Color.FromArgb 方法

參考

定義

命名空間:: System.Drawing

組件:: System.Drawing.Primitives.dll

組件:: System.Drawing.dll

組件:: netstandard.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

從四個 8 位 ARGB 元件（Alpha、紅色、綠色和藍色）值建立 Color 結構。

多載

FromArgb(Int32, Int32, Int32, Int32)	從四個 ARGB 元件（Alpha、紅色、綠色和藍色）值建立 Color 結構。雖然此方法允許針對每個元件傳遞 32 位值，但每個元件的值限製為 8 位。
FromArgb(Int32, Int32, Int32)	從指定的8位色彩值建立 Color 結構（紅色、綠色和藍色）。 Alpha 值隱含為 255 （完全不透明）。雖然此方法允許針對每個色彩元件傳遞 32 位值，但每個元件的值限製為 8 位。
FromArgb(Int32, Color)	從指定的 Color 結構建立 Color 結構，但使用新的指定 Alpha 值。雖然這個方法允許針對 Alpha 值傳遞 32 位值，但此值限製為 8 位。
FromArgb(Int32)	從 32 位 ARGB 值建立 Color 結構。

FromArgb(Int32, Int32, Int32, Int32)

來源:: Color.cs

來源:: Color.cs

來源:: Color.cs

從四個 ARGB 元件（Alpha、紅色、綠色和藍色）值建立 Color 結構。雖然此方法允許針對每個元件傳遞 32 位值，但每個元件的值限製為 8 位。

public:
 static System::Drawing::Color FromArgb(int alpha, int red, int green, int blue);

public static System.Drawing.Color FromArgb (int alpha, int red, int green, int blue);

static member FromArgb : int * int * int * int -> System.Drawing.Color

Public Shared Function FromArgb (alpha As Integer, red As Integer, green As Integer, blue As Integer) As Color

參數

alpha: Int32

Alpha元件。有效值為 0 到 255。

red: Int32

紅色元件。有效值為 0 到 255。

green: Int32

綠色元件。有效值為 0 到 255。

blue: Int32

藍色元件。有效值為 0 到 255。

傳回

Color

這個方法所建立的 Color。

例外狀況

ArgumentException

alpha、red、green或 blue 小於 0 或大於 255。

範例

下列程式代碼範例是專為搭配 Windows Forms 使用而設計，而且需要 PaintEventArgse，這是 Paint 事件處理程式的參數。程式代碼會執行下列動作：

建立三個筆刷，每個筆刷各有不同的色彩。用來建立筆刷的每個 Color 結構都是從四個元件值建立的（Alpha、紅色、綠色、藍色）。
使用虛數三角形來放置三個圓圈。
繪製三個重疊的圓形，每個圓形都置中於三角形的一個頂點上，並針對每個圓形使用不同的筆刷。

void FromArgb1( PaintEventArgs^ e )
{
   Graphics^ g = e->Graphics;

   // Transparent red, green, and blue brushes.
   SolidBrush^ trnsRedBrush = gcnew SolidBrush( Color::FromArgb( 120, 255, 0, 0 ) );
   SolidBrush^ trnsGreenBrush = gcnew SolidBrush( Color::FromArgb( 120, 0, 255, 0 ) );
   SolidBrush^ trnsBlueBrush = gcnew SolidBrush( Color::FromArgb( 120, 0, 0, 255 ) );

   // Base and height of the triangle that is used to position the
   // circles. Each vertex of the triangle is at the center of one of the
   // 3 circles. The base is equal to the diameter of the circles.
   float triBase = 100;
   float triHeight = (float)Math::Sqrt( 3 * (triBase * triBase) / 4 );

   // Coordinates of first circle's bounding rectangle.
   float x1 = 40;
   float y1 = 40;

