When drawing lines or curves with ActionScript, the first thing you must do is define the line style, as shown in Recipe 4.1.
Once you have set a line style,
you can draw a curve using the
curveTo( ) method. The
) method draws an approximation of a Bézier
curve (though optimized for performance), which requires three
points: a starting point, a control point, and a destination point.
The starting point is always determined by the current pen position.
The destination point is simply the point on the canvas to which you
wish to draw. The control point is the point that determines the
shape of the curve; it is calculated by determining where the
tangents to the curve at the starting and destination points
intersect. The control point is not actually on the curve, as shown
in Figure 4-1.
This simple example draws a curve:
// Draw a curved line in
myMovieClip_mcwith a control point at (0,100) and a // destination point of (100,100). this.createEmptyMovieClip("myMovieClip_mc", 1); myMovieClip_mc.lineStyle(1, 0x000000, 100); myMovieClip_mc.curveTo(0, 100, 100, 100);