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• # Graph Equation of Diamond Ring

on 2 Dec 2023
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drawframe(1);
Write your drawframe function below
% Graph Equation of Diamond Ring using Implicit Function in Cartesian Space
% Dhimas Mahardika S.Si., M.Mat
% Sanggung Utara, Jatingaleh, Candisari, Semarang
% UNDIP Tembalang
% Wedding Ring by Dhimas Mahardika S.Si.,M.Mat
function drawframe(f)
global theta1 theta2 theta3 heartHdl star1Hdl star2Hdl hpnts sx1 sx2 sy1 sy2
if f==1
% 所需匿名函数
col1Func=@(n) repmat([255,158,196]./255,[n,1])+repmat([-39,-81,-56]./255,[n,1]).*repmat(rand([n,1]),[1,3]);
col2Func=@(n) repmat([118,156,216]./255,[n,1])+repmat([137,99,39].*.1./255,[n,1]).*repmat(rand([n,1]),[1,3]);
szFunc=@(n) rand([n,1]).*15+8;
hold on
% 计算爱心点位置并绘制爱心
n=120;
x=linspace(-30,30,n);
y=linspace(-30,30,n);
z=linspace(-30,40,n);
[X,Y,Z]=ndgrid(x,y,z);
F= (Y.^2 + (sqrt(X.^2+Z.^2) - 18).^2 - 5)...
.* (abs(X)+ abs((Z-27)) +abs(Y)-8);
FV=isosurface(F,0);
hpnts=FV.vertices;
hpnts=(hpnts-repmat(mean(hpnts),[size(hpnts,1),1])).*repmat([.75,.7,.7],[size(hpnts,1),1]);
hpnts=hpnts+rand(size(hpnts)).*.7;
heartHdl=scatter3(hpnts(:,1),hpnts(:,2),hpnts(:,3),'.','SizeData',5,'CData',col1Func(size(hpnts,1)));
% 计算星星位置并绘制星星
sx1=rand([2e3,1]).*120-60;
sy1=rand([2e3,1]).*120-60;
sz1=ones(size(sx1)).*-30;
star1Hdl=scatter3(sx1,sy1,sz1,'.','SizeData',szFunc(length(sx1)),'CData',col2Func(size(sx1,1)),'LineWidth',1);
sx2=rand([2e3,1]).*120-60;
sy2=rand([2e3,1]).*120-60;
sz2=rand([2e3,1]).*120-20;
star2Hdl=scatter3(sx2,sy2,sz2,'.','SizeData',szFunc(length(sx2)),'CData',[1,1,1]);
% 坐标区域修饰
ax=gca;
ax.XLim=[-35,35];
ax.YLim=[-35,35];
ax.ZLim=[-35,35];
ax.Projection='perspective';
ax.DataAspectRatio=[1,1,1];
view(30,20);
ax.Color=[0,0,0];
ax.XColor='none';
ax.YColor='none';
ax.ZColor='none';
set(ax,'LooseInset',[0,0,0,0]);
set(ax,'Position',[-1/5,-1/5,1+2/5,1+2/5])
set(gcf,'Color',[0,0,0]);
% text(0,0,20,'slandarer','Color','w','HorizontalAlignment','center')
% 旋转爱心和星星
theta1=0;theta2=0;theta3=0;
else
theta1=theta1-pi/48;
theta2=theta2-0.003;
theta3=theta3-0.02;
set(heartHdl,'XData',hpnts(:,1).*cos(theta1)-hpnts(:,2).*sin(theta1),...
'YData',hpnts(:,1).*sin(theta1)+hpnts(:,2).*cos(theta1))
set(star1Hdl,'XData',sx1.*cos(theta2)-sy1.*sin(theta2),...
'YData',sx1.*sin(theta2)+sy1.*cos(theta2))
set(star2Hdl,'XData',sx2.*cos(theta3)-sy2.*sin(theta3),...
'YData',sx2.*sin(theta3)+sy2.*cos(theta3))
end
end
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