Image-Klasse
Eine abstrakte Basisklasse, die Funktionen für die von Bitmap und Metafile abgeleiteten Klassen bereitstellt.
Namespace: System.Drawing
Assembly: System.Drawing (in system.drawing.dll)
Syntax
'Declaration
<SerializableAttribute> _
<ComVisibleAttribute(True)> _
Public MustInherit Class Image
Inherits MarshalByRefObject
Implements ISerializable, ICloneable, IDisposable
'Usage
Dim instance As Image
[SerializableAttribute]
[ComVisibleAttribute(true)]
public abstract class Image : MarshalByRefObject, ISerializable, ICloneable, IDisposable
[SerializableAttribute]
[ComVisibleAttribute(true)]
public ref class Image abstract : public MarshalByRefObject, ISerializable, ICloneable, IDisposable
/** @attribute SerializableAttribute() */
/** @attribute ComVisibleAttribute(true) */
public abstract class Image extends MarshalByRefObject implements ISerializable, ICloneable,
IDisposable
SerializableAttribute
ComVisibleAttribute(true)
public abstract class Image extends MarshalByRefObject implements ISerializable, ICloneable,
IDisposable
Beispiel
Im folgenden Codebeispiel wird veranschaulicht, wie aus einer Datei eine neue Bitmap erstellt wird, wobei die GetPixel-Methode und die SetPixel-Methode zum Neueinfärben des Bilds verwendet werden. Außerdem werden die Eigenschaften PixelFormat, Width und Height verwendet.
Dieses Beispiel ist für die Verwendung mit einem Windows Form vorgesehen, das jeweils eine Instanz von Label, PictureBox und Button mit den Bezeichnungen Label1, PictureBox1 bzw. Button1 enthält. Fügen Sie den Code in das Formular ein, und ordnen Sie die Button1_Click-Methode dem Click-Ereignis der Schaltfläche zu.
Dim image1 As Bitmap
Private Sub Button1_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Button1.Click
Try
' Retrieve the image.
image1 = New Bitmap( _
"C:\Documents and Settings\All Users\Documents\My Music\music.bmp", _
True)
Dim x, y As Integer
' Loop through the images pixels to reset color.
For x = 0 To image1.Width - 1
For y = 0 To image1.Height - 1
Dim pixelColor As Color = image1.GetPixel(x, y)
Dim newColor As Color = _
Color.FromArgb(pixelColor.R, 0, 0)
image1.SetPixel(x, y, newColor)
Next
Next
' Set the PictureBox to display the image.
PictureBox1.Image = image1
' Display the pixel format in Label1.
Label1.Text = "Pixel format: " + image1.PixelFormat.ToString()
Catch ex As ArgumentException
MessageBox.Show("There was an error." _
& "Check the path to the image file.")
End Try
End Sub
Bitmap image1;
private void Button1_Click(System.Object sender, System.EventArgs e)
{
try
{
// Retrieve the image.
image1 = new Bitmap(@"C:\Documents and Settings\All Users\"
+ @"Documents\My Music\music.bmp", true);
int x, y;
// Loop through the images pixels to reset color.
for(x=0; x<image1.Width; x++)
{
for(y=0; y<image1.Height; y++)
{
Color pixelColor = image1.GetPixel(x, y);
Color newColor = Color.FromArgb(pixelColor.R, 0, 0);
image1.SetPixel(x, y, newColor);
}
}
// Set the PictureBox to display the image.
PictureBox1.Image = image1;
// Display the pixel format in Label1.
Label1.Text = "Pixel format: "+image1.PixelFormat.ToString();
}
catch(ArgumentException)
{
MessageBox.Show("There was an error." +
"Check the path to the image file.");
}
}
private:
Bitmap^ image1;
void Button1_Click( System::Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
try
{
// Retrieve the image.
image1 = gcnew Bitmap( "C:\\Documents and Settings\\All Users\\"
"Documents\\My Music\\music.bmp",true );
int x;
int y;
// Loop through the images pixels to reset color.
for ( x = 0; x < image1->Width; x++ )
{
for ( y = 0; y < image1->Height; y++ )
{
Color pixelColor = image1->GetPixel( x, y );
Color newColor = Color::FromArgb( pixelColor.R, 0, 0 );
image1->SetPixel( x, y, newColor );
}
}
// Set the PictureBox to display the image.
PictureBox1->Image = image1;
// Display the pixel format in Label1.
Label1->Text = String::Format( "Pixel format: {0}", image1->PixelFormat );
}
catch ( ArgumentException^ )
{
MessageBox::Show( "There was an error."
"Check the path to the image file." );
}
}
private Bitmap image1;
private void button1_Click(Object sender, System.EventArgs e)
{
try {
// Retrieve the image.
image1 = new Bitmap("C:\\Documents and Settings\\All Users\\"
+ "Documents\\My Music\\music.bmp", true);
int x, y;
// Loop through the images pixels to reset color.
for (x = 0; x < image1.get_Width(); x++) {
for (y = 0; y < image1.get_Height(); y++) {
Color pixelColor = image1.GetPixel(x, y);
Color newColor = Color.FromArgb(pixelColor.get_R(), 0, 0);
image1.SetPixel(x, y, newColor);
}
}
// Set the PictureBox to display the image.
pictureBox1.set_Image(image1);
// Display the pixel format in label1.
label1.set_Text("Pixel format: "
+ image1.get_PixelFormat().ToString());
}
catch (ArgumentException exp) {
MessageBox.Show(("There was an error."
+ "Check the path to the image file."));
}
} //button1_Click
Vererbungshierarchie
System.Object
System.MarshalByRefObject
System.Drawing.Image
System.Drawing.Bitmap
System.Drawing.Imaging.Metafile
Threadsicherheit
Alle öffentlichen statischen (Shared in Visual Basic) Member dieses Typs sind threadsicher. Bei Instanzmembern ist die Threadsicherheit nicht gewährleistet.
Plattformen
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile für Pocket PC, Windows Mobile für Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.
Versionsinformationen
.NET Framework
Unterstützt in: 2.0, 1.1, 1.0
.NET Compact Framework
Unterstützt in: 2.0, 1.0