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在Unity中创建2D箭头

[英]Creating a 2D arrow in Unity

原文 2019-03-27 15:48:04 4 2 c#/ unity3d/ game-engine

I am using unity 2d to create a golf game, currently I have a golf ball that you can click on, drag your mouse back and let go to fire the ball. 我正在使用unity 2d制作高尔夫游戏，目前我有一个高尔夫球，可以单击它，将鼠标向后拖动，然后放开球。 I would like to add an arrow that starts where you click and ends where you let go to see the direction of aim. 我想添加一个箭头，该箭头从您单击的位置开始，到您放开以查看目标方向的位置结束。

I cannot seem to find any documentation on how to do this or where to begin. 我似乎找不到任何有关如何执行此操作或从何开始的文档。 Any help on this or if you could push me in the right direction I would appreciate it. 在此方面的任何帮助，或者如果您可以将我推向正确的方向，我将不胜感激。

2 个解决方案

It sounds like you want to create a world-space UI canvas and draw an arrow on it. 听起来您想创建一个具有世界空间的UI画布并在其上绘制箭头。 There are many ways you can do the second half, but a good place to start would be to get a UI canvas in there and start toying with ways that you can make objects in that behave. 下半部有很多方法，但是一个好的开始是将UI画布放到那里，然后开始尝试使该对象行为的方式。

For more on world-space UI, refer here . 有关世界空间用户界面的更多信息，请参见此处。

You need to save the position where you click. 您需要保存点击位置。 You can get the mouse position with Input.mousePosition. 您可以使用Input.mousePosition获取鼠标位置。 More information about this here . 关于这方面更多的信息在这里。 While holding the click, you have to store a second mouse position, this one will save the current position. 按住单击时，您必须存储第二个鼠标位置，该位置将保存当前位置。 Use, for example, a LineRenderer linking both positions. 例如，使用链接两个位置的LineRenderer 。 If you want the arrow aiming to the opposite direction ie the position where the ball will be fired, just set the second position to negative. 如果您希望箭头指向相反的方向，即将球发射的位置，只需将第二个位置设置为负数即可。