38 lines
1.2 KiB
D
38 lines
1.2 KiB
D
module observer.heatindexdisplay;
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import observer.displayelement;
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import observer.observer;
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import observer.weatherdata;
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import std.stdio : writeln;
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class HeatIndexDisplay : Observer, DisplayElement
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{
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private:
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float heatIndex;
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WeatherData weatherData;
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float computeHeatIndex(float t, float rh)
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{
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return ((16.923 + (0.185212 * t) + (5.37941 * rh) - (0.100254 * t * rh) + (0.00941695 * (t * t))
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+ (0.00728898 * (rh * rh)) + (0.000345372 * (t * t * rh)) - (0.000814971 * (t * rh * rh))
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+ (0.0000102102 * (t * t * rh * rh)) - (0.000038646 * (t * t * t)) + (0.0000291583 * (rh * rh * rh))
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+ (0.00000142721 * (t * t * t * rh)) + (0.000000197483 * (t * rh * rh * rh))
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- (0.0000000218429 * (t * t * t * rh * rh)) + 0.000000000843296 * (t * t * rh * rh * rh))
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- (0.0000000000481975 * (t * t * t * rh * rh * rh)));
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}
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public:
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this(WeatherData weatherData)
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{
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weatherData.registerObserver(this);
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}
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override void update(float temperature, float humidity, float pressure)
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{
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this.heatIndex = computeHeatIndex(temperature, humidity);
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display();
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}
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override void display()
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{
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writeln("Heat index is ", heatIndex);
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}
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} |