SBSPSS/source/enemy/npcpath.cpp

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/*=========================================================================
npcpath.cpp
Author: CRB
Created:
Project: Spongebob
Purpose:
Copyright (c) 2000 Climax Development Ltd
===========================================================================*/
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#ifndef __ENEMY_NPCPATH_H__
#include "enemy\npcpath.h"
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#endif
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bool CNpcWaypoint::isPointNear( DVECTOR testPos, s32 *xDist, s32 *yDist )
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{
s32 xDistSqr, yDistSqr;
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*xDist = this->pos.vx - testPos.vx;
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xDistSqr = (*xDist) * (*xDist);
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*yDist = this->pos.vy - testPos.vy;
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yDistSqr = (*yDist) * (*yDist);
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if ( xDistSqr + yDistSqr < 100 )
{
return( true );
}
else
{
return( false );
}
}
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void CNpcPath::initPath()
{
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waypoint = NULL;
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pathType = SINGLE_USE_PATH;
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currentWaypoint = NULL;
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lastWaypoint = NULL;
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waypointCount = 0;
reversePath = false;
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minX = maxX = minY = maxY = 0;
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}
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void CNpcPath::resetPath()
{
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currentWaypoint = waypoint;
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lastWaypoint = NULL;
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}
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void CNpcPath::addWaypoint( DVECTOR newPos )
{
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CNpcWaypoint *testWaypoint;
CNpcWaypoint *newWaypoint;
testWaypoint = this->waypoint;
if ( testWaypoint )
{
// find end of path
while ( testWaypoint->nextWaypoint )
{
testWaypoint = testWaypoint->nextWaypoint;
}
newWaypoint = new( "waypoint" ) CNpcWaypoint;
newWaypoint->pos = newPos;
newWaypoint->nextWaypoint = NULL;
newWaypoint->prevWaypoint = testWaypoint;
testWaypoint->nextWaypoint = newWaypoint;
waypointCount++;
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if ( newPos.vx < minX )
{
minX = newPos.vx;
}
else if ( newPos.vx > maxX )
{
maxX = newPos.vx;
}
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if ( newPos.vy < minY )
{
minY = newPos.vy;
}
else if ( newPos.vy > maxY )
{
maxY = newPos.vy;
}
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}
else
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{
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// no waypoints exist in this path, create
newWaypoint = new( "waypoint" ) CNpcWaypoint;
newWaypoint->pos = newPos;
newWaypoint->nextWaypoint = NULL;
newWaypoint->prevWaypoint = NULL;
this->waypoint = newWaypoint;
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waypointCount++;
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currentWaypoint = this->waypoint;
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minX = maxX = minY = maxY = newPos.vx;
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}
}
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void CNpcPath::getPathXExtents( s32 *minExtent, s32 *maxExtent )
{
*minExtent = minX;
*maxExtent = maxX;
}
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void CNpcPath::getPathYExtents( s32 *minExtent, s32 *maxExtent )
{
*minExtent = minY;
*maxExtent = maxY;
}
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void CNpcPath::removeAllWaypoints()
{
CNpcWaypoint *testWaypoint;
CNpcWaypoint *lastWaypoint;
testWaypoint = this->waypoint;
while ( testWaypoint )
{
lastWaypoint = testWaypoint;
testWaypoint = testWaypoint->nextWaypoint;
delete lastWaypoint;
}
this->waypoint = NULL;
}
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void CNpcPath::setPathType( u8 newPathType )
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{
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pathType = (NPC_PATH_TYPE) newPathType;
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}
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u8 CNpcPath::getPathType()
{
return( pathType );
}
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bool CNpcPath::incPath()
{
if ( !reversePath )
{
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if ( currentWaypoint->nextWaypoint )
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{
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lastWaypoint = currentWaypoint;
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currentWaypoint = currentWaypoint->nextWaypoint;
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}
else
{
switch( pathType )
{
case SINGLE_USE_PATH:
// path is completed
return( true );
case REPEATING_PATH:
// go back to start
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lastWaypoint = currentWaypoint;
