Add text to an image using C#

Image

Adding text to images

To add simple, one-line text to an image file, use the DrawText method. It requires the parameters outlined below.

  • ImageID — The GdPicture image ID of the loaded image.
  • Text — The body of the text.
  • DstLeft — The horizontal distance between the coordinate origin and the upper-left corner of the text (in pixels).
  • DstTop — The vertical distance between the coordinate origin and the upper-left corner of the text (in pixels).
  • FontSize — The font size in units specified by the FontSetUnit method. The possible values are the following:
    • UnitPoint
    • UnitInch
    • UnitPixel
    • UnitDocument (1/300 inch)
  • FontStyle — The font size set by the FontStyle enumeration. The possible values are the following:
    • Regular
    • Bold
    • Italic
    • Underline
    • Strikeout
  • TextColor — The text color specified by the ARGB method or the Color object.
  • FontName —The name of the font used.
  • AntiAlias — Applies the antialiasing algorithm if set to true.

To add text to an image, use the following code:

using GdPictureImaging gdpictureImaging = new GdPictureImaging();
int imageID = gdpictureImaging.CreateGdPictureImageFromFile(@"C:\temp\source.jpg");
// Set the font size unit to points.
gdpictureImaging.FontSetUnit(UnitMode.UnitPoint);
// Add the text to the image.
gdpictureImaging.DrawText(imageID, "GdPicture.NET", 5, 5, 40, FontStyle.Regular,
    gdpictureImaging.ARGB(100, 128, 128, 128), "Arial", true);
gdpictureImaging.SaveAsJPEG(imageID, @"C:\temp\output.jpg");
gdpictureImaging.ReleaseGdPictureImage(imageID);

Used methods

Adding gradient text to images

To add text with a linear gradient to an image, use the DrawTextGradient method. This method uses the same parameters as the DrawText method, but the TextColor parameter is replaced by the StartColor and EndColor parameters. These parameters accept either the ARGB method or the Color object.

To add gradient text to an image, use the following code:

using GdPictureImaging gdpictureImaging = new GdPictureImaging();
int imageID = gdpictureImaging.CreateGdPictureImageFromFile(@"C:\temp\source.jpg");
// Set the font size unit to points.
gdpictureImaging.FontSetUnit(UnitMode.UnitPoint);
// Add the text with a black-to-white gradient to the image.
gdpictureImaging.DrawTextGradient(imageID, "GdPicture.NET", 100, 50,
    gdpictureImaging.ARGB(255, 0, 0, 0), gdpictureImaging.ARGB(255, 255, 255, 255),
    40, FontStyle.Regular, "Arial", true);
gdpictureImaging.SaveAsJPEG(imageID, @"C:\temp\output.jpg");
gdpictureImaging.ReleaseGdPictureImage(imageID);

Used methods

Adding textured text

To add textured text to an image, use one of the following methods:

These methods use the same parameters as the DrawText method, but the TextColor parameter is replaced by the following:

  • TextureFilePath in the DrawTextTextureFromFile. This parameter specifies the path to the file that’s used as the texture of the text.
  • ImageTexture in the DrawTextTextureFromGdPictureImage. This parameter specifies the image ID of the file loaded in your project.

To add textured text to an image, use the following code:

using GdPictureImaging gdpictureImaging = new GdPictureImaging();
int imageID = gdpictureImaging.CreateGdPictureImageFromFile(@"C:\temp\source.jpg");
// Set the font size unit to points.
gdpictureImaging.FontSetUnit(UnitMode.UnitPoint);
// Add the text with a black-to-white gradient to the image.
gdpictureImaging.DrawTextTextureFromFile(imageID, @"C:\temp\texture.jpg",
    100, 50, 40, FontStyle.Regular, "Arial", true);
gdpictureImaging.SaveAsJPEG(imageID, @"C:\temp\output.jpg");
gdpictureImaging.ReleaseGdPictureImage(imageID);

Used methods

Related topics

Adding rotated text to images

To add text rotated at an angle to an image, use the DrawRotatedText method. It requires the parameters outlined below.

  • ImageID — The GdPicture image ID of the loaded image.
  • Angle — The clockwise angle at which the text is rotated (in degrees).
  • Text — The body of the text.
  • DstLeft — The horizontal distance between the coordinate origin and the upper-left corner of the text (in pixels).
  • DstTop — The vertical distance between the coordinate origin and the upper-left corner of the text (in pixels).
  • FontSize — The font size in units specified by the FontSetUnit method. The possible values are the following:
    • UnitPoint
    • UnitInch
    • UnitPixel
    • UnitDocument (1/300 inch)
  • FontStyle — The font size set by the FontStyle enumeration. The possible values are the following:
    • Regular
    • Bold
    • Italic
    • Underline
    • Strikeout
  • TextColor — The text color specified by the ARGB method or the Color object.
  • FontName — The name of the font used.
  • AntiAlias — Applies the antialiasing algorithm if set to true.

