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