Update BaseDrawing.php

[sarciszewski]

Avoid division by zero

[CiTRO33]

Hey, there is also a "bug" in this file:
the function setWidthAndHeight works only if resizeProportional is true:

in my opinion this must be work:

public function setWidthAndHeight($width = 0, $height = 0) {
if ($this->_resizeProportional && ! ($width == 0 || $height == 0)) {
$xratio = $width / $this->_width;
$yratio = $height / $this->_height;
if (($xratio * $this->_height) < $height) {
$this->_height = ceil ( $xratio * $this->_height );
$this->_width = $width;
} else {
$this->_width = ceil ( $yratio * $this->_width );
$this->_height = $height;
}
} else {
$this->_width = $width;
$this->_height = $height;
}
return $this;
}

[MarkBaker]

Thanks