draw_circle_outline_antialiased Subroutine

public subroutine draw_circle_outline_antialiased(image_data, img_w, img_h, cx, cy, radius, r, g, b, edge_width, opacity)

Draw circle outline with antialiasing

Renders a circular outline (ring) using distance-based antialiasing. Alpha computed from distance to the ideal circle boundary. Used for circle markers with edge-only rendering.

Arguments

Type	Intent	Optional	Attributes		Name
integer(kind=1),	intent(inout)			::	image_data(:)
integer,	intent(in)			::	img_w
integer,	intent(in)			::	img_h
real(kind=wp),	intent(in)			::	cx
real(kind=wp),	intent(in)			::	cy
real(kind=wp),	intent(in)			::	radius	Circle radius in pixels
real(kind=wp),	intent(in)			::	r	Circle radius in pixels
real(kind=wp),	intent(in)			::	g	Circle radius in pixels
real(kind=wp),	intent(in)			::	b	Circle radius in pixels
real(kind=wp),	intent(in)			::	edge_width
real(kind=wp),	intent(in)			::	opacity