draw_pointDrawPointDrawPointdraw_pointT_draw_point🔗

Short description🔗

draw_pointDrawPointDrawPointdraw_pointT_draw_point — Draw a point.

Signature🔗

draw_point( window WindowHandle, out point.y Row, out point.x Column )

Description🔗

draw_pointDrawPoint 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🔗

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🔗

WindowHandlewindowHandlewindow_handle (input_control) window → (handle)HTuple (HHandle)HWindow, HTuple (IntPtr)HHandleHtuple (handle)

Window handle.

Rowrowrow (output_control) point.y → (real)HTuple (double)HTuple (double)floatHtuple (double)

Row index of the point.

Columncolumncolumn (output_control) point.x → (real)HTuple (double)HTuple (double)floatHtuple (double)

Column index of the point.

Example🔗

(HDevelop)

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

(C)

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

Result🔗

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

Combinations with other operators🔗

Combinations

Possible predecessors

open_windowOpenWindow

Possible successors

reduce_domainReduceDomain, disp_lineDispLine, set_coloredSetColored, set_line_widthSetLineWidth, set_drawSetDraw

Module🔗

Foundation