Operator Reference

HALCON Operator Reference / Graphics / Drawing

• HDevelop
• .NET
• Python
• C++
• C

ClassesClasses | | Operators

draw_pointT_draw_pointDrawPointDrawPointdraw_point (Operator)

draw_pointT_draw_pointDrawPointDrawPointdraw_point — 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)

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

Description

draw_pointdraw_pointDrawPointDrawPointdraw_point 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.

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

• 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)  point.y → HTuplefloatHTupleHtuple (real) (double) (double) (double)

Row index of the point.

ColumnColumnColumncolumncolumn (output_control)  point.x → HTuplefloatHTupleHtuple (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)

Result

draw_pointdraw_pointDrawPointDrawPointdraw_point 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_windowOpenWindowOpenWindowopen_window

Possible Successors

reduce_domainreduce_domainReduceDomainReduceDomainreduce_domain, disp_linedisp_lineDispLineDispLinedisp_line, set_coloredset_coloredSetColoredSetColoredset_colored, set_line_widthset_line_widthSetLineWidthSetLineWidthset_line_width, set_drawset_drawSetDrawSetDrawset_draw, set_insertset_insertSetInsertSetInsertset_insert

See also

draw_point_moddraw_point_modDrawPointModDrawPointModdraw_point_mod, draw_circledraw_circleDrawCircleDrawCircledraw_circle, draw_ellipsedraw_ellipseDrawEllipseDrawEllipsedraw_ellipse, set_insertset_insertSetInsertSetInsertset_insert

Module

Foundation

---

ClassesClasses | | Operators