Graphics.DrawImage Method (Image, Single, Single, RectangleF, GraphicsUnit)
Draws a portion of an image at a specified location.
Assembly: System.Drawing (in System.Drawing.dll)
'Declaration Public Sub DrawImage ( _ image As Image, _ x As Single, _ y As Single, _ srcRect As RectangleF, _ srcUnit As GraphicsUnit _ )
- Type: System.Single
The x-coordinate of the upper-left corner of the drawn image.
- Type: System.Single
The y-coordinate of the upper-left corner of the drawn image.
- Type: System.Drawing.RectangleF
An Image stores a value for pixel width and a value for horizontal resolution (dots per inch). The physical width, measured in inches, of an image is the pixel width divided by the horizontal resolution. For example, an image with a pixel width of 360 and a horizontal resolution of 72 dots per inch has a physical width of 5 inches. Similar remarks apply to pixel height and physical height.
This method draws a portion of an image using its physical size, so the image portion will have its correct size in inches regardless of the resolution (dots per inch) of the display device. For example, suppose an image portion has a pixel width of 216 and a horizontal resolution of 72 dots per inch. If you call this method to draw that image portion on a device that has a resolution of 96 dots per inch, the pixel width of the rendered image portion will be (216/72)*96 = 288.
Creates an image from a JPEG file SampImag.jpg in the folder of the example.
Creates the coordinates at which to draw the upper-left corner of 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 size of the source rectangle determines what portion of the unscaled original image is drawn to the screen.
Public Sub DrawImage2FloatRectF(ByVal e As PaintEventArgs) ' Create image. Dim newImage As Image = Image.FromFile("SampImag.jpg") ' Create coordinates for upper-left corner of image. Dim x As Single = 100.0F Dim y As Single = 100.0F ' Create rectangle for source image. Dim srcRect As New RectangleF(50.0F, 50.0F, 150.0F, 150.0F) Dim units As GraphicsUnit = GraphicsUnit.Pixel ' Draw image to screen. e.Graphics.DrawImage(newImage, x, y, srcRect, units) End Sub