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Graphics.DrawImage Method (Image, Single, Single, RectangleF, GraphicsUnit)

.NET Framework 1.1

Draws a portion of an image at a specified location.

[Visual Basic]
Overloads Public Sub DrawImage( _
   ByVal image As Image, _
   ByVal x As Single, _
   ByVal y As Single, _
   ByVal srcRect As RectangleF, _
   ByVal srcUnit As GraphicsUnit _
)
[C#]
public void DrawImage(
 Image image,
 float x,
 float y,
 RectangleF srcRect,
 GraphicsUnit srcUnit
);
[C++]
public: void DrawImage(
 Image* image,
 float x,
 float y,
 RectangleF srcRect,
 GraphicsUnit srcUnit
);
[JScript]
public function DrawImage(
   image : Image,
 x : float,
 y : float,
 srcRect : RectangleF,
 srcUnit : GraphicsUnit
);

Parameters

image
Image object to draw.
x
x-coordinate of the upper-left corner of the drawn image.
y
y-coordinate of the upper-left corner of the drawn image.
srcRect
RectangleF structure that specifies the portion of the Image object to draw.
srcUnit
Member of the GraphicsUnit enumeration that specifies the units of measure used by the srcRect parameter.

Return Value

This method does not return a value.

Remarks

An Image object stores a value for pixel width and a value for horizontal resolution (dots per inch). The physical width, measured in inches, of an image is the pixel width divided by the horizontal resolution. For example, an image with a pixel width of 360 and a horizontal resolution of 72 dots per inch has a physical width of 5 inches. Similar remarks apply to pixel height and physical height.

This method draws a portion of an image using its physical size, so the image portion will have its correct size in inches regardless of the resolution (dots per inch) of the display device. For example, suppose an image portion has a pixel width of 216 and a horizontal resolution of 72 dots per inch. If you call this method to draw that image portion on a device that has a resolution of 96 dots per inch, the pixel width of the rendered image portion will be (216/72)*96 = 288.

Example

[Visual Basic, C#] The following example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code performs the following actions:

  • Creates an image from a JPEG file SampImag.jpg in the folder of the example.
  • Creates the coordinates at which to draw the upper-left corner of the image.
  • Creates a source rectangle from which to extract a portion of the image.
  • Sets the unit of measure of the source rectangle to pixels.
  • Draws the image to the screen.

[Visual Basic, C#] The size of the source rectangle determines what portion of the unscaled original image is drawn to the screen.

[Visual Basic] 
Public Sub DrawImage2FloatRectF(e As PaintEventArgs)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create coordinates for upper-left corner of image.
Dim x As Single = 100F
Dim y As Single = 100F
' Create rectangle for source image.
Dim srcRect As New RectangleF(50F, 50F, 150F, 150F)
Dim units As GraphicsUnit = GraphicsUnit.Pixel
' Draw image to screen.
e.Graphics.DrawImage(newImage, x, y, srcRect, units)
End Sub
        
[C#] 
public void DrawImage2FloatRectF(PaintEventArgs e)
{
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create coordinates for upper-left corner of image.
float x = 100.0F;
float y = 100.0F;
// Create rectangle for source image.
RectangleF srcRect = new RectangleF( 50.0F, 50.0F, 150.0F, 150.0F);
GraphicsUnit units = GraphicsUnit.Pixel;
// Draw image to screen.
e.Graphics.DrawImage(newImage, x, y, srcRect, units);
}
        

[C++, JScript] No example is available for C++ or JScript. To view a Visual Basic or C# example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also

Graphics Class | Graphics Members | System.Drawing Namespace | Graphics.DrawImage Overload List

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