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on 12 Nov 2023
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drawframe(1);
Write your drawframe function below
function drawframe(f)
%declare some functions and variables to save characters
persistent u n b q S X1 X M a t r l1 l2 l3 i1 i2 z a2
if f==1
u=@linspace;
n=@rescale;
b=@circshift;
q=400;
%%make a sky gradient
S=[0 .42 .85
.88 .92 .95];
X1=u(1,255,200); %vector for colourmap
M=repmat(X1,q,1); %sky matrix (gradient)
a=1.60;
X=u(-1,1,q); %create linear r matrix
[t,r]=cart2pol(X,X'); %create polar coord matrices of r and theta
l1=d(r,a); %generate 3 cloud layers using function
l2=d(r,a);
l3=d(r,a);
i1=round(u(1,q,48)); %create 2 sets of indices for slow and fast moving cloud layers
i2=round(u(1,800,48));
z=256*ones(q,q); %white sky colour)
m=0;
for k=1:48
a1(:,:,1)=n(l1,-2,2.5); %first cloud layer doesn't move
a1(:,:,2)=n(b(l2,i2(k),2),-2,4); %second cloud layer traverses the image once
a1(:,:,3)=n(b(l3,i1(k),2),-2,2.5); %third cloud layer traverses the image twice
a2(:,:,k)=min(a1,[],3); %blend 3 cloud layers using a max function
end
a2=n(a2,0,3);
end
%generate colourmap by interpolating between 2 colour points in R, G and B,
%white in position 256. black in 257
colormap([interp1([0 255], S, [0:1:255]); 1 1 1; 0 0 0]);
M2=M'.*(a2(201:400,:,f))+(1-a2(201:400,:,f)).*z(201:400,:); %blend alpha cloud layer with sky layer
MS=flipud(M2);
D=flip(M2);
for k1=1:200
M2=[M2;circshift(D(k1,:,:),round(8*randn),2)];
end
image(M2)
axis equal
axis off
camva(4)
function c=d(r,a)
c=rescale(abs(ifft2(fftshift(fft2(rand(400))).*(r.^-a))),0,1).^1.1; %function to create clouds
end
end
Animation
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