AutoCAD 2012 帮助 |  |
AutoCAD 2012 帮助 | |
Returns the second derivative (in WCS) of a curve at the specified location
(vlax-curve-getSecondDeriv curve-obj param)
A 3D vector list, if successful; otherwise nil.
For the following example, assume that splineObj points to the spline shown in the example of the vlax-curve-getDistAtParam function.
Obtain the start parameter of the curve:
_$ (setq startSpline (vlax-curve-getStartParam splineObj))
0.0
Obtain the end parameter of the curve:
_$ (setq endSpline (vlax-curve-getEndParam splineObj))
17.1546
Determine the second derivative at the parameter midway along the curve:
_$ (vlax-curve-getSecondDeriv splineObj
( / (- endspline startspline) 2))
(0.0165967 0.150848 0.0)
| V Functions |  | |
| vector_image | ||
| ver | ||
| vl-acad-defun | ||
| vl-acad-undefun | ||
| vl-arx-import | ||
| vl-bb-ref | ||
| vl-bb-set | ||
| vl-catch-all-apply | ||
| vl-catch-all-error-message | ||
| vl-catch-all-error-p | ||
| vl-cmdf | ||
| vl-consp | ||
| vl-directory-files | ||
| vl-doc-export | ||
| vl-doc-import | ||
| vl-doc-ref | ||
| vl-doc-set | ||
| vl-every | ||
| vl-exit-with-error | ||
| vl-exit-with-value | ||
| vl-file-copy | ||
| vl-file-delete | ||
| vl-file-directory-p | ||
| vl-file-rename | ||
| vl-file-size | ||
| vl-file-systime | ||
| vl-filename-base | ||
| vl-filename-directory | ||
| vl-filename-extension | ||
| vl-filename-mktemp | ||
| vl-get-resource | ||
| vl-list* | ||
| vl-list->string | ||
| vl-list-exported-functions | ||
| vl-list-length | ||
| vl-list-loaded-vlx | ||
| vl-load-all | ||
| vl-load-com | ||
| vl-load-reactors | ||
| vl-mkdir | ||
| vl-member-if | ||
| vl-member-if-not | ||
| vl-position | ||
| vl-prin1-to-string | ||
| vl-princ-to-string | ||
| vl-propagate | ||
| vl-registry-delete | ||
| vl-registry-descendents | ||
| vl-registry-read | ||
| vl-registry-write | ||
| vl-remove | ||
| vl-remove-if | ||
| vl-remove-if-not | ||
| vl-some | ||
| vl-sort | ||
| vl-sort-i | ||
| vl-string->list | ||
| vl-string-elt | ||
| vl-string-left-trim | ||
| vl-string-mismatch | ||
| vl-string-position | ||
| vl-string-right-trim | ||
| vl-string-search | ||
| vl-string-subst | ||
| vl-string-translate | ||
| vl-string-trim | ||
| vl-symbol-name | ||
| vl-symbol-value | ||
| vl-symbolp | ||
| vl-unload-vlx | ||
| vl-vbaload | ||
| vl-vbarun | ||
| vl-vlx-loaded-p | ||
| vlax-3D-point | ||
| vlax-add-cmd | ||
| vlax-create-object | ||
| vlax-curve-getArea | ||
| vlax-curve-getClosestPointTo | ||
| vlax-curve-getClosestPointToProjection | ||
| vlax-curve-getDistAtParam | ||
| vlax-curve-getDistAtPoint | ||
| vlax-curve-getEndParam | ||
| vlax-curve-getEndPoint | ||
| vlax-curve-getFirstDeriv | ||
| vlax-curve-getParamAtDist | ||
| vlax-curve-getParamAtPoint | ||
| vlax-curve-getPointAtDist | ||
| vlax-curve-getPointAtParam | ||
| vlax-curve-getSecondDeriv | ||
| vlax-curve-getStartParam | ||
| vlax-curve-getStartPoint | ||
| vlax-curve-isClosed | ||
| vlax-curve-isPeriodic | ||
| vlax-curve-isPlanar | ||
| vlax-dump-object | ||
| vlax-ename->vla-object | ||
| vlax-erased-p | ||
| vlax-for | ||
| vlax-get-acad-object | ||
| vlax-get-object | ||
| vlax-get-or-create-object | ||
| vlax-get-property | ||
| vlax-import-type-library | ||
| vlax-invoke-method | ||
| vlax-ldata-delete | ||
| vlax-ldata-get | ||
| vlax-ldata-list | ||
| vlax-ldata-put | ||
| vlax-ldata-test | ||
| vlax-make-safearray | ||
| vlax-make-variant | ||
| vlax-map-collection | ||
| vlax-method-applicable-p | ||
| vlax-object-released-p | ||
| vlax-product-key | ||
| vlax-property-available-p | ||
| vlax-put-property | ||
| vlax-read-enabled-p | ||
| vlax-release-object | ||
| vlax-remove-cmd | ||
| vlax-safearray-fill | ||
| vlax-safearray-get-dim | ||
| vlax-safearray-get-element | ||
| vlax-safearray-get-l-bound | ||
| vlax-safearray-get-u-bound | ||
| vlax-safearray-put-element | ||
| vlax-safearray-type | ||
| vlax-safearray->list | ||
| vlax-tmatrix | ||
| vlax-typeinfo-available-p | ||
| vlax-variant-change-type | ||
| vlax-variant-type | ||
| vlax-variant-value | ||
| vlax-vla-object->ename | ||
| vlax-write-enabled-p | ||
| vlisp-compile | ||
| vlr-acdb-reactor | ||
| vlr-add | ||
| vlr-added-p | ||
| vlr-beep-reaction | ||
| vlr-command-reactor | ||
| vlr-current-reaction-name | ||
| vlr-data | ||
| vlr-data-set | ||
| vlr-deepclone-reactor | ||
| vlr-docmanager-reactor | ||
| vlr-dwg-reactor | ||
| vlr-dxf-reactor | ||
| vlr-editor-reactor | ||
| vlr-insert-reactor | ||
| vlr-linker-reactor | ||
| vlr-lisp-reactor | ||
| vlr-miscellaneous-reactor | ||
| vlr-mouse-reactor | ||
| vlr-notification | ||
| vlr-object-reactor | ||
| vlr-owner-add | ||
| vlr-owner-remove | ||
| vlr-owners | ||
| vlr-pers | ||
| vlr-pers-list | ||
| vlr-pers-p | ||
| vlr-pers-release | ||
| vlr-reaction-name | ||
| vlr-reaction-set | ||
| vlr-reactions | ||
| vlr-reactors | ||
| vlr-remove | ||
| vlr-remove-all | ||
| vlr-set-notification | ||
| vlr-sysvar-reactor | ||
| vlr-toolbar-reactor | ||
| vlr-trace-reaction | ||
| vlr-type | ||
| vlr-types | ||
| vlr-undo-reactor | ||
| vlr-wblock-reactor | ||
| vlr-window-reactor | ||
| vlr-xref-reactor | ||
| vports | ||
