Drawing a Rotated Text to an Image in C#

Question

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

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

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;

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

Answer 1

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));
}

From How to rotate Text in GDI+?