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;;;; affine.lisp
(in-package #:wheelwork)
(defclass/std affine (unit)
((cached-model cached-projected-matrix cached-application :a)
(base-width base-height :r :std 1.0 :doc "Determined by content.")
(scale-x scale-y :std 1.0)
(rotation x y :std 0.0)))
(defmethod (setf closer-mop:slot-value-using-class) :after
(newval class (affine affine) slot)
(case (closer-mop:slot-definition-name slot)
((x y scale-x scale-y rotation)
(setf (cached-model affine) nil
(cached-projected-matrix affine) nil))))
(defun scale-by (affine amount)
(with-accessors ((sx scale-x) (sy scale-y)) affine
(setf sx (* amount sx)
sy (* amount sy))))
(defun set-width-preserve-aspect (affine new-width)
(scale-by affine (/ new-width (width affine))))
(defun set-height-preserve-aspect (affine new-height)
(scale-by affine (/ new-height (height affine) )))
(defmethod width ((affine affine))
(with-slots (scale-x base-width) affine
(* scale-x base-width)))
(defmethod height ((affine affine))
(with-slots (scale-y base-height) affine
(* scale-y base-height)))
(defmethod (setf width) (newval (affine affine))
(with-slots (scale-x base-width) affine
(setf scale-x (coerce (/ newval base-width) 'single-float))))
(defmethod (setf height) (newval (affine affine))
(with-slots (scale-y base-height) affine
(setf scale-y (coerce (/ newval base-height) 'single-float))))
(defmethod model-matrix :around ((u affine))
(or (cached-model u)
(setf (cached-model u)
(call-next-method))))
(defmethod model-matrix ((u affine))
(let ((m (mat:meye 4)))
(with-slots (x y base-width scale-x base-height scale-y rotation) u
(let ((uw (* base-width scale-x))
(uh (* base-height scale-y)))
(mat:nmtranslate m (vec:vec x y 0.0))
(mat:nmtranslate m (vec:v* 0.5 (vec:vec uw uh 0.0)))
(mat:nmrotate m vec:+vz+ rotation)
(mat:nmtranslate m (vec:v* -0.5 (vec:vec uw uh 0.0)))
(mat:nmscale m (vec:vec uw uh 1.0))))
m))
(defun projected-matrix (affine)
(or (cached-projected-matrix affine)
(setf (cached-projected-matrix affine)
(mat:marr (mat:m* (application-projection (app-of-unit affine))
(model-matrix affine))))))
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