Graphics.Drawstring 在 PictureBox 中看起来不错，但在 Bitmap 中却很糟糕
我正在尝试使用 DrawString 将文本写入图像，然后将其旋转 90 度。它无论是在位图上还是直接在 PictureBox 上都可以正常工作，但最大的区别在于质量。绘制的 PictureBox 文本质量很好，而且看起来很漂亮。当我把它画在图像上时，它看起来很可怕而且是块状的。我做了一些改变，试图让它看起来更好，但它看起来并不像应有的那么好。
示例代码：
使用一个 Windows 窗体项目并在其上放置 2 个图片框和一个按钮，然后使用以下代码运行它以了解我的意思：
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim g As System.Drawing.Graphics
g = PictureBox1.CreateGraphics
' x.DrawRectangle(New Pen(Brushes.White, 200), New Rectangle(0, 0, 200, 200))
g.TranslateTransform(10.0F, 0.0F)
g.RotateTransform(90)
g.DrawString("MM Components", New Font("Arial", 7, FontStyle.Regular), Brushes.DarkBlue, New PointF(0, 0))
Dim g2 As System.Drawing.Graphics
Dim img As New Bitmap(300, 300, Drawing.Imaging.PixelFormat.Format24bppRgb)
g2 = Graphics.FromImage(img)
g2.SmoothingMode = Drawing2D.SmoothingMode.AntiAlias
g2.TextRenderingHint = Drawing.Text.TextRenderingHint.AntiAliasGridFit
g2.CompositingQuality = Drawing2D.CompositingQuality.HighQuality
' img.SetResolution(150, 150)
' x.DrawRectangle(New Pen(Brushes.White, 200), New Rectangle(0, 0, 200, 200))
g2.TranslateTransform(10.0F, 0.0F)
g2.RotateTransform(90)
g2.FillRectangle(Brushes.White, 0, 0, 300, 300)
g2.DrawString("MM Components", New Font("Arial", 7, FontStyle.Regular), Brushes.DarkBlue, New PointF(0, 0))
PictureBox2.Image = img
'System.Threading.Thread.Sleep(20)
End Sub
End Class
I am trying to use DrawString to write text as an image and then rotate it 90 degrees. It works fine with both a bitmap or directly on a PictureBox, but the big difference is in the quality. The PictureBox text drawn has great quality and looks nice. When I draw it on an image it looks horrible and blocky. I've made a few changes to try and get it to look nicer, but it doesn't look nearly as nice as it should.
Sample code:
Use a Windows Forms project and place 2 picture boxes on it and a button and run it with the following code to see what I mean:
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim g As System.Drawing.Graphics
g = PictureBox1.CreateGraphics
' x.DrawRectangle(New Pen(Brushes.White, 200), New Rectangle(0, 0, 200, 200))
g.TranslateTransform(10.0F, 0.0F)
g.RotateTransform(90)
g.DrawString("MM Components", New Font("Arial", 7, FontStyle.Regular), Brushes.DarkBlue, New PointF(0, 0))
Dim g2 As System.Drawing.Graphics
Dim img As New Bitmap(300, 300, Drawing.Imaging.PixelFormat.Format24bppRgb)
g2 = Graphics.FromImage(img)
g2.SmoothingMode = Drawing2D.SmoothingMode.AntiAlias
g2.TextRenderingHint = Drawing.Text.TextRenderingHint.AntiAliasGridFit
g2.CompositingQuality = Drawing2D.CompositingQuality.HighQuality
' img.SetResolution(150, 150)
' x.DrawRectangle(New Pen(Brushes.White, 200), New Rectangle(0, 0, 200, 200))
g2.TranslateTransform(10.0F, 0.0F)
g2.RotateTransform(90)
g2.FillRectangle(Brushes.White, 0, 0, 300, 300)
g2.DrawString("MM Components", New Font("Arial", 7, FontStyle.Regular), Brushes.DarkBlue, New PointF(0, 0))
PictureBox2.Image = img
'System.Threading.Thread.Sleep(20)
End Sub
End Class
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评论（2）
正如您所指出的，这里的区别在于 ClearType。
阅读本文以获取有关它是什么及其工作原理的更多说明：
http://msdn.microsoft.com/en-us /library/dd183433(VS.85).aspx
另外还有 msdn 论坛上同一问题的另一份报告，其中包含修复程序：
http://social.msdn.microsoft.com/Forums/en-US/vbgeneral/thread/9a66c7a2-79ad- 4c9b-91cc-361ec72d13de
The difference here is, as you noted, ClearType.
Read this for more explanation on what it is and how it works:
http://msdn.microsoft.com/en-us/library/dd183433(VS.85).aspx
Also another report of the same issue on msdn forums, with included fix:
http://social.msdn.microsoft.com/Forums/en-US/vbgeneral/thread/9a66c7a2-79ad-4c9b-91cc-361ec72d13de
这些改变似乎让它看起来很不错......
These changes seem to make it look nice....