To add text to an image rotated at a 90-degree angle, use the following code:

using GdPictureImaging gdpictureImaging = new GdPictureImaging();
int imageID = gdpictureImaging.CreateGdPictureImageFromFile(@"C:\temp\source.jpg");
// Set the font size unit to points.
gdpictureImaging.FontSetUnit(UnitMode.UnitPoint);
// Add the text to the image rotated at 90 degrees clockwise.
gdpictureImaging.DrawRotatedText(imageID, 90, "GdPicture.NET", 100, 50, 40,
    FontStyle.Regular, gdpictureImaging.ARGB(100, 128, 128, 128), "Arial", true);
gdpictureImaging.SaveAsJPEG(imageID, @"C:\temp\output.jpg");
gdpictureImaging.ReleaseGdPictureImage(imageID);

Used methods

Related topics

Adding text with a background to images

To add text with a background to an image, use the following methods:

Both of these methods accept the same parameters as the DrawText and DrawRotatedText methods, respectively. They also accept the BackColor parameter, which specifies the color of the background. This parameter is declared after the TextColor parameter.

To add white text with a black background (semitransparent) rotated at a 90-degree angle, use the following method:

using GdPictureImaging gdpictureImaging = new GdPictureImaging();
int imageID = gdpictureImaging.CreateGdPictureImageFromFile(@"C:\temp\source.jpg");
// Set the font size unit to points.
gdpictureImaging.FontSetUnit(UnitMode.UnitPoint);
// Declare a `Color` object for the text font.
Color textColor = Color.White;
// Add the text to the image rotated at 90 degrees clockwise with a semitransparent black background.
gdpictureImaging.DrawRotatedTextBackColor(imageID, 90, "GdPicture.NET", 100, 50, 40,
    FontStyle.Regular, textColor, gdpictureImaging.ARGB(100, 0, 0, 0), "Arial", true);
gdpictureImaging.SaveAsJPEG(imageID, @"C:\temp\output.jpg");
gdpictureImaging.ReleaseGdPictureImage(imageID);

Used methods

Related topics

Adding text boxes to images

To add a text box to an image, use the DrawTextBox method. It requires the parameters outlined below.

  • ImageID — The GdPicture image ID of the loaded image.
  • Text— The body of the text box.
  • Left — The horizontal distance between the coordinate origin and the upper-left corner of the text box (in pixels).
  • Top — The vertical distance between the coordinate origin and the upper-left corner of the text box (in pixels).
  • Width — The width of the text box (in pixels).
  • Height — The height of the text box (in pixels).
  • FontSize — The font size in units specified by the FontSetUnit method. The possible values are the following:
    • UnitPoint
    • UnitInch
    • UnitPixel
    • UnitDocument (1/300 inch)
  • Alignment — The horizontal text alignment specified by the TextAlignment enumeration. The possible values are the following:
    • TextAlignmentCenter aligns text to the center.
    • TextAlignmentNear aligns text to the left side in left-to-right writing systems. In right-to-left systems, it’s aligned to the right.
    • TextAlignmentFar aligns text to the right side in left-to-right writing systems. In right-to-left systems, it’s aligned to the left.
  • FontStyle — The font size set by the FontStyle enumeration. The possible values are the following:
    • Regular
    • Bold
    • Italic
    • Underline
    • Strikeout
  • TextColor — The text color specified by the ARGB method or the Color object.
  • FontName — The name of the font used.
  • DrawBox — The Boolean value for drawing the borders of the text box.
  • AntiAlias — The Boolean value for applying the antialiasing algorithm.

To add a text box to an image, use the following code:

using GdPictureImaging gdpictureImaging = new GdPictureImaging();
int imageID = gdpictureImaging.CreateGdPictureImageFromFile(@"C:\temp\source.jpg");
// Set the font size unit to points.
gdpictureImaging.FontSetUnit(UnitMode.UnitPoint);
// Add the text to the image rotated at 90 degrees clockwise.
gdpictureImaging.DrawTextBox(imageID, "GdPicture.NET", 100, 50, 300, 200, 40,
    TextAlignment.TextAlignmentCenter, FontStyle.Regular,
    gdImage.ARGB(100, 128, 128, 128), "Arial", true, true);
gdpictureImaging.SaveAsJPEG(imageID, @"C:\temp\output.jpg");
gdpictureImaging.ReleaseGdPictureImage(imageID);

Used methods

Related topics