box.py

import itertools

class BoundingBox (object):

    def __init__(self, origin=(0, 0, 0), size=(0, 0, 0)):
        if isinstance(origin, BoundingBox):
            self._origin = list(origin._origin)
            self._size = list(origin._size)
        else:
            self._origin, self._size = list(map(int, origin)), list(map(int, size))

    def getMinx(self): return self.origin[0];
    def getMiny(self): return self.origin[1];
    def getMinz(self): return self.origin[2];

    def getMaxx(self): return self.origin[0] + self.size[0];
    def getMaxy(self): return self.origin[1] + self.size[1];
    def getMaxz(self): return self.origin[2] + self.size[2];

    def setMinx(self, x):
        self.size[0] -= x - self.origin[0]
        self.origin[0] = x;

    def setMiny(self, y):
        self.size[1] -= y - self.origin[1]
        self.origin[1] = y

    def setMinz(self, z):
        self.size[2] -= z - self.origin[2]
        self.origin[2] = z


    def setMaxx(self, x):
        if x < self.origin[0]:
            x = self.origin[0];

        self.size[0] = x - self.origin[0]

    def setMaxy(self, y):
        if y < self.origin[1]:
            y = self.origin[1];

        self.size[1] = y - self.origin[1]

    def setMaxz(self, z):
        if z < self.origin[2]:
            z = self.origin[2];

        self.size[2] = z - self.origin[2]


    minx = property(getMinx, setMinx);
    miny = property(getMiny, setMiny);
    minz = property(getMinz, setMinz);

    maxx = property(getMaxx, setMaxx);
    maxy = property(getMaxy, setMaxy);
    maxz = property(getMaxz, setMaxz);

    def getMincx(self): return self.origin[0] >> 4;
    def getMincz(self): return self.origin[2] >> 4;

    def getMaxcx(self): return ((self.origin[0] + self.size[0] - 1) >> 4) + 1;
    def getMaxcz(self): return ((self.origin[2] + self.size[2] - 1) >> 4) + 1;

    mincx = property(getMincx, None, None, "The smallest chunk position contained in this box");
    mincz = property(getMincz, None, None, "The smallest chunk position contained in this box");

    maxcx = property(getMaxcx, None, None, "The largest chunk position contained in this box");
    maxcz = property(getMaxcz, None, None, "The largest chunk position contained in this box");

    def getOrigin(self): return self._origin;
    def setOrigin(self, o): self._origin = list(o);

    def getSize(self): return self._size;
    def setSize(self, s): self._size = list(s);

    origin = property(getOrigin, setOrigin)
    size = property(getSize, setSize)

    def getWidth(self): return self._size[0];
    def getHeight(self): return self._size[1];
    def getLength(self): return self._size[2];

    def setWidth(self, w): self.size[0] = max(0, int(w))
    def setHeight(self, h): self.size[1] = max(0, int(h))
    def setLength(self, l): self.size[2] = max(0, int(l))

    width = property(getWidth, setWidth, None, "The dimension along the X axis");
    height = property(getHeight, setHeight, None, "The dimension along the Y axis");
    length = property(getLength, setLength, None, "The dimension along the Z axis");


    def getMaximum(self): return map(lambda a, b:a + b, self._origin, self._size)

    maximum = property(getMaximum, None, None, "The endpoint of the box; origin plus size.")

    def getVolume(self): return reduce(lambda a, b:a * b, self.size)
    volume = property(getVolume, None, None, "The volume of the box in blocks")

    @property
    def chunkPositions(self):
        #iterate through all of the chunk positions within this selection box
        return itertools.product(xrange(self.mincx, self.maxcx), xrange(self.mincz, self.maxcz));
    @property
    def chunkCount(self):
        return (self.maxcx - self.mincx) * (self.maxcz - self.mincz)


    @property
    def isChunkAligned(self):
        return (self.origin[0] & 0xf == 0) and (self.origin[2] & 0xf == 0)

    def intersect(self, box):
        """ return a box containing the area self and box have in common"""
        newbox = BoundingBox()

        if self.minx > box.maxx or self.maxx < box.minx: return BoundingBox()
        newbox.minx = max(self.minx, box.minx)
        newbox.maxx = min(self.maxx, box.maxx)

        if self.miny > box.maxy or self.maxy < box.miny: return BoundingBox()
        newbox.miny = max(self.miny, box.miny)
        newbox.maxy = min(self.maxy, box.maxy)
        if self.minz > box.maxz or self.maxz < box.minz: return BoundingBox()
        newbox.minz = max(self.minz, box.minz)
        newbox.maxz = min(self.maxz, box.maxz)



        #print "Intersect of {0} and {1}: {2}".format(self, box, newbox)
        return newbox

    def union(self, box):
        newbox = BoundingBox()
        newbox.minx = min(self.minx, box.minx)
        newbox.maxx = max(self.maxx, box.maxx)

        newbox.miny = min(self.miny, box.miny)
        newbox.maxy = max(self.maxy, box.maxy)
        newbox.minz = min(self.minz, box.minz)
        newbox.maxz = max(self.maxz, box.maxz)
        return newbox

    def expand(self, dx, dy=None, dz=None):
        if dz is None: dz = dx
        if dy is None: dy = dx

        box = BoundingBox(self)
        box.minx -= dx
        box.miny -= dy
        box.minz -= dz

        box.maxx += dx
        box.maxy += dy
        box.maxz += dz
        return box


    def __contains__(self, pos):
        x, y, z = pos;
        if x < self.minx or x >= self.maxx: return False
        if y < self.miny or y >= self.maxy: return False
        if z < self.minz or z >= self.maxz: return False

        return True;

    def __cmp__(self, b):
        return cmp((self.origin, self.size), (b.origin, b.size))

    def __repr__(self):
        return "BoundingBox({0}, {1})".format(self.origin, self.size)