Drawing a star with n points
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James Connor
le 16 Oct 2015
Commenté : Adam Danz
le 25 Mar 2021
Hi guys I have this question to do but I have no clue for any of it.
First write a function file star.m with first line function turtle=star(turtle,npoints,R,r) which uses turtle to draw a star centred at the turtle’s current location. Inputs: • turtle: an initialized turtle to draw the star with; • npoints: the number of points the star; • R: distance from the centre of the star to the points; • r: distance from the centre to the inward corners between the points. Output turtle: turtle used for drawing in its new state. One point of the star should point in the initial direction of the turtle.
Thanks help would be appreciated.
4 commentaires
Adam Danz
le 25 Mar 2021
- number of rays
- center point
- inner and outer diameters
- orientation
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/562801/image.png)
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Image Analyst
le 16 Oct 2015
Attached are my only two star demos. You're welcome to adapt them.
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Image Analyst
le 18 Oct 2015
Modifié(e) : Image Analyst
le 18 Oct 2015
James, try this to draw one star. Change parameters to do whatever else you need to do with your turtle to define the location and angle of the star.
% Define parameters
numberOfPoints = 5;
rotationAngle = 0;
xCenter = 3;
yCenter = 4;
% Determine the angles that the arm tips are at
theta = (0 : (numberOfPoints-1)/numberOfPoints*pi : (numberOfPoints-1)*pi) + rotationAngle;
% Define distance from the arm tip to the center of star.
amplitude = 3;
% Get x and y coordinates of the arm tips.
x = amplitude .* cos(theta) + xCenter;
y = amplitude .* sin(theta) + yCenter;
% Draw it.
plot(x, y, 'b-', 'LineWidth', 2);
grid on;
axis square;
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/179017/image.jpeg)
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