(PECL haru >= 0.0.1)
HaruPage::setTextMatrix — Set the current text transformation matrix of the page
$a
   , float $b
   , float $c
   , float $d
   , float $x
   , float $y
   )Defines the text transformation matrix of the page.
a
     Width multiplier.
b
     Vertical skew in radians.
c
     Horizontal skew in radians.
d
     Height multiplier.
x
     Horizontal position for text.
y
     Vertical position for text.
   Returns TRUE on success.
  
发生错误时抛出 HaruException 异常。