function incPosX($posX)
    {
        $oldX = $this->posX;
        $this->posX += $posX;
        $this->onMove($oldX, $this->posY, $this->posZ);
    }
function incPosX($posX)
    {
        $oldX = $this->posX;
        $this->posX += $posX;
        $this->onMove($oldX, $this->posY, $this->posZ);
    }
function incPosX ( $ posX ) { $ oldX = $ this -> posX ; $ this -> posX += $ posX ; $ this -> onMove ( $ oldX , $ this -> posY , $ this -> posZ ) ; }
Increment position X
@param float
Increment position X