template->circle -- Add a circle to a template
int template->circle ( int template, float centerx, float centery, float radius[, array parameters] )
This method is used to add a circle to a template.
template must be a valid template ID.
centerx and centery
specify the location of the circle's center.
radius specifies the radius of the circle.
parameters is an array as described in the parameters documentation.
If omitted, default values are used.
This function was added in version 2.2.