draw_ellipseT_draw_ellipseDrawEllipseDrawEllipsedraw_ellipse (算子)
名称
draw_ellipseT_draw_ellipseDrawEllipseDrawEllipsedraw_ellipse — 交互式绘制椭圆。
签名
def draw_ellipse(window_handle: HHandle) -> Tuple[float, float, float, float, float]
描述
draw_ellipsedraw_ellipseDrawEllipseDrawEllipseDrawEllipsedraw_ellipse returns the parameter for any orientated ellipse, which
has been created interactively by the user in the window.
The created ellipse is described by its center, RowRowRowRowrowrow and
ColumnColumnColumnColumncolumncolumn, its orientation, PhiPhiPhiPhiphiphi, and its two half axes,
Radius1Radius1Radius1Radius1radius1radius_1 and Radius2Radius2Radius2Radius2radius2radius_2。
To create an ellipse you have to determine the center of the ellipse with the
left mouse button. Keeping the button pressed determines the length (Radius1Radius1Radius1Radius1radius1radius_1)
and the orientation (PhiPhiPhiPhiphiphi) of the first half axis.
In doing so a temporary default length for the second half axis is assumed, which may be
modified afterwards on demand.
After another mouse click in the center of the created ellipse you can move it.
A mouse click close to a vertex “grips” it to modify the length of the appropriate
half axis. You may modify the orientation only, if a vertex of the first half axis is
gripped.
Pressing the right mouse button terminates the procedure.
After terminating the procedure the ellipse 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) ellipse.center.y → HTuplefloatHTupleHtuple (real) (double) (double) (double)
中心列索引。
ColumnColumnColumnColumncolumncolumn (输出控制) ellipse.center.x → HTuplefloatHTupleHtuple (real) (double) (double) (double)
中心列索引。
PhiPhiPhiPhiphiphi (输出控制) ellipse.angle.rad → HTuplefloatHTupleHtuple (real) (double) (double) (double)
Orientation of the first half axis in radians.
Radius1Radius1Radius1Radius1radius1radius_1 (输出控制) ellipse.radius1 → HTuplefloatHTupleHtuple (real) (double) (double) (double)
First half axis.
Radius2Radius2Radius2Radius2radius2radius_2 (输出控制) ellipse.radius2 → HTuplefloatHTupleHtuple (real) (double) (double) (double)
Second half axis.
示例（HDevelop）
read_image(Image,'monkey')
draw_ellipse(WindowHandle,Row,Column,Phi,Radius1,Radius2)
gen_ellipse(Ellipse,Row,Column,Phi,Radius1,Radius2)
reduce_domain(Image,Ellipse,GrayEllipse)
sobel_amp(GrayEllipse,Sobel,'sum_abs',3)
dev_display(Sobel)
示例（C）
read_image(&Image,"monkey");
draw_ellipse(WindowHandle,&Row,&Column,&Phi,&Radius1,&Radius2);
gen_ellipse(&Ellipse,Row,Column,Phi,Radius1,Radius2);
reduce_domain(Image,Ellipse,&GrayEllipse);
sobel_amp(GrayEllipse,&Sobel,"sum_abs",3);
disp_image(Sobel,WindowHandle);
示例（HDevelop）
read_image(Image,'monkey')
draw_ellipse(WindowHandle,Row,Column,Phi,Radius1,Radius2)
gen_ellipse(Ellipse,Row,Column,Phi,Radius1,Radius2)
reduce_domain(Image,Ellipse,GrayEllipse)
sobel_amp(GrayEllipse,Sobel,'sum_abs',3)
dev_display(Sobel)
示例（HDevelop）
read_image(Image,'monkey')
draw_ellipse(WindowHandle,Row,Column,Phi,Radius1,Radius2)
gen_ellipse(Ellipse,Row,Column,Phi,Radius1,Radius2)
reduce_domain(Image,Ellipse,GrayEllipse)
sobel_amp(GrayEllipse,Sobel,'sum_abs',3)
dev_display(Sobel)
示例（HDevelop）
read_image(Image,'monkey')
draw_ellipse(WindowHandle,Row,Column,Phi,Radius1,Radius2)
gen_ellipse(Ellipse,Row,Column,Phi,Radius1,Radius2)
reduce_domain(Image,Ellipse,GrayEllipse)
sobel_amp(GrayEllipse,Sobel,'sum_abs',3)
dev_display(Sobel)
结果
draw_ellipsedraw_ellipseDrawEllipseDrawEllipseDrawEllipsedraw_ellipse 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，则抛出异常。
可能的前趋
open_windowopen_windowOpenWindowOpenWindowOpenWindowopen_window
可能的后继
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
替代
draw_ellipse_moddraw_ellipse_modDrawEllipseModDrawEllipseModDrawEllipseModdraw_ellipse_mod,
draw_circledraw_circleDrawCircleDrawCircleDrawCircledraw_circle,
draw_regiondraw_regionDrawRegionDrawRegionDrawRegiondraw_region
另见
gen_ellipsegen_ellipseGenEllipseGenEllipseGenEllipsegen_ellipse,
draw_rectangle1draw_rectangle1DrawRectangle1DrawRectangle1DrawRectangle1draw_rectangle1,
draw_rectangle2draw_rectangle2DrawRectangle2DrawRectangle2DrawRectangle2draw_rectangle2,
draw_polygondraw_polygonDrawPolygonDrawPolygonDrawPolygondraw_polygon,
set_insertset_insertSetInsertSetInsertSetInsertset_insert
模块
基础