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

.NET Framework 1.1

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

[Visual Basic]
Overloads Public Sub DrawImage( _
   ByVal image As Image, _
   ByVal destPoints() As PointF, _
   ByVal srcRect As RectangleF, _
   ByVal srcUnit As GraphicsUnit, _
   ByVal imageAttr As ImageAttributes _
)
[C#]
public void DrawImage(
 Image image,
 PointF[] destPoints,
 RectangleF srcRect,
 GraphicsUnit srcUnit,
 ImageAttributes imageAttr
);
[C++]
public: void DrawImage(
 Image* image,
 PointF destPoints[],
 RectangleF srcRect,
 GraphicsUnit srcUnit,
 ImageAttributes* imageAttr
);
[JScript]
public function DrawImage(
   image : Image,
 destPoints : PointF[],
 srcRect : RectangleF,
 srcUnit : GraphicsUnit,
 imageAttr : ImageAttributes
);

Parameters

image
Image object to draw.
destPoints
Array of three Point 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 object that specifies recoloring and gamma information for the image object.

Return Value

This method does not return a value.

Remarks

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.

Example

[Visual Basic, C#] The following 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 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.

[Visual Basic, C#] 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.

[Visual Basic] 
Public Sub DrawImageParaFRectFAttrib(e As PaintEventArgs)
' Create image.
Dim newImage As Image = Image.FromFile("SampImag.jpg")
' Create parallelogram for drawing original image.
Dim ulCorner1 As New PointF(100F, 100F)
Dim urCorner1 As New PointF(325F, 100F)
Dim llCorner1 As New PointF(150F, 250F)
Dim destPara1 As PointF() =  {ulCorner1, urCorner1, llCorner1}
' Create rectangle for source image.
Dim srcRect As New RectangleF(50F, 50F, 150F, 150F)
Dim units As GraphicsUnit = GraphicsUnit.Pixel
' Create parallelogram for drawing adjusted image.
Dim ulCorner2 As New PointF(325F, 100F)
Dim urCorner2 As New PointF(550F, 100F)
Dim llCorner2 As New PointF(375F, 250F)
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(4F)
' Draw adjusted image to screen.
e.Graphics.DrawImage(newImage, destPara2, srcRect, units, _
imageAttr)
End Sub
        
[C#] 
public void DrawImageParaFRectFAttrib(PaintEventArgs e)
{
// Create image.
Image newImage = Image.FromFile("SampImag.jpg");
// Create parallelogram for drawing original image.
PointF ulCorner1 = new PointF(100.0F, 100.0F);
PointF urCorner1 = new PointF(325.0F, 100.0F);
PointF llCorner1 = new PointF(150.0F, 250.0F);
PointF[] destPara1 = {ulCorner1, urCorner1, llCorner1};
// Create rectangle for source image.
RectangleF srcRect = new RectangleF( 50.0F, 50.0F, 150.0F, 150.0F);
GraphicsUnit units = GraphicsUnit.Pixel;
// Create parallelogram for drawing adjusted image.
PointF ulCorner2 = new PointF(325.0F, 100.0F);
PointF urCorner2 = new PointF(550.0F, 100.0F);
PointF llCorner2 = new PointF(375.0F, 250.0F);
PointF[] destPara2 = {ulCorner2, urCorner2, llCorner2};
// Draw original image to screen.
e.Graphics.DrawImage(newImage, destPara1, srcRect, units);
// 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);
}
        

[C++, JScript] No example is available for C++ or JScript. To view a Visual Basic or C# example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also

Graphics Class | Graphics Members | System.Drawing Namespace | Graphics.DrawImage Overload List

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