clc;
clear;
hold on;
axis([-100,100,-100,100]);
plot(-100:100,0,'r.');
plot(0,-100:100,'b.');
x1=input('X1= ');
y1=input('Y1= ');
x2=input('X2= ');
y2=input('Y2= ');
dx=x2-x1;
dy=y2-y1;
if (dx==0 && dy~=0)
x=x1;
y=y1:sign(dy):y2;
plot(x,y,'g.');
elseif (dx~=0 && dy==0)
y=y1;
x=x1:sign(dx):x2;
plot(x,y,'g.');
elseif abs(dy/dx)==1
x=x1:sign(dx):x2;
y=y1:sign(dy):y2;
plot(x,y,'g.');
else
msgbox 'Not Standard Line';
end
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