问题描述

我正在使用 Graphics 类的 drawstring 方法在 Image 上绘制一个字符串.

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

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

我正在尝试使用图形对象的旋转变换功能按角度旋转文本，以便可以以任何角度绘制文本.我如何使用旋转变换来做到这一点.我使用的旋转变换代码是

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;

文本是以旋转的角度绘制的，但它没有按我的意愿绘制在中心.请帮帮我.

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

如果要使文本居中，仅 RotateTransform 或 TranslateTranform 是不够的.您还需要通过测量来偏移文本的起点:

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));
}

来自 如何在 GDI+ 中旋转文本?

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