(PECL haru >= 0.0.1)
HaruPage::curveTo — Append a Bezier curve to the current path
$x1
   , float $y1
   , float $x2
   , float $y2
   , float $x3
   , float $y3
   )Append a Bezier curve to the current path. The point (x1, y1) and the point (x2, y2) are used as the control points for a Bezier curve and current point is moved to the point (x3, y3).
x1
     A Bezier curve control point.
y1
     A Bezier curve control point.
x2
     A Bezier curve control point.
y2
     A Bezier curve control point.
x3
     The current point moves here.
x3
     The current point moves here.
   Returns TRUE on success.
  
发生错误时抛出 HaruException 异常。