   // Fill 3 over-lapping circles. Each circle is a different color.
   g->FillEllipse( trnsRedBrush, x1, y1, 2 * triHeight, 2 * triHeight );
   g->FillEllipse( trnsGreenBrush, x1 + triBase / 2, y1 + triHeight, 2 * triHeight, 2 * triHeight );
   g->FillEllipse( trnsBlueBrush, x1 + triBase, y1, 2 * triHeight, 2 * triHeight );
}

public void FromArgb1(PaintEventArgs e)
{
    Graphics     g = e.Graphics;
             
    // Transparent red, green, and blue brushes.
    SolidBrush trnsRedBrush = new SolidBrush(Color.FromArgb(120, 255, 0, 0));
    SolidBrush trnsGreenBrush = new SolidBrush(Color.FromArgb(120, 0, 255, 0));
    SolidBrush trnsBlueBrush = new SolidBrush(Color.FromArgb(120, 0, 0, 255));
             
    // Base and height of the triangle that is used to position the
    // circles. Each vertex of the triangle is at the center of one of the
    // 3 circles. The base is equal to the diameter of the circles.
    float   triBase = 100;
    float   triHeight = (float)Math.Sqrt(3*(triBase*triBase)/4);
             
    // Coordinates of first circle's bounding rectangle.
    float   x1 = 40;
    float   y1 = 40;
             
    // Fill 3 over-lapping circles. Each circle is a different color.
    g.FillEllipse(trnsRedBrush, x1, y1, 2*triHeight, 2*triHeight);
    g.FillEllipse(trnsGreenBrush, x1 + triBase/2, y1 + triHeight,
        2*triHeight, 2*triHeight);
    g.FillEllipse(trnsBlueBrush, x1 + triBase, y1, 2*triHeight, 2*triHeight);
}

Public Sub FromArgb1(ByVal e As PaintEventArgs)
    Dim g As Graphics = e.Graphics

    ' Transparent red, green, and blue brushes.
    Dim trnsRedBrush As New SolidBrush(Color.FromArgb(120, 255, 0, 0))
    Dim trnsGreenBrush As New SolidBrush(Color.FromArgb(120, 0, _
    255, 0))
    Dim trnsBlueBrush As New SolidBrush(Color.FromArgb(120, 0, 0, 255))

    ' Base and height of the triangle that is used to position the
    ' circles. Each vertex of the triangle is at the center of one of
    ' the 3 circles. The base is equal to the diameter of the circle.
    Dim triBase As Single = 100
    Dim triHeight As Single = CSng(Math.Sqrt((3 * (triBase * _
    triBase) / 4)))

    ' Coordinates of first circle's bounding rectangle.
    Dim x1 As Single = 40
    Dim y1 As Single = 40

    ' Fill 3 over-lapping circles. Each circle is a different color.
    g.FillEllipse(trnsRedBrush, x1, y1, 2 * triHeight, 2 * triHeight)
    g.FillEllipse(trnsGreenBrush, x1 + triBase / 2, y1 + triHeight, _
    2 * triHeight, 2 * triHeight)
    g.FillEllipse(trnsBlueBrush, x1 + triBase, y1, 2 * triHeight, _
    2 * triHeight)
End Sub

備註

若要建立不透明的色彩，請將 alpha 設為 255。若要建立半透明色彩，請將 alpha 設為 1 到 254 的任何值。

適用於

FromArgb(Int32, Int32, Int32)

來源:: Color.cs

來源:: Color.cs

來源:: Color.cs

從指定的8位色彩值建立 Color 結構（紅色、綠色和藍色）。 Alpha 值隱含為 255 （完全不透明）。雖然此方法允許針對每個色彩元件傳遞 32 位值，但每個元件的值限製為 8 位。

public:
 static System::Drawing::Color FromArgb(int red, int green, int blue);

public static System.Drawing.Color FromArgb (int red, int green, int blue);

static member FromArgb : int * int * int -> System.Drawing.Color

Public Shared Function FromArgb (red As Integer, green As Integer, blue As Integer) As Color