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currentWaypoint = this->waypoint;
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break;
case PONG_PATH:
// reverse path
reversePath = !reversePath;
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if ( currentWaypoint->prevWaypoint )
{
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lastWaypoint = currentWaypoint;
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currentWaypoint = currentWaypoint->prevWaypoint;
}
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break;
}
}
}
else
{
// must be pong path if reversed
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if ( currentWaypoint->prevWaypoint )
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{
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lastWaypoint = currentWaypoint;
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currentWaypoint = currentWaypoint->prevWaypoint;
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}
else
{
reversePath = !reversePath;
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if ( currentWaypoint->nextWaypoint )
{
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lastWaypoint = currentWaypoint;
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currentWaypoint = currentWaypoint->nextWaypoint;
}
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}
}
return( false );
}
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void CNpcPath::reversePathDir()
{
if ( lastWaypoint )
{
CNpcWaypoint *tempWaypoint;
tempWaypoint = currentWaypoint;
currentWaypoint = lastWaypoint;
lastWaypoint = tempWaypoint;
if ( pathType == PONG_PATH )
{
reversePath = !reversePath;
}
}
}
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bool CNpcPath::getDistToNextWaypoint( DVECTOR currentPos, s32 *distX, s32 *distY )
{
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return( currentWaypoint->isPointNear( currentPos, distX, distY ) );
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}
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s32 CNpcPath::think( DVECTOR currentPos, bool *pathComplete, bool *waypointChange )
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{
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if ( !this->waypoint )
{
return( 0 );
}
if ( !currentWaypoint )
{
// if no currentWaypoint set, start it off
currentWaypoint = this->waypoint;
}
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s32 xDist, yDist;
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*pathComplete = false;
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*waypointChange = false;
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if ( currentWaypoint->isPointNear( currentPos, &xDist, &yDist ) )
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{
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*pathComplete = incPath();
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*waypointChange = true;
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xDist = currentWaypoint->pos.vx - currentPos.vx;
yDist = currentWaypoint->pos.vy - currentPos.vy;
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}
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s32 headingToTarget = ratan2( yDist, xDist );
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return( headingToTarget );
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}
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bool CNpcPath::thinkFlat( DVECTOR currentPos, bool *pathComplete, s32 *distX, s32 *distY, s32 *heading )
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{
bool pointChange = false;
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*pathComplete = false;
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if ( !this->waypoint )
{
return( true );
}
if ( !currentWaypoint )
{
// if no currentWaypoint set, start it off
currentWaypoint = this->waypoint;
}
*distX = currentWaypoint->pos.vx - currentPos.vx;
*distY = currentWaypoint->pos.vy - currentPos.vy;
if ( abs( *distX ) < 10 )
{
pointChange = true;
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*pathComplete = incPath();
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}
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*distX = currentWaypoint->pos.vx - currentPos.vx;
*distY = currentWaypoint->pos.vy - currentPos.vy;
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if ( *distX > 0 )
{
*heading = 0;
}
else
{
*heading = 2048;
}
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return( pointChange );
}
bool CNpcPath::thinkVertical( DVECTOR currentPos, bool *pathComplete, s32 *distX, s32 *distY, s32 *heading )
{
bool pointChange = false;
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*pathComplete = false;
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if ( !this->waypoint )
{
return( true );
}
if ( !currentWaypoint )
{
// if no currentWaypoint set, start it off
currentWaypoint = this->waypoint;
}
*distX = currentWaypoint->pos.vx - currentPos.vx;
*distY = currentWaypoint->pos.vy - currentPos.vy;
if ( abs( *distY ) < 10 )
{
pointChange = true;
*pathComplete = incPath();
}
*distX = currentWaypoint->pos.vx - currentPos.vx;
*distY = currentWaypoint->pos.vy - currentPos.vy;
if ( *distY > 0 )
{
*heading = 1024;
}
else
{
*heading = 3072;
}
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return( pointChange );
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}
CNpcWaypoint *CNpcPath::getWaypointList()
{
return( waypoint );
}