Color.GetHue-Methode
Ruft den HSB-Farbtonwert (Hue, Saturation, Brightness = Farbton, Sättigung, Helligkeit) für diese Color-Struktur in Grad ab.
Namespace: System.Drawing
Assembly: System.Drawing (in system.drawing.dll)
Syntax
'Declaration
Public Function GetHue As Single
'Usage
Dim instance As Color
Dim returnValue As Single
returnValue = instance.GetHue
public float GetHue ()
public:
float GetHue ()
public float GetHue ()
public function GetHue () : float
Rückgabewert
Der Farbton dieser Color in Grad. Der Farbton im HSB-Farbraum wird in Grad mit einem Wert zwischen 0.0 und 360.0 angegeben.
Beispiel
Das folgende Codebeispiel ist für die Verwendung mit Windows Forms vorgesehen und erfordert PaintEventArgse, wobei es sich um einen Parameter des Paint-Ereignishandlers handelt. Der Code führt die folgenden Aktionen aus:
Erstellt eine Instanz einer Color-Struktur mit dem Namen
redShade, die für Vergleiche verwendet wird.Durchläuft die KnownColor-Enumerationselemente, um alle bekannten Farben mit demselben Farbton wie
redShadezu suchen. Der Durchlauf wird abgebrochen, wenn 15 Übereinstimmungen gefunden wurden oder der Wert des Schleifenzählers größer als das letzte KnownColor-Element ist.In jedem Durchlauf wird das KnownColor-Element in einem Array gespeichert, sofern es den Kriterien entspricht.
Verwendet einen Pinsel zum Zeichnen von Rechtecken.
Das erste Rechteck wird mit der durch redShade dargestellten Farbe gezeichnet. Alle anderen Rechtecke werden mit einer KnownColor gezeichnet, deren Farbton mit dem von redShade übereinstimmt.
Public Sub GetHueExample(ByVal e As PaintEventArgs)
Dim g As Graphics = e.Graphics
' Color structures. One is used for temporary storage. The other
' is a constant used for comparisons.
Dim someColor As Color = Color.FromArgb(0)
Dim redShade As Color = Color.FromArgb(255, 200, 0, 100)
' Array for KnownColor values that match the hue of redShade
' color.
Dim colorMatches(15) As KnownColor
' Number of matches found.
Dim count As Integer = 0
' Iterate through the KnownColor enums until 15 matches are found.
Dim enumValue As KnownColor
For enumValue = 0 To KnownColor.YellowGreen
someColor = Color.FromKnownColor(enumValue)
If (someColor.GetHue()) = (redShade.GetHue()) Then
colorMatches(count) = enumValue
count += 1
If count > 15 Then
Exit For
End If
End If
Next enumValue
' Display the redShade color and its argb value.
Dim myBrush1 As New SolidBrush(redShade)
Dim myFont As New Font("Arial", 12)
Dim x As Integer = 20
Dim y As Integer = 20
someColor = redShade
g.FillRectangle(myBrush1, x, y, 100, 30)
g.DrawString(someColor.ToString(), myFont, Brushes.Black, _
x + 120, y)
' Iterate through the matches that were found and display each
' color that corresponds with the enum value in the array. Also
' display the name of the KnownColor.
Dim i As Integer
For i = 0 To count - 1
y += 40
someColor = Color.FromKnownColor(colorMatches(i))
myBrush1.Color = someColor
g.FillRectangle(myBrush1, x, y, 100, 30)
g.DrawString(someColor.ToString(), myFont, Brushes.Black, _
x + 120, y)
Next i
End Sub
public void GetHueExample(PaintEventArgs e)
{
Graphics g = e.Graphics;
// Color structures. One is a variable used for temporary storage. The other
// is a constant used for comparisons.
Color someColor = Color.FromArgb(0);
Color redShade = Color.FromArgb(255, 200, 0, 100);
// Array to store KnownColor values that match the hue of the redShade
// color.
KnownColor[] colorMatches = new KnownColor[15];
// Number of matches found.
int count = 0;
// Iterate through the KnownColor enums until 15 matches are found.
for (KnownColor enumValue = 0;
enumValue <= KnownColor.YellowGreen && count < 15; enumValue++)
{
someColor = Color.FromKnownColor(enumValue);
if (someColor.GetHue() == redShade.GetHue())
colorMatches[count++] = enumValue;
}
// Display the redShade color and its argb value.
