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(PECL haru >= 0.0.1)
HaruPage::moveTextPos — Move text position to the specified offset
$x 
   ,  float $y 
   [,  bool $set_leading  = false 
  ] )
   Moves text position to the specified offset. If the start position of the current 
   line is (x1, y1), the start of the next line is (x1 + x, 
   y1 + y). 
  
x The specified text position offset.
y The specified text position offset.
set_leading 
       If set to  TRUE , the function sets the text leading to -y. 
      
   Returns  TRUE  on success.
  
发生错误时抛出 HaruException 异常。