C4Movement.cpp File Reference

#include "C4Include.h"
#include "game/C4Physics.h"
#include "landscape/C4Landscape.h"
#include "landscape/C4SolidMask.h"
#include "object/C4Def.h"
#include "object/C4Object.h"
#include "script/C4Effect.h"

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Functions
void	RedirectForce (C4Real &from, C4Real &to, int32_t tdir)
void	ApplyFriction (C4Real &tval, int32_t percent)
bool	ContactVtxCNAT (C4Object *object, BYTE cnat_dir)
int32_t	ContactVtxWeight (C4Object *object)
int32_t	ContactVtxFriction (C4Object *object)
const char *	CNATName (int32_t cnat)
bool	SimFlight (C4Real &x, C4Real &y, C4Real &xdir, C4Real &ydir, int32_t min_density, int32_t max_density, int32_t &iterations)
bool	SimFlightHitsLiquid (C4Real start_x, C4Real start_y, C4Real xdir, C4Real ydir)

Variables
const C4Real	FRedirect = C4REAL100(50)
const C4Real	FFriction = C4REAL100(30)
const C4Real	FixFullCircle = itofix(360)
const C4Real	FixHalfCircle = FixFullCircle / 2
const C4Real	FloatFriction = C4REAL100(2)
const C4Real	RotateAccel = C4REAL100(20)
const C4Real	HitSpeed1 = C4REAL100(150)
const C4Real	HitSpeed2 = itofix(2)
const C4Real	HitSpeed3 = itofix(6)
const C4Real	HitSpeed4 = itofix(8)
const C4Real	DefaultGravAccel = C4REAL100(20)

Function Documentation

ApplyFriction()

void ApplyFriction	(	C4Real &	tval,
		int32_t	percent
	)

Definition at line 52 of file C4Movement.cpp.

{
    C4Real ffric = FFriction * percent / 100;
    if (tval > +ffric)
    {
        tval -= ffric;
    }
    else if (tval < -ffric)
    {
        tval += ffric;
    }
    else
    {
        tval = 0;
    }
}

References FFriction.

Referenced by C4Object::DoMovement().

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CNATName()

const char* CNATName

(

int32_t

cnat

)

Definition at line 121 of file C4Movement.cpp.

{
    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";
}

References CNAT_Bottom, CNAT_Center, CNAT_Left, CNAT_None, CNAT_Right, and CNAT_Top.

Referenced by C4Object::Contact().

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ContactVtxCNAT()

bool ContactVtxCNAT	(	C4Object *	object,
		BYTE	cnat_dir
	)

Definition at line 72 of file C4Movement.cpp.

{
    for (int32_t index = 0; index < object->Shape.VtxNum; index++)
    {
        if (object->Shape.VtxContactCNAT[index] & cnat_dir)
        {
            return true;
        }
    }
    return false;
}

References C4Object::Shape, and C4Shape::VtxContactCNAT.

Referenced by C4Object::DoMovement().

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ContactVtxFriction()

int32_t ContactVtxFriction

(

C4Object *

object

)

Definition at line 109 of file C4Movement.cpp.

{
    for (int32_t index = 0; index < object->Shape.VtxNum; index++)
    {
        if (object->Shape.VtxContactCNAT[index])
        {
            return object->Shape.VtxFriction[index];
        }
    }
    return 0;
}

References C4Object::Shape, and C4Shape::VtxContactCNAT.

Referenced by C4Object::DoMovement().

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ContactVtxWeight()

int32_t ContactVtxWeight

(

C4Object *

object

)

Definition at line 87 of file C4Movement.cpp.

{
    for (int32_t index = 0; index < object->Shape.VtxNum; index++)
    {
        if (object->Shape.VtxContactCNAT[index])
        {
            if (object->Shape.VtxX[index] < 0)
            {
                return -1;
            }
            if (object->Shape.VtxX[index] > 0)
            {
                return +1;
            }
        }
    }
    return 0;
}

References C4Object::Shape, C4Shape::VtxContactCNAT, and C4Shape::VtxX.

Referenced by C4Object::DoMovement().

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RedirectForce()

void RedirectForce	(	C4Real &	from,
		C4Real &	to,
		int32_t	tdir
	)

Definition at line 45 of file C4Movement.cpp.

{
    C4Real force_redirected = std::min(Abs(from), FRedirect);
    from -= force_redirected * Sign(from);
    to += force_redirected * tdir;
}

References Abs(), FRedirect, and Sign().

Referenced by C4Object::DoMovement().

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SimFlight()

bool SimFlight	(	C4Real &	x,
		C4Real &	y,
		C4Real &	xdir,
		C4Real &	ydir,
		int32_t	min_density,
		int32_t	max_density,
		int32_t &	iterations
	)

Definition at line 810 of file C4Movement.cpp.

