如何从索引获取行和列? [英] How to get row and column from index?

问题描述

我在这里画一个巨大空白.

我发现的所有内容都是关于从给定的行和列中获取索引，但是如何从索引中获取行和列?

Everything I've found is about getting an index from a given row and column, but how do I get a row and a column from an index?

该行很容易:(int)(index / width).

我的大脑正试图计算色谱柱而流血.

My brain is suffering massive bleed trying to compute the column.

对我感到羞耻.

推荐答案

对于从零开始的索引，两个操作是:

For a zero-based index, the two operations are:

row    = (int)(index / width)
column = index % width

由于我是C语言人，所以我在这里使用%，尽管您尚未指定语言，但它肯定看起来像是基于C语言的语言之一.

I'm using % here since I'm a C guy and, though you haven't specified your language, it certainly looks like one of the C-based ones.

如果您的问题不是 与C或其兄弟有关，则对于您的特定环境而言，取模运算符将是什么，当您将index除以width时剩下的余数.

If your question does not pertain to C or its brethren, it will be whatever the modulo operator is for your particular environment, the remainder left over when you divide index by width.

如果您没有拥有模运算符，则可以使用:

If you don't have a modulo operator, you can use:

row    = (int)(index / width)
column = index - (row * width)

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