Question

我是物理引擎的新手但是为了开始一个我想象的项目，我需要让六角形连续旋转到页面中心的固定位置。

我想我从根本上误解了物理引擎是如何工作的，但当我打电话给Matter.Body.rotate（hexagon，1）时;当由提供的参数（1）渲染时，它只是立即旋转六边形，并且不会再旋转六角形。如何让它连续旋转？

这是我的代码：

请注意，setStatic已设置为六边形不会脱离框架。

＆＃13;

// module aliases
var Engine = Matter.Engine,
    Render = Matter.Render,
    World = Matter.World,
    Bodies = Matter.Bodies;
    Composites = Matter.Composites;

// create an engine
var engine = Engine.create();

// create a renderer
var render = Render.create({
    element: document.body,
    engine: engine
});


var hexagon = Bodies.polygon(375, 300, 6, 200, {inertia: Infinity}); // setting inertia to inifinty will prevent rotation upon collision
Matter.Body.setStatic(hexagon, true);
Matter.Body.rotate(hexagon, 1);
console.log(hexagon);
// Matter.Body.rotate(hexagon, 1)

// add all of the bodies to the world
World.add(engine.world, [hexagon]);

// run the engine
Engine.run(engine);


// run the renderer
Render.run(render);

＆＃13;

<!DOCTYPE html>
  <head>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.5.11/p5.js"></script>
    <!-- <script src="matter.js" type="text/javascript"></script> -->
    <script src="https://cdnjs.cloudflare.com/ajax/libs/matter-js/0.12.0/matter.js"></script>
    <!-- <script async src="hexagondwana.js"></script> -->
    <script async src="hex_no_p5.js"></script>
  </head>
  <body>
  </body>
</html>

＆＃13;

Answer 1

您应该包含一个值，该值表示六边形的当前旋转速度和六边形旋转的速度。然后，使用循环更新以增加六角形的旋转，并使用Matter.Body.setAngle设置旋转。看起来像这样：

var hexagon = Bodies.polygon(375, 300, 6, 200, {
    isStatic: true,
    inertia: Infinity,// setting inertia to infinty will prevent rotation upon collision
    currentRotation: 0,
    rotationSpeed: 1
});
World.add(world, [hexagon]);  

function updateRotation() {
    hexagon.currentRotation += 1*hexagon.rotationSpeed;
    Matter.Body.setAngle(hexagon, hexagon.currentRotation);
    requestAnimationFrame(updateRotation);
}
window.requestAnimationFrame(updateRotation);

完整的代码在这里：

// module aliases
var Engine = Matter.Engine,
    Render = Matter.Render,
    World = Matter.World,
    Body = Matter.Body,
    Bodies = Matter.Bodies;
    Composites = Matter.Composites;

// create an engine
var engine = Engine.create();

// create a renderer
var render = Render.create({
    element: document.body,
    engine: engine
});



var hexagon = Bodies.polygon(375, 300, 6, 200, {
    isStatic: true,
    inertia: Infinity,// setting inertia to infinty will prevent rotation upon collision
    currentRotation: 0,
    rotationSpeed: 1
}); 
// add all of the bodies to the world
World.add(engine.world, [hexagon]);

// run the engine
Engine.run(engine);

function updateRotation() {
    hexagon.currentRotation += 1*hexagon.rotationSpeed;
    Body.setAngle(hexagon, hexagon.currentRotation);
    requestAnimationFrame(updateRotation);
}
window.requestAnimationFrame(updateRotation);



// run the renderer
Render.run(render);

<!DOCTYPE html>
  <head>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.5.11/p5.js"></script>
    <!-- <script src="matter.js" type="text/javascript"></script> -->
    <script src="https://cdnjs.cloudflare.com/ajax/libs/matter-js/0.12.0/matter.js"></script>
    <!-- <script async src="hexagondwana.js"></script> -->
    <script async src="hex_no_p5.js"></script>
  </head>
  <body>
  </body>
</html>

如何用matter.js连续旋转身体？

1 个答案: