vlax-tmatrix
From AutoCad AutoLISP Functions
vlax-safearray->list
V Functions
vlax-typeinfo-available-p
Returns a suitable representation for a 4 x 4 transformation matrix to be used in VLA methods
(vlax-tmatrix list)
A variant of type safearray, representing the 4×4 transformation matrix.
Define a transformation matrix and assign its value to variable tmatrix:
_$ (setq tmatrix (vlax-tmatrix '((1 1 1 0) (1 2 3 0) (2 3 4 5) (2 9 8 3))))
#<variant 8197 ...>
Use vlax-safearray->list to view the value of tmatrix in list form:
_$ (vlax-safearray->list (vlax-variant-value tmatrix))
((1.0 1.0 1.0 0.0) (1.0 2.0 3.0 0.0) (2.0 3.0 4.0 5.0) (2.0 9.0 8.0 3.0))
The following code example creates a line and rotates it 90 degrees using a transformation matrix:
(defun Example_TransformBy () ; / lineObj startPt endPt matList transMat)
(vl-load-com) ; Load ActiveX support(setq acadObject (vlax-get-acad-object))(setq acadDocument (vla-get-ActiveDocument acadObject))(setq mSpace (vla-get-ModelSpace acadDocument));; Create a line(setq startPt (getpoint "Pick the start point"))(setq endPt (vlax-3d-point (getpoint startPt "Pick the end point")))(setq lineObj (vla-addline mSpace (vlax-3d-point startPt) endPt));;; Initialize the transMat variable with a transformation matrix;;; that will rotate an object by 90 degrees about the point(0,0,0).;;; Begin by Creating a list of four lists, each containing four;;; numbers, representing transformation matrix elements.(setq matList (list '(0 -1 0 0) '(1 0 0 0) '(0 0 1 0) '(0 0 0 1)));;; Use vlax-tmatrix to convert the list to a variant.(setq transmat (vlax-tmatrix matlist));;; Transform the line using the defined transformation matrix(vla-transformby lineObj transMat)(vla-zoomall acadObject)(princ "The line is transformed ")(princ))