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on 14 Oct 2024
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Cite your audio source here (if applicable): Audio generated by MATLAB
Borrowing code from a couple of memorable minihacks from years past:
Happy Sheep by Victoria:
https://www.mathworks.com/matlabcentral/discussions/tips/847476-how-to-draw-a-happy-sheep-in-matlab
Cloudy bits in tractor beam by Jenny:
https://www.mathworks.com/matlabcentral/communitycontests/contests/4/entries/4211
function drawframe(f)
persistent T C S Sc ST zr
if f==1 || isempty(T)
%% Starry Night Sky
% Borrowed from lonely lighthouse from last year
rng(0)
imagesc([-1 1],[0 1],(1:256)');
colormap(gca,abyss.^2) % square to get more black, but it made the blue niftier too
hold on
N=120;
si=rand(1,N); % Size and Color are related, so use same random #s
scatter(rand(1,N)*2-1,rand(1,N),(si+.2)*40,(si*.5+.5)'.*[1 1 1],'Marker','.');
set(gca,'pos',[0 0 1 1]);
axis([-1 1 0 1]);
%% Flying Saucer
axes('pos',[0 0 1 1],'clipping','off'); % 3D axes for animation
T=hgtransform;
% Handy sphere
[X,Y,Z]=sphere(50);
% Ship body
surface(T,X*1.5,Y*1.5,Z*.4,'FaceColor','#bbc','EdgeColor','none');
% Glass Dome
surface(T,X*.5,Y*.5,abs(Z),'FaceColor','#5ff','EdgeColor','none');
zr=0; % saucer rotates - this trax where.
lighting g
%% Beam of Light
C=hgtransform(T,'vis','off');
[cX,cY,cZ] = cylinder;
% Light Beam Cylinder
surface(C,cX.*[.3;.9],cY.*[.3;.9],cZ*-1,'FaceColor','w','EdgeColor','none',...
...'FaceAlpha','interp','AlphaData',cZ+[.1;-.5]);
'FaceAlpha','texture','AlphaData',clouds);
alphamap(0:.01:.5);
%% A sheep to abduct
% Shamelessly borrow Victoria's "Happy Sheep" because it is awesome.
S=hgtransform(T,'vis','off');
Sc=[.05 .3 1];
ST=hgtransform(S,'Matrix',makehgtform('scale',Sc));
happysheep(ST);
% Axes Decoration
view(0, 10);
axis([-5 5 -5 5 1 11],'off','vis3d');
camlight
end
%% Transform objects to tell a story!
% commands are very wordy. Shorten.
tf=@makehgtform;
tft=@(m)tf('translate',m);
tfs=@(m)tf('scale',m);
zr=zr+.2;
tfz=@(m)tf('zrotate',zr);
if f<21
T.Matrix = tft([-(20-f)/2 0 9]);
elseif f<25
C.Visible = 'on';
C.Matrix = tfs([1 1 (f-21)/4*10+2])*tfz();
elseif f<73
S.Visible = 'on';
r=(f-73)/24;
S.Matrix = tft([0 0 r*5]);
ST.Matrix = tfs(Sc.*[(.8-r)*.5 1 (.8-r)*2]);
C.Matrix = tfs([1 1 10])*tfz();
elseif f<77
S.Visible = 'off';
C.Visible = 'on';
C.Matrix = tfs([1 1 5-(f-75)/4*10])*tfz();
else
C.Visible = 'off';
T.Matrix = tft([10-(96-f)/2 0 9]);
end
end
function M=clouds()
% A short code snippet from Jenny's cloudy sky from 300char minihack.
% https://www.mathworks.com/matlabcentral/communitycontests/contests/4/entries/4211
X=-164:.646:164;
[~,r]=cart2pol(X,X'-60);
M=1.5E4*abs(ifft2(r.^-1.65.*cos(6*rand(508))));
end
function happysheep(parent)
% Happy Sheep!
% By Victoria A. Sablina
% https://www.mathworks.com/matlabcentral/discussions/tips/847476-how-to-draw-a-happy-sheep-in-matlab
% Handles
s=@sin;
c=@cos;
% Ellipse + Rose
F=@(t,a,f) a(1)*f(t)+s(a(2)*t).*f(t)+a(3);
% Angles
t=0:.1:7;
% Parameters
% Head (1:2)
% Eyes (3:6)
% Hoofs (7:14)
% Crown (15:16)
% Body (17:18)
% Tail (19:20)
G=-13;
P=[5 7 repmat([.1 .5],1,6) 6 4 14 9 3 3;zeros(1,14) 8 8 12 12 4 4;...
-15 2 G 3 -17 3 -3 G 0 G 9 G 12 G -15 12 4 3 20 7];
% Painting
for i=1:10
% plot(F(t,P(:,2*i-1),c),F(t,P(:,2*i),s),'LineWidth',10);
% Use same trick, but create filled patch
p=fill(parent,F(t,P(:,2*i-1),c),F(t,P(:,2*i),s),'w');
p.FaceLighting = 'none';
if any(i==(2:7))
% Make the hooves more visible against night sky
p.LineWidth=2.5;
p.EdgeColor='#883';
else
p.LineWidth=.5;
p.EdgeColor='#222';
end
end
end
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