HALCON 18.05 / HALCON Operator Reference / Graphics / Drawing
ClassesClasses | | Operators

draw_pointT_draw_pointDrawPointDrawPoint (Operator)

Name

draw_pointT_draw_pointDrawPointDrawPoint — Draw a point.

Signature

draw_point( : : WindowHandle : Row, Column)

Herror T_draw_point(const Htuple WindowHandle, Htuple* Row, Htuple* Column)

void DrawPoint(const HTuple& WindowHandle, HTuple* Row, HTuple* Column)

void HWindow::DrawPoint(double* Row, double* Column) const

static void HOperatorSet.DrawPoint(HTuple windowHandle, out HTuple row, out HTuple column)

void HWindow.DrawPoint(out double row, out double column)

Description

draw_pointdraw_pointDrawPointDrawPointDrawPoint returns the parameter for a point, which has been created interactively by the user in the window.

To create a point you have to press the left mouse button. While keeping the button pressed you may “drag” the point in any direction. Pressing the right mouse button terminates the procedure. On macOS draw_pointdraw_pointDrawPointDrawPointDrawPoint can also be terminated by pressing the escape key.

After terminating the procedure the point 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

Parameters

WindowHandleWindowHandleWindowHandleWindowHandlewindowHandle (input_control)  window → HWindow, HTupleHTupleHtuple (handle) (IntPtr) (HHandle) (handle)

Window handle.

RowRowRowRowrow (output_control)  point.y → HTupleHTupleHtuple (real) (double) (double) (double)

Row index of the point.

ColumnColumnColumnColumncolumn (output_control)  point.x → HTupleHTupleHtuple (real) (double) (double) (double)

Column index of the point.

Example (HDevelop)

draw_point(WindowHandle,Row,Column)
gen_cross_contour_xld (Cross, Row, Column, 6, 0)

Example (C)

draw_point(WindowHandle,&Row,&Column) ;
gen_cross_contour_xld (&Cross, Row, Column, 6.0, 0.0) ;

Example (HDevelop)

draw_point(WindowHandle,Row,Column)
gen_cross_contour_xld (Cross, Row, Column, 6, 0)

Example (HDevelop)

draw_point(WindowHandle,Row,Column)
gen_cross_contour_xld (Cross, Row, Column, 6, 0)

Example (HDevelop)

draw_point(WindowHandle,Row,Column)
gen_cross_contour_xld (Cross, Row, Column, 6, 0)

Result

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

Possible Predecessors

open_windowopen_windowOpenWindowOpenWindowOpenWindow

Possible Successors

reduce_domainreduce_domainReduceDomainReduceDomainReduceDomain, disp_linedisp_lineDispLineDispLineDispLine, set_coloredset_coloredSetColoredSetColoredSetColored, set_line_widthset_line_widthSetLineWidthSetLineWidthSetLineWidth, set_drawset_drawSetDrawSetDrawSetDraw, set_insertset_insertSetInsertSetInsertSetInsert

See also

draw_point_moddraw_point_modDrawPointModDrawPointModDrawPointMod, draw_circledraw_circleDrawCircleDrawCircleDrawCircle, draw_ellipsedraw_ellipseDrawEllipseDrawEllipseDrawEllipse, set_insertset_insertSetInsertSetInsertSetInsert

Module

Foundation

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HALCON Operator Reference 18.05 Copyright © 1996-2018 MVTec Software GmbH