near/heyarne.rect-packing
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Implement naive rect packing :)

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heyarne 2021-12-30 16:55:14 +01:00
commit 081809d4cd
1 changed files with 21 additions and 7 deletions
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28
src/heyarne/rect_packing/core.cljs
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@ -24,13 +24,27 @@
starting at the top left."
[frame rects]
(let [rects (sort-by (comp - geom/height) rects)]
(reduce (fn [result rect]
(let [last-placed (last result)]
(conj result (geom/translate rect [(if last-placed
(rect/right last-placed)
0)
0]))))
[] rects)))
(-> (reduce (fn [acc rect]
;; a word on "top" vs "bottom": the thi.ng coordinate system
;; works like the ones you know from scool, i.e. [0 1] is
;; above [0 0]. the svg coordinate system uses screen
;; coordinates, where [0 0] is at the top left. if you see
;; rect/bottom we're actually looking at the top edge that is
;; drawn in the svg.
(let [last-placed (or (last (:result acc)) (rect/rect 0 0))
moved-right (geom/translate rect [(rect/right last-placed) (rect/bottom (:row-start acc))])]
;; do we still have enough space to the right?
(if (<= (rect/right moved-right) (rect/right frame))
;; if yes, everything is bon
(update acc :result conj moved-right)
;; if no, move to the bottom
(let [moved-bottom (geom/translate rect [0 (rect/top (:row-start acc))])]
(-> (assoc acc :row-start moved-bottom)
(update :result conj moved-bottom))))))
{:row-start (first rects)
:result []}
rects)
:result)))
#_(pack-rects-naive (:frame @state) (:rects @state))