set(0, 'DefaultAxesFontSize', 20); % set default figure font size
set(0, 'DefaultAxesFontName', 'Times New Roman'); % set default figure font

% draw arrows
drawArrow = @(x,y) quiver( x(1),x(2),y(1)-x(1),y(2)-x(2),0,'-r','LineWidth',2,'MaxHeadSize',0.5);
drawArrow(cur_point,next_point); hold on