Creating a star shape using the imshow() function.

The shape should look like a star

⭐⭐

and should use MATLAB and the imshow() function.

Answer 1

[Image Analyst]

Try this:

clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
clear;  % Erase all existing variables. Or clearvars if you want.
workspace;  % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 20;

stepSize = 360 / 5;
angles1 = 0 : stepSize : 360;
angles2 = stepSize/2 : stepSize : 360 + stepSize/2;
r1 = 150;
r2 = 300;
x1 = r1 * cosd(angles1);
y1 = r1 * sind(angles1);
x2 = r2 * cosd(angles2);
y2 = r2 * sind(angles2);
subplot(2,2,1);
plot(x1, y1, 'LineWidth', 2);
hold on;
plot(x2, y2, 'LineWidth', 2);
grid on;
x3 = reshape([x1;x2], 1, []);
y3 = reshape([y1;y2], 1, []);
% Shift center to 500, 500
x3 = x3 + 500;
y3 = y3 + 500;
subplot(2,2,2);
plot(x3, y3, 'LineWidth', 2);

% Make 900x900 image from the coordinates.
subplot(2,2,3);
maskImage = poly2mask(x3, y3, 900, 900);
imshow(maskImage);
axis on;

[ammar khider]

its not working properly. Undefined function or variable 'poly2mask'. Error in Untitled009 (line 31) maskImage = poly2mask(x3, y3, 900, 900);

[Image Analyst]

Then you do not have the Image Processing Toolbox. Use the ver command to check. You'll have to use some other way to turn the vertices into an image, which you need to do because it says you must use imshow().

Answer 2

[Image Analyst]

Fancier demo attached.