从毫米计算逻辑像素 [英] Calculate logical pixels from millimeters

问题描述

我设计的宽度，高度，填充物...以毫米为单位.我现在正试图找出如何将这些数字转换为Flutter使用的逻辑像素系统.
我发现有关设备像素比率的文档，但我我不确定如何解释该数字，我引用:

I have a design with widths, heights, paddings... in millimeters. I'm now trying to figure out how to convert those numbers to the logical pixel system Flutter uses.
I found the docs for the device pixel ratio but I'm not sure how to interpret that number and I quote:

Flutter框架在逻辑像素中运行，因此几乎没有必要直接处理此属性.

The Flutter framework operates in logical pixels, so it is rarely necessary to directly deal with this property.

所以我不确定这是否可行.
我的问题归结为:有没有一种简便的方法可以计算从毫米到逻辑像素，并且适用于Android和iOS?

So I am not sure if this is the way to go.
My question comes down to this: Is there an easy way to calculate from millimeter to logical pixels that works for both Android and iOS?

推荐答案

Flutter的单位是DP或DIP(又称密度无关像素).就像它的名字所暗示的那样，它与屏幕像素比率无关.

Flutter's unit is DP or dip (aka density independent pixels). Like it's name is implying, it's independent from the screen pixel ratio.

毫米有什么区别?没有什么真正重要的.转换mm> dp或dp> mm类似于mm> inch/inch> mm.

What's the difference with millimeters ? None really important. Converting mm>dp or dp>mm is similar to mm>inch/inch>mm.

它们之间的关系非常简单:

The relationship between them is fairly simple :

1英寸= 25.4毫米= 160.0 DP

1 inch = 25.4 mm = 160.0 DP

这意味着1毫米= 6.299 DP

Which means 1 mm = 6.299 DP

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