function pushbuttonSanjiao_Callback(hObject, eventdata, handles)               % Three Angle


A=handles.dataA
F=handles.dataF
C=handles.dataC/180*pi
Ts=1.0/F;
FS=500;
dt=1/FS;
for  k=1:4000
    nt=k*dt+C;
    i=floor(nt/Ts);
    t1=nt-i*Ts;
    if mod(i,2)==0
       y(k)=-A+2*A*t1/Ts;
    else  y(k)=A-2*A*t1/Ts;
    end
    t(k)=k*dt;
end
plot(t,y);
axis([0 8 -1.2 1.2]);
grid on