DRAWCIRCLE - Create and draw simple circle.

Contents

Description

Create and draw simple circle defined by its center, its radius and the number of sampled points on it.

Syntax

   DRAWCIRCLE(center, radius, NOP);
   [coord, A] = DRAWCIRCLE(center, radius, NOP, disp, style);

Inputs

center, radius, NOP : resp. center, radius and number of sampled points of the circle to be represented.

disp : (optional) flag for drawing (discrete) lines; default: disp=false.

style : (optional) string defining the style for display (see options for PLOT); default: style = 'b-'.

Outputs

coord : (NOP,2) matrix storing the (X,Y)-coordinates of the NOP grid points used to represent the circle.

A : appproximate representation of the output circle in a logical image.

See also

Ressembles: DRAWLEAKCIRCLE, DRAWGESTALT. Requires: DRAWCIRCLE_BASE.

Function implementation

function varargout = drawcircle(center, radius, NOP, disp, style)

checking/setting parameters

error(nargchk(2, 4, nargin, 'struct'));
error(nargoutchk(0, 2, nargout, 'struct'));

% set default
if nargin<5
    style = 'b-';
    if nargin<4
        if nargout==0,  disp = true;
        else            disp = false;     end
        if nargin<3,  NOP = 50;  end
    end
end

main computation

[coord, A] = drawcircle_base(center, radius, NOP);

if disp,  figure, axis square, plot(coord(:,1), coord(:,2), style);  end

if nargout>=1,  varargout{1} = coord;
    if nargout==2,  varargout{2} = A;  end
end

end % end of drawcircle