ClassesClasses | | Operators

draw_nurbsT_draw_nurbsDrawNurbsDrawNurbs (Operator)

Name

draw_nurbsT_draw_nurbsDrawNurbsDrawNurbs — Interactive drawing of a NURBS curve.

Signature

draw_nurbs( : ContOut : WindowHandle, Rotate, Move, Scale, KeepRatio, Degree : Rows, Cols, Weights)

Herror T_draw_nurbs(Hobject* ContOut, const Htuple WindowHandle, const Htuple Rotate, const Htuple Move, const Htuple Scale, const Htuple KeepRatio, const Htuple Degree, Htuple* Rows, Htuple* Cols, Htuple* Weights)

void DrawNurbs(HObject* ContOut, const HTuple& WindowHandle, const HTuple& Rotate, const HTuple& Move, const HTuple& Scale, const HTuple& KeepRatio, const HTuple& Degree, HTuple* Rows, HTuple* Cols, HTuple* Weights)

void HXLDCont::DrawNurbs(const HWindow& WindowHandle, const HString& Rotate, const HString& Move, const HString& Scale, const HString& KeepRatio, Hlong Degree, HTuple* Rows, HTuple* Cols, HTuple* Weights)

void HXLDCont::DrawNurbs(const HWindow& WindowHandle, const char* Rotate, const char* Move, const char* Scale, const char* KeepRatio, Hlong Degree, HTuple* Rows, HTuple* Cols, HTuple* Weights)

HXLDCont HWindow::DrawNurbs(const HString& Rotate, const HString& Move, const HString& Scale, const HString& KeepRatio, Hlong Degree, HTuple* Rows, HTuple* Cols, HTuple* Weights) const

HXLDCont HWindow::DrawNurbs(const char* Rotate, const char* Move, const char* Scale, const char* KeepRatio, Hlong Degree, HTuple* Rows, HTuple* Cols, HTuple* Weights) const

static void HOperatorSet.DrawNurbs(out HObject contOut, HTuple windowHandle, HTuple rotate, HTuple move, HTuple scale, HTuple keepRatio, HTuple degree, out HTuple rows, out HTuple cols, out HTuple weights)

void HXLDCont.DrawNurbs(HWindow windowHandle, string rotate, string move, string scale, string keepRatio, int degree, out HTuple rows, out HTuple cols, out HTuple weights)

HXLDCont HWindow.DrawNurbs(string rotate, string move, string scale, string keepRatio, int degree, out HTuple rows, out HTuple cols, out HTuple weights)

Description

draw_nurbsdraw_nurbsDrawNurbsDrawNurbsDrawNurbs returns the contour ContOutContOutContOutContOutcontOut and control information (RowsRowsRowsRowsrows, ColsColsColsColscols, and WeightsWeightsWeightsWeightsweights) of a NURBS curve of degree DegreeDegreeDegreeDegreedegree, which has been created interactively by the user in the window WindowHandleWindowHandleWindowHandleWindowHandlewindowHandle. For additional information concerning NURBS curves, see the documentation of gen_contour_nurbs_xldgen_contour_nurbs_xldGenContourNurbsXldGenContourNurbsXldGenContourNurbsXld. To use the control information RowsRowsRowsRowsrows, ColsColsColsColscols, and WeightsWeightsWeightsWeightsweights in a subsequent call to the operator gen_contour_nurbs_xldgen_contour_nurbs_xldGenContourNurbsXldGenContourNurbsXldGenContourNurbsXld, the knot vector KnotsKnotsKnotsKnotsknots should be set to 'auto'"auto""auto""auto""auto".

The NURBS curve is created and manipulated by the means of its control polygon. By contrast, using the operator draw_nurbs_interpdraw_nurbs_interpDrawNurbsInterpDrawNurbsInterpDrawNurbsInterp, it is possible to create a NURBS curve that interpolates points specified by the user. Directly after calling draw_nurbsdraw_nurbsDrawNurbsDrawNurbsDrawNurbs, you can add control points by clicking with the left mouse button in the window at the desired positions.

When there are three control points or more, the first and the last point will be marked with an additional square. By clicking on them you can close the curve or open it again. You delete the point appended last by pressing the Ctrl key.

As soon as the number of control points exceeds DegreeDegreeDegreeDegreedegree, the NURBS curve given by the specified control polygon and weight vector is displayed in addition to the control polygon.

The control point which was handled last is surrounded by a circle representing its weight. By simply dragging the circle you can increase or decrease the weight of this control point.

Existing control points can be moved by dragging them with the mouse. Further new points on the control polygon (to refine the control polygon) can be inserted by a left click on the desired position on the control polygon.

