需要Matter.js计算力 [英] Matter.js calculating force needed

问题描述

我正在尝试对物体施加力.要使其以我的鼠标位置相对于该对象生成的角度移动.

Im trying to apply a force to an object. To get it to move in the angle that my mouseposition is generating relative to the object.

我有角度

 targetAngle = Matter.Vector.angle(myBody.pos, mouse.position);

现在，我需要施加力，以使身体沿该角度移动.我在下面的applyForce方法中输入什么值?

Now I need to apply a force, to get the body to move along that angle. What do I put in the values below for the applyForce method?

  // applyForce(body, position, force)

  Body.applyForce(myBody, {
    x : ??, y : ??
  },{
    x:??, y: ?? // how do I derive this force??
  });

如何在此处输入x和y值，以使主体沿鼠标和主体之间的角度移动.

What do I put in the x and y values here to get the body to move along the angle between the mouse and the body.

推荐答案

您可以依赖 Matter.Vector 模块并将其用于减去，归一化和乘以位置矢量:

You can rely on the Matter.Vector module and use it to substract, normalize and multiply positions vectors:

var force = 10;
var deltaVector = Matter.Vector.sub(mouse.position, myBody.position);
var normalizedDelta = Matter.Vector.normalise(deltaVector);
var forceVector = Matter.Vector.mult(normalizedDelta, force);
Body.applyForce(myBody, myBody.position, forceVector);

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