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A GdkRGBA is used to represent a color, in a way that is compatible with cairo’s notion of color.

GdkRGBA is a convenient way to pass colors around. It’s based on cairo’s way to deal with colors and mirrors its behavior. All values are in the range from 0.0 to 1.0 inclusive. So the color (0.0, 0.0, 0.0, 0.0) represents transparent black and (1.0, 1.0, 1.0, 1.0) is opaque white. Other values will be clamped to this range when drawing.

record

Hierarchy

  • RGBA

Index

Constructors

Properties

alpha: number

The opacity of the color from 0.0 for completely translucent to 1.0 for opaque

field
blue: number

The intensity of the blue channel from 0.0 to 1.0 inclusive

field
green: number

The intensity of the green channel from 0.0 to 1.0 inclusive

field
red: number

The intensity of the red channel from 0.0 to 1.0 inclusive

field
name: string

Methods

  • Makes a copy of a GdkRGBA.

    The result must be freed through [methodGdk.RGBA.free].

    Returns Gdk.RGBA

  • free(): void
  • hash(): number
  • A hash function suitable for using for a hash table that stores GdkRGBAs.

    Returns number

  • isClear(): boolean
  • Checks if an rgba value is transparent.

    That is, drawing with the value would not produce any change.

    Returns boolean

  • isOpaque(): boolean
  • Checks if an rgba value is opaque.

    That is, drawing with the value will not retain any results from previous contents.

    Returns boolean

  • parse(spec: string): boolean
  • Parses a textual representation of a color.

    The string can be either one of:

    • A standard name (Taken from the Css specification).
    • A hexadecimal value in the form “#rgb”, “#rrggbb”, “#rrrgggbbb” or ”#rrrrggggbbbb”
    • A hexadecimal value in the form “#rgba”, “#rrggbbaa”, or ”#rrrrggggbbbbaaaa”
    • A RGB color in the form “rgb(r,g,b)” (In this case the color will have full opacity)
    • A RGBA color in the form “rgba(r,g,b,a)”

    Where “r”, “g”, “b” and “a” are respectively the red, green, blue and alpha color values. In the last two cases, “r”, “g”, and “b” are either integers in the range 0 to 255 or percentage values in the range 0% to 100%, and a is a floating point value in the range 0 to 1.

    Parameters

    • spec: string

      the string specifying the color

    Returns boolean

  • toString(): string
  • Returns a textual specification of rgba in the form rgb(r,g,b) or rgba(r,g,b,a), where “r”, “g”, “b” and “a” represent the red, green, blue and alpha values respectively. “r”, “g”, and “b” are represented as integers in the range 0 to 255, and “a” is represented as a floating point value in the range 0 to 1.

    These string forms are string forms that are supported by the CSS3 colors module, and can be parsed by [methodGdk.RGBA.parse].

    Note that this string representation may lose some precision, since “r”, “g” and “b” are represented as 8-bit integers. If this is a concern, you should use a different representation.

    Returns string

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