通过格式化双值来绘制对齐的字符串 [英] Drawing aligned strings by formatting double values

问题描述

我正在创建一个创建双数组表的用户控件.我能够绘制它们，但我不知道如何对齐这些值.

I am creating a user control which creates a table of a double array. I am able to draw them but I don't know how align the values.

示例:我的数据看起来像

Example: my data looks like

 double[] data = new double[]
            {
                -13.5,
                -8.5,
                -3.5,
                0,
                3.5,
                8.5,
                13.5
            };

所以我希望当我绘制这些值时，它们应该对齐(右对齐)，以便所有值的点都出现在同一位置.

so i want that when i draw these values they should be aligned (right aligned) so the dot appears exactly on same place for all values.

这是我使用的代码:

private void DrawTable()
        {
            _format.Alignment = StringAlignment.Far;
            _format.LineAlignment = StringAlignment.Far;
            int yPos = 2;
            RectangleF rect = RectangleF.Empty;
            foreach (var item in Data)
            {
                string str = item.ToString("F3");
                str = string.Format("{0}dB", str);
                str = string.Format("{0,10}",str);
                SizeF size = _gBmp.MeasureString(str, Font);
                rect.X = 5;
                rect.Y = yPos;
                rect.Width = size.Width;
                rect.Height = size.Height;
                _gBmp.DrawString(str, Font, _textBrush, rect, _format);
                yPos += 20;
            }
        }

推荐答案

问题是您正在通过测量字符串的大小创建的矩形中绘制每个项目.

The problem is that you are drawing each item in a rectangle which you create by measuring the size of the string.

您需要为您绘制的每个字符串使用相同宽度的矩形.然后，如果您将字符串右对齐，它们将对齐(前提是您使用相同的字体).

You instead need to use the same width rectangle for each string you draw. Then if you right-align the strings they will line up (provided you're using the same font).

不要使用 String.Format 填充来填充字符串.这不是使用 GDI+ 的正确方法，它主要用于固定宽度字体，如控制台显示.您唯一要使用字符串格式的方法是指定固定的小数位数.

Do not use the String.Format padding to pad the strings for you. It's not the right way to do it with GDI+ and it's mainly for fixed-width fonts like a console display. The only thing you want to use string formatting for is to specify a fixed number of decimal places.

如果我希望列的宽度通常动态调整大小，我要做的是测量列表中的每个元素，然后选择所有测量宽度的最大宽度.但是，通常您希望将其夹到最大宽度，以防万一您的字符串非常长.

If I want the width of the column to be dynamically sized normally what I do is measure every element in the list and then select the maximum width of all of the measured widths. Usually you want to clamp it to a max width in case you have a really long string, though.

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