T{ quadtree f T{ rect f { 0.0 -1.0 } { 1.0 1.0 } } { 0.0 -0.25 } "a" f f f f t }
T{ quadtree f T{ rect f { -1.0 0.0 } { 1.0 1.0 } } f f f f f f t }
T{ quadtree f T{ rect f { 0.0 0.0 } { 1.0 1.0 } } { 0.25 0.25 } "b" f f f f t }
- f
+ f
} ] [
unit-bounds <quadtree>
"a" { 0.0 -0.25 } value>>key