{
    bool hit_on_time = true;
    bool break_main_loop = false;
    int32_t target_x, target_y;
    int32_t current_x = fixtoi(x);
    int32_t current_y = fixtoi(y);
    int32_t index = iterations;
    do
    {
        if (!--index)
        {
            hit_on_time = false;
            break;
        }
        // If the object isn't moving and there is no gravity either, abort
        if (xdir == 0 && ydir == 0 && GravAccel == 0)
        {
            return false;
        }
        // If the object is above the landscape flying upwards in no/negative gravity, abort
        if (ydir <= 0 && GravAccel <= 0 && current_y < 0)
        {
            return false;
        }
        // Set target position by momentum
        x += xdir;
        y += ydir;
        // Set target position, then iterate towards this position, checking for contact
        target_x = fixtoi(x);
        target_y = fixtoi(y);
        // Is the target position outside of the landscape?
        if (!Inside<int32_t>(target_x, 0, ::Landscape.GetWidth()) || (target_y >= ::Landscape.GetHeight()))
        {
            return false;
        }
        // Check the way towards the target position, by doing minimal movement steps
        do
        {
            // Set next step target
            current_x += Sign(target_x - current_x);
            current_y += Sign(target_y - current_y);
            // Contact check
            if (Inside(GBackDensity(current_x, current_y), min_density, max_density))
            {
                break_main_loop = true;
                break;
            }
        }
        while ((current_x != target_x) || (current_y != target_y));
        // Adjust GravAccel once per frame
        ydir += GravAccel;
    }
    while (!break_main_loop);
    // Write position back
    x = itofix(current_x);
    y = itofix(current_y);
 
    // How many steps did it take to get here?
    iterations -= index;
 
    return hit_on_time;
}

References fixtoi(), GBackDensity(), C4Landscape::GetHeight(), C4Landscape::GetWidth(), GravAccel, Inside(), itofix(), Landscape, and Sign().

Referenced by SimFlightHitsLiquid().

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SimFlightHitsLiquid()

bool SimFlightHitsLiquid	(	C4Real	start_x,
		C4Real	start_y,
		C4Real	xdir,
		C4Real	ydir
	)

Definition at line 874 of file C4Movement.cpp.

{
    // Start in water?
    if (DensityLiquid(GBackDensity(fixtoi(start_x), fixtoi(start_y))))
    {
        int temp = 10;
        if (!SimFlight(start_x, start_y, xdir, ydir, 0, C4M_Liquid - 1, temp))
        {
            return false;
        }
    }
    // Hits liquid?
    int temp = -1;
    if (!SimFlight(start_x, start_y, xdir, ydir, C4M_Liquid, C4M_Vehicle, temp))
    {
        return false;
    }
    // Liquid & deep enough?
    return GBackLiquid(fixtoi(start_x), fixtoi(start_y)) && GBackLiquid(fixtoi(start_x), fixtoi(start_y) + 9);
}

References C4M_Liquid, C4M_Vehicle, DensityLiquid(), fixtoi(), GBackDensity(), GBackLiquid(), and SimFlight().

Referenced by ObjectComJump().

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Variable Documentation

DefaultGravAccel

const C4Real DefaultGravAccel = C4REAL100(20)

Definition at line 41 of file C4Movement.cpp.

Referenced by C4Landscape::CompileFunc(), and C4Landscape::ScenarioInit().

FFriction

const C4Real FFriction = C4REAL100(30)

Definition at line 32 of file C4Movement.cpp.

Referenced by ApplyFriction().

FixFullCircle

const C4Real FixFullCircle = itofix(360)

Definition at line 33 of file C4Movement.cpp.

Referenced by C4Object::DoMovement().

FixHalfCircle

const C4Real FixHalfCircle = FixFullCircle / 2

Definition at line 34 of file C4Movement.cpp.

Referenced by C4Object::DoMovement().

FloatFriction

const C4Real FloatFriction = C4REAL100(2)

Definition at line 35 of file C4Movement.cpp.

FRedirect

const C4Real FRedirect = C4REAL100(50)

Definition at line 31 of file C4Movement.cpp.

Referenced by RedirectForce().

HitSpeed1

const C4Real HitSpeed1 = C4REAL100(150)

Definition at line 37 of file C4Movement.cpp.

Referenced by C4Object::SetOCF(), and C4Object::UpdateOCF().

HitSpeed2

const C4Real HitSpeed2 = itofix(2)

Definition at line 38 of file C4Movement.cpp.

HitSpeed3

const C4Real HitSpeed3 = itofix(6)

Definition at line 39 of file C4Movement.cpp.

HitSpeed4

const C4Real HitSpeed4 = itofix(8)

Definition at line 40 of file C4Movement.cpp.

RotateAccel

const C4Real RotateAccel = C4REAL100(20)

Definition at line 36 of file C4Movement.cpp.

Referenced by C4Object::Push().