Color.FromArgb 方法

参考

定义

命名空间:: System.Drawing

程序集:: System.Drawing.Primitives.dll

程序集:: System.Drawing.dll

程序集:: netstandard.dll

重要

一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。

基于四个 8 位 ARGB 组件（alpha、红色、绿色和蓝色）值创建 Color 结构。

重载

FromArgb(Int32, Int32, Int32, Int32)	基于四个 ARGB 组件（alpha、红色、绿色和蓝色）值创建 Color 结构。尽管此方法允许为每个组件传递 32 位值，但每个组件的值仅限于 8 位。
FromArgb(Int32, Int32, Int32)	基于指定的 8 位颜色值（红色、绿色和蓝色）创建 Color 结构。隐式的 alpha 值为 255（完全不透明）。尽管此方法允许为每个颜色组件传递 32 位值，但每个组件的值仅限于 8 位。
FromArgb(Int32, Color)	从指定的 Color 结构创建 Color 结构，但要使用新指定的 alpha 值。尽管此方法允许为 alpha 值传递 32 位值，但该值仅限于 8 位。
FromArgb(Int32)	基于一个 32 位 ARGB 值创建 Color 结构。

FromArgb(Int32, Int32, Int32, Int32)

Source:: Color.cs

Source:: Color.cs

Source:: Color.cs

基于四个 ARGB 组件（alpha、红色、绿色和蓝色）值创建 Color 结构。尽管此方法允许为每个组件传递 32 位值，但每个组件的值仅限于 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

参数

alpha: Int32

Alpha 组件。有效值为 0 到 255。

red: Int32

红色组件。有效值为 0 到 255。

green: Int32

绿色组件。有效值为 0 到 255。

blue: Int32

蓝色组件。有效值为 0 到 255。

Color

此方法创建的 Color。

例外

ArgumentException

alpha、red、green 或 blue 小于 0 或大于 255。

示例

下面的代码示例旨在与 Windows 窗体一起使用，它需要 PaintEventArgse，这是事件处理程序的参数Paint。此代码执行以下操作：

创建三个画笔，每个画笔具有不同的颜色。用于创建画笔的每个 Color 结构都是根据 alpha、红色、绿色、蓝色) (四个分量值创建的。
使用虚三角形定位三个圆。
绘制三个重叠的圆，每个圆都以三角形的一个顶点为中心，为每个圆使用不同的画笔。

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

注解

若要创建不透明颜色，请将设置为 alpha 255。若要创建半透明颜色，请将设置为 alpha 1 到 254 的任何值。

适用于

FromArgb(Int32, Int32, Int32)

Source:: Color.cs

Source:: Color.cs

Source:: Color.cs

基于指定的 8 位颜色值（红色、绿色和蓝色）创建 Color 结构。隐式的 alpha 值为 255（完全不透明）。尽管此方法允许为每个颜色组件传递 32 位值，但每个组件的值仅限于 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

参数

red: Int32

新 Color 的红色组件值。有效值为 0 到 255。

green: Int32

新 Color 的绿色组件值。有效值为 0 到 255。

blue: Int32

新 Color 的蓝色组件值。有效值为 0 到 255。

Color

此方法创建的 Color。

例外

ArgumentException

red、green 或 blue 小于 0 或大于 255。

示例

下面的代码示例旨在与 Windows 窗体一起使用，它需要 PaintEventArgse，这是事件处理程序的参数Paint。此代码执行以下操作：

Color根据红色、绿色、蓝色) (三个颜色分量值创建结构。创建三 Color 个结构，每个主要颜色各一个。
循环访问一系列 alpha 值，更改颜色的 alpha 值。
在每次迭代期间，将画笔的颜色设置为修改后的颜色，并绘制一个矩形以显示该颜色。
对每种主要颜色重复步骤 2 和 3。

alpha 值永远不会完全不透明，并且矩形重叠，因此可获得颜色组合效果。

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

适用于

FromArgb(Int32, Color)

Source:: Color.cs

Source:: Color.cs

Source:: Color.cs

从指定的 Color 结构创建 Color 结构，但要使用新指定的 alpha 值。尽管此方法允许为 alpha 值传递 32 位值，但该值仅限于 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

参数

alpha: Int32

新 Color 的 alpha 值。有效值为 0 到 255。

baseColor: Color

从中创建新 Color 的 Color。

Color

此方法创建的 Color。

例外

ArgumentException

alpha 小于 0 或大于 255。

示例

下面的代码示例旨在与 Windows 窗体一起使用，它需要 PaintEventArgse，这是事件处理程序的参数Paint。此代码执行以下操作：

Color根据红色、绿色、蓝色) (三个颜色分量值创建结构。创建三 Color 个结构，每个主要颜色各一个。
循环访问一系列 alpha 值，更改颜色的 alpha 值。
在每次迭代期间，将画笔的颜色设置为修改后的颜色，并绘制一个矩形以显示该颜色。
对每种主要颜色重复步骤 2 和 3。

alpha 值永远不会完全不透明，并且矩形重叠，因此可获得颜色组合效果。

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

注解

若要创建不透明颜色，请将设置为 alpha 255。若要创建半透明颜色，请将设置为 alpha 1 到 254 的任何值。

适用于

FromArgb(Int32)

Source:: Color.cs

Source:: Color.cs

Source:: Color.cs

基于一个 32 位 ARGB 值创建 Color 结构。

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

参数

argb: Int32

用于指定 32 位 ARGB 值的值。

Color

此方法创建的 Color 结构。

示例

下面的代码示例旨在与 Windows 窗体一起使用，它需要 PaintEventArgse，这是事件处理程序的参数Paint。此代码执行以下操作：

创建三个画笔，每个画笔具有不同的颜色。用于创建画笔的每个 Color 结构都是从 32 位 ARGB 值创建的。
使用虚三角形定位三个圆。
绘制三个重叠的圆，每个圆都以三角形的一个顶点为中心，为每个圆使用不同的画笔。

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

注解

32 位 ARGB 值的字节顺序为 AARRGGBB。由 AA 表示的最有效字节 (MSB) 是 alpha 分量值。分别由 RR、GG 和 BB 表示的第二个、第三个和第四个字节是红色、绿色和蓝色的颜色分量。

适用于

Color.FromArgb 方法

定义

重载

FromArgb(Int32, Int32, Int32, Int32)

参数

返回

例外

示例

注解

适用于

FromArgb(Int32, Int32, Int32)

参数

返回

例外

示例

适用于

FromArgb(Int32, Color)

参数

返回

例外

示例

注解

适用于

FromArgb(Int32)

参数

返回

示例

注解

适用于

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