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Graphics.DrawImage Method (Image, Int32, Int32, Rectangle, GraphicsUnit)

Draws a portion of an image at a specified location.

Namespace: System.Drawing
Assembly: System.Drawing (in system.drawing.dll)

public void DrawImage (
	Image image,
	int x,
	int y,
	Rectangle srcRect,
	GraphicsUnit srcUnit
)
public void DrawImage (
	Image image, 
	int x, 
	int y, 
	Rectangle srcRect, 
	GraphicsUnit srcUnit
)
public function DrawImage (
	image : Image, 
	x : int, 
	y : int, 
	srcRect : Rectangle, 
	srcUnit : GraphicsUnit
)
Not applicable.

Parameters

image

Image to draw.

x

The x-coordinate of the upper-left corner of the drawn image.

y

The y-coordinate of the upper-left corner of the drawn image.

srcRect

Rectangle 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.

Exception typeCondition

ArgumentNullException

image is a null reference (Nothing in Visual Basic).

An Image 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.

The following code example is designed for use with Windows Forms, and it requires PaintEventArgse, 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.

The size of the source rectangle determines what portion of the unscaled original image is drawn to the screen.

public void DrawImage2IntRect(PaintEventArgs e)
{
             
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create coordinates for upper-left corner of image.
    int x = 100;
    int y = 100;
             
    // Create rectangle for source image.
    Rectangle srcRect = new Rectangle(50, 50, 150, 150);
    GraphicsUnit units = GraphicsUnit.Pixel;
             
    // Draw image to screen.
    e.Graphics.DrawImage(newImage, x, y, srcRect, units);
}

public void DrawImage2IntRect(PaintEventArgs e) 
{
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");

    // Create coordinates for upper-left corner of image.
    int x = 100;
    int y = 100;

    // Create rectangle for source image.
    Rectangle srcRect =  new Rectangle(50, 50, 150, 150);
    GraphicsUnit units = GraphicsUnit.Pixel;

    // Draw image to screen.
    e.get_Graphics().DrawImage(newImage, x, y, srcRect, units);
} //DrawImage2IntRect

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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