Operator Reference

HALCON Operator Reference / Graphics / Drawing
ClassesClasses | | Operators

draw_ellipseT_draw_ellipseDrawEllipseDrawEllipsedraw_ellipse (Operator)

draw_ellipseT_draw_ellipseDrawEllipseDrawEllipsedraw_ellipse — Interactive drawing of an ellipse.

Signature

draw_ellipse( : : WindowHandle : Row, Column, Phi, Radius1, Radius2)

Herror T_draw_ellipse(const Htuple WindowHandle, Htuple* Row, Htuple* Column, Htuple* Phi, Htuple* Radius1, Htuple* Radius2)

void DrawEllipse(const HTuple& WindowHandle, HTuple* Row, HTuple* Column, HTuple* Phi, HTuple* Radius1, HTuple* Radius2)

void HWindow::DrawEllipse(double* Row, double* Column, double* Phi, double* Radius1, double* Radius2) const

static void HOperatorSet.DrawEllipse(HTuple windowHandle, out HTuple row, out HTuple column, out HTuple phi, out HTuple radius1, out HTuple radius2)

void HWindow.DrawEllipse(out double row, out double column, out double phi, out double radius1, out double radius2)

def draw_ellipse(window_handle: HHandle) -> Tuple[float, float, float, float, float]

Description

draw_ellipsedraw_ellipseDrawEllipseDrawEllipsedraw_ellipse returns the parameter for any orientated ellipse, which has been created interactively by the user in the window.

The created ellipse is described by its center, RowRowRowrowrow and ColumnColumnColumncolumncolumn, its orientation, PhiPhiPhiphiphi, and its two half axes, Radius1Radius1Radius1radius1radius_1 and Radius2Radius2Radius2radius2radius_2.

To create an ellipse you have to determine the center of the ellipse with the left mouse button. Keeping the button pressed determines the length (Radius1Radius1Radius1radius1radius_1) and the orientation (PhiPhiPhiphiphi) of the first half axis. In doing so a temporary default length for the second half axis is assumed, which may be modified afterwards on demand. After another mouse click in the center of the created ellipse you can move it. A mouse click close to a vertex “grips” it to modify the length of the appropriate half axis. You may modify the orientation only, if a vertex of the first half axis is gripped.

Pressing the right mouse button terminates the procedure. After terminating the procedure the ellipse is not visible in the window any longer.

Attention

If used in a buffer window, mouse events have to be supplied by the application, while the draw operator must be run in another thread.

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

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

Window handle.

RowRowRowrowrow (output_control)  ellipse.center.y → HTuplefloatHTupleHtuple (real) (double) (double) (double)

Row index of the center.

ColumnColumnColumncolumncolumn (output_control)  ellipse.center.x → HTuplefloatHTupleHtuple (real) (double) (double) (double)

Column index of the center.

PhiPhiPhiphiphi (output_control)  ellipse.angle.rad → HTuplefloatHTupleHtuple (real) (double) (double) (double)

Orientation of the first half axis in radians.

Radius1Radius1Radius1radius1radius_1 (output_control)  ellipse.radius1 → HTuplefloatHTupleHtuple (real) (double) (double) (double)

First half axis.

Radius2Radius2Radius2radius2radius_2 (output_control)  ellipse.radius2 → HTuplefloatHTupleHtuple (real) (double) (double) (double)

Second half axis.

Example (HDevelop)

read_image(Image,'monkey')
draw_ellipse(WindowHandle,Row,Column,Phi,Radius1,Radius2)
gen_ellipse(Ellipse,Row,Column,Phi,Radius1,Radius2)
reduce_domain(Image,Ellipse,GrayEllipse)
sobel_amp(GrayEllipse,Sobel,'sum_abs',3)
dev_display(Sobel)

Example (C)

read_image(&Image,"monkey");
draw_ellipse(WindowHandle,&Row,&Column,&Phi,&Radius1,&Radius2);
gen_ellipse(&Ellipse,Row,Column,Phi,Radius1,Radius2);
reduce_domain(Image,Ellipse,&GrayEllipse);
sobel_amp(GrayEllipse,&Sobel,"sum_abs",3);
disp_image(Sobel,WindowHandle);

Example (HDevelop)

read_image(Image,'monkey')
draw_ellipse(WindowHandle,Row,Column,Phi,Radius1,Radius2)
gen_ellipse(Ellipse,Row,Column,Phi,Radius1,Radius2)
reduce_domain(Image,Ellipse,GrayEllipse)
sobel_amp(GrayEllipse,Sobel,'sum_abs',3)
dev_display(Sobel)

Example (HDevelop)

read_image(Image,'monkey')
draw_ellipse(WindowHandle,Row,Column,Phi,Radius1,Radius2)
gen_ellipse(Ellipse,Row,Column,Phi,Radius1,Radius2)
reduce_domain(Image,Ellipse,GrayEllipse)
sobel_amp(GrayEllipse,Sobel,'sum_abs',3)
dev_display(Sobel)

Result

draw_ellipsedraw_ellipseDrawEllipseDrawEllipsedraw_ellipse returns 2 ( H_MSG_TRUE) , if the window is valid and the needed drawing mode (see set_insertset_insertSetInsertSetInsertset_insert) is available. If necessary, an exception is raised.

Possible Predecessors

open_windowopen_windowOpenWindowOpenWindowopen_window

Possible Successors

reduce_domainreduce_domainReduceDomainReduceDomainreduce_domain, disp_regiondisp_regionDispRegionDispRegiondisp_region, set_coloredset_coloredSetColoredSetColoredset_colored, set_line_widthset_line_widthSetLineWidthSetLineWidthset_line_width, set_drawset_drawSetDrawSetDrawset_draw, set_insertset_insertSetInsertSetInsertset_insert

Alternatives

draw_ellipse_moddraw_ellipse_modDrawEllipseModDrawEllipseModdraw_ellipse_mod, draw_circledraw_circleDrawCircleDrawCircledraw_circle, draw_regiondraw_regionDrawRegionDrawRegiondraw_region

See also

gen_ellipsegen_ellipseGenEllipseGenEllipsegen_ellipse, draw_rectangle1draw_rectangle1DrawRectangle1DrawRectangle1draw_rectangle1, draw_rectangle2draw_rectangle2DrawRectangle2DrawRectangle2draw_rectangle2, draw_polygondraw_polygonDrawPolygonDrawPolygondraw_polygon, set_insertset_insertSetInsertSetInsertset_insert

Module

Foundation

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