Class Color (2.10.0)

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

Namespace

Google.Type

Assembly

Google.Api.CommonProtos.dll

Constructors

Color()

public Color()

Color(Color)

public Color(Color other)
Parameter
NameDescription
otherColor

Fields

AlphaFieldNumber

public const int AlphaFieldNumber = 4

Field number for the "alpha" field.

Field Value
TypeDescription
int

BlueFieldNumber

public const int BlueFieldNumber = 3

Field number for the "blue" field.

Field Value
TypeDescription
int

GreenFieldNumber

public const int GreenFieldNumber = 2

Field number for the "green" field.

Field Value
TypeDescription
int

RedFieldNumber

public const int RedFieldNumber = 1

Field number for the "red" field.

Field Value
TypeDescription
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
TypeDescription
float

Blue

public float Blue { get; set; }

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

Property Value
TypeDescription
float

Descriptor

public static MessageDescriptor Descriptor { get; }
Property Value
TypeDescription
MessageDescriptor

Green

public float Green { get; set; }

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

Property Value
TypeDescription
float

Parser

public static MessageParser<Color> Parser { get; }
Property Value
TypeDescription
MessageParserColor

Red

public float Red { get; set; }

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

Property Value
TypeDescription
float

Methods

CalculateSize()

public int CalculateSize()
Returns
TypeDescription
int

Clone()

public Color Clone()
Returns
TypeDescription
Color

Equals(Color)

public bool Equals(Color other)
Parameter
NameDescription
otherColor
Returns
TypeDescription
bool

Equals(object)

public override bool Equals(object other)
Parameter
NameDescription
otherobject
Returns
TypeDescription
bool
Overrides

GetHashCode()

public override int GetHashCode()
Returns
TypeDescription
int
Overrides

MergeFrom(CodedInputStream)

public void MergeFrom(CodedInputStream input)
Parameter
NameDescription
inputCodedInputStream

MergeFrom(Color)

public void MergeFrom(Color other)
Parameter
NameDescription
otherColor

ToString()

public override string ToString()
Returns
TypeDescription
string
Overrides

WriteTo(CodedOutputStream)

public void WriteTo(CodedOutputStream output)
Parameter
NameDescription
outputCodedOutputStream