Why won't my lines move?
<p>Okay, so I'm calling a function that draws three lines to display an 'I' on-screen.
Then, I call another function which calls this function, but adds 1 to the x variable to
make a the letter bold. Then I want to put x++ add in the 'tick' function, which executes
every frame. It isn't working, but why? If you don't understand what I mean, please check this page, it's the tutorial I'm following: <a href="http://www.devmaster.net/articles/intro-to-c++-with-game-dev/part3.php" rel="nofollow">http://www.devmaster.net/articles/intro-to-c++-with-game-dev/part3.php</a></p>

<p>Declare global x and y and call function tick:</p>

<pre><code>int x = 0;
int y = 0;
void Game::Tick( float a_DT )
{
    m_Screen-&gt;Clear( 80 );
    DrawI(0,0);
    x++;
}
</code></pre>

<p>Making functions:</p>

<pre><code>void Game::DrawI(int x, int y)
{
    m_Screen-&gt;Line( 100 + x, 50 + y, 200 + x, 50 + y, 0xffffff );
    m_Screen-&gt;Line( 150 + x, 50 + y, 150 + x, 300 + y, 0xffffff );
    m_Screen-&gt;Line( 100 + x, 300 + y, 200 + x, 300 + y, 0xffffff );
}

void Game::DrawFatI()
{
    DrawI(1,0);
    DrawI(0,1);
    DrawI(0,0);
    DrawI(1,1);
}
</code></pre>

<p>Thanks for checking.</p>
