linep.m

使用matlab

function linep(x,y,r,a,b)
x1=x+r*cos(pi*((90+72*(a-1))/180));
x2=x+r*cos(pi*((90+72*(b-1))/180));
y1=y+r*sin(pi*((90+72*(a-1))/180));
y2=y+r*sin(pi*((90+72*(b-1))/180));

x3=min(x1,x2):0.01:max(x1,x2);
y3=(y2-y1)/(x2-x1)*(x3-x1)+y1;
plot(x3,y3,'w');