Quadrature rectangles transparency in plot

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Hi,
How can I change the transparency of the rectangles?
function [I]=bobby_85(n) % n=30; n=300;
p=1;
h=1/(n-1);
I=0;
x=0;
xv=linspace(0,1,n);
close(figure(1))
figure(1)
axis([0 1 0 1])
plot(xv,f(xv),'k')
hold on
for i=1:n-1
I=I+h*f(x);
figure(1)
plot(x,f(x),'r.','MarkerSize',10)
x=x+h;
pause(3/n^p)
end
plot(1,f(1),'r.','MarkerSize',10)
pause(3/n^p)
x=0;
for i=1:n-1
figure(1)
plot([x x],[0 f(x)],'b')
plot([x x+h],[f(x) f(x)],'b')
pause(3/n^p)
plot([x+h x+h],[0 f(x)],'b')
pause(3/n^p)
area([x x+h],[f(x) f(x)])
x=x+h;
pause(3/n^p)
end
title(['n=', num2str(n)])
text(0.1, 0.8, ['integral=',num2str(I,16)])
hold off
function [y]=f(x)
% y=exp(-x.^2);
% y=x.*sin(x);
% y=x+sin(x);
% y=x;
% y=x.^2;
y=0.2+x.*sin(10*x);
end
end

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