如何转换为缇像素.NET？ [英] How do I convert Twips to Pixels in .NET?

问题描述

我的工作，其中一个数据库中的实际存储缇显示尺寸迁移项目。
既然不能用缇分配大小，以WPF或WinForms控件，我想知道是否有.NET运行时可使用的转换方法？

I'm working on a migration project in which a database actually stores display sizes in twips. Since I can't use twips to assign sizes to WPF or Winforms controls, I was wondering if .NET has a conversion method usable at runtime?

推荐答案

原来，迁移工具拥有的东西，但它不会做任何好处在运行时。这是我做了（如果在扩展方法的硬codeD值改为每英寸点数，将工作作为一个点转换器值太）：

It turns out that the migration tool has something, but it wouldn't do any good at runtime. Here's what I did (if the hard-coded value in the extension method were changed to the value for points per inch it would work as a point converter too):

1缇= 1 /英寸的1440。
在.NET 图形对象有一个方法 DpiX 和 DpiY 它可以用来确定有多少像素处于一英寸。
使用这些测量我创建了图形下面的扩展方法：

1 Twip = 1/1440th of an inch. The .NET Graphics object has a method DpiX and DpiY which can be used to determine how many pixels are in an inch. Using those measurements I created the following extension methods for Graphics:

using System.Drawing;

static class Extensions
{
    /// <summary>
    /// Converts an integer value in twips to the corresponding integer value
    /// in pixels on the x-axis.
    /// </summary>
    /// <param name="source">The Graphics context to use</param>
    /// <param name="inTwips">The number of twips to be converted</param>
    /// <returns>The number of pixels in that many twips</returns>
    public static int ConvertTwipsToXPixels(this Graphics source, int twips)
    {
        return (int)(((double)twips) * (1.0 / 1440.0) * source.DpiX);
    }

    /// <summary>
    /// Converts an integer value in twips to the corresponding integer value
    /// in pixels on the y-axis.
    /// </summary>
    /// <param name="source">The Graphics context to use</param>
    /// <param name="inTwips">The number of twips to be converted</param>
    /// <returns>The number of pixels in that many twips</returns>
    public static int ConvertTwipsToYPixels(this Graphics source, int twips)
    {
        return (int)(((double)twips) * (1.0 / 1440.0) * source.DpiY);
    }
}

要使用这些方法之一，只是需要做以下（假设你在的createGraphics 返回 Drawing.Graphics 对象（这里这个是一个形式，让的createGraphics 是表格的超一流控制）

To use these methods one simply has to do the following (assuming you're in a context where CreateGraphics returns a Drawing.Graphics object (here this is a Form, so CreateGraphics is inherited from Form's super-class Control):

using( Graphics g = CreateGraphics() )
{
    Width = g.ConvertTwipsToXPixels(sizeInTwips);
    Height = g.ConvertTwipsToYPixels(sizeInTwips);
}

请参见 图形<备注部分/ code>的方式来获得图形对象的列表类文档。更完整的文档可在本教程的如何：创建图形对象

See the "Remarks" section in the Graphics Class documentation for a list of ways to obtain a graphics object. More complete documentation is available in the tutorial How to: Create Graphics Objects.

的最简单的方法小结：

• Control.CreateGraphics


• Paint事件的 PaintEventArgs的有一个图形在图形属性。


• 手动 Graphics.FromImage 图像，它会返回一个图形对象，可以是图片上画画。 （注：这是不可能的，你需要使用缇为实际图像）

• Control.CreateGraphics
• a Paint event's PaintEventArgs has a Graphics available in its Graphics property.
• Hand Graphics.FromImage an image and it will return a Graphics object that can draw on that image. (NOTE: It is unlikely that you'll want to use twips for an actual image)

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