41 lines
999 B
D
41 lines
999 B
D
module observer.request.forecastdisplay;
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import observer.request.displayelement;
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import observer.request.observer;
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import observer.request.weatherdata;
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import std.stdio : write, writeln;
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import std.format : format;
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class ForecastDisplay : Observer, DisplayElement
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{
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private:
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float currentPressure = 29.92f;
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float lastPressure;
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WeatherData weatherData;
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public:
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this(WeatherData weatherData)
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{
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this.weatherData = weatherData;
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weatherData.registerObserver(this);
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}
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override void update()
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{
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lastPressure = currentPressure;
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currentPressure = weatherData.getPressure;
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display();
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}
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override void display()
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{
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write("Forecast: ");
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if (currentPressure > lastPressure) {
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writeln("Improving weather on the way!");
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} else if (currentPressure == lastPressure) {
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writeln("More of the same");
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} else if (currentPressure < lastPressure) {
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writeln("Watch out for cooler, rainy weather");
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}
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}
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}
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