VISIO::CANVAS_CIRCLE
(int canvas, int xpos, int ypos, int xradius, int yradius, int
flag)
Description: Draws an ellips
on the specified canvas with the center on coordinates (xpos, ypos). The
ellips has a specified x-radius and y-radius. If the flag contains a
'0' then the ellips is not filled up. Else a massive ellips is drawn.
By default the color of the ellips will be black, unless the color
is set with the command visio::canvas_fg_color.
Example: VISIO::CANVAS_CIRCLE
(canvas, 20, 20, 30, 10, 0)