Assembly : System.Drawing (dans system.drawing.dll)
SyntaxePublic Function ToArgb As Integer
Dim instance As Color Dim returnValue As Integer returnValue = instance.ToArgb
public int ToArgb ()
public: int ToArgb ()
public int ToArgb ()
public function ToArgb () : int
Valeur de retour
Valeur ARVB 32 bits de ce Color.
NotesL'ordre d'octets de la valeur ARVB 32 bits est AARRVVBB. L'octet le plus significatif, représenté par AA, correspond à la valeur du composant alpha. Les deuxième, troisième et quatrième octets, représentés par RR, VV et BB, correspondent respectivement aux composants de couleur rouge, vert et bleu.
ExempleL'exemple de code suivant est destiné à être utilisé avec Windows Forms et nécessite PaintEventArgse, qui est un paramètre du gestionnaire d'événements Paint. Le code exécute les actions suivantes :
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Parcourt les éléments de l'énumération KnownColor pour rechercher toutes les couleurs connues dont le composant vert a une valeur différente de zéro et le composant rouge a une valeur égale à zéro, et qui ne sont pas des couleurs système.
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Durant chaque itération, enregistre l'élément KnownColor dans un tableau, s'il répond aux critères.
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Peint des rectangles à l'aide d'un pinceau.
Chaque rectangle est peint à l'aide d'un KnownColor correspondant aux critères spécifiés au niveau de la première puce. Le nom de KnownColor et les valeurs de ses composants sont également affichés.
Cet exemple affiche quelques couleurs connues ainsi que leurs noms et les valeurs de leurs quatre composants. La méthode ToArgb est utilisée comme étape préliminaire pour afficher la valeur des composants.
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
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; } }
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; } }
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
Plates-formesWindows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile pour Pocket PC, Windows Mobile pour Smartphone, Windows Server 2003, Windows XP Édition Media Center, Windows XP Professionnel Édition x64, Windows XP SP2, Windows XP Starter Edition
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