DrawImage Method (Image, Point[], Rectangle, GraphicsUnit)
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Graphics::DrawImage Method (Image^, array<Point>^, Rectangle, 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,
	array<Point>^ destPoints,
	Rectangle srcRect,
	GraphicsUnit srcUnit
)

Parameters

image
Type: System.Drawing::Image^

Image to draw.

destPoints
Type: array<System.Drawing::Point>^

Array of three Point structures that define a parallelogram.

srcRect
Type: System.Drawing::Rectangle

Rectangle 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.

Exception Condition
ArgumentNullException

image is null.

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 image to the screen.

The position of the parallelogram 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 DrawImageParaRect( PaintEventArgs^ e )
   {

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

      // Create parallelogram for drawing image.
      Point ulCorner = Point(100,100);
      Point urCorner = Point(325,100);
      Point llCorner = Point(150,250);
      array<Point>^ destPara = {ulCorner,urCorner,llCorner};

      // Create rectangle for source image.
      Rectangle srcRect = Rectangle(50,50,150,150);
      GraphicsUnit units = GraphicsUnit::Pixel;

      // Draw image to screen.
      e->Graphics->DrawImage( newImage, destPara, srcRect, units );
   }

.NET Framework
Available since 1.1
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