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patterns/observer/delivery/statiscticdisplay.d

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D

module observer.delivery.statiscticdisplay;
import observer.delivery.displayelement;
import observer.delivery.observer;
import observer.delivery.weatherdata;
import std.stdio : writeln;
import std.format : format;
class StatisticsDisplay : Observer, DisplayElement
{
private:
float maxTemp = 0.0f;
float minTemp = 200;
float tempSum= 0.0f;
int numReadings;
public:
this(WeatherData weatherData)
{
weatherData.registerObserver(this);
}
override void update(float temperature, float humidity, float pressure)
{
tempSum += temperature;
numReadings++;
if (temperature > maxTemp)
{
maxTemp = temperature;
}
if (temperature < minTemp)
{
minTemp = temperature;
}
display();
}
override void display()
{
writeln("Avg/Max/Min temperature = ", (tempSum / numReadings), '/', maxTemp, '/', minTemp);
// writeln("Avg/Max/Min temperature = ".format(temperature), "F degrees and %3.1f%% humidity".format(humidity));
}
}