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Graphics.DrawImage Method (Image, Single, Single, RectangleF, 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,
	float x,
	float y,
	RectangleF srcRect,
	GraphicsUnit srcUnit
)

Parameters

image
Type: System.Drawing.Image
Image to draw.
x
Type: System.Single
The x-coordinate of the upper-left corner of the drawn image.
y
Type: System.Single
The y-coordinate of the upper-left corner of the drawn image.
srcRect
Type: System.Drawing.RectangleF
RectangleF structure that specifies the portion of the Image to draw.
srcUnit
Type: System.Drawing.GraphicsUnit
Member of the GraphicsUnit enumeration that specifies the units of measure used by the srcRect parameter.
ExceptionCondition
ArgumentNullException

image is null.

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 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.

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


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);
}


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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