參數

red: Int32

新 Color的紅色元件值。有效值為 0 到 255。

green: Int32

新 Color的綠色元件值。有效值為 0 到 255。

blue: Int32

新 Color的藍色元件值。有效值為 0 到 255。

傳回

Color

這個方法所建立的 Color。

例外狀況

ArgumentException

red、green或 blue 小於 0 或大於 255。

範例

下列程式代碼範例是專為搭配 Windows Forms 使用而設計，而且需要 PaintEventArgse，這是 Paint 事件處理程式的參數。程式代碼會執行下列動作：

從三個色彩元件值建立 Color 結構（紅色、綠色、藍色）。會建立三個 Color 結構，每個主要色彩各一個。
逐一查看 Alpha 值範圍，變更色彩的 Alpha 值。
在每個反覆項目期間，將筆刷的色彩設定為修改的色彩，並繪製矩形以顯示色彩。
針對每個主要色彩重複步驟 2 和 3。

Alpha 值永遠不會完全不透明，而且矩形會重疊，因此您會得到色彩組合效果。

void FromArgb2( PaintEventArgs^ e )
{
   Graphics^ g = e->Graphics;

   // Opaque colors (alpha value defaults to 255 -- max value).
   Color red = Color::FromArgb( 255, 0, 0 );
   Color green = Color::FromArgb( 0, 255, 0 );
   Color blue = Color::FromArgb( 0, 0, 255 );

   // Solid brush initialized to red.
   SolidBrush^ myBrush = gcnew SolidBrush( red );
   int alpha;

   // x coordinate of first red rectangle
   int x = 50;

   // y coordinate of first red rectangle
   int y = 50;

   // Fill rectangles with red, varying the alpha value from 25 to 250.
   for ( alpha = 25; alpha <= 250; alpha += 25 )
   {
      myBrush->Color = Color::FromArgb( alpha, red );
      g->FillRectangle( myBrush, x, y, 50, 100 );
      g->FillRectangle( myBrush, x, y + 250, 50, 50 );
      x += 50;
   }
   x = 50;

   // y coordinate of first green rectangle.
   y += 50;

   // Fill rectangles with green, varying the alpha value from 25 to 250.
   for ( alpha = 25; alpha <= 250; alpha += 25 )
   {
      myBrush->Color = Color::FromArgb( alpha, green );
      g->FillRectangle( myBrush, x, y, 50, 150 );
      x += 50;
   }
   x = 50;

   // y coordinate of first blue rectangle.
   y += 100;

   // Fill rectangles with blue, varying the alpha value from 25 to 250.
   for ( alpha = 25; alpha <= 250; alpha += 25 )
   {
      myBrush->Color = Color::FromArgb( alpha, blue );
      g->FillRectangle( myBrush, x, y, 50, 150 );
      x += 50;
   }
}

public void FromArgb2(PaintEventArgs e)
{
    Graphics     g = e.Graphics;
             
    // Opaque colors (alpha value defaults to 255 -- max value).
    Color red = Color.FromArgb(255, 0, 0);
    Color green = Color.FromArgb(0, 255, 0);
    Color blue = Color.FromArgb(0, 0, 255);
             
    // Solid brush initialized to red.
    SolidBrush  myBrush = new SolidBrush(red);
    int alpha;

    // x coordinate of first red rectangle
    int x = 50;         
    
    // y coordinate of first red rectangle
    int y = 50;         
                   
    // Fill rectangles with red, varying the alpha value from 25 to 250.
    for (alpha = 25; alpha <= 250; alpha += 25)
    {
        myBrush.Color = Color.FromArgb(alpha, red);
        g.FillRectangle(myBrush, x, y, 50, 100);
        g.FillRectangle(myBrush, x, y + 250, 50, 50);
        x += 50;
    }
    // x coordinate of first green rectangle.
    x = 50;             
    
    // y coordinate of first green rectangle.
    y += 50;            
                      
