public HeightMap generate( HeightMap map )
{
this.Random = new NPack.MersenneTwister( map.seed );
Int32 pass = map.size;
Int32 x, y;
while( pass > 1 )
{
x = 0;
y = 0;
while( x < map.size )
{
while( y < map.size )
{
this.diamond( map, x, y, pass );
this.square( map, x, y, pass );
y += pass;
}
x += pass;
}
this.range /= this.levelDivisor;
pass >>= 1;
}
return map;
}
private void alterMidpoint( HeightMap map, Int32 x, Int32 y, Double[] points )
{
Double avg = 0;
Int32 t = 0;
foreach( Int32 i in points )
{
avg += points[i];
t = i;
}
if( t > 0 )
avg /= t;
avg += this.Random.NextDouble() * this.range;
map.setPoint( x, y, avg );
}
private void diamond( HeightMap map, Int32 x, Int32 y, Int32 pass )
{
Double[] points = new Double[]{};
Int32 i = 0;
// NW
points.SetValue(
map.getPoint( x, y ),
i
);
i++;
//NE
try
{
points.SetValue(
map.getPoint(
x + pass,
y
),
i
);
i++;
}
catch( IndexOutOfRangeException ) { }
//SW
try
{
points.SetValue(
map.getPoint(
x,
y + pass
),
i
);
i++;
}
catch( IndexOutOfRangeException ) { }
//SE
try
{
points.SetValue(
map.getPoint(
x + pass,
y + pass
),
i
);
i++;
}
catch( IndexOutOfRangeException ) { }
// Center
this.alterMidpoint(
map,
x + pass >> 1,
y + pass >> 1,
points
);
}