CODEWITHSUNDEEP
c#gdi+
eagle999
eagle999

Reputation: 251

How to rotate Text in GDI+?

I want to display an given string in a specific angle. I tried to to do this with the System.Drawing.Font class. Here is my code:

Font boldFont = new Font(FontFamily.GenericSansSerif, 12, FontStyle.Bold, GraphicsUnit.Pixel, 1, true);
graphics.DrawString("test", boldFont, textBrush, 0, 0);

Can anyone help me?

Upvotes: 14

Views: 21561

Answers (3)

nivs1978
nivs1978

Reputation: 1290

If you want a method to draw a rotated string at the strings center position, then try the following method:

public void drawRotatedText(Bitmap bmp, int x, int y, float angle, string text, Font font, Brush brush)
{
  Graphics g = Graphics.FromImage(bmp);
  g.TranslateTransform(x, y); // Set rotation point
  g.RotateTransform(angle); // Rotate text
  g.TranslateTransform(-x, -y); // Reset translate transform
  SizeF size = g.MeasureString(text, font); // Get size of rotated text (bounding box)
  g.DrawString(text, font, brush, new PointF(x - size.Width / 2.0f, y - size.Height / 2.0f)); // Draw string centered in x, y
  g.ResetTransform(); // Only needed if you reuse the Graphics object for multiple calls to DrawString
  g.Dispose();
}

Best regards Hans Milling...

Upvotes: 9

Darin Dimitrov
Darin Dimitrov

Reputation: 1038730

String theString = "45 Degree Rotated Text";
SizeF sz = e.Graphics.VisibleClipBounds.Size;
//Offset the coordinate system so that point (0, 0) is at the
center of the desired area.
e.Graphics.TranslateTransform(sz.Width / 2, sz.Height / 2);
//Rotate the Graphics object.
e.Graphics.RotateTransform(45);
sz = e.Graphics.MeasureString(theString, this.Font);
//Offset the Drawstring method so that the center of the string matches the center.
e.Graphics.DrawString(theString, this.Font, Brushes.Black, -(sz.Width/2), -(sz.Height/2));
//Reset the graphics object Transformations.
e.Graphics.ResetTransform();

Taken from here.

Upvotes: 21

Tomas Petricek
Tomas Petricek

Reputation: 243041

You can use the RotateTransform method (see MSDN) to specify rotation for all drawing on Graphics (including text drawn using DrawString). The angle is in degrees:

graphics.RotateTransform(angle)

If you want to do just a single rotated operation, then you can reset the transform to the original state by calling RotateTransform again with negative angle (alternatively, you can use ResetTransform, but that will clear all transformations that you applied which may not be what you want):

graphics.RotateTransform(-angle)

Upvotes: 10

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