Color.fromRGBO constructor

const Color.fromRGBO(
  1. int r,
  2. int g,
  3. int b,
  4. double opacity,
)

Create an sRGB color from red, green, blue, and opacity, similar to rgba() in CSS.

  • r is red, from 0 to 255.
  • g is green, from 0 to 255.
  • b is blue, from 0 to 255.
  • opacity is alpha channel of this color as a double, with 0.0 being transparent and 1.0 being fully opaque.

Out of range values are brought into range using modulo 255.

See also fromARGB, which takes the opacity as an integer value.

Note

Each color is stored as floating-point color components, where the final value of each component is approximated by storing c / 255, where c is one of the four components (alpha, red, green, blue).

Implementation

const Color.fromRGBO(int r, int g, int b, double opacity)
  : this._fromRGBOC(r, g, b, opacity, ColorSpace.sRGB);