Drawing a star with n points

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James Connor 2015-10-16

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/249038-drawing-a-star-with-n-points

评论： Adam Danz 2021-3-25

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.

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Maria Koneva 2020-6-11

Sounds like python

Adam Danz 2021-3-25

See createStarVertices() on the file exchange where you can set

number of rays
center point
inner and outer diameters
orientation

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Answer 1

Image Analyst 2015-10-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/249038-drawing-a-star-with-n-points#answer_196257

Did you search the forum: http://www.mathworks.com/matlabcentral/answers/32786-six-pointed-star

Attached are my only two star demos. You're welcome to adapt them.

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James Connor 2015-10-18

Hey I'm not really sure what to modify on your code to turn it into a regular star? Thanks for the help

Image Analyst 2015-10-18

编辑：Image Analyst 2015-10-18

在 MATLAB Online 中打开

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;