Ideas for Snap to grid

原文链接： http://www.iforce2d.net/forums/viewtopic.php?f=8&t=142

"Snap to grid" is scoring quite high in the feature voting. I am starting to think about ways to implement it, but since the item types in a Box2D scene are quite different, there does not seem to be any one specific way to handle them all. I'm wondering if people who have something specific in mind could comment here about what would help them out. Mainly I'm looking for people who have actually come across this issue in real situations in the past, rather than a general brainstorm.

Firstly the grid dimensions would need to be defined, which would go in the scene settings dialog, with x,y sizes for grid cells, for each edit mode (body, fixture, vertex, image, joint).

For some edit modes it seems quite straightforward, eg. for bodies, joints and vertices, I guess the position of the body/anchor/vertex could snap to the grid. For fixtures and images though it's not so simple. There does not seem to be any obvious way to align these with a grid, especially fixtures which are not even restricted to being rectangular. Any comments about this would be appreciated.

"Snap to grid"可以翻译成非连续的变换或者网格对齐，它在功能投票中拥有很高的分数，然后我就开始思考着怎么去实现它，但是在box2d中不同类型组件之间是相当不同的，好像没有一个很好的办法去处理所有的组件，我希望大家可以在这里讨论一下，怎么样用最好的方法来实现它，我也期盼有人在以前的软件开发中也碰到过这样相同的问题并且解决了它，这样比来一次头脑风暴更好。

首先，格子的尺寸需要被在【scene settings】对话框中被定义，用x,y尺寸来定义一个单元格，并且适用于所有的编辑模式。

在一个编辑模式下它可以很直接，例如在刚体关节和顶点模式下可以非连续变换，但是在夹具跟图片模式下，它就不那么简单了，这里没有一个明显有效的方法来排列它们，特别是夹具，它是不必限制为一个矩形的。

My understanding of snap to grid is simply that whatever you're dragging gets snapped to a grid point. Whether it's fixture vertices, bodies or joints, I don't see what the difference is?

I use this feature in Box2d Body Editor for creating large static fixtures for levels, e.g. mazes. I use arbitrarily shaped polygons but often need various points from different fixtures to line up along the same x/y plane. Without snap to grid, the only way to align them is manually setting the location in the Property panel.

Can you not implement it globally as a modifier to the mouse x/y coordinates if snap to grid is on?

我理解的非连续性变换是相当简单的，各种组件之间没有太大的区别。

我在刚体编辑模式下用这个功能去创建一个大的静态夹具，例如迷宫，我用任意形态的多边形但是经常需求跟另外的夹具在x/y轴做对齐操作，如果没有非连续性变换这个操作，就只有用手工设置它的变换属性

你可以不要把它做为一个全局的调节器来执行么？

The difference is that a body is a single point, which is easy and intuitive to snap to a grid, while a fixture can have hundreds of points.
Take this for example:

它们的区别在于：刚体只是一个单个的点，很简单直观地进行非连续性变换，但是一个夹具刚有成千上万个顶点

就像下面的例子：

It's all very well to say "just snap it to the grid" but how exactly? The only way I can think of is to have every point of the fixture checking for the closest grid-line to itself, and then choose the closest among them. Seems like a reasonable solution, but I was wondering if there was a better way.

You say that you line fixtures up along the same x/y plane... does this involve rotating them? Are we still talking about a grid, or are they being snapped to the position of other fixtures?

Yes, it would be implemented as a modifier to the mouse coordinates.

“非连续性变换”说起来简单，但是到处要怎么做呢？我能想到的唯一办法是让所有的夹具顶点检测它最近的网格线，然后选择离它们最近的那线，好像是一个有效的解决办法，但是我期望有一个更好的办法

你说的用x/y轴来对齐夹具，但是这样貌似不适用于旋转，我们不再是讨论一个网格，而是讨论对齐到一个夹具顶点

是的，它是要被执行成一个鼠标坐标调节器

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