Class: Google::Apis::VisionV1::Color

Inherits:
Object
  • Object
show all
Includes:
Core::Hashable, Core::JsonObjectSupport
Defined in:
generated/google/apis/vision_v1/classes.rb,
generated/google/apis/vision_v1/representations.rb,
generated/google/apis/vision_v1/representations.rb

Overview

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, as well. Here are some examples: 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(''); ; // ...

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Core::JsonObjectSupport

#to_json

Methods included from Core::Hashable

process_value, #to_h

Constructor Details

#initialize(**args) ⇒ Color


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# File 'generated/google/apis/vision_v1/classes.rb', line 949

def initialize(**args)
   update!(**args)
end

Instance Attribute Details

#alphaFloat

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 to be rendered as a solid color (as if the alpha value had been explicitly given with a value of 1.0). Corresponds to the JSON property alpha


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# File 'generated/google/apis/vision_v1/classes.rb', line 947

def alpha
  @alpha
end

#blueFloat

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


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# File 'generated/google/apis/vision_v1/classes.rb', line 929

def blue
  @blue
end

#greenFloat

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


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# File 'generated/google/apis/vision_v1/classes.rb', line 924

def green
  @green
end

#redFloat

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


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# File 'generated/google/apis/vision_v1/classes.rb', line 934

def red
  @red
end

Instance Method Details

#update!(**args) ⇒ Object

Update properties of this object


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# File 'generated/google/apis/vision_v1/classes.rb', line 954

def update!(**args)
  @green = args[:green] if args.key?(:green)
  @blue = args[:blue] if args.key?(:blue)
  @red = args[:red] if args.key?(:red)
  @alpha = args[:alpha] if args.key?(:alpha)
end