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Added constructor for hex color strings

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This commit is contained in:
Bob Polis 2022-09-23 16:48:33 +02:00
parent e037e8e5b6
commit 965117d291
2 changed files with 26 additions and 16 deletions
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31
src/Color.cpp
View File

@ -1,14 +1,9 @@
//
// Color.cpp
// screensaver
//
// Created by Bob Polis at 2020-10-27
// Copyright (c) 2020 SwiftCoder. All rights reserved.
//
#include "Color.hpp"
#include <algorithm>
#include <cmath>
#include <stdexcept>
#include <sstream>
#include <iomanip>
Color::Color(const RGB& rgb) : _rgb {rgb} {}
@ -81,3 +76,23 @@ Color::operator HSB() const {
hsb.b = rgb_max;
return hsb;
}
Color::Color(const std::string& hex) {
if (hex[0] != '#') throw std::runtime_error {"invalid hex color - must start with '#'"};
if (hex.size() != 7) throw std::runtime_error {"invalid hex color - must be 7 chars"};
unsigned int val;
std::istringstream iss {hex.substr(1, 2)};
iss >> std::hex >> val;
_rgb.r = val / 256.0;
iss.str(hex.substr(3, 2));
iss.seekg(0);
iss >> std::hex >> val;
_rgb.g = val / 256.0;
iss.str(hex.substr(5, 2));
iss.seekg(0);
iss >> std::hex >> val;
_rgb.b = val / 256.0;
}

11
src/Color.hpp
View File

@ -1,14 +1,8 @@
//
// Color.hpp
// screensaver
//
// Created by Bob Polis at 2020-10-27
// Copyright (c) 2020 SwiftCoder. All rights reserved.
//
#ifndef _Color_H_
#define _Color_H_
#include <string>
struct RGB {
double r;
double g;
@ -25,6 +19,7 @@ class Color {
public:
Color(const RGB& rgb);
Color(const HSB& hsb);
Color(const std::string& hex);
operator RGB() const { return _rgb; }
operator HSB() const;