正确使用 Physics.aabb.union()

Question

我正在学习 PhysicsJS, and I tried using union 像这样：

// Window bounds
var rect1 = Physics.aabb(0, 100, 300, 200);
var rect2 = Physics.aabb(100, 0, 200, 300);
var viewportBounds = Physics.aabb.union(rect1, rect2);

// Constrain bodies to these bounds
world.add(Physics.behavior('edge-collision-detection', {
  aabb: viewportBounds,
  restitution: 0.99,
  cof: 0.99
}));

但是球刚从底部掉下来。

Physics(function(world){

  var viewWidth = 300;
  var viewHeight = 300;

  var renderer = Physics.renderer('canvas', {
    el: 'viewport',
    width: viewWidth,
    height: viewHeight,
    meta: false
  });

  // add the renderer
  world.add(renderer);
  // render on each step
  world.subscribe('step', function(){
    world.render();
  });

  // Window bounds
    var rect1 = Physics.aabb(0, 100, 300, 200);
    var rect2 = Physics.aabb(100, 0, 200, 300);
    var viewportBounds = Physics.aabb.union(rect1, rect2);
  
  // Constrain bodies to these bounds
  world.add(Physics.behavior('edge-collision-detection', {
      aabb: viewportBounds,
      restitution: 0.99,
      cof: 0.99
  }));

  // Add the ball
  world.add(
      Physics.body('circle', {
        x: 0, // x-coordinate
        y: 0, // y-coordinate
        vx: 0.2, // x-velocity
        vy: 0.01, // y-velocity
        radius: 2.0
      })
  );

  // ensure objects bounce when edge collision is detected
  world.add( Physics.behavior('body-impulse-response') );

  // add some gravity
  world.add( Physics.behavior('constant-acceleration') );

  // subscribe to ticker to advance the simulation
  Physics.util.ticker.subscribe(function( time, dt ){

      world.step( time );
  });

  // start the ticker
  Physics.util.ticker.start();

});

body {
  /*background: #121212;*/
}
.pjs-meta {
  display: none;
}

#viewport {
  border: 1px solid #666;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src='http://wellcaffeinated.net/PhysicsJS/assets/scripts/vendor/physicsjs-0.5.0/physicsjs-full-0.5.0.min.js'></script>

<canvas id="viewport" width="300" height="300"></canvas>

我在 GitHub 上或任何使用它的地方都找不到任何代码。有人可以提供一些指导吗？

Answer 1

I can't find any code on GitHub or anywhere using it. Can someone lend some guidance, please?

您可以尝试阅读 unit tests in the .spec, on Github。

示例测试，即使几乎不了解也应该看起来非常可读 Javascript:

it("should initialize provided a width/height and point", function() {
    var aabb = Physics.aabb( 4, 5, { x: 20, y: 9 } );
    matches( aabb, { x: 20, y: 9, hw: 2, hh: 2.5 });
});

spec.js 看起来是测试代码。测试实际上兼作文档，像 spec 这样的库可以使测试代码 read 像文档一样。此外，测试代码当然是如何使用代码的示例集合。享受吧。

Try reading other test code.

Answer 2

想通了。我当时使用的是超旧版本 (physicsjs-0.5.0). I linked to the latest version (physicsjs-0.7.0)，它具有多的功能（这两个版本之间有 4,088 行新代码）。我不得不稍微重构我的代码以匹配更新后的规范，但一切都很好！

正确使用 Physics.aabb.union()

Proper use of Physics.aabb.union()

javascript

aabb

physicsjs