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中流砥柱
(defun midp3 ( pt1 pt2 / ) (list (/ (+ (car pt1) (car pt2)) 2.0) (/ (+ (cadr pt1) (cadr pt2)) 2.0) (/ (+ (caddr pt1) (caddr pt2)) 2.0) ))
Benchmarking ..................Elapsed milliseconds / relative speed for 32768 iteration(s): (MIDP3 P1 P2)......1045 / 10.21 <fastest> (MIDP1 P1 P2)......1185 / 9 (MIDP2 P1 P2)......1248 / 8.55 (MIDPT P1 P2).....10670 / 1 <slowest>
Benchmarking ..................Elapsed milliseconds / relative speed for 32768 iteration(s): (MIDP3 P1 P2).....1029 / 1.2 <fastest> (MIDP1 P1 P2).....1201 / 1.03 (MIDP2 P1 P2).....1232 / 1 <slowest>
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初露锋芒
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(command "_LINE" "_MID" pt1 "_MID" pt3 "")
(command "_LINE" (osnap pt1 "_MID") (osnap pt3 "_MID") "")
(command "_LINE" "_M2P" pt1 pt2 "_M2P" pt3 pt4 "")
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(defun midp4 (pt1 pt2 / z1 z2) (append (list (/ (+ (car pt1) (car pt2)) 2.0) (/ (+ (cadr pt1) (cadr pt2)) 2.0)) (if (and (setq z1 (caddr pt1)) (setq z2 (caddr pt2))) (list (/ (+ z1 z2) 2.0)))))
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