    // Fill rectangles with green, varying the alpha value from 25 to 250.
    for (alpha = 25; alpha <= 250; alpha += 25)
    {
        myBrush.Color = Color.FromArgb(alpha, green);
        g.FillRectangle(myBrush, x, y, 50, 150);
        x += 50;
    }
    // x coordinate of first blue rectangle.
    x = 50;             
    
    // y coordinate of first blue rectangle.
    y += 100;           
             
    // Fill rectangles with blue, varying the alpha value from 25 to 250.
    for (alpha = 25; alpha <= 250; alpha += 25)
    {
        myBrush.Color = Color.FromArgb(alpha, blue);
        g.FillRectangle(myBrush, x, y, 50, 150);
        x += 50;
    }
}

Public Sub FromArgb2(ByVal e As PaintEventArgs)
    Dim g As Graphics = e.Graphics

    ' Opaque colors (alpha value defaults to 255 -- max value).
    Dim red As Color = Color.FromArgb(255, 0, 0)
    Dim green As Color = Color.FromArgb(0, 255, 0)
    Dim blue As Color = Color.FromArgb(0, 0, 255)

    ' Solid brush initialized to red.
    Dim myBrush As New SolidBrush(red)
    Dim alpha As Integer

    ' x coordinate of first red rectangle.
    Dim x As Integer = 50

    ' y coordinate of first red rectangle.
    Dim y As Integer = 50

    ' Fill rectangles with red, varying the alpha value from 25 to 250.
    For alpha = 25 To 250 Step 25
        myBrush.Color = Color.FromArgb(alpha, red)
        g.FillRectangle(myBrush, x, y, 50, 100)
        g.FillRectangle(myBrush, x, y + 250, 50, 50)
        x += 50
    Next alpha

    ' x coordinate of first green rectangle.
    x = 50

    ' y coordinate of first green rectangle.
    y += 50


    ' Fill rectangles with green, varying alpha value from 25 to 250.
    For alpha = 25 To 250 Step 25
        myBrush.Color = Color.FromArgb(alpha, green)
        g.FillRectangle(myBrush, x, y, 50, 150)
        x += 50
    Next alpha

    ' x coordinate of first blue rectangle.
    x = 50

    ' y coordinate of first blue rectangle.
    y += 100

    ' Fill rectangles with blue, varying alpha value from 25 to 250.
    For alpha = 25 To 250 Step 25
        myBrush.Color = Color.FromArgb(alpha, blue)
        g.FillRectangle(myBrush, x, y, 50, 150)
        x += 50
    Next alpha
End Sub

適用於

FromArgb(Int32, Color)

來源:: Color.cs

來源:: Color.cs

來源:: Color.cs

從指定的 Color 結構建立 Color 結構，但使用新的指定 Alpha 值。雖然這個方法允許針對 Alpha 值傳遞 32 位值，但此值限製為 8 位。

public:
 static System::Drawing::Color FromArgb(int alpha, System::Drawing::Color baseColor);

public static System.Drawing.Color FromArgb (int alpha, System.Drawing.Color baseColor);

static member FromArgb : int * System.Drawing.Color -> System.Drawing.Color

Public Shared Function FromArgb (alpha As Integer, baseColor As Color) As Color

參數

alpha: Int32

新 Color的 Alpha 值。有效值為 0 到 255。

baseColor: Color

要從中建立新 Color Color。

傳回

Color

這個方法所建立的 Color。

例外狀況

ArgumentException

alpha 小於0或大於255。

範例

下列程式代碼範例是專為搭配 Windows Forms 使用而設計，而且需要 PaintEventArgse，這是 Paint 事件處理程式的參數。程式代碼會執行下列動作：

從三個色彩元件值建立 Color 結構（紅色、綠色、藍色）。會建立三個 Color 結構，每個主要色彩各一個。
逐一查看 Alpha 值範圍，變更色彩的 Alpha 值。
在每個反覆項目期間，將筆刷的色彩設定為修改的色彩，並繪製矩形以顯示色彩。
針對每個主要色彩重複步驟 2 和 3。

