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Graphics.DrawImage Method (Image, PointF[], RectangleF, GraphicsUnit)

Draws the specified portion of the specified Image at the specified location and with the specified size.

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

public void DrawImage(
	Image image,
	PointF[] destPoints,
	RectangleF srcRect,
	GraphicsUnit srcUnit
)

Parameters

image
Type: System.Drawing.Image

Image to draw.

destPoints
Type: System.Drawing.PointF[]

Array of three PointF structures that define a parallelogram.

srcRect
Type: System.Drawing.RectangleF

RectangleF structure that specifies the portion of the image object 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.

The destPoints parameter specifies three points of a parallelogram. The three PointF structures represent the upper-left, upper-right, and lower-left corners of the parallelogram. The fourth point is extrapolated from the first three to form a parallelogram.

The srcRect parameter specifies a rectangular portion of the image object to draw. This portion is scaled and sheared to fit inside the parallelogram specified by the destPoints parameter.

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 points that define a destination parallelogram in which to draw 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 position of the destination parallelogram locates the image on the screen, the size of the source rectangle and the size and shape of the destination parallelogram determines the scaling and shearing of the drawn image, and the size of the rectangle determines what portion of the original image is drawn to the screen.

private void DrawImageParaFRectF(PaintEventArgs e)
{

    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");

    // Create parallelogram for drawing image.
    PointF ulCorner = new PointF(100.0F, 100.0F);
    PointF urCorner = new PointF(550.0F, 100.0F);
    PointF llCorner = new PointF(150.0F, 250.0F);
    PointF[] destPara = {ulCorner, urCorner, llCorner};

    // 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, destPara, srcRect, units);
}

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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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