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.

Can you show us the entire method (for example, is this the OnPaint event)? Also, can you tell us what results you are getting? — mbeckish, Nov 01 '11 at 14:28

score 27 · Accepted Answer · edited May 23 '17 at 12:25

27

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+?

edited May 23 '17 at 12:25

Community

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answered Nov 01 '11 at 15:22

LarsTech

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@LarsTech.Works like a Charm.Can you help me do this in the case of an image.I have added the Code Please see. – techno Nov 02 '11 at 01:51

score 3 · Answer 2 · answered Nov 01 '11 at 14:19

3

before g.DrawString(mytext, font, brush, 0, 0); use g.RotateTransform(45);

answered Nov 01 '11 at 14:19

Mazen313

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Drawing a Rotated Text to an Image in C#

2 Answers2

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