用标准化的科学记数法绘制字符串(上标) [英] Draw string with normalized scientific notation (superscripted )

问题描述

我想在我的游戏中绘制以下字符串

I want to draw following string in my game

相比之下，宇宙中有 10^75 个粒子.

To compare, there are 10^75 particles in the universe.

其中 10⁷⁵ 以标准化的科学记数法进行格式化(就像我们在学校时所做的那样).

where 10⁷⁵ is formatted in a normalized scientific notation (as we've been doing in school).

我使用 SpriteBatch.DrawString 方法，但我无法找到一个完整的解决方案.有一些琐碎的:

I use SpriteBatch.DrawString method, but I cannot figure out a nite solution. There are a few trivial ones:

• 绘制两个字符串，其中第二个字符串的字体较小或被缩放.
• 绘制图像.

我一直在研究 UTF 表，但似乎不可能.

I've been looking at UTF tables, but seems it's not possible.

我是否必须为此任务使用特殊字体?

Do I have to have special font for this task?

推荐答案

我不熟悉 XNA，但在 Silverlight 项目中，我不得不做同样的事情，我最终从上标字符构造了科学记数法数字.

I'm not familiar with XNA but in a Silverlight project where I had to do the same thing I ended up constructing scientific notation numbers from superscript characters.

>

您不需要特殊字体，只需要具有下面使用的上标字符的 Unicode 字体即可.

You don't need a special font, just a Unicode font which has the superscript characters used below.

这是将数字 0-9 映射到适当字符的代码:

Heres the code to map digits 0-9 to the appropriate character:

    private static string GetSuperscript(int digit)
    {
        switch (digit)
        {
            case 0:
                return "\x2070";

            case 1:
                return "\x00B9";

            case 2:
                return "\x00B2";

            case 3:
                return "\x00B3";

            case 4:
                return "\x2074";

            case 5:
                return "\x2075";

            case 6:
                return "\x2076";

            case 7:
                return "\x2077";

            case 8:
                return "\x2078";

            case 9:
                return "\x2079";

            default:
                return string.Empty;
        }
    }

这会将您的原始双精度数转换为科学记数法

And this converts your original double into scientific notation

    public static string FormatAsPowerOfTen(double? value, int decimals)
    {
        if(!value.HasValue)
        {
            return string.Empty;
        }

        var exp = (int)Math.Log10(value.Value);

        var fmt = string.Format("{{0:F{0}}}x10{{1}}", decimals);

        return string.Format(fmt, value / Math.Pow(10, exp), FormatExponentWithSuperscript(exp));
    }

    private static string FormatExponentWithSuperscript(int exp)
    {
        var sb = new StringBuilder();

        bool isNegative = false;

        if(exp < 0)
        {
            isNegative = true;
            exp = -exp;
        }

        while (exp != 0)
        {
            sb.Insert(0, GetSuperscript(exp%10));

            exp = exp/10;
        }

        if(isNegative)
        {
            sb.Insert(0, "-");
        }

        return sb.ToString();
    }

所以现在你应该可以使用 FormatAsPowerOfTen(123400, 2) 得到 1.23x10⁵.

So now you should be able to use FormatAsPowerOfTen(123400, 2) resulting in 1.23x10⁵.

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