/// <summary>
/// Selects the south-western voxel of the point selected by the mouse.
/// The loc parameter and the ab parameter should point to the same location.
/// </summary>
private Location selectVoxel(MapViewWindow view, Location loc, Point ab)
{
// top-left corner of the selected location
Point vxl = World.world.fromXYZToAB(loc);
Point offset = new Point(ab.X - vxl.X, ab.Y - vxl.Y);
if (offset.X < 8)
{
loc.x--;
}
else
if (offset.X >= 24)
{
loc.y++;
}
else
{
MountainVoxel mv = MountainVoxel.get(loc);
int h0 = (mv != null)?(int)mv.getHeight(Direction.NORTHEAST):0;
int h2 = (mv != null)?(int)mv.getHeight(Direction.SOUTHWEST):0;
if (offset.Y >= (16 - (h0 + h2) * 4) / 2)
{
loc.x--; loc.y++;
}
}
return(loc);
}
private int getHeight(Location loc, Direction d)
{
MountainVoxel mv = MountainVoxel.get(loc);
if (mv != null)
{
return(mv.getHeight(d) + loc.z * 4);
}
else
{
return(loc.z * 4);
}
}
/// <summary>
/// Lowers the north-eastern corner of the specified voxel.
/// </summary>
/// <returns>false if the operation was unsuccessful.</returns>
private bool lower(Location loc)
{
World world = World.world;
if (!canBeLowered(ref loc))
{
return(false);
}
// then actually change the terrain
for (int x = 0; x <= 1; x++)
{
for (int y = -1; y <= 0; y++)
{
Location l = new Location(loc.x + x, loc.y + y, loc.z);
Direction d = Direction.get(1 - x * 2, -y * 2 - 1); // corner to modify
MountainVoxel mv = MountainVoxel.get(l);
if (mv == null)
{
World.world.lowerGround(l);
mv = new MountainVoxel(l, 4, 4, 4, 4);
}
mv.setHeight(d, mv.getHeight(d) - 1);
if (mv.isFlattened) // completely flattened
{
world.remove(mv);
}
}
}
return(true);
}
// clean it up by using MountainVoxel.isCornerMatched
private bool canBeLowered(ref Location loc)
{
World world = World.world;
if (!isFourAdjacentCornersMatched(loc))
{
return(false);
}
MountainVoxel mvBase = MountainVoxel.get(loc);
if (mvBase != null)
{
if (mvBase.getHeight(Direction.NORTHEAST) == 0)
{
return(false); // other corners need to be lowered first.
}
}
else
{
int glevel = world.getGroundLevel(loc);
if (glevel != loc.z && glevel != loc.z - 1)
{
return(false);
}
if (loc.z == 0)
{
return(false); // can't dig deeper
}
loc.z--;
}
// check other voxels
for (int x = 0; x <= 1; x++)
{
for (int y = -1; y <= 0; y++)
{
Location l = new Location(loc.x + x, loc.y + y, loc.z);
if (MountainVoxel.get(l) != null)
{
continue; // if it's mountain, OK.
}
// otherwise, make sure that nothing is on it.
if (World.world[l.x, l.y, l.z + 1] != null)
{
return(false);
}
// and nothing is under it
if (World.world[l.x, l.y, l.z] != null)
{
return(false);
}
}
}
if (World.world.isOutsideWorld(loc))
{
return(false);
}
return(true);
}