Operator Reference

HALCON Operator Reference / Graphics / Drawing

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draw_nurbsT_draw_nurbsDrawNurbsDrawNurbsdraw_nurbs (Operator)

draw_nurbsT_draw_nurbsDrawNurbsDrawNurbsdraw_nurbs — Interactive drawing of a NURBS curve.

Warning

This operator does not work in an HDevelop graphics window opened with dev_open_window.

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)

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

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

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

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)

def draw_nurbs(window_handle: HHandle, rotate: str, move: str, scale: str, keep_ratio: str, degree: int) -> Tuple[HObject, Sequence[float], Sequence[float], Sequence[float]]

Description

draw_nurbsdraw_nurbsDrawNurbsDrawNurbsdraw_nurbs returns the contour ContOutContOutContOutcontOutcont_out 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 WindowHandleWindowHandleWindowHandlewindowHandlewindow_handle. For additional information concerning NURBS curves, see the documentation of gen_contour_nurbs_xldgen_contour_nurbs_xldGenContourNurbsXldGenContourNurbsXldgen_contour_nurbs_xld. To use the control information RowsRowsRowsrowsrows, ColsColsColscolscols, and WeightsWeightsWeightsweightsweights in a subsequent call to the operator gen_contour_nurbs_xldgen_contour_nurbs_xldGenContourNurbsXldGenContourNurbsXldgen_contour_nurbs_xld, 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_interpDrawNurbsInterpDrawNurbsInterpdraw_nurbs_interp, it is possible to create a NURBS curve that interpolates points specified by the user. Directly after calling draw_nurbsdraw_nurbsDrawNurbsDrawNurbsdraw_nurbs, 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

• move the curve by clicking the left mouse button on the cross in the center and then dragging it to the new position,

• rotate it by clicking with the left mouse button on the arrow and then dragging it, till the curve has the right direction, and

• scale it by dragging the double arrow. To keep the ratio the parameter KeepRatioKeepRatioKeepRatiokeepRatiokeep_ratio has to be set to 'true'"true""true""true""true".

By pressing the Shift key again you can switch back to the edit mode. Pressing the right mouse button terminates the procedure.

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

Execution Information

• Multithreading type: reentrant (runs in parallel with non-exclusive operators).
• Multithreading scope: global (may be called from any thread).
• Processed without parallelization.

Parameters

ContOutContOutContOutcontOutcont_out (output_object)  xld_cont → objectHXLDContHObjectHObjectHobject *

Contour approximating the NURBS curve.

WindowHandleWindowHandleWindowHandlewindowHandlewindow_handle (input_control)  window → HWindow, HTupleHHandleHTupleHtuple (handle) (IntPtr) (HHandle) (handle)

Window handle.

RotateRotateRotaterotaterotate (input_control)  string → HTuplestrHTupleHtuple (string) (string) (HString) (char*)

Enable rotation?

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

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

MoveMoveMovemovemove (input_control)  string → HTuplestrHTupleHtuple (string) (string) (HString) (char*)

Enable moving?

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

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

ScaleScaleScalescalescale (input_control)  string → HTuplestrHTupleHtuple (string) (string) (HString) (char*)

Enable scaling?

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

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

KeepRatioKeepRatioKeepRatiokeepRatiokeep_ratio (input_control)  string → HTuplestrHTupleHtuple (string) (string) (HString) (char*)

Keep ratio while scaling?

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

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

DegreeDegreeDegreedegreedegree (input_control)  integer → HTupleintHTupleHtuple (integer) (int / long) (Hlong) (Hlong)

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

Default: 3

Suggested values: 2, 3, 4, 5

Restriction: Degree >= 2

RowsRowsRowsrowsrows (output_control)  coordinates.y-array → HTupleSequence[float]HTupleHtuple (real) (double) (double) (double)

Row coordinates of the control polygon.

ColsColsColscolscols (output_control)  coordinates.x-array → HTupleSequence[float]HTupleHtuple (real) (double) (double) (double)

Columns coordinates of the control polygon.

WeightsWeightsWeightsweightsweights (output_control)  real-array → HTupleSequence[float]HTupleHtuple (real) (double) (double) (double)

Weight vector.

Result

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

Possible Predecessors

open_windowopen_windowOpenWindowOpenWindowopen_window

Possible Successors

set_coloredset_coloredSetColoredSetColoredset_colored, set_line_widthset_line_widthSetLineWidthSetLineWidthset_line_width, set_drawset_drawSetDrawSetDrawset_draw, set_insertset_insertSetInsertSetInsertset_insert

Alternatives

draw_xlddraw_xldDrawXldDrawXlddraw_xld, draw_nurbs_interpdraw_nurbs_interpDrawNurbsInterpDrawNurbsInterpdraw_nurbs_interp

See also

draw_nurbs_moddraw_nurbs_modDrawNurbsModDrawNurbsModdraw_nurbs_mod, draw_nurbs_interpdraw_nurbs_interpDrawNurbsInterpDrawNurbsInterpdraw_nurbs_interp, gen_contour_nurbs_xldgen_contour_nurbs_xldGenContourNurbsXldGenContourNurbsXldgen_contour_nurbs_xld

Module

Foundation

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ClassesClasses | | Operators