diff options
Diffstat (limited to 'city/geometry.lua')
| -rw-r--r-- | city/geometry.lua | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/city/geometry.lua b/city/geometry.lua index 5893731..a24e508 100644 --- a/city/geometry.lua +++ b/city/geometry.lua @@ -62,15 +62,27 @@ geom.square = class{ return false end, + -- check if the square intersects the given square + intersects = function(self, square) + local overlap = function(a, b) + return math.max(a.min, b.min) < math.min(a.max, b.max) + end + local x_overlap = overlap(self.x, square.x) + local y_overlap = overlap(self.y, square.y) + + if x_overlap and y_overlap then return true end + return false + end, + -- return an array of four squares covering the same -- area as their parent divide = function(self) local this = getmetatable(self).__index - + local x = self.center.x local y = self.center.y local d = self.span / 4 - + return { this(geom.point(x-d, y-d), d*2), this(geom.point(x+d, y-d), d*2), @@ -105,7 +117,7 @@ geom.qt_node = class{ -- point isn't even in this region return false end - + if self:is_leaf() and not self.point then -- no preexisting point, just store it self.point = point |