Alpha 值永遠不會完全不透明，而且矩形會重疊，因此您會得到色彩組合效果。

void FromArgb3( PaintEventArgs^ e )
{
   Graphics^ g = e->Graphics;

   // Opaque colors (alpha value defaults to 255 -- max value).
   Color red = Color::FromArgb( 255, 0, 0 );
   Color green = Color::FromArgb( 0, 255, 0 );
   Color blue = Color::FromArgb( 0, 0, 255 );

   // Solid brush initialized to red.
   SolidBrush^ myBrush = gcnew SolidBrush( red );
   int alpha;

   // x coordinate of first red rectangle
   int x = 50;

   // y coordinate of first red rectangle
   int y = 50;

   // Fill rectangles with red, varying the alpha value from 25 to 250.
   for ( alpha = 25; alpha <= 250; alpha += 25 )
   {
      myBrush->Color = Color::FromArgb( alpha, red );
      g->FillRectangle( myBrush, x, y, 50, 100 );
      g->FillRectangle( myBrush, x, y + 250, 50, 50 );
      x += 50;
   }
   x = 50;

   // y coordinate of first green rectangle
   y += 50;

   // Fill rectangles with green, varying the alpha value from 25 to 250.
   for ( alpha = 25; alpha <= 250; alpha += 25 )
   {
      myBrush->Color = Color::FromArgb( alpha, green );
      g->FillRectangle( myBrush, x, y, 50, 150 );
      x += 50;
   }
   x = 50;

   // y coordinate of first blue rectangle
   y += 100;

   // Fill rectangles with blue, varying the alpha value from 25 to 250.
   for ( alpha = 25; alpha <= 250; alpha += 25 )
   {
      myBrush->Color = Color::FromArgb( alpha, blue );
      g->FillRectangle( myBrush, x, y, 50, 150 );
      x += 50;
   }
}

public void FromArgb3(PaintEventArgs e)
{
    Graphics     g = e.Graphics;
             
    // Opaque colors (alpha value defaults to 255 -- max value).
    Color red = Color.FromArgb(255, 0, 0);
    Color green = Color.FromArgb(0, 255, 0);
    Color blue = Color.FromArgb(0, 0, 255);
             
    // Solid brush initialized to red.
    SolidBrush  myBrush = new SolidBrush(red);
    int alpha;
    
    // x coordinate of first red rectangle
    int x = 50;         
    
    // y coordinate of first red rectangle
    int y = 50;         
    
    // Fill rectangles with red, varying the alpha value from 25 to 250.
    for (alpha = 25; alpha <= 250; alpha += 25)
    {
        myBrush.Color = Color.FromArgb(alpha, red);
        g.FillRectangle(myBrush, x, y, 50, 100);
        g.FillRectangle(myBrush, x, y + 250, 50, 50);
        x += 50;
    }
    // x coordinate of first green rectangle
    x = 50;             
    
    // y coordinate of first green rectangle
    y += 50;            
    
    // Fill rectangles with green, varying the alpha value from 25 to 250.
    for (alpha = 25; alpha <= 250; alpha += 25)
    {
        myBrush.Color = Color.FromArgb(alpha, green);
        g.FillRectangle(myBrush, x, y, 50, 150);
        x += 50;
    }
    // x coordinate of first blue rectangle.
    x = 50; 
    
     // y coordinate of first blue rectangle
    y += 100;           

    // Fill rectangles with blue, varying the alpha value from 25 to 250.
    for (alpha = 25; alpha <= 250; alpha += 25)
    {
        myBrush.Color = Color.FromArgb(alpha, blue);
        g.FillRectangle(myBrush, x, y, 50, 150);
        x += 50;
    }
}

