绘制三次Bezier曲线的Actionscript？ [英] Draw cubic bezier curves in Actionscript?

问题描述

什么是绘制三次Bezier曲线编程在AS3的最佳方法是什么？该图形类似乎只支持二次曲线。 :(我希望能够做一些事情，如：

  VAR的startPoint：点=新的点（0，0）;
VAR端点：点=新的点（5,5）;
VAR控制1：点=新的点（5,0）;
VAR控制2：点=新的点（0,5）;

VAR myBezier：雪碧= getBezier（的startPoint，控制1，控制2，终点）;
 

有关为服务目标，我打算让〜50这些在舞台上的一次。

解决方案

  

注意：的Flash Player 11日起，包括一个本地方法来绘制三次曲线，<一个href="http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/display/Graphics.html#cubicCurveTo%28%29"相对=nofollow> cubicCurveTo（）这应该是最快的方法，如果你的目标FP11。

就在上周，我写了一个类来绘制任意阶Bezier曲线。

在code未优化，但在我的测试工作正常。业绩是做动画（虽然我不认为这是一个好主意，滥用它，因为正如我说这不是优化的接受事件，它没有任何意义的使用，当然这些对于二次曲线，因为玩家可以这样做本身）。

在code是在这里，如果你想使用它，或者看看：

的BezierCurve类

样品code

我想这与样品code，你将能够找出如何使用它没有麻烦（这是相当简单的，有点评论）;但是，如果你遇到问题，请走开！

随意使用它，你认为合适的。

What's the best way to draw cubic bezier curves programmatically in AS3? The Graphics class only seems to support quadratic curves. :( I want to be able to do something like:

var startPoint:Point = new Point(0, 0);
var endPoint:Point = new Point(5, 5);
var control1:Point = new Point(5, 0);
var control2:Point = new Point(0, 5);

var myBezier:Sprite = getBezier(startPoint, control1, control2, endPoint);

For a performance target, I'm planning on having ~50 of these on the stage at once.

解决方案

Note: Flash Player 11 onwards includes a native method to draw cubic curves, cubicCurveTo() which should be the fastest method if you are targeting FP11.

Just last week I wrote a class to draw Bezier curves of arbitrary order.

The code is not optimized but works fine in my tests. Performance is acceptable event for doing animations (although I don't think it's a good idea to abuse it, since as I said it's not optimized; it doesn't make sense to use these for quadratic curves, of course, since the player can do that natively).

The code is here if you want to use it or take a look:

The BezierCurve class

Sample code

I think that with the sample code you will be able to figure out how to use it without trouble (it's quite straight forward and somewhat commented); but if you run into problems, ask away!

Feel free to use it as you see fit.

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