使用Paper.js检测当前旋转 [英] Detecting current rotation with Paper.js

问题描述

我正在使用 Paper.js 制作小型游戏，
但我是无法找到Paperscript提供任何方式来获取我的项目组的当前轮换
。

I'm making a small shoot 'em up game with Paper.js, but I'm unable to find that Paperscript provides any way to get the current rotation of my group of items.

在下面的代码中，用Q和'旋转'circlegroup' E键应该影响WASD导航，沿着对象的鼻子当前指向的方向移动项目。我想我需要得到我的物品的当前旋转，以便
影响导航。 Paper.js是否提供了这样做的方法？

In the code beneath, rotating 'circlegroup' with Q and E keys, should affect the WASD navigation, moving the item in the direction that the 'nose' of the object is currently pointing at. I figure that I need to get the current rotation of my items in order to affect the navigation. Does Paper.js provide any way to do this?

你可以看到/在这里编辑Papersketch

bigcircle = new Path.Circle({
  radius:10,
  fillColor: 'grey',
  position: (10, 20),
  selected: true
});

smallcircle = new Path.Circle({
  radius:5,
  fillColor: 'black'
});

var circlecontainer  = new Group({
  children:[smallcircle, bigcircle],
  position: view.center
});


var circlegroup = new Group({
  children: [circlecontainer]
});

function onKeyDown(event) {
  if(event.key == 'w') {
    circlegroup.position.y -= 10;
  }
  if(event.key == 'a') {
    circlegroup.position.x -= 10;
  }
  if(event.key == 's') {
    circlegroup.position.y += 10;
  }
  if(event.key == 'd') {
    circlegroup.position.x += 10;
  }
  if(event.key == 'q') {
      // hold down
    circlegroup.rotate(1);
  }
  if(event.key == 'e') {
      // hold downw
    circlegroup.rotate(-1);
  }
}

推荐答案

否，每个对象没有存储旋转属性。您需要自己为每个对象或类定义它。看一下 Github存储库中包含的Paperoids游戏一个更详细的例子。

No, there's no rotation property stored per object. You'll need to define it per object or class yourself. Take a look at the Paperoids game included in the Github Repository for a more detailed example.

这篇关于使用Paper.js检测当前旋转的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！