How to shift image ?

I want to copy an area of image from left to right to make it looks like it "grow" from left to right. So I wrote the following codes :

int n = 300;
while( n > 0 )
{
      g.copyArea(n, 0, 3, 50, 3, 0);
      n = n-3;
}

And I already draw lines at 0,0 to 3,50. It should reduplicate that image once when I call the above loop. But it just can't work, it doesn't duplicate anything at all !

But if I change the logic of loop to:

int n = 0;
while( n > 300)
{
      g.copyArea(n, 0, 3, 50, 3, 0);
      n = n+3;
}

Then it can work, and show me a lines of image, duplicated from the left hand side.

Why such happened ? What's wrong of my code or logic ?

Please help me !! Thank you very much !! ( Urgent ! )
c.w.yuenAsked:
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majklCommented:
int n = 0;
             while( n > 300)
             {
             g.copyArea(n, 0, 3, 50, 3, 0);
             n = n+3;
             }

this loops never loops.
n = 0 and while n > 300
statement is everytime false :)


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