draw_circleT_draw_circleDrawCircleDrawCircledraw_circle (算子名称)
名称
draw_circleT_draw_circleDrawCircleDrawCircledraw_circle — Interactive drawing of a circle.
参数签名
def draw_circle(window_handle: HHandle) -> Tuple[float, float, float]
描述
draw_circledraw_circleDrawCircleDrawCircleDrawCircledraw_circle produces the parameter for a circle created interactive by
the user in the window.
To create a circle you have to press the mouse button at the location which is used
as the center of that circle. While keeping the mouse button pressed, the
RadiusRadiusRadiusRadiusradiusradius's length can be modified through moving the mouse.
After another mouse click in the created circle center you can move it.
A clicking close to the circular arc you can modify the RadiusRadiusRadiusRadiusradiusradius of
the circle.
Pressing the right mouse button terminates the procedure.
After terminating the procedure the circle 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.
运行信息
- 多线程类型:可重入(与非独占操作符并行运行)。
- 多线程作用域:全局(可以从任何线程调用)。
- 未经并行化处理。
参数表
WindowHandleWindowHandleWindowHandleWindowHandlewindowHandlewindow_handle (input_control) window → HWindow, HTupleHHandleHTupleHtuple (handle) (IntPtr) (HHandle) (handle)
Window handle.
RowRowRowRowrowrow (output_control) circle.center.y → HTuplefloatHTupleHtuple (real) (double) (double) (double)
Barycenter's row index.
ColumnColumnColumnColumncolumncolumn (output_control) circle.center.x → HTuplefloatHTupleHtuple (real) (double) (double) (double)
Barycenter's column index.
RadiusRadiusRadiusRadiusradiusradius (output_control) circle.radius → HTuplefloatHTupleHtuple (real) (double) (double) (double)
Circle's radius.
例程 (HDevelop)
read_image(Image,'monkey')
draw_circle(WindowHandle,Row,Column,Radius)
gen_circle(Circle,Row,Column,Radius)
reduce_domain(Image,Circle,ImageReduced)
invert_image (ImageReduced, ImageInvert)
dev_display (ImageInvert)
例程 (C)
read_image(&Image,"monkey");
draw_circle(WindowHandle,&Row,&Column,&Radius);
gen_circle(&Circle,Row,Column,Radius);
reduce_domain(Image,Circle,&GrayCircle);
disp_image(GrayCircle,WindowHandle);
例程 (HDevelop)
read_image(Image,'monkey')
draw_circle(WindowHandle,Row,Column,Radius)
gen_circle(Circle,Row,Column,Radius)
reduce_domain(Image,Circle,ImageReduced)
invert_image (ImageReduced, ImageInvert)
dev_display (ImageInvert)
例程 (HDevelop)
read_image(Image,'monkey')
draw_circle(WindowHandle,Row,Column,Radius)
gen_circle(Circle,Row,Column,Radius)
reduce_domain(Image,Circle,ImageReduced)
invert_image (ImageReduced, ImageInvert)
dev_display (ImageInvert)
例程 (HDevelop)
read_image(Image,'monkey')
draw_circle(WindowHandle,Row,Column,Radius)
gen_circle(Circle,Row,Column,Radius)
reduce_domain(Image,Circle,ImageReduced)
invert_image (ImageReduced, ImageInvert)
dev_display (ImageInvert)
结果
draw_circledraw_circleDrawCircleDrawCircleDrawCircledraw_circle returns 2 (
H_MSG_TRUE)
if the window is valid and the
needed drawing mode (see set_insertset_insertSetInsertSetInsertSetInsertset_insert) is available.
如有必要，将引发异常。
可能的前置算子
open_windowopen_windowOpenWindowOpenWindowOpenWindowopen_window
可能的后置算子
reduce_domainreduce_domainReduceDomainReduceDomainReduceDomainreduce_domain,
disp_regiondisp_regionDispRegionDispRegionDispRegiondisp_region,
set_coloredset_coloredSetColoredSetColoredSetColoredset_colored,
set_line_widthset_line_widthSetLineWidthSetLineWidthSetLineWidthset_line_width,
set_drawset_drawSetDrawSetDrawSetDrawset_draw,
set_insertset_insertSetInsertSetInsertSetInsertset_insert
可替代算子
draw_circle_moddraw_circle_modDrawCircleModDrawCircleModDrawCircleModdraw_circle_mod,
draw_ellipsedraw_ellipseDrawEllipseDrawEllipseDrawEllipsedraw_ellipse,
draw_regiondraw_regionDrawRegionDrawRegionDrawRegiondraw_region
参考其它
gen_circlegen_circleGenCircleGenCircleGenCirclegen_circle,
draw_rectangle1draw_rectangle1DrawRectangle1DrawRectangle1DrawRectangle1draw_rectangle1,
draw_rectangle2draw_rectangle2DrawRectangle2DrawRectangle2DrawRectangle2draw_rectangle2,
draw_polygondraw_polygonDrawPolygonDrawPolygonDrawPolygondraw_polygon,
set_insertset_insertSetInsertSetInsertSetInsertset_insert
模块
Foundation