draw_pointT_draw_pointDrawPointDrawPointdraw_point (算子)
名称
draw_pointT_draw_pointDrawPointDrawPointdraw_point — 画一个点。
签名
描述
draw_pointdraw_pointDrawPointDrawPointDrawPointdraw_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.
注意
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.
执行信息
- 多线程类型：可重入（与非独占算子并行运行）。
- 多线程作用域：全局（可从任何线程调用）。
- 未采用并行化处理。
参数
WindowHandleWindowHandleWindowHandleWindowHandlewindowHandlewindow_handle (输入控制) window → HWindow, HTupleHHandleHTupleHtuple (handle) (IntPtr) (HHandle) (handle)
窗口句柄。
RowRowRowRowrowrow (输出控制) point.y → HTuplefloatHTupleHtuple (real) (double) (double) (double)
Row index of the point.
ColumnColumnColumnColumncolumncolumn (输出控制) point.x → HTuplefloatHTupleHtuple (real) (double) (double) (double)
Column index of the point.
示例（HDevelop）
draw_point(WindowHandle,Row,Column)
gen_cross_contour_xld (Cross, Row, Column, 6, 0)
示例（C）
draw_point(WindowHandle,&Row,&Column);
gen_cross_contour_xld (&Cross, Row, Column, 6.0, 0.0);
示例（HDevelop）
draw_point(WindowHandle,Row,Column)
gen_cross_contour_xld (Cross, Row, Column, 6, 0)
示例（HDevelop）
draw_point(WindowHandle,Row,Column)
gen_cross_contour_xld (Cross, Row, Column, 6, 0)
示例（HDevelop）
draw_point(WindowHandle,Row,Column)
gen_cross_contour_xld (Cross, Row, Column, 6, 0)
结果
draw_pointdraw_pointDrawPointDrawPointDrawPointdraw_point returns 2 (
H_MSG_TRUE)
, if the window is valid and the
needed drawing mode is available。如有必要，则抛出异常。
可能的前趋
open_windowopen_windowOpenWindowOpenWindowOpenWindowopen_window
可能的后继
reduce_domainreduce_domainReduceDomainReduceDomainReduceDomainreduce_domain,
disp_linedisp_lineDispLineDispLineDispLinedisp_line,
set_coloredset_coloredSetColoredSetColoredSetColoredset_colored,
set_line_widthset_line_widthSetLineWidthSetLineWidthSetLineWidthset_line_width,
set_drawset_drawSetDrawSetDrawSetDrawset_draw,
set_insertset_insertSetInsertSetInsertSetInsertset_insert
另见
draw_point_moddraw_point_modDrawPointModDrawPointModDrawPointModdraw_point_mod,
draw_circledraw_circleDrawCircleDrawCircleDrawCircledraw_circle,
draw_ellipsedraw_ellipseDrawEllipseDrawEllipseDrawEllipsedraw_ellipse,
set_insertset_insertSetInsertSetInsertSetInsertset_insert
模块
基础