withGreen method
Returns a new color that matches this color with the green channel
replaced with g
(which ranges from 0 to 255).
Out of range values will have unexpected effects.
Implementation
Color withGreen(int g) {
return Color.fromARGB((a * 255.0).round() & 0xff,
(r * 255.0).round() & 0xff, g, (b * 255.0).round() & 0xff);
}