绘制旋转文字到图像在C＃ [英] Drawing a Rotated Text to an Image in C#

问题描述

我使用的是图形类的束带方法绘制的图像的字符串。

I'm using the the drawstring method of Graphics class to draw a String on Image.

  g.DrawString(mytext, font, brush, 0, 0);

我试图用旋转的旋转变换图形对象的功能，使文本可以在任何angle.How我能做到这一点使用旋转变换绘制由角文本。 该旋转变换code我用的是

I'm trying to rotate the text by angle using the Rotate Transform Function of the graphic object so that the text can be drawn at any angle.How can i do it using Rotate Transform. The rotate Transform Code i used is

    Bitmap m = new Bitmap(pictureBox1.Image);
    Graphics x=Graphics.FromImage(m);
    x.RotateTransform(30);
    SolidBrush brush = new SolidBrush(Color.Red);
    x.DrawString("hi", font,brush,image.Width/2,image.Height/2);
//image=picturebox1.image
    pictureBox1.Image = m;

文字是画在一个旋转的角度，但它不是画在中间，我want.Plz帮助我。

The Text is Drawn at a rotated angle but it is not drawn at the centre as i want.Plz help me out.

推荐答案

这是不够的，只是 RotateTransform 或 TranslateTranform 如果要居中的文本。您需要抵消文本的起点，也通过测量：

It's not enough to just RotateTransform or TranslateTranform if you want to center the text. You need to offset the starting point of the text, too, by measuring it:

Bitmap bmp = new Bitmap(pictureBox1.Image);
using (Graphics g = Graphics.FromImage(bmp)) {
  g.TranslateTransform(bmp.Width / 2, bmp.Height / 2);
  g.RotateTransform(30);
  SizeF textSize = g.MeasureString("hi", font);
  g.DrawString("hi", font, Brushes.Red, -(textSize.Width / 2), -(textSize.Height / 2));
}

从如何GDI旋转文本+？

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