operator * method
Implementation
Color operator *(dynamic v) {
if (v is num) {
return Color(r: r * v, g: g * v, b: b * v);
} else if (v is Color) {
return Color(r: r * v.r, g: g * v.g, b: b * v.b);
} else {
throw 'Color only support multiplication by double or Color';
}
}