdir=ydir=rdir=0;
|
|
fix_r=itofix(r);
|
|
Mobile=1;
|
|
}
|
|
}
|
|
|
|
// Enforce zero rotation
|
|
if (!Def->Rotateable) r=0;
|
|
|
|
// Out of bounds check
|
|
if ((!Inside<int32_t>(GetX(),0,GBackWdt) && !(Def->BorderBound & C4D_Border_Sides)) || (GetY()>GBackHgt && !(Def->BorderBound & C4D_Border_Bottom)))
|
|
// Never remove attached objects: If they are truly outside landscape, their target will be removed,
|
|
// and the attached objects follow one frame later
|
|
if (Action.Act<0 || !Action.Target || Def->ActMap[Action.Act].Procedure != DFA_ATTACH)
|
|
{
|
|
bool fRemove = true;
|
|
// never remove HUD objects
|
|
if (Category & C4D_Parallax)
|
|
{
|
|
fRemove = false;
|
|
if (GetX()>GBackWdt || GetY()>GBackHgt) fRemove = true; // except if they are really out of the viewport to the right...
|
|
else if (GetX()<0 && Local[0].getBool()) fRemove = true; // ...or it's not HUD horizontally and it's out to the left
|
|
else if (!Local[0].getBool() && GetX()<-GBackWdt) fRemove = true; // ...or it's HUD horizontally and it's out to the left
|
|
}
|
|
if (fRemove)
|
|
{
|
|
AssignDeath(true);
|
|
AssignRemoval();
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
bool SimFlight(FIXED &x, FIXED &y, FIXED &xdir, FIXED &ydir, int32_t iDensityMin, int32_t iDensityMax, int32_t iIter)
|
|
{
|
|
bool fBreak = false;
|
|
int32_t ctcox,ctcoy,cx,cy;
|
|
cx = fixtoi(x); cy = fixtoi(y);
|
|
do
|
|
{
|
|
if(!iIter--) return false;
|
|
// Set target position by momentum
|
|
x+=xdir; y+=ydir;
|
|
// Movement to target
|
|
ctcox=fixtoi(x); ctcoy=fixtoi(y);
|
|
// Bounds
|
|
if (!Inside<int32_t>(ctcox,0,GBackWdt) || (ctcoy>=GBackHgt)) return false;
|
|
// Move to target
|
|
do
|
|
{
|
|
// Set next step target
|
|
cx+=Sign(ctcox-cx); cy+=Sign(ctcoy-cy);
|
|
// Contact check
|
|
if(Inside(GBackDensity(cx,cy), iDensityMin, iDensityMax))
|
|
{ fBreak = true; break; }
|
|
}
|
|
while ((cx!=ctcox) || (cy!=ctcoy));
|
|
// Adjust GravAccel once per frame
|
|
ydir+=GravAccel;
|
|
}
|
|
while(!fBreak);
|
|
// write position back
|
|
x = itofix(cx); y = itofix(cy);
|
|
// ok
|
|
return true;
|
|
}
|
|
|
|
BOOL SimFlightHitsLiquid(FIXED fcx, FIXED fcy, FIXED xdir, FIXED ydir)
|
|
{
|
|
// Start in water?
|
|
if(DensityLiquid(GBackDensity(fixtoi(fcx), fixtoi(fcy))))
|
|
if(!SimFlight(fcx, fcy, xdir, ydir, 0, C4M_Liquid - 1, 10))
|
|
return FALSE;
|
|
// Hits liquid?
|
|
if(!SimFlight(fcx, fcy, xdir, ydir, C4M_Liquid, 100, -1))
|
|
return FALSE;
|
|
// liquid & deep enough?
|
|
return GBackLiquid(fixtoi(fcx), fixtoi(fcy)) && GBackLiquid(fixtoi(fcx), fixtoi(fcy) + 9);
|
|
}
|
|
|