By pressing the Shift key, you can switch into the transformation mode. In this mode you can rotate, move, and scale the contour as a whole, but only if you set the parameters RotateRotateRotateRotaterotate, MoveMoveMoveMovemove, and ScaleScaleScaleScalescale, respectively, to 'true'"true""true""true""true". Instead of the pick points and the control polygon, 3 symbols are displayed with the contour: a cross in the middle and an arrow to the right if RotateRotateRotateRotaterotate is set to 'true'"true""true""true""true", and a double-headed arrow to the upper right if ScaleScaleScaleScalescale is set to 'true'"true""true""true""true".

You can

By pressing the Shift key again you can switch back to the edit mode. Pressing the right mouse button terminates the procedure. On macOS draw_nurbsdraw_nurbsDrawNurbsDrawNurbsDrawNurbs can also be terminated by pressing the escape key.

The appearance of the curve while drawing is determined by the line width, size, and color set via the operators set_colorset_colorSetColorSetColorSetColor, set_coloredset_coloredSetColoredSetColoredSetColored, set_line_widthset_line_widthSetLineWidthSetLineWidthSetLineWidth, and set_line_styleset_line_styleSetLineStyleSetLineStyleSetLineStyle. The control polygon and all handles are displayed in the second color set by set_colorset_colorSetColorSetColorSetColor or set_coloredset_coloredSetColoredSetColoredSetColored. Their line width is fixed to 1 and their line style is fixed to a drawn-through line.

Execution Information

Parameters

ContOutContOutContOutContOutcontOut (output_object)  xld_cont objectHXLDContHXLDContHobject *

Contour approximating the NURBS curve.

WindowHandleWindowHandleWindowHandleWindowHandlewindowHandle (input_control)  window HWindow, HTupleHTupleHtuple (integer) (IntPtr) (Hlong) (Hlong)

Window handle.

RotateRotateRotateRotaterotate (input_control)  string HTupleHTupleHtuple (string) (string) (HString) (char*)

Enable rotation?

Default value: 'true' "true" "true" "true" "true"

List of values: 'false'"false""false""false""false", 'true'"true""true""true""true"

MoveMoveMoveMovemove (input_control)  string HTupleHTupleHtuple (string) (string) (HString) (char*)

Enable moving?

Default value: 'true' "true" "true" "true" "true"

List of values: 'false'"false""false""false""false", 'true'"true""true""true""true"

ScaleScaleScaleScalescale (input_control)  string HTupleHTupleHtuple (string) (string) (HString) (char*)

Enable scaling?

Default value: 'true' "true" "true" "true" "true"

List of values: 'false'"false""false""false""false", 'true'"true""true""true""true"

KeepRatioKeepRatioKeepRatioKeepRatiokeepRatio (input_control)  string HTupleHTupleHtuple (string) (string) (HString) (char*)

Keep ratio while scaling?

Default value: 'true' "true" "true" "true" "true"

List of values: 'false'"false""false""false""false", 'true'"true""true""true""true"

DegreeDegreeDegreeDegreedegree (input_control)  integer HTupleHTupleHtuple (integer) (int / long) (Hlong) (Hlong)

The degree p of the NURBS curve. Reasonable values are 3 to 25.

Default value: 3

Suggested values: 2, 3, 4, 5

Restriction: Degree >= 2

RowsRowsRowsRowsrows (output_control)  coordinates.y-array HTupleHTupleHtuple (real) (double) (double) (double)

Row coordinates of the control polygon.

ColsColsColsColscols (output_control)  coordinates.x-array HTupleHTupleHtuple (real) (double) (double) (double)

Columns coordinates of the control polygon.

WeightsWeightsWeightsWeightsweights (output_control)  real-array HTupleHTupleHtuple (real) (double) (double) (double)

Weight vector.

Result

draw_nurbsdraw_nurbsDrawNurbsDrawNurbsDrawNurbs returns 2 (H_MSG_TRUE), if the window is valid. If necessary, an exception is raised.

Possible Predecessors

open_windowopen_windowOpenWindowOpenWindowOpenWindow

Possible Successors

set_coloredset_coloredSetColoredSetColoredSetColored, set_line_widthset_line_widthSetLineWidthSetLineWidthSetLineWidth, set_drawset_drawSetDrawSetDrawSetDraw, set_insertset_insertSetInsertSetInsertSetInsert

Alternatives

draw_xlddraw_xldDrawXldDrawXldDrawXld, draw_nurbs_interpdraw_nurbs_interpDrawNurbsInterpDrawNurbsInterpDrawNurbsInterp

See also

draw_nurbs_moddraw_nurbs_modDrawNurbsModDrawNurbsModDrawNurbsMod, draw_nurbs_interpdraw_nurbs_interpDrawNurbsInterpDrawNurbsInterpDrawNurbsInterp, gen_contour_nurbs_xldgen_contour_nurbs_xldGenContourNurbsXldGenContourNurbsXldGenContourNurbsXld

Module

Foundation


ClassesClasses | | Operators