(PECL haru >= 0.0.1)
HaruPage::rectangle — Append a rectangle to the current path
$x
   , float $y
   , float $width
   , float $height
   )Appends a rectangle to the current drawing path.
x
     The left border of the rectangle.
y
     The lower border of the rectangle.
width
     The width of the rectangle.
height
     The height of the rectangle.
   Returns TRUE on success.
  
发生错误时抛出 HaruException 异常。