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

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)

'Declaration
Public Sub DrawImage ( _
	image As Image, _
	destPoints As PointF(), _
	srcRect As RectangleF, _
	srcUnit As GraphicsUnit, _
	imageAttr As ImageAttributes _
)
'Usage
Dim instance As Graphics
Dim image As Image
Dim destPoints As PointF()
Dim srcRect As RectangleF
Dim srcUnit As GraphicsUnit
Dim imageAttr As ImageAttributes

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

Parameters

image

Image to draw.

destPoints

Array of three PointF structures that define a parallelogram.

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.

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 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 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 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 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 destination parallelogram, the position 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 Sub DrawImageParaFRectFAttrib(ByVal e As PaintEventArgs)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create parallelogram for drawing original image.
    Dim ulCorner1 As New PointF(100.0F, 100.0F)
    Dim urCorner1 As New PointF(325.0F, 100.0F)
    Dim llCorner1 As New PointF(150.0F, 250.0F)
    Dim destPara1 As PointF() = {ulCorner1, urCorner1, llCorner1}

    ' Create rectangle for source image.
    Dim srcRect As New RectangleF(50.0F, 50.0F, 150.0F, 150.0F)
    Dim units As GraphicsUnit = GraphicsUnit.Pixel

    ' Create parallelogram for drawing adjusted image.
    Dim ulCorner2 As New PointF(325.0F, 100.0F)
    Dim urCorner2 As New PointF(550.0F, 100.0F)
    Dim llCorner2 As New PointF(375.0F, 250.0F)
    Dim destPara2 As PointF() = {ulCorner2, urCorner2, llCorner2}

    ' Draw original image to screen.
    e.Graphics.DrawImage(newImage, destPara1, srcRect, units)

    ' Create image attributes and set large gamma.
    Dim imageAttr As New ImageAttributes
    imageAttr.SetGamma(4.0F)

    ' Draw adjusted image to screen.
    e.Graphics.DrawImage(newImage, destPara2, srcRect, units, _
    imageAttr)
End Sub

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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