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

draw_lineT_draw_lineDrawLineDrawLine (Operator)

Name

draw_lineT_draw_lineDrawLineDrawLine — Draw a line.

Signature

draw_line( : : WindowHandle : Row1, Column1, Row2, Column2)

Herror T_draw_line(const Htuple WindowHandle, Htuple* Row1, Htuple* Column1, Htuple* Row2, Htuple* Column2)

void DrawLine(const HTuple& WindowHandle, HTuple* Row1, HTuple* Column1, HTuple* Row2, HTuple* Column2)

void HWindow::DrawLine(double* Row1, double* Column1, double* Row2, double* Column2) const

static void HOperatorSet.DrawLine(HTuple windowHandle, out HTuple row1, out HTuple column1, out HTuple row2, out HTuple column2)

void HWindow.DrawLine(out double row1, out double column1, out double row2, out double column2)

Description

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

To create a line you have to press the left mouse button determining a start point of the line. While keeping the button pressed you may “drag” the line in any direction. After another mouse click in the middle of the created line you can move it. If you click on one end point of the created line, you may move this point. Pressing the right mouse button terminates the procedure. On macOS draw_linedraw_lineDrawLineDrawLineDrawLine can also be terminated by pressing the escape key.

After terminating the procedure the line 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.

Row1Row1Row1Row1row1 (output_control)  line.begin.y → HTupleHTupleHtuple (real) (double) (double) (double)

Row index of the first point of the line.

Column1Column1Column1Column1column1 (output_control)  line.begin.x → HTupleHTupleHtuple (real) (double) (double) (double)

Column index of the first point of the line.

Row2Row2Row2Row2row2 (output_control)  line.end.y → HTupleHTupleHtuple (real) (double) (double) (double)

Row index of the second point of the line.

Column2Column2Column2Column2column2 (output_control)  line.end.x → HTupleHTupleHtuple (real) (double) (double) (double)

Column index of the second point of the line.

Example (HDevelop)

draw_line(WindowHandle,Row1,Column1,Row2,Column2)
gen_contour_polygon_xld (Line, [Row1,Row2], [Column1,Column2])
dev_display (Line)

Example (C)

draw_line(WindowHandle,&Row1,&Column1,&Row2,&Column2) ;
disp_line(WindowHandle,Row1,Column1,Row2,Column2) ;

Example (HDevelop)

draw_line(WindowHandle,Row1,Column1,Row2,Column2)
gen_contour_polygon_xld (Line, [Row1,Row2], [Column1,Column2])
dev_display (Line)

Example (HDevelop)

draw_line(WindowHandle,Row1,Column1,Row2,Column2)
gen_contour_polygon_xld (Line, [Row1,Row2], [Column1,Column2])
dev_display (Line)

Example (HDevelop)

draw_line(WindowHandle,Row1,Column1,Row2,Column2)
gen_contour_polygon_xld (Line, [Row1,Row2], [Column1,Column2])
dev_display (Line)

Result

draw_linedraw_lineDrawLineDrawLineDrawLine returns 2 (H_MSG_TRUE), if the window is valid and the needed drawing mode (see set_insertset_insertSetInsertSetInsertSetInsert) 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_line_moddraw_line_modDrawLineModDrawLineModDrawLineMod, gen_rectangle1gen_rectangle1GenRectangle1GenRectangle1GenRectangle1, draw_circledraw_circleDrawCircleDrawCircleDrawCircle, draw_ellipsedraw_ellipseDrawEllipseDrawEllipseDrawEllipse, set_insertset_insertSetInsertSetInsertSetInsert

Module

Foundation

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