Class Color (2.15.0)

public sealed class Color : IMessage<Color>, IEquatable<Color>, IDeepCloneable<Color>, IBufferMessage, IMessage

Represents a color in the RGBA color space. This representation is designed for simplicity of conversion to/from color representations in various languages over compactness. For example, the fields of this representation can be trivially provided to the constructor of java.awt.Color in Java; it can also be trivially provided to UIColor's +colorWithRed:green:blue:alpha method in iOS; and, with just a little work, it can be easily formatted into a CSS rgba() string in JavaScript.

This reference page doesn't carry information about the absolute color space that should be used to interpret the RGB value (e.g. sRGB, Adobe RGB, DCI-P3, BT.2020, etc.). By default, applications should assume the sRGB color space.

When color equality needs to be decided, implementations, unless documented otherwise, treat two colors as equal if all their red, green, blue, and alpha values each differ by at most 1e-5.

Example (Java):

 import com.google.type.Color;

 // ...
 public static java.awt.Color fromProto(Color protocolor) {
   float alpha = protocolor.hasAlpha()
       ? protocolor.getAlpha().getValue()
       : 1.0;

   return new java.awt.Color(
       protocolor.getRed(),
       protocolor.getGreen(),
       protocolor.getBlue(),
       alpha);
 }

 public static Color toProto(java.awt.Color color) {
   float red = (float) color.getRed();
   float green = (float) color.getGreen();
   float blue = (float) color.getBlue();
   float denominator = 255.0;
   Color.Builder resultBuilder =
       Color
           .newBuilder()
           .setRed(red / denominator)
           .setGreen(green / denominator)
           .setBlue(blue / denominator);
   int alpha = color.getAlpha();
   if (alpha != 255) {
     result.setAlpha(
         FloatValue
             .newBuilder()
             .setValue(((float) alpha) / denominator)
             .build());
   }
   return resultBuilder.build();
 }
 // ...

Example (iOS / Obj-C):

 // ...
 static UIColor* fromProto(Color* protocolor) {
    float red = [protocolor red];
    float green = [protocolor green];
    float blue = [protocolor blue];
    FloatValue* alpha_wrapper = [protocolor alpha];
    float alpha = 1.0;
    if (alpha_wrapper != nil) {
      alpha = [alpha_wrapper value];
    }
    return [UIColor colorWithRed:red green:green blue:blue alpha:alpha];
 }

 static Color* toProto(UIColor* color) {
     CGFloat red, green, blue, alpha;
     if (![color getRed:&red green:&green blue:&blue alpha:&alpha]) {
       return nil;
     }
     Color* result = [[Color alloc] init];
     [result setRed:red];
     [result setGreen:green];
     [result setBlue:blue];
     if (alpha <= 0.9999) {
       [result setAlpha:floatWrapperWithValue(alpha)];
     }
     [result autorelease];
     return result;
}
// ...

Example (JavaScript):

// ...

var protoToCssColor = function(rgb_color) {
   var redFrac = rgb_color.red || 0.0;
   var greenFrac = rgb_color.green || 0.0;
   var blueFrac = rgb_color.blue || 0.0;
   var red = Math.floor(redFrac * 255);
   var green = Math.floor(greenFrac * 255);
   var blue = Math.floor(blueFrac * 255);

   if (!('alpha' in rgb_color)) {
      return rgbToCssColor(red, green, blue);
   }

   var alphaFrac = rgb_color.alpha.value || 0.0;
   var rgbParams = [red, green, blue].join(',');
   return ['rgba(', rgbParams, ',', alphaFrac, ')'].join('');
};

var rgbToCssColor = function(red, green, blue) {
  var rgbNumber = new Number((red << 16) | (green << 8) | blue);
  var hexString = rgbNumber.toString(16);
  var missingZeros = 6 - hexString.length;
  var resultBuilder = ['#'];
  for (var i = 0; i < missingZeros; i++) {
     resultBuilder.push('0');
  }
  resultBuilder.push(hexString);
  return resultBuilder.join('');
};

// ...

