ClassesClasses | | Operators

draw_circleT_draw_circleDrawCircleDrawCircle (Operator)

Name

draw_circleT_draw_circleDrawCircleDrawCircle — Interactive drawing of a circle.

Signature

draw_circle( : : WindowHandle : Row, Column, Radius)

Herror T_draw_circle(const Htuple WindowHandle, Htuple* Row, Htuple* Column, Htuple* Radius)

void DrawCircle(const HTuple& WindowHandle, HTuple* Row, HTuple* Column, HTuple* Radius)

void HWindow::DrawCircle(double* Row, double* Column, double* Radius) const

static void HOperatorSet.DrawCircle(HTuple windowHandle, out HTuple row, out HTuple column, out HTuple radius)

void HWindow.DrawCircle(out double row, out double column, out double radius)

Description

draw_circledraw_circleDrawCircleDrawCircleDrawCircle 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 RadiusRadiusRadiusRadiusradius'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 RadiusRadiusRadiusRadiusradius of the circle. Pressing the right mouse button terminates the procedure. On macOS draw_circledraw_circleDrawCircleDrawCircleDrawCircle can also be terminated by pressing the escape key. After terminating the procedure the circle 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.

RowRowRowRowrow (output_control)  circle.center.y HTupleHTupleHtuple (real) (double) (double) (double)

Barycenter's row index.

ColumnColumnColumnColumncolumn (output_control)  circle.center.x HTupleHTupleHtuple (real) (double) (double) (double)

Barycenter's column index.

RadiusRadiusRadiusRadiusradius (output_control)  circle.radius HTupleHTupleHtuple (real) (double) (double) (double)

Circle's radius.

Example (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)

Example (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) ;

Example (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)

Example (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)

Example (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)

Result

draw_circledraw_circleDrawCircleDrawCircleDrawCircle 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_regiondisp_regionDispRegionDispRegionDispRegion, set_coloredset_coloredSetColoredSetColoredSetColored, set_line_widthset_line_widthSetLineWidthSetLineWidthSetLineWidth, set_drawset_drawSetDrawSetDrawSetDraw, set_insertset_insertSetInsertSetInsertSetInsert

Alternatives

draw_circle_moddraw_circle_modDrawCircleModDrawCircleModDrawCircleMod, draw_ellipsedraw_ellipseDrawEllipseDrawEllipseDrawEllipse, draw_regiondraw_regionDrawRegionDrawRegionDrawRegion

See also

gen_circlegen_circleGenCircleGenCircleGenCircle, draw_rectangle1draw_rectangle1DrawRectangle1DrawRectangle1DrawRectangle1, draw_rectangle2draw_rectangle2DrawRectangle2DrawRectangle2DrawRectangle2, draw_polygondraw_polygonDrawPolygonDrawPolygonDrawPolygon, set_insertset_insertSetInsertSetInsertSetInsert

Module

Foundation


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