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Monster Media 1993 #2
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ACKDOOR.C
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1993-06-20
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/* ACK-3D ( Animation Construction Kit 3D ) */
/* Door routines */
/* Author: Lary Myers */
#include <stdlib.h>
#include <stdio.h>
#include <dos.h>
#include <mem.h>
#include <alloc.h>
#include <io.h>
#include <fcntl.h>
#include <time.h>
#include <string.h>
#include <sys\stat.h>
#include "ack3d.h"
#include "ackext.h"
/****************************************************************************
** Locate a door from its Map coordinate and return the index to the **
** caller. **
** **
****************************************************************************/
int FindDoor(int MapPosn)
{
int index;
for (index = 0; index < MAX_DOORS; index++)
{
if (MapPosn == Door[index].mPos || MapPosn == Door[index].mPos1)
return(index);
}
return(-1);
}
/****************************************************************************
** Find an empty slot for a door. If the door already occupies a slot and **
** it is in a non-closed state then return error. **
** **
****************************************************************************/
int FindDoorSlot(int MapPosn)
{
int index;
index = FindDoor(MapPosn);
if (index >= 0 && Door[index].ColOffset)
return(-1);
for (index = 0; index < MAX_DOORS; index++)
{
if (Door[index].mPos == -1)
return(index);
}
return(-1);
}
/****************************************************************************
** Check all the doors to see what state they are in. If a door's column **
** offset is non-zero then it is either opening or closing, so add in the **
** speed of the door and check for fully open and fully closed conditions. **
** **
** **
****************************************************************************/
void CheckDoors(int xPlayer,int yPlayer)
{
int i,MapPosn,mPos,mPos1;
int column,mx,my,DeltaGrid;
unsigned char mCode,mCode1;
for (i = 0; i < MAX_DOORS; i++)
{
if (Door[i].ColOffset)
{
Door[i].ColOffset += Door[i].Speed;
mPos = Door[i].mPos;
mPos1 = Door[i].mPos1;
/* Door is closing and is visible. Put old codes back to make non-passable */
if (Door[i].Speed < 0 && Door[i].ColOffset < 65)
{
MapPosn = (yPlayer & 0xFFC0) + (xPlayer >> 6);
if (MapPosn == mPos ||
MapPosn == mPos1)
{
Door[i].ColOffset -= Door[i].Speed;
continue;
}
if (Door[i].Type == DOOR_XCODE)
{
if (xObjGrid[mPos] || xObjGrid[mPos1])
{
Door[i].ColOffset -= Door[i].Speed;
continue;
}
xGrid[mPos] = Door[i].mCode;
xGrid[mPos1] = Door[i].mCode1;
}
else
{
if (yObjGrid[mPos] || yObjGrid[mPos1])
{
Door[i].ColOffset -= Door[i].Speed;
continue;
}
yGrid[mPos] = Door[i].mCode;
yGrid[mPos1] = Door[i].mCode1;
}
/* Door is close enough to fully closed to get rid of the door from the array */
if (Door[i].ColOffset < 3)
{
Door[i].ColOffset = 0;
Door[i].mPos = -1;
Door[i].mPos1 = -1;
}
}
if (Door[i].ColOffset > 0xA0)
Door[i].Speed = -Door[i].Speed;
}
}
/* Now check for any action occuring in a secret door. This is currently */
/* setup to handle only one door at a time in the X and Y directions, but */
/* it should be fairly straightforward to use a list of doors, similiar */
/* to normal doors, to handle more than one. */
if (xSecretColumn)
{
if (xSecretColumn > 0) /* See if the door is to the right of us */
{
mPos = xSecretmPos1;
DeltaGrid = -1;
xSecretColumn += DoorSpeed;
}
else
{
mPos = xSecretmPos;
DeltaGrid = 0;
xSecretColumn -= DoorSpeed;
}
my = mPos & 0xFFC0;
mx = (mPos - my) << 6;
if (abs(xSecretColumn) > GRID_SIZE) /* Beyond one grid square */
{
mx += xSecretColumn;
my = my + (mx >> 6);
if (xGrid[my]) /* No further, an obstruction */
{
xGrid[xSecretmPos] = 0;
xGrid[xSecretmPos1] = 0;
my += DeltaGrid;
xGrid[my] = NonSecretCode;
xGrid[my+1] = NonSecretCode;
yGrid[my] = NonSecretCode;
yGrid[my + GRID_WIDTH] = NonSecretCode;
xSecretColumn = 0;
}
else
{
if (my != mPos)
{
xGrid[xSecretmPos] = 0;
xGrid[xSecretmPos1] = 0;
if (xSecretColumn > 0)
{
xSecretColumn -= 63;
xGrid[my] = DOOR_SECRETCODE;
xSecretmPos1 = my;
my--;
xGrid[my] = DOOR_SECRETCODE;
xSecretmPos = my;
}
else
{
xSecretColumn += 63;
xGrid[my] = DOOR_SECRETCODE;
xGrid[my+1] = DOOR_SECRETCODE;
xSecretmPos = my;
xSecretmPos = my+1;
}
}
} /* End if (xGrid[my]) ... else ... */
} /* End if (abs(xSecretColumn) > GRID_SIZE) */
} /* End if (xSecretColumn) */
/* Perform same process on a secret door that may be moving in the Y */
/* direction. The same door can move either way, depending on which */
/* angle the player struck it at. */
if (ySecretColumn)
{
if (ySecretColumn > 0)
{
mPos = ySecretmPos1;
DeltaGrid = -GRID_WIDTH;
ySecretColumn += DoorSpeed;
}
else
{
mPos = ySecretmPos;
DeltaGrid = 0;
ySecretColumn -= DoorSpeed;
}
my = mPos & 0xFFC0;
mx = (mPos - my) << 6;
if (abs(ySecretColumn) > GRID_SIZE)
{
my += ySecretColumn;
my = (my & 0xFFC0) + (mx >> 6);
if (yGrid[my])
{
yGrid[ySecretmPos] = 0;
yGrid[ySecretmPos1] = 0;
my += DeltaGrid;
xGrid[my] = NonSecretCode;
xGrid[my+1] = NonSecretCode;
yGrid[my] = NonSecretCode;
yGrid[my + GRID_WIDTH] = NonSecretCode;
ySecretColumn = 0;
}
else
{
if (my != mPos)
{
yGrid[ySecretmPos] = 0;
yGrid[ySecretmPos1] = 0;
if (ySecretColumn > 0)
{
ySecretColumn -= 63;
yGrid[my] = DOOR_SECRETCODE;
ySecretmPos1 = my;
my -= GRID_WIDTH;
yGrid[my] = DOOR_SECRETCODE;
ySecretmPos = my;
}
else
{
ySecretColumn += 63;
yGrid[my] = DOOR_SECRETCODE;
yGrid[my+GRID_WIDTH] = DOOR_SECRETCODE;
ySecretmPos = my;
ySecretmPos = my+GRID_WIDTH;
}
}
}
}
}
}