fillline.m

function [xx,yy]=fillline(startp,endp,pts)
    % take starting, ending point & number of points in between
% make line to connect between 2 coordinates
% shaz (2022). Get points for a line between 2 points (https://www.mathworks.com/matlabcentral/fileexchange/29104-get-points-for-a-line-between-2-points), MATLAB Central File Exchange. Retrieved February 24, 2022.
        m=(endp(2)-startp(2))/(endp(1)-startp(1)); %gradient 

        if m==Inf %vertical line
            xx(1:pts)=startp(1);
            yy(1:pts)=linspace(startp(2),endp(2),pts);
        elseif m==0 %horizontal line
            xx(1:pts)=linspace(startp(1),endp(1),pts);
            yy(1:pts)=startp(2);
        else %if (endp(1)-startp(1))~=0
            xx=linspace(startp(1),endp(1),pts);
            yy=m*(xx-startp(1))+startp(2);
        end
end