48 lines
1.2 KiB
C++
48 lines
1.2 KiB
C++
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/*
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* ForecastDisplay.hpp
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*
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* Created on: 31 окт. 2021 г.
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* Author: alexander
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*/
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#pragma once
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#include "Observer.hpp"
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#include "DisplayElement.hpp"
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#include "WeatherData.hpp"
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class ForecastDisplay: public Observer, public DisplayElement
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{
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private:
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float currentPressure;
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float lastPressure;
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WeatherData &weatherData;
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public:
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ForecastDisplay(WeatherData &weatherData) :
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currentPressure(29.92), lastPressure(0.0), weatherData(weatherData)
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{
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weatherData.registerObserver(*this);
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}
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void update(float temperature, float humidity, float pressure) override
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{
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this->lastPressure = this->currentPressure;
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this->currentPressure = pressure;
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display();
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}
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void display() const override
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{
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std::cout << "Forecast: ";
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if (currentPressure > lastPressure) {
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std::cout << "Improving weather on the way!";
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} else if (currentPressure == lastPressure) {
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std::cout << "More of the same";
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} else if (currentPressure < lastPressure) {
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std::cout << "Watch out for cooler, rainy weather";
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}
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std::cout << std::endl;
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}
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};
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