in the image. The pixel itself is a unit lenght square box centered around this location i.e. represented by <code>fBox2( i-0.5f, i+0.5f, j-0.5f, j+0.5f)</code>. The whole image corresponds to the (floating point valued) box <code>fBox2( -0.5f, lx - 0.5f, -0.5f, ly - 0.5f)</code>.</li>
</ul>
</dd></dl>
<p>Vectors and boxes support all the usual operations: arithmetics (addition, dot product..), copy, type conversion...</p>
<p >Most drawing methods take vectors and boxes as input parameters instead of scalar