Public Sub FromArgb3(ByVal e As PaintEventArgs)
    Dim g As Graphics = e.Graphics

    ' Opaque colors (alpha value defaults to 255 -- max value).
    Dim red As Color = Color.FromArgb(255, 0, 0)
    Dim green As Color = Color.FromArgb(0, 255, 0)
    Dim blue As Color = Color.FromArgb(0, 0, 255)

    ' Solid brush initialized to red.
    Dim myBrush As New SolidBrush(red)
    Dim alpha As Integer

    ' x coordinate of first red rectangle.
    Dim x As Integer = 50

    ' y coordinate of first red rectangle.
    Dim y As Integer = 50

    ' Fill rectangles with red, varying the alpha value from 25 to 250.
    For alpha = 25 To 250 Step 25
        myBrush.Color = Color.FromArgb(alpha, red)
        g.FillRectangle(myBrush, x, y, 50, 100)
        g.FillRectangle(myBrush, x, y + 250, 50, 50)
        x += 50
    Next alpha

    ' x coordinate of first green rectangle.
    x = 50

    ' y coordinate of first green rectangle.
    y += 50

    ' Fill rectangles with green, varying alpha value from 25 to 250.
    For alpha = 25 To 250 Step 25
        myBrush.Color = Color.FromArgb(alpha, green)
        g.FillRectangle(myBrush, x, y, 50, 150)
        x += 50
    Next alpha

    ' x coordinate of first blue rectangle.
    x = 50

    ' y coordinate of first blue rectangle.
    y += 100

    ' Fill rectangles with blue, varying alpha value from 25 to 250.
    For alpha = 25 To 250 Step 25
        myBrush.Color = Color.FromArgb(alpha, blue)
        g.FillRectangle(myBrush, x, y, 50, 150)
        x += 50
    Next alpha
End Sub

備註

若要建立不透明的色彩，請將 alpha 設為 255。若要建立半透明色彩，請將 alpha 設為 1 到 254 的任何值。

適用於

FromArgb(Int32)

來源:: Color.cs

來源:: Color.cs

來源:: Color.cs

從 32 位 ARGB 值建立 Color 結構。

public:
 static System::Drawing::Color FromArgb(int argb);

public static System.Drawing.Color FromArgb (int argb);

static member FromArgb : int -> System.Drawing.Color

Public Shared Function FromArgb (argb As Integer) As Color

參數

argb: Int32

指定 32 位 ARGB 值的值。

傳回

Color

這個方法所建立 Color 結構。

範例

下列程式代碼範例是專為搭配 Windows Forms 使用而設計，而且需要 PaintEventArgse，這是 Paint 事件處理程式的參數。程式代碼會執行下列動作：

建立三個筆刷，每個筆刷各有不同的色彩。用來建立筆刷的每個 Color 結構都是從 32 位 ARGB 值建立。
使用虛數三角形來放置三個圓圈。
繪製三個重疊的圓形，每個圓形都置中於三角形的一個頂點上，並針對每個圓形使用不同的筆刷。

void FromArgb4( PaintEventArgs^ e )
{
   Graphics^ g = e->Graphics;

   // Transparent red, green, and blue brushes.
   SolidBrush^ trnsRedBrush = gcnew SolidBrush( Color::FromArgb( 0x78FF0000 ) );
   SolidBrush^ trnsGreenBrush = gcnew SolidBrush( Color::FromArgb( 0x7800FF00 ) );
   SolidBrush^ trnsBlueBrush = gcnew SolidBrush( Color::FromArgb( 0x780000FF ) );

   // Base and height of the triangle that is used to position the
   // circles. Each vertex of the triangle is at the center of one of the
   // 3 circles. The base is equal to the diameter of the circles.
   float triBase = 100;
   float triHeight = (float)Math::Sqrt( 3 * (triBase * triBase) / 4 );

   // coordinates of first circle's bounding rectangle.
   float x1 = 40;
   float y1 = 40;

