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Color.GetHue Method

Gets the hue-saturation-brightness (HSB) hue value, in degrees, for this Color structure.

Namespace:  System.Drawing
Assembly:  System.Drawing (in System.Drawing.dll)

public float GetHue()

Return Value

Type: System.Single
The hue, in degrees, of this Color. The hue is measured in degrees, ranging from 0.0 through 360.0, in HSB color space.

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code performs the following actions:

  • Creates an instance of a Color structure, redShade, to be used for comparisons.

  • Iterates through the KnownColor enumeration elements to find all known colors that have the same hue as redShade. The iterations are terminated when 15 matches are found or the value of the loop counter is greater than the last KnownColor element.

  • During each iteration, saves the KnownColor element—if it matches the criteria—in an array.

  • Uses a brush to paint rectangles.

The first rectangle is painted the color represented by redShade. Each of the other rectangles is painted a KnownColor that matches the hue of the redShade.

public void GetHueExample(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 hue 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.GetHue() == redShade.GetHue())
            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);
    }
}

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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