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;;;; imbricate.lisp
(defpackage #:imbricate
(:use #:cl)
(:import-from #:opticl
#:convert-image-to-rgba
#:read-png-file
#:with-image-bounds)
(:import-from #:alexandria #:when-let #:if-let)
(:import-from #:defclass-std #:defclass/std))
(in-package #:imbricate)
(defclass rect ()
((x :accessor rect-x
:initarg :x
:initform 0
:type fixnum)
(y :accessor rect-y
:initarg :y
:initform 0
:type fixnum)
(width :accessor rect-width
:initarg :width
:initform 0
:type fixnum)
(height :accessor rect-height
:initarg :height
:initform 0
:type fixnum)))
(defun rect-area (r)
(* (rect-width r) (rect-height r)))
(defun contains-point-p (r px py)
(with-slots (x y width height) r
(and (<= x px (1- (+ x width)))
(<= y py (1- (+ y height))))))
(defun top-left (rect)
(with-slots (x y) rect
(cons x y)))
(defun top-right (rect)
(with-slots (x y width) rect
(cons (1- (+ x width))
y)))
(defun bottom-left (rect)
(with-slots (x y width height) rect
(cons (1- (+ x width))
(1- (+ y height)))))
(defun bottom-right (rect)
(with-slots (x y height) rect
(cons x
(1- (+ y height)))))
(defun translate-pt (pt dx dy)
(cons (+ dx (car pt))
(+ dy (cdr pt))))
(defun left-most (rect) (rect-x rect))
(defun right-most (rect) (1- (+ (rect-x rect) (rect-width rect))))
(defun bottom-most (rect) (1- (+ (rect-y rect) (rect-height rect))))
(defun top-most (rect ) (rect-y rect))
(defun corners (rect)
(list (top-left rect)
(top-right rect)
(bottom-right rect)
(bottom-left rect)))
(defun intersects-p (r1 r2)
(loop :for (x . y) :in (corners r2)
:when (contains-point-p r1 x y)
:do (return-from intersects-p t)))
(defclass tile (rect)
((path :accessor tile-path
:initarg :path
:initform (error "must supply path"))
(data :accessor tile-data
:initarg :data
:initform (error "Must supply data"))))
(defmethod print-object ((ob tile) stream)
(with-slots (x y width height path) ob
(format stream "#<tile: ~a~% dimensions: ~ax~a~% at: ~a,~a>"
path width height x y)))
(defclass sheet-plan (rect)
((candidates :accessor candidates
:initform nil)
(positioned :accessor positioned
:initform nil)))
(defun validly-positioned-p (plan tile)
(and (contains-point-p plan (right-most tile) (bottom-most tile))
(not (some (lambda (other) (intersects-p tile other)) (positioned plan)))))
(defun position-tile (plan tile)
"finds a place for the tile in the tilesheet under construction and
places the tile into the 'positioned' list of the corner plan
instance. "
(loop :for (x . y) :in (candidates plan)
:do (setf (rect-x tile) x
(rect-y tile) y)
:until (validly-positioned-p plan tile))
;; if no position was found, set a position based
;; on the current size of the tilesheet
(unless (validly-positioned-p plan tile)
(with-slots (width height) plan
(if (< width height)
(setf (rect-x tile) width
(rect-y tile) 0)
(setf (rect-x tile) 0
(rect-y tile) height))))
;; update width and height of the sheet
(setf (rect-width plan) (max (rect-width plan)
(1+ (right-most tile)))
(rect-height plan) (max (rect-height plan)
(1+ (bottom-most tile))))
;; update the corner plan
(push tile (positioned plan))
(setf (candidates plan)
(delete (top-left tile)
(candidates plan)
:test #'equal))
(pushnew (translate-pt (top-right tile) 1 0) (candidates plan)
:test #'equal)
(pushnew (translate-pt (bottom-left tile) 0 1) (candidates plan)
:test #'equal))
(defun position-tiles (tiles)
(let ((plan (make-instance 'sheet-plan))
(tiles (sort tiles #'> :key #'rect-area)))
(dolist (tile tiles plan)
(position-tile plan tile))))
(defun render-sheet (plan)
(let ((sheet (opticl:make-8-bit-rgba-image (rect-width plan) (rect-height plan))))
(dolist (tile (positioned plan))
(with-slots (x y width height data) tile
(dotimes (px width)
(dotimes (py height)
(setf (opticl:pixel sheet (+ x px) (+ y py) )
(opticl:pixel data px py ))))))
sheet))
(defun load-tile (path)
(let ((data
(convert-image-to-rgba
(read-png-file path))))
(with-image-bounds (w h) data
(make-instance 'tile
:path path
:data data
:width w
:height h))))
(defun png-file-p (path)
(declare (type pathname path))
(string-equal "png" (pathname-type path)))
(defvar *bad-images* nil)
(defun images-under-dir (dir)
(let ((images '())
(*bad-images* nil))
(uiop:collect-sub*directories
dir
(constantly t)
(constantly t)
(lambda (subdir)
(dolist (file (uiop:directory-files subdir))
(when (png-file-p file)
(handler-case
(push (load-tile file) images)
(error (e)
(declare (ignore e))
(push file *bad-images*)))))))
images))
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