   // Fill 3 over-lapping circles. Each circle is a different color.
   g->FillEllipse( trnsRedBrush, x1, y1, 2 * triHeight, 2 * triHeight );
   g->FillEllipse( trnsGreenBrush, x1 + triBase / 2, y1 + triHeight, 2 * triHeight, 2 * triHeight );
   g->FillEllipse( trnsBlueBrush, x1 + triBase, y1, 2 * triHeight, 2 * triHeight );
}

public void FromArgb4(PaintEventArgs e)
{
    Graphics     g = e.Graphics;
             
    // Transparent red, green, and blue brushes.
    SolidBrush trnsRedBrush = new SolidBrush(Color.FromArgb(0x78FF0000));
    SolidBrush trnsGreenBrush = new SolidBrush(Color.FromArgb(0x7800FF00));
    SolidBrush trnsBlueBrush = new SolidBrush(Color.FromArgb(0x780000FF));
             
    // Base and height of the triangle that is used to position the
    // circles. Each vertex of the triangle is at the center of one of the
    // 3 circles. The base is equal to the diameter of the circles.
    float   triBase = 100;
    float   triHeight = (float)Math.Sqrt(3*(triBase*triBase)/4);
             
    // coordinates of first circle's bounding rectangle.
    float   x1 = 40;
    float   y1 = 40;
             
    // Fill 3 over-lapping circles. Each circle is a different color.
    g.FillEllipse(trnsRedBrush, x1, y1, 2*triHeight, 2*triHeight);
    g.FillEllipse(trnsGreenBrush, x1 + triBase/2, y1 + triHeight,
        2*triHeight, 2*triHeight);
    g.FillEllipse(trnsBlueBrush, x1 + triBase, y1, 2*triHeight, 2*triHeight);
}

Public Sub FromArgb4(ByVal e As PaintEventArgs)
    Dim g As Graphics = e.Graphics

    ' Transparent red, green, and blue brushes.
    Dim trnsRedBrush As New SolidBrush(Color.FromArgb(&H78FF0000))
    Dim trnsGreenBrush As New SolidBrush(Color.FromArgb(&H7800FF00))
    Dim trnsBlueBrush As New SolidBrush(Color.FromArgb(&H780000FF))

    ' Base and height of the triangle that is used to position the
    ' circles. Each vertex of the triangle is at the center of one of
    ' the 3 circles. The base is equal to the diameter of the circle.
    Dim triBase As Single = 100
    Dim triHeight As Single = CSng(Math.Sqrt((3 * (triBase * _
    triBase) / 4)))

    ' Coordinates of first circle
    's bounding rectangle.
    Dim x1 As Single = 40
    Dim y1 As Single = 40

    ' Fill 3 over-lapping circles. Each circle is a different color.
    g.FillEllipse(trnsRedBrush, x1, y1, 2 * triHeight, 2 * triHeight)
    g.FillEllipse(trnsGreenBrush, x1 + triBase / 2, y1 + triHeight, _
    2 * triHeight, 2 * triHeight)
    g.FillEllipse(trnsBlueBrush, x1 + triBase, y1, 2 * triHeight, _
    2 * triHeight)
End Sub

備註

32 位 ARGB 值的位元組順序是 AARRGGBB。以 AA 表示的最顯著位元組（MSB）是 Alpha 元件值。第二個、第三個和第四個字節分別以 RR、GG 和 BB 表示，分別是紅色、綠色和藍色的色彩元件。

適用於

共用方式為

Color.FromArgb 方法

定義

多載

FromArgb(Int32, Int32, Int32, Int32)

參數

傳回

例外狀況

範例

備註

適用於

FromArgb(Int32, Int32, Int32)

參數

傳回

例外狀況

範例

適用於

FromArgb(Int32, Color)

參數

傳回

例外狀況

範例

備註

適用於

FromArgb(Int32)

參數

傳回

範例

備註

適用於

其他資源