该站点上的代码示例是 Haxe,而不是 ActionScript,它解释了您在添加“包”时遇到的错误。
这是 ActionScript 类的修改版本:
package{
import flash.display.Graphics;
import flash.display.Sprite;
import flash.events.Event;
import flash.events.MouseEvent;
import flash.display.StageQuality;
import nape.space.Space;
import nape.space.UniformSleepSpace;
import nape.util.Tools;
import nape.geom.Vec2;
import nape.geom.GeomPoly;
import nape.phys.PhysObj;
import nape.phys.Material;
import nape.geom.AABB;
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
public class Main extends Sprite
{
private var space:Space;
private var g:Graphics;
private var vl:Array;
private var px:Number; private var py:Number;
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
private function mouseDown(ev:MouseEvent):void {
var x = stage.mouseX;
var y = stage.mouseY;
g.lineStyle(1, 0, 0.5);
vl.push(new Vec2(x, y));
g.moveTo(x, y);
px = x; py = y;
}
private function mouseUp(ev:MouseEvent):void {
if (vl.length >= 3) {
var poly = new GeomPoly(vl);
poly.simplify(50, 4);
if (!poly.selfIntersecting()) {
if (!poly.cw()) poly.points.reverse();
var p = Tools.createConcave(poly, 0, 0, 0, false, Material.Wood);
space.addObject(p);
addChild(p.graphic);
}
}
g.clear();
vl = new Array();
px = -100;
}
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
public function init(ev:Event = null)
{
var s = new Sprite();
g = s.graphics;
addChild(s);
s.cacheAsBitmap = true;
vl = new Array();
px = -100;
space = new UniformSleepSpace(new AABB(0,0, 800,600), 30, new Vec2(0, 250));
var p:PhysObj;
space.addObject(p = Tools.createBox(-20, 300, 50, 600, 0, 0, 0, true, Material.Wood));
addChild(p.graphic);
space.addObject(p = Tools.createBox(820, 300, 50, 600, 0, 0, 0, true, Material.Wood));
addChild(p.graphic);
space.addObject(p = Tools.createBox(400, -20, 800, 50, 0, 0, 0, true, Material.Wood));
addChild(p.graphic);
space.addObject(p = Tools.createBox(400, 620, 800, 50, 0, 0, 0, true, Material.Wood));
addChild(p.graphic);
stage.quality = StageQuality.MEDIUM;
stage.addEventListener(MouseEvent.MOUSE_DOWN, mouseDown);
stage.addEventListener(MouseEvent.MOUSE_UP, mouseUp);
stage.addEventListener(Event.ENTER_FRAME, enterFrame);
}
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
private function enterFrame(ev:Event) {
graphics.clear();
graphics.lineStyle(1, 0, 1);
if (px != -100) {
var x = stage.mouseX;
var y = stage.mouseY;
var dx = x - px; var dy = y - py;
if (dx * dx + dy * dy > 5) {
vl.push(new Vec2(x, y));
px = x; py = y;
g.lineTo(x, y);
}else {
graphics.moveTo(px, py);
graphics.lineTo(x, y);
}
}
space.step(1/60, 6, 6);
}
}
}
这是时间线代码:
import flash.Boot;
new Boot();
var m:Main = new Main();
m.addEventListener(Event.ADDED_TO_STAGE, m.init);
addChild(m)
对于此设置,您的 fla 应为 800x600,frameRate 为 60。另外,请注意我已将构造函数更改为 init 方法。这是因为在此访问阶段,并且在将 Main 的实例添加到阶段之前,对阶段的引用将为空。
对于刚接触编程的人来说,混合 AS3 和 Haxe 并不容易。如果你对 Haxe 感兴趣,那就去吧,否则,为了更简单的 2D 物理,我建议你试试Box2D World Construction Kit。它允许您直接在 IDE 中使用组件定义轻松地对世界进行原型制作,并且它应该比直接 AS3 端口快一点,因为它使用的是 Alchemy。

此外,在gotoAndLearn上还有一个免费的介绍性视频教程可以帮助您入门。
祝你好运!