%Example of drawing an ellipse and a square. Note that both shapes are
%drawn via the function 'rectangle'
clear;

figure;
hold on;

%1. Draw a curve: just to show the shapes can be superposed to a
%traditional plot.
v = -1:0.1:1;
plot(v,v.^3, 'linewidth',2);    

%2. This draws a rectangle with lower left corner at (-0.5 0.5) and of
%width/height 0.2
r1 = rectangle('position',[-0.5 0.5 0.2 0.2],'linewidth',2);

%3. This draws an ellipse with lower left corner of the bounding box at
%(0.2,-0.5), width of 0.2 and height of 0.3. 
r2 = rectangle('position',[0.2 -0.5 0.2 0.3],'curvature',[1 1],'linewidth',2);

set(r1,'facecolor','r'); %Paint the square surface red