Color.ToArgb メソッド

.NET Framework クラス ライブラリ リファレンス

Color.ToArgb メソッド

この Color 構造体の 32 ビットの ARGB 値を取得します。

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

Visual Basic (宣言)

Public Function ToArgb As
 Integer

Visual Basic (使用法)

Dim instance As Color
Dim returnValue As Integer

returnValue = instance.ToArgb

C#

public int ToArgb ()

C++

public:
int ToArgb ()

J#

public int ToArgb ()

JScript

public function ToArgb () : int

戻り値
この Color の 32 ビットの ARGB 値。

解説

32 ビットの ARGB 値のバイト順は AARRGGBB です。AA で表している最上位バイト (MSB) はアルファ コンポーネントの値です。RR、GG、BB で表している 2 番目、3 番目、4 番目のバイトは、それぞれ赤、緑、青のコンポーネントです。

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。

• KnownColor 列挙体要素を反復処理して、値が 0 以外の緑のコンポーネントと値が 0 の赤のコンポーネントを持ち、システム カラーでない既知の色をすべて検索します。

• 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。

各四角形は、最初の箇条書き項目の基準に一致する KnownColor で塗りつぶされます。KnownColor の名前とその要素の値も表示されます。

この例では、一部の既知の色とその名前、およびそれぞれの 4 つのコンポーネントの値を示します。ToArgb メソッドは、コンポーネントの値を表示するための準備手順として使用されます。

Visual Basic

Public Sub ToArgbToStringExample1(ByVal
 e As PaintEventArgs)
    Dim g As Graphics = e.Graphics

    ' Color structure used for temporary storage.
    Dim someColor As Color = Color.FromArgb(0)

    ' Array to store KnownColor values that match the criteria.
    Dim colorMatches(167) As KnownColor

    ' Number of matches found.
    Dim count As Integer
 = 0

    ' Iterate through KnownColor enums to find all corresponding colors
    ' that have a non-zero green component and zero-valued red
    ' component and that are not system colors.
    Dim enumValue As KnownColor
    For enumValue = 0 To KnownColor.YellowGreen
        someColor = Color.FromKnownColor(enumValue)
        If someColor.G <> 0 And someColor.R
 = 0 And _
        Not someColor.IsSystemColor Then
            colorMatches(count) = enumValue
            count += 1
        End If
    Next enumValue
    Dim myBrush1 As New
 SolidBrush(someColor)
    Dim myFont As New Font("Arial",
 9)
    Dim x As Integer = 40
    Dim y As Integer = 40

    ' Iterate through the matches found and display each color that
    ' corresponds with the enum value in the array. Also display the
    ' name of the KnownColor and the ARGB components.
    Dim i As Integer
    For i = 0 To count - 1

        ' Display the color.
        someColor = Color.FromKnownColor(colorMatches(i))
        myBrush1.Color = someColor
        g.FillRectangle(myBrush1, x, y, 50, 30)

        ' Display KnownColor name and four component values. To display
        ' component values:  Use the ToArgb method to get the 32-bit
        ' ARGB value of someColor (created from a KnownColor). Create
        ' a Color structure from the 32-bit ARGB value and set someColor
        ' equal to this new Color structure. Then use the ToString method
        ' to convert it to a string.
        g.DrawString(someColor.ToString(), myFont, Brushes.Black, _
        x + 55, y)
        someColor = Color.FromArgb(someColor.ToArgb())
        g.DrawString(someColor.ToString(), myFont, Brushes.Black, _
        x + 55, y + 15)
        y += 40
    Next i
End Sub

C#

public void ToArgbToStringExample1(PaintEventArgs
 e)
{
    Graphics     g = e.Graphics;
             
    // Color structure used for temporary storage.
    Color   someColor = Color.FromArgb(0);
             
    // Array to store KnownColor values that match the criteria.
    KnownColor[]  colorMatches = new KnownColor[167];
    
    // Number of matches found.
    int  count = 0; 
  
    // Iterate through the KnownColor enums to find all corresponding
 colors
    // that have a nonzero green component and zero-value red component
 and
    // that are not system colors.
    for (KnownColor enumValue = 0;
        enumValue <= KnownColor.YellowGreen; enumValue++)
    {
        someColor = Color.FromKnownColor(enumValue);
        if (someColor.G != 0 && someColor.R == 0 &&
 !someColor.IsSystemColor)
            colorMatches[count++] = enumValue;
    }
    SolidBrush  myBrush1 = new SolidBrush(someColor);
    Font        myFont = new Font("Arial", 9);
    int         x = 40;
    int         y = 40;
             
    // 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 and the ARGB components.
    for (int i = 0; i < count; i++)
    {
             
        // Display the color.
        someColor = Color.FromKnownColor(colorMatches[i]);
        myBrush1.Color = someColor;
        g.FillRectangle(myBrush1, x, y, 50, 30);
             
