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-rw-r--r--src/core-units/affine.lisp71
1 files changed, 71 insertions, 0 deletions
diff --git a/src/core-units/affine.lisp b/src/core-units/affine.lisp
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+++ b/src/core-units/affine.lisp
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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-slots (scale-x scale-y) affine
+ (setf scale-x (* amount scale-x)
+ scale-y (* amount scale-y))))
+
+(defun set-width-preserve-aspect (affine new-width)
+ (scale-by affine (/ new-width (unit-width affine))))
+
+(defun set-height-preserve-aspect (affine new-height)
+ (scale-by affine (/ new-height (unit-height affine) )))
+
+(defmethod unit-width ((affine affine))
+ (with-slots (scale-x base-width) affine
+ (* scale-x base-width)))
+
+(defmethod unit-height ((affine affine))
+ (with-slots (scale-y base-height) affine
+ (* scale-y base-height)))
+
+(defmethod (setf unit-width) (newval (affine affine))
+ (with-slots (scale-x base-width) affine
+ (setf scale-x (coerce (/ newval base-width) 'single-float))))
+
+(defmethod (setf unit-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))))))