Color.FromKnownColor メソッドとは何？わかりやすく解説 Weblio辞書

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.NET Framework クラスライブラリリファレンス

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Color.FromKnownColor メソッド

指定した定義済みの色から Color 構造体を作成します。

名前空間: System.Drawing
アセンブリ: System.Drawing (system.drawing.dll 内)
構文

Visual Basic (宣言)

Public Shared Function FromKnownColor
 ( _
    color As KnownColor _
) As Color

Visual Basic (使用法)

Dim color As KnownColor
Dim returnValue As Color

returnValue = Color.FromKnownColor(color)

public static Color FromKnownColor (
    KnownColor color
)

C++

public:
static Color FromKnownColor (
    KnownColor color
)

public static Color FromKnownColor (
    KnownColor color
)

JScript

public static function FromKnownColor
 (
    color : KnownColor
) : Color

パラメータ

color: KnownColor 列挙体の要素。

戻り値
このメソッドが作成する Color。

解説

定義済みの色は既知の色とも呼ばれ、KnownColor 列挙体の要素によって表されます。

使用例

次の例は、Windows フォームでの使用を意図してデザインされており、Paint イベントハンドラのパラメータである PaintEventArgse が必要です。このコードは次のアクションを実行します。

比較に使用する Color 構造体のインスタンス、redShade を作成します。
KnownColor 列挙体要素を反復処理して、redShade と同じ明るさの既知の色をすべて検索します。反復処理は、15 の一致が見つかった場合や、ループカウンタの値が直前の KnownColor 要素よりも大きくなった場合に終了します。
各反復処理中、基準と一致する場合は、配列の KnownColor 要素を保存します。
ブラシを使用して四角形を塗りつぶします。

最初の四角形は、redShade が表す色で塗りつぶします。残りの各四角形は、redShade の明るさと一致する KnownColor で塗りつぶされます。

Visual Basic

Public Sub KnownColorBrightnessExample1(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 to store KnownColor values that match the brightness of
 the
    ' 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.GetBrightness()) = (redShade.GetBrightness())
 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.
    ' 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 KnownColorBrightnessExample1(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 brightness 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.GetBrightness() == redShade.GetBrightness())
            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);
    }
}

C++

void KnownColorBrightnessExample1( 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 brightness 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.GetBrightness() == redShade.GetBrightness()
 )
               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 KnownColorBrightnessExample1(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 brightness 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.GetBrightness() == redShade.GetBrightness())
 {
            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);
    }
} //KnownColorBrightnessExample1

プラットフォーム

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0

参照

関連項目
Color 構造体
Color メンバ
System.Drawing 名前空間

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Color.FromKnownColor メソッドとは？わかりやすく解説