        // Display KnownColor name and the four component values. To
 display the
        // component values:  Use the ToArgb method to get the 32-bit
 ARGB value
        // of someColor, which was created from a KnownColor. Then create
 a
        // Color structure from the 32-bit ARGB value and set someColor
 equal to
        // this new Color structure. Then use the ToString method to
 convert it to
        // a string.
        g.DrawString(someColor.ToString(), myFont, Brushes.Black, x + 55, y);
        someColor = Color.FromArgb(someColor.ToArgb());
        g.DrawString(someColor.ToString(), myFont, Brushes.Black, x + 55, y + 15);
        y += 40;
    }
}

C++

void ToArgbToStringExample1( PaintEventArgs^ e )
{
   Graphics^ g = e->Graphics;

   // Color structure used for temporary storage.
   Color someColor = Color::FromArgb( 0 );

   // Array to store KnownColor values that match the criteria.
   array<KnownColor>^colorMatches = gcnew array<KnownColor>(167);

   // Number of matches found.
   int count = 0;

   // Iterate through the KnownColor enums to find all corresponding
 colors
   // that have a nonzero green component and zero-value red component
 and
   // that are not system colors.
   for ( KnownColor enumValue = (KnownColor)0; enumValue <=
 KnownColor::YellowGreen; enumValue = enumValue + (KnownColor)1 )
   {
      someColor = Color::FromKnownColor( enumValue );
      if ( someColor.G != 0 && someColor.R == 0 &&
  !someColor.IsSystemColor )
               colorMatches[ count++ ] = enumValue;
   }
   SolidBrush^ myBrush1 = gcnew SolidBrush( someColor );
   System::Drawing::Font^ myFont = gcnew System::Drawing::Font( "Arial",9
 );
   int x = 40;
   int y = 40;

   // 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 and the ARGB components.
   for ( int i = 0; i < count; i++ )
   {
      // Display the color.
      someColor = Color::FromKnownColor( colorMatches[ i ] );
      myBrush1->Color = someColor;
      g->FillRectangle( myBrush1, x, y, 50, 30 );

      // Display KnownColor name and the four component values. To display
 the
      // component values:  Use the ToArgb method to get the 32-bit
 ARGB value
      // of someColor, which was created from a KnownColor. Then create
 a
      // Color structure from the 32-bit ARGB value and set someColor
 equal to
      // this new Color structure. Then use the ToString method to convert
 it to
      // a string.
      g->DrawString( someColor.ToString(), myFont, Brushes::Black, (float)x
 + 55, (float)y );
      someColor = Color::FromArgb( someColor.ToArgb() );
      g->DrawString( someColor.ToString(), myFont, Brushes::Black, (float)x
 + 55, (float)y + 15 );
      y += 40;
   }
}

J#

public void ToArgbToStringExample1(PaintEventArgs
 e)
{
    Graphics g = e.get_Graphics();

    // Color structure used for temporary storage.
    Color someColor = Color.FromArgb(0);

    // Array to store KnownColor values that match the criteria.
    KnownColor colorMatches[] = new KnownColor[167];

    // Number of matches found.
    int count = 0;

    // Iterate through the KnownColor enums to find all corresponding
 
    // colors that have a nonzero green component and zero-value red
 
    // component and that are not system colors.
    for (KnownColor enumValue = (KnownColor)0; 
        enumValue.CompareTo(KnownColor.YellowGreen) <= 0; enumValue++) {

        someColor = Color.FromKnownColor(enumValue);
        if (someColor.get_G() != 0 && someColor.get_R()
 == 0 && 
            !(someColor.get_IsSystemColor())) {
            colorMatches.set_Item(count++, enumValue);
        }
    }

    SolidBrush myBrush1 = new SolidBrush(someColor);
    Font myFont = new Font("Arial", 9);
    int x = 40;
    int y = 40;

    // 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 and the ARGB components.
    for (int i = 0; i < count; i++) {
        // Display the color.
        someColor = Color.FromKnownColor(
            (KnownColor)colorMatches.get_Item(i));
        myBrush1.set_Color(someColor);
        g.FillRectangle(myBrush1, x, y, 50, 30);

        // Display KnownColor name and the four component values. 
        // To display the component values:  Use the ToArgb method to
 get 
        // the 32-bit ARGB value of someColor, which was created from
 a
        //  KnownColor. Then create a Color structure from the 32-bit
 
        // ARGB value and set someColor equal to this new Color structure.
 
        // Then use the ToString method to convert it to a string.
        g.DrawString(someColor.ToString(), myFont, Brushes.get_Black(), 
            x + 55, y);
        someColor = Color.FromArgb(someColor.ToArgb());
        g.DrawString(someColor.ToString(), myFont, Brushes.get_Black(), 
            x + 55, y + 15);
        y += 40;
    }
} //ToArgbToStringExample1

プラットフォーム

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0
.NET Compact Framework
サポート対象 : 2.0、1.0

参照

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