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on 13 Nov 2023
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drawframe(1);
Write your drawframe function below
function drawframe(f)
%% Hack so last frame is first frame making our icon look compelling
f = mod(f-2,48)+1;
%% Rose Part
%openness = min((f-1)/40,1.02); - too simple
% Add some bounce...
openness = 1.05-cospi(f/(48/2.5)).*(1-f/48).^2;
opencenter = openness*.2;
pnum = 3.6;
nr = 30;
pr = 10;
B = 1.27689;
np = 40;
petalsep = 5/4;
% How much rotation in radians is one petal?
% pnum is # petals in 2pi.
petalTheta = (1/pnum) * pi * 2;
% Number of data points to draw
% np = number of petals
% pr = thetapetalresolution (# of pts per petal in theta)
% +1 since we need 1 more pt to finish the sequence.
nt = np * pr + 1;
r=linspace(0,1,nr);
theta=linspace(0, np*petalTheta,nt);
[R,THETA]=ndgrid(r,theta);
M = (1 - mod(pnum*THETA, 2*pi)/pi);
x = 1 - (petalsep*M.^2 - 1/4).^2 /2;
phi = (pi/2)*linspace(opencenter,openness,nt).^2;
y = 1.995*(R.^2).*(B*R - 1).^2.*sin(phi);
R2 = x.*(R.*sin(phi) + y.*cos(phi));
X=R2.*sin(THETA);
Y=R2.*cos(THETA);
Z=x.*(R.*cos(phi)-y.*sin(phi))*1;
C=hypot(hypot(X,Y), Z*.9);
surf(X,Y,Z,C, FaceC='i', EdgeC='n');
%% Decorations
set(gcf,'color', 'w');
% When closed, black base looked dumb, so start out full red
% everywhere, and as it opens, add in the black to give it depth.
colormap( [ linspace((48-f)/48,1,256).^2; zeros(1,256); zeros(1,256)]' );
daspect([1 1 1])
axis([-1 1 -1 1 -.5 1], 'off')
set(gca,'clipping','off')
camzoom(1.6)
camorbit(-f*3,0)
end
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