Inheritance

object > Color

Implements

IMessage Color, IEquatable Color, IDeepCloneable Color, IBufferMessage, IMessage

Inherited Members

object.Equals(object, object)

object.GetType()

object.ReferenceEquals(object, object)

Namespace

Google.Type

Assembly

Google.Api.CommonProtos.dll

Constructors

Color()

public Color()

Color(Color)

public Color(Color other)

Parameter
Name	Description
`other`	`Color`

Fields

AlphaFieldNumber

public const int AlphaFieldNumber = 4

Field number for the "alpha" field.

Field Value
Type	Description
`int`

BlueFieldNumber

public const int BlueFieldNumber = 3

Field number for the "blue" field.

Field Value
Type	Description
`int`

GreenFieldNumber

public const int GreenFieldNumber = 2

Field number for the "green" field.

Field Value
Type	Description
`int`

RedFieldNumber

public const int RedFieldNumber = 1

Field number for the "red" field.

Field Value
Type	Description
`int`

Properties

Alpha

public float? Alpha { get; set; }

The fraction of this color that should be applied to the pixel. That is, the final pixel color is defined by the equation:

pixel color = alpha * (this color) + (1.0 - alpha) * (background color)

This means that a value of 1.0 corresponds to a solid color, whereas a value of 0.0 corresponds to a completely transparent color. This uses a wrapper message rather than a simple float scalar so that it is possible to distinguish between a default value and the value being unset. If omitted, this color object is rendered as a solid color (as if the alpha value had been explicitly given a value of 1.0).

Property Value
Type	Description
`float`

Blue

public float Blue { get; set; }

The amount of blue in the color as a value in the interval [0, 1].

Property Value
Type	Description
`float`

Descriptor

public static MessageDescriptor Descriptor { get; }

Property Value
Type	Description
`MessageDescriptor`

Green

public float Green { get; set; }

The amount of green in the color as a value in the interval [0, 1].

Property Value
Type	Description
`float`

Parser

public static MessageParser<Color> Parser { get; }

Property Value
Type	Description
`MessageParserColor`

Red

public float Red { get; set; }

The amount of red in the color as a value in the interval [0, 1].

Property Value
Type	Description
`float`

Methods

CalculateSize()

public int CalculateSize()

Calculates the size of this message in Protocol Buffer wire format, in bytes.

Returns
Type	Description
`int`	The number of bytes required to write this message to a coded output stream.

Clone()

public Color Clone()

Creates a deep clone of this object.

Returns
Type	Description
`Color`	A deep clone of this object.

Equals(Color)

public bool Equals(Color other)

Parameter
Name	Description
`other`	`Color`

Returns
Type	Description
`bool`

Equals(object)

public override bool Equals(object other)

Parameter
Name	Description
`other`	`object`

Returns
Type	Description
`bool`

Overrides

object.Equals(object)

GetHashCode()

public override int GetHashCode()

Returns
Type	Description
`int`

Overrides

object.GetHashCode()

MergeFrom(CodedInputStream)

public void MergeFrom(CodedInputStream input)

Merges the data from the specified coded input stream with the current message.

Parameter
Name	Description
`input`	`CodedInputStream`

Remarks

See the user guide for precise merge semantics.

MergeFrom(Color)

public void MergeFrom(Color other)

Merges the given message into this one.

Parameter
Name	Description
`other`	`Color`

Remarks

See the user guide for precise merge semantics.

ToString()

public override string ToString()

Returns
Type	Description
`string`

Overrides

object.ToString()

WriteTo(CodedOutputStream)

public void WriteTo(CodedOutputStream output)

Writes the data to the given coded output stream.

Parameter
Name	Description
`output`	`CodedOutputStream` Coded output stream to write the data to. Must not be null.