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Metodo Graphics.DrawImageUnscaled (Image, Int32, Int32)

 

Data di pubblicazione: ottobre 2016

Disegna l'immagine specificata usando le dimensioni fisiche originali nella posizione indicata da una coppia di coordinate.

Spazio dei nomi:   System.Drawing
Assembly:  System.Drawing (in System.Drawing.dll)

public void DrawImageUnscaled(
	Image image,
	int x,
	int y
)

Parametri

image
Type: System.Drawing.Image

Oggetto Image da disegnare.

x
Type: System.Int32

Coordinata X dell'angolo superiore sinistro dell'immagine disegnata.

y
Type: System.Int32

Coordinata Y dell'angolo superiore sinistro dell'immagine disegnata.

Exception Condition
ArgumentNullException

image è null.

An T:System.Drawing.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 216 and a horizontal resolution of 72 dots per inch has a physical width of 3 inches. Similar remarks apply to pixel height and physical height.

The M:System.Drawing.Graphics.DrawImageUnscaled(System.Drawing.Image,System.Int32,System.Int32) method draws an image using its physical size, so the image will have its correct size in inches regardless of the resolution (dots per inch) of the display device. For example, suppose an image has a pixel width of 216 and a horizontal resolution of 72 dots per inch. If you call M:System.Drawing.Graphics.DrawImageUnscaled(System.Drawing.Image,System.Int32,System.Int32) to draw that image on a device that has a resolution of 96 dots per inch, the pixel width of the rendered image will be (216/72)*96 = 288.

The following code example is designed for use with Windows Forms, and it requires T:System.Windows.Forms.PaintEventArgse, which is a parameter of the E:System.Windows.Forms.Control.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 a point at which to draw the upper-left corner of the image.

  • Draws the entire image using its physical size.

public void DrawImageUnscaledInt(PaintEventArgs e)
{

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

    // Create coordinates for upper-left corner of image.
    int x = 100;
    int y = 100;

    // Draw image to screen.
    e.Graphics.DrawImageUnscaled(newImage, x, y);
}

.NET Framework
Disponibile da 1.1
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