/************************************************************************************************
* CRMPathManager::GenerateRivers
* Creates a river which intersects the main path
*
* inputs:
* none
*
* return:
* none
*
************************************************************************************************/
void CRMPathManager::GenerateRivers ()
{
if (mRiverBedDepth == 1)
// no rivers
return;
mMaxDepth = mRiverDepth;
mDepth = 0;
int cell_x = 0;
int cell_y = 0;
// choose starting cell along an edge
int edge = TheRandomMissionManager->GetLandScape()->irand(0, 7);
switch ( edge )
{
case 0:
cell_x = mXNodes / 2; cell_y = 0;
break;
case 1:
cell_x = mXNodes; cell_y = 0;
break;
case 2:
cell_x = mXNodes; cell_y = mYNodes / 2;
break;
case 3:
cell_x = mXNodes; cell_y = mYNodes;
break;
case 4:
cell_x = mXNodes / 2; cell_y = mYNodes;
break;
case 5:
cell_x = 0; cell_y = mYNodes;
break;
case 6:
cell_x = 0; cell_y = mYNodes / 2;
break;
case 7:
cell_x = 0; cell_y = 0;
break;
}
ClearCells(mXNodes+1, mYNodes+1);
mRiverCount = mPathCount;
// visit the first cell
RiverVisit(cell_x,cell_y);
mRiverCount = mPathCount - mRiverCount;
return;
}
void CRMPathManager::RiverVisit(const int c_x, const int c_y)
{
// does this cell have any neighbors with all walls intact?
int i,off;
// look at neighbors in random order
off = TheRandomMissionManager->GetLandScape()->irand(DIR_FIRST, DIR_MAX-1);
++mDepth; // track our depth of recursion
for (i = DIR_FIRST; i<DIR_MAX && mDepth <= mMaxDepth; i+=2)
{
int d = (i + off) % DIR_MAX;
if ( !Cell(c_x, c_y).Border(d) )
{ // we can move this way, since no border
int new_c_x = c_x + neighbor_x[d];
int new_c_y = c_y + neighbor_y[d];
if (RiverCell(new_c_x,new_c_y).Wall() == DIR_ALL)
{ // we have a new cell that has not been visited!
int new_dir;
// d is the direction relative to the current cell
// new_dir is the direction relative to the next cell (N becomes S, NE becomes SW, etc...)
if( d < HALF_DIR_MAX )
{
new_dir = d + HALF_DIR_MAX;
}
else
{
new_dir = d - HALF_DIR_MAX;
}
// knock down walls
RiverCell(c_x,c_y).RemoveWall(d);
RiverCell(new_c_x,new_c_y).RemoveWall(new_dir); //DIR_MAX - d);
// create river between cells
mTerrain->CreatePath ( mPathCount++,
-1,
0,
mRiverPoints,
GetRiverPos(c_x,c_y)[0],
GetRiverPos(c_x,c_y)[1],
GetRiverPos(new_c_x,new_c_y)[0],
GetRiverPos(new_c_x,new_c_y)[1],
mRiverMinWidth,
mRiverMaxWidth,
mRiverBedDepth,
mRiverDeviation,
mRiverBreadth );
// flatten a small spot
CArea area;
float flat_radius = mRiverMinWidth *
fabs(TheRandomMissionManager->GetLandScape()->GetBounds()[1][0] - TheRandomMissionManager->GetLandScape()->GetBounds()[0][0]);
area.Init( GetRiverPos(c_x,c_y), flat_radius, 0.0f, AT_NONE, 0, 0 );
TheRandomMissionManager->GetLandScape()->FlattenArea (&area, 255 * mRiverBedDepth, false, true, true );
// recurse
RiverVisit(new_c_x, new_c_y);
}
}
}
// --mDepth;
}
