How to create triangle and animate it?

Question

Ron 2020-9-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/587603-how-to-create-triangle-and-animate-it

评论： Rena Berman 2020-10-8

I'm using this code to start but hasnt worked. patch command is giving error and not sure how to resolve it. Please help.

w0 = 1 ;

w1 = 0.5 ;

N = 5 ;

ww = linspace(w1,w0,N) ;

W = [fliplr(ww) ww] ;

ar=0.866; % Aspect ratio for equilateral triangle

h=ar*W;%height of triangle

for i = 1:length(W)

x=[0 W W/2];%x coordinates of vertices

y=[0 0 h];%y coordinates of vertices

patch(x,y,'white')

set(gca,'Color','k','xticklabel',[],'yticklabel',[])

drawnow

pause(0.1)

end

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Rik 2020-10-3

在 MATLAB Online 中打开

Question originally posted by JD recovered from Google cache:

I'm using this code to start but hasnt worked. patch command is giving error and not sure how to resolve it. Please help.

w0 = 1 ;
w1 = 0.5 ;
N = 5 ;
ww = linspace(w1,w0,N) ;
W = [fliplr(ww) ww] ;
ar=0.866; % Aspect ratio for equilateral triangle
h=ar*W;%height of triangle
for i = 1:length(W)
x=[0 W W/2];%x coordinates of vertices
y=[0 0 h];%y coordinates of vertices
patch(x,y,'white')
set(gca,'Color','k','xticklabel',[],'yticklabel',[])
drawnow
pause(0.1)
end

Rena Berman 2020-10-8

(Answers Dev) Restored edit

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Answer 1

Ameer Hamza 2020-9-2

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/587603-how-to-create-triangle-and-animate-it#answer_488246

在 MATLAB Online 中打开

Try this

w0 = 1 ;
w1 = 0.5 ;
N = 5 ;
ww = linspace(w1,w0,N) ;
W = [fliplr(ww) ww] ;
ar=0.866; % Aspect ratio for equilateral triangle
h=ar*W;%height of triangle
fig = figure();
ax = axes();
set(ax,'Color','k','xticklabel',[],'yticklabel',[])
ax.XLim = [0 1];
ax.YLim = [0 1];
p = patch([0 0 0], [0 0 0], 'w');
for i = 1:length(W)
    
    x = [0 W(i) W(i)/2];%x coordinates of vertices
    y = [0 0 h(i)];%y coordinates of vertices
    
    p.Vertices = [x.' y.'];
    
    drawnow
    pause(0.1)
    
end

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Ron 2020-9-2

Thank you so much! Very helpful!

Also, is it possible to add multiple triangles (say 20) to this, instead of 1.

Ameer Hamza 2020-9-2

在 MATLAB Online 中打开

I am glad to be of help!

Try this

w0 = 1 ;
w1 = 0.5 ;
N = 5 ;
ww = linspace(w1,w0,N) ;
W = [fliplr(ww) ww] ;
ar=0.866; % Aspect ratio for equilateral triangle
h=ar*W;%height of triangle
n = 200; % number of triangles
area = 20; % 10x10 square for all the triangles
triangle_locations = area*rand(n, 2); % location of triangles
fig = figure();
ax = axes();
set(ax,'Color','k','xticklabel',[],'yticklabel',[])
ax.XLim = [0 area];
ax.YLim = [0 area];
p = gobjects(1, n);
for i=1:n
    p(i) = patch([0 0 0], [0 0 0], 'w');
end
for i = 1:length(W)
    for k = 1:n
        x = [0 W(i) W(i)/2] + triangle_locations(k, 1);%x coordinates of vertices
        y = [0 0 h(i)] + triangle_locations(k, 2);%y coordinates of vertices
        p(k).Vertices = [x.' y.'];
    end
    pause(0.1)
end