MATLAB Examples

This is an example of how to create filled polygons on a plot in MATLAB®.

```% Create a yellow triangle figure x = [0.25, 1.0, 1.0]; y = [0.25, 0.25, 1.0]; fill(x, y, 'y') hold on % Create an orange diamond x = [2.0, 2.25, 2.0, 1.75]; y = [1.25, 1.55, 2.25, 1.5]; c = [1 0.8 0.3]; fill(x, y, c) % Create a blue rectangle left = 3.0; right = left + 0.5; bottom = 1.0; top = bottom + 1; x = [left left right right]; y = [bottom top top bottom]; fill(x, y, 'b') % Create a purple transparent circle xc = 3.0; yc = 1.0; r = 0.5; x = r*sin(-pi:0.1*pi:pi) + xc; y = r*cos(-pi:0.1*pi:pi) + yc; c = [0.6 0 1]; fill(x, y, c, 'FaceAlpha', 0.4) % Create a light blue star xc = 1.0; yc = 3.0; t = (-1/4:1/10:3/4)*2*pi; r1 = 0.5; r2 = 0.2; r = (r1+r2)/2 + (r1-r2)/2*(-1).^[0:10]; x = r.*cos(t) + xc; y = r2 - r.*sin(t) + yc; c = [0.6 0.8 1.0]; fill(x, y, c) % Create a green transparent ellipse xc = 0.75; yc = 2.5; x = 0.4*sin(-pi:0.1*pi:pi) + xc; y = 0.7*cos(-pi:0.1*pi:pi) + yc; c = [0 0.5 0]; fill(x, y, c, 'FaceAlpha', 0.2) % Create a red stop sign t = (1/16:1/8:1)'*2*pi; x = 0.4*sin(t) + 3; y = 0.4*cos(t) + 3; fill(x, y ,'r', 'FaceAlpha', 1) % Set the axis limits axis([0 4 0 4]) axis square % Add a title title('Filled Polygons') ```