Simulation Moving Object problem

Question

engineerOfPhysics 2013-5-15

0
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https://ww2.mathworks.cn/matlabcentral/answers/75863-simulation-moving-object-problem

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Hello guys !!!!!!

for ax=1:1:100

if ax<10

c=line(x6+ax,y6+ax*tan(30*pi/180));

b=line(x5+ax,y5+ax*tan(30*pi/180));

a=line(x4+ax,y4+ax*tan(30*pi/180));

pause(0.1)

delete(a,b,c)

   else
       ax=-ax;
       c=line(x6+ax,y6+ax*tan(30*pi/180));   
       b=line(x5+ax,y5+ax*tan(30*pi/180)); 
       a=line(x4+ax,y4+ax*tan(30*pi/180));

pause(0.1)

delete(a,b,c)

   end
end

I need some help. I tried to moved an object I created with three lines as you see ( written above is just a part of real code). My aim is that object will move to some direction then after a condition it will be back. But when I try the code it moves firstly there is no problem then when the condition will be active I expected that object changes the direction to back but the objcet suddenly will be at the starting point then moves to the back direction.

I do not understand where is the problem.

Thanks for all body !!