笛卡尔心形线

Matlab代码：

close all; 
alpha = -pi : pi/50 : pi; 
x = 2*cos(alpha);
y = 2*sin(alpha);
for p=1:length(x)
        alpha1 = -pi : pi/100 : pi; 
        x1 = 1*cos(alpha1);
        y1 = 1*sin(alpha1);
        hold on;
        plot(x(1,p)+x1,y(1,p)+y1-1,'g');
end
axis off; 
hold on;  
theta = -pi: pi/50 :pi; 
rho = 2*(1-sin(theta));  
polar(theta,rho,'* r');%画红色心形线
axis off;