title: what does "this.x = x < 0? 0 : x; this.y = y < 0? 0 : y;" mean?
body: <p>I have no idea what does this mean:</p>
  
  <pre><code>this.x = x &lt; 0 ? 0 : x;
  this.y = y &lt; 0 ? 0 : y;
  </code></pre>
  
  <p>I could not find the meaning of these operators, any help will be greatly appreciated!</p>