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Graphics.DrawImage Method (Image, Point[], Rectangle, GraphicsUnit, ImageAttributes)

Draws the specified portion of the specified Image at the specified location.

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

public void DrawImage (
	Image image,
	Point[] destPoints,
	Rectangle srcRect,
	GraphicsUnit srcUnit,
	ImageAttributes imageAttr
)
public void DrawImage (
	Image image, 
	Point[] destPoints, 
	Rectangle srcRect, 
	GraphicsUnit srcUnit, 
	ImageAttributes imageAttr
)
public function DrawImage (
	image : Image, 
	destPoints : Point[], 
	srcRect : Rectangle, 
	srcUnit : GraphicsUnit, 
	imageAttr : ImageAttributes
)
Not applicable.

Parameters

image

Image to draw.

destPoints

Array of three Point structures that define a parallelogram.

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.

imageAttr

ImageAttributes that specifies recoloring and gamma information for the image object.

Exception typeCondition

ArgumentNullException

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

The destPoints parameter specifies three points of a parallelogram. The three Point 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 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 points that define a parallelogram in which to draw the image.

  • Creates a rectangle to select the portion of the image to draw.

  • Sets the graphics drawing unit to pixel.

  • Draws the original image to the screen.

  • Creates an additional parallelogram in which to draw an adjusted image.

  • Creates and sets the attributes of the adjusted image to have a larger-than-usual gamma value.

  • Draws the adjusted image to the screen.

For the original, unadjusted parallelogram, the position locates the image on the screen, and the size of the rectangle and the size and shape of the parallelogram determines the scaling and shearing of the drawn image.

private void DrawImageParaRectAttrib(PaintEventArgs e)
{
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create parallelogram for drawing image.
    Point ulCorner1 = new Point(100, 100);
    Point urCorner1 = new Point(325, 100);
    Point llCorner1 = new Point(150, 250);
    Point[] destPara1 = {ulCorner1, urCorner1, llCorner1};
             
    // Create rectangle for source image.
    Rectangle srcRect = new Rectangle(50, 50, 150, 150);
    GraphicsUnit units = GraphicsUnit.Pixel;
             
    // Draw original image to screen.
    e.Graphics.DrawImage(newImage, destPara1, srcRect, units);
             
    // Create parallelogram for drawing adjusted image.
    Point ulCorner2 = new Point(325, 100);
    Point urCorner2 = new Point(550, 100);
    Point llCorner2 = new Point(375, 250);
    Point[] destPara2 = {ulCorner2, urCorner2, llCorner2};
             
    // Create image attributes and set large gamma.
    ImageAttributes imageAttr = new ImageAttributes();
    imageAttr.SetGamma(4.0F);
             
    // Draw adjusted image to screen.
    e.Graphics.DrawImage(newImage, destPara2, srcRect, units, imageAttr);
}

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
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