SolidBrush myBrush1 = new SolidBrush(redShade);
Font myFont = new Font("Arial", 12);
int x = 20;
int y = 20;
someColor = redShade;
g.FillRectangle(myBrush1, x, y, 100, 30);
g.DrawString(someColor.ToString(), myFont, Brushes.Black, x + 120, y);
// Iterate through the matches that were found and display each color that
// corresponds with the enum value in the array. also display the name of
// the KnownColor.
for (int i = 0; i < count; i++)
{
y += 40;
someColor = Color.FromKnownColor(colorMatches[i]);
myBrush1.Color = someColor;
g.FillRectangle(myBrush1, x, y, 100, 30);
g.DrawString(someColor.ToString(), myFont, Brushes.Black, x + 120, y);
}
}
void GetHueExample( PaintEventArgs^ e )
{
Graphics^ g = e->Graphics;
// Color structures. One is a variable used for temporary storage. The other
// is a constant used for comparisons.
Color someColor = Color::FromArgb( 0 );
Color redShade = Color::FromArgb( 255, 200, 0, 100 );
// Array to store KnownColor values that match the hue of the redShade
// color.
array<KnownColor>^colorMatches = gcnew array<KnownColor>(15);
// Number of matches found.
int count = 0;
// Iterate through the KnownColor enums until 15 matches are found.
for ( KnownColor enumValue = (KnownColor)0; enumValue <= KnownColor::YellowGreen && count < 15; enumValue = enumValue + (KnownColor)1 )
{
someColor = Color::FromKnownColor( enumValue );
if ( someColor.GetHue() == redShade.GetHue() )
colorMatches[ count++ ] = enumValue;
}
// Display the redShade color and its argb value.
SolidBrush^ myBrush1 = gcnew SolidBrush( redShade );
System::Drawing::Font^ myFont = gcnew System::Drawing::Font( "Arial",12 );
int x = 20;
int y = 20;
someColor = redShade;
g->FillRectangle( myBrush1, x, y, 100, 30 );
g->DrawString( someColor.ToString(), myFont, Brushes::Black, (float)x + 120, (float)y );
// Iterate through the matches that were found and display each color that
// corresponds with the enum value in the array. also display the name of
// the KnownColor.
for ( int i = 0; i < count; i++ )
{
y += 40;
someColor = Color::FromKnownColor( colorMatches[ i ] );
myBrush1->Color = someColor;
g->FillRectangle( myBrush1, x, y, 100, 30 );
g->DrawString( someColor.ToString(), myFont, Brushes::Black, (float)x + 120, (float)y );
}
}
public void GetHueExample(PaintEventArgs e)
{
Graphics g = e.get_Graphics();
// Color structures. One is a variable used for temporary storage.
// The other is a constant used for comparisons.
Color someColor = Color.FromArgb(0);
Color redShade = Color.FromArgb(255, 200, 0, 100);
// Array to store KnownColor values that match the hue of the redShade
// color.
KnownColor colorMatches[] = new KnownColor[15];
// Number of matches found.
int count = 0;
// Iterate through the KnownColor enums until 15 matches are found.
for (KnownColor enumValue = (KnownColor)0;
(enumValue.CompareTo(KnownColor.YellowGreen) <= 0)
&& (count < 15); enumValue++) {
someColor = Color.FromKnownColor(enumValue);
if (someColor.GetHue() == redShade.GetHue()) {
colorMatches.set_Item(count++, enumValue);
}
}
// Display the redShade color and its argb value.
SolidBrush myBrush1 = new SolidBrush(redShade);
Font myFont = new Font("Arial", 12);
int x = 20;
int y = 20;
someColor = redShade;
g.FillRectangle(myBrush1, x, y, 100, 30);
g.DrawString(someColor.ToString(), myFont, Brushes.get_Black(),
x + 120, y);
// Iterate through the matches that were found and display each color
// that corresponds with the enum value in the array. also display the
// name of the KnownColor.
for (int i = 0; i < count; i++) {
y += 40;
someColor = Color.FromKnownColor(
(KnownColor)colorMatches.get_Item(i));
myBrush1.set_Color(someColor);
g.FillRectangle(myBrush1, x, y, 100, 30);
g.DrawString(someColor.ToString(), myFont, Brushes.get_Black(),
x + 120, y);
}
} //GetHueExample
Plattformen
Windows 98, Windows 2000 SP4, Windows Millennium Edition, 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