计算给定窗口中适合的文本行数，Directwrite&的Direct2D [英] Calculating how many lines of text will fit in a given window, Directwrite & Direct2d

问题描述

我正在使用Directwrite设计一个文本控件，我想弄清楚窗口中有多少行文字。

< p style ="line-height：normal; background：white"> 现在我正在使用的公式如下：

 

lines_in_window = windowheight / txtformat-> GetFontSize（）;

 

/ *

windowheight是rc.bottom - rc.top，其值为

rc由GetClientRect填充（）

 

txtformat是一个IDWriteTextFormat *创建的字体大小为

"16.0f"

* /

解决方案

为了将来可能偶然遇到此问题的人的利益：使用IDWriteTextFormat时:: GetFontSize（），字体大小以点大小给出，在用于屏幕大小计算之前必须转换为像素。

I'm designing a text control using Directwrite, and I want to figure out how many lines of text will fit in a window.

Right now the formula I'm using looks like:

 

lines_in_window = windowheight/txtformat->GetFontSize();

 

/*

windowheight is rc.bottom - rc.top, with the values of

rc filled in by GetClientRect()

 

txtformat is an IDWriteTextFormat* created with a font size

of "16.0f"

*/

解决方案

For the benefit of those who may stumble across this problem in the future: when using IDWriteTextFormat::GetFontSize(), the font size is given as a point size and must be converted into pixels before being used in screen size calculations.

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