draw_circle ( : : : Row, Column, Radius )

Interactive creation of a circle.

draw_circle produces the parameter for a circle created interactive by the user in the current 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 Radius's length can be modified through moving the mouse. After another mouse click in the created circle's center you can move it any desired. A click close to the circular arc "grips" the circle to modify the Radius. Pressing the right mousebutton terminates the procedure. After terminating the procedure the circle is not visible in the window any longer.


Parameters

Row (output_control)
circle.center.y -> integer
barycenter's row index.

Column (output_control)
circle.center.x -> integer
barycenter's column index.

Radius (output_control)
circle.radius -> integer
Circle's radius.


Example
read_image(:Image:'affe':) >
draw_circle(:::Row,Column,Radius) >
circle(:Circle:Row,Column,Radius:) >
reduce_domain(Image,Circle:GreyCircle::) >
disp_image(GreyCircle:::).

Result

draw_circle returns TRUE if a window is activated and if the needed drawing mode (see set_insert) is available. If necessary an exception is raised.


Possible Predecessors

open_window, set_window


Possible Successors

reduce_domain, disp_region, set_colored, set_line_width, set_draw, set_insert


Alternatives

draw_ellipse, draw_region


See also

circle, draw_rectangle1, draw_rectangle2, draw_polygon, set_insert



Copyright © 1996-1997 MVTec Software GmbH