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Ch2Weather first version

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This commit is contained in:
Federico Pasqua
2025-11-02 14:43:21 +01:00
parent e5a041da0d
commit 3c2948a5d1
5 changed files with 160 additions and 0 deletions
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11
Ch2Weather/Ch2Weather.csproj Normal file
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@@ -0,0 +1,11 @@
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net9.0</TargetFramework>
<LangVersion>latestmajor</LangVersion>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
</Project>

38
Ch2Weather/Exercise1.mermaid Normal file
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classDiagram
class WeatherData {
getTemperature()
getHumidity()
getPressure()
measurementsChanged()
subscribe(observer: IWeatherObserver)
unsubscribe(observer: IWeatherObserver)
notify(data: WeatherRecord)
}
class WeatherRecord {
f32 temperature
f32 humidity
f32 pressure
}
class IWeatherObserver {
update(data: WeatherRecord)
}
class IWeatherSubject {
subscribe(observer: IWeatherObserver)
unsubscribe(observer: IWeatherObserver)
notify(data: WeatherRecord)
}
class WeatherScreen1 {
update(data: WeatherRecord)
draw()
}
IWeatherSubject <|.. WeatherData
IWeatherObserver <|.. WeatherScreen1
IWeatherObserver <-- IWeatherSubject : observers
WeatherData <-- WeatherScreen1 : Subjects
IWeatherObserver .. IWeatherSubject
class IDisplayElement {
draw()
}
IDisplayElement <|.. WeatherScreen1

10
Ch2Weather/Program.cs Normal file
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@@ -0,0 +1,10 @@
// See https://aka.ms/new-console-template for more information
using Ch2Weather;
var weatherData = new WeatherData(new WeatherRecord(0, 0,0));
_ = new CurrentConditionsDisplay(weatherData);
_ = new HeatIndexDisplay(weatherData);
weatherData.WeatherRecord = new WeatherRecord(25, 50, 30);
weatherData.WeatherRecord = new WeatherRecord(35, 55, 29.8);
weatherData.WeatherRecord = new WeatherRecord(45, 60, 29.6);

95
Ch2Weather/Weather.cs Normal file
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namespace Ch2Weather;
public record struct WeatherRecord(double Temperature, double Humidity, double Pressure);
public interface IWeatherSubject {
void Subscribe(IWeatherObserver o);
void Unsubscribe(IWeatherObserver o);
void NotifyObservers();
}
public interface IWeatherObserver {
void Update(WeatherRecord wr);
}
public interface IWeatherDisplay {
void Display();
}
public class WeatherData(WeatherRecord weatherRecord) : IWeatherSubject {
private readonly List<IWeatherObserver> _observers = [];
private WeatherRecord _weatherRecord = weatherRecord;
public WeatherRecord WeatherRecord {
get => _weatherRecord;
set {
_weatherRecord = value;
NotifyObservers();
}
}
public void Subscribe(IWeatherObserver o) {
_observers.Add(o);
}
public void Unsubscribe(IWeatherObserver o) {
_observers.Remove(o);
}
public void NotifyObservers() {
foreach (var o in _observers) {
o.Update(_weatherRecord);
}
}
}
public class CurrentConditionsDisplay : IWeatherObserver, IWeatherDisplay {
private IWeatherSubject _subject;
private double _temperature = 0;
private double _humidity = 0;
public CurrentConditionsDisplay(IWeatherSubject subject) {
_subject = subject;
subject.Subscribe(this);
}
public void Update(WeatherRecord wr) {
_temperature = wr.Temperature;
_humidity = wr.Humidity;
Display();
}
public void Display() {
Console.WriteLine($"Current conditions: {_temperature}C degrees and {_humidity}% humidity.");
}
}
public class HeatIndexDisplay : IWeatherObserver, IWeatherDisplay {
private IWeatherSubject _subject;
private WeatherRecord _weatherRecord = new WeatherRecord(0,0,0);
public HeatIndexDisplay(IWeatherSubject subject) {
_subject = subject;
subject.Subscribe(this);
}
private double ComputeHeatIndex(double t, double rh) {
return (16.923 + (0.185212 * t) + (5.37941 * rh) - (0.100254 * t * rh) +
(0.00941695 * (t * t)) + (0.00728898 * (rh * rh)) +
(0.000345372 * (t * t * rh)) - (0.000814971 * (t * rh * rh)) +
(0.0000102102 * (t * t * rh * rh)) - (0.000038646 * (t * t * t)) + (0.0000291583 *
(rh * rh * rh)) + (0.00000142721 * (t * t * t * rh)) +
(0.000000197483 * (t * rh * rh * rh)) - (0.0000000218429 * (t * t * t * rh * rh)) +
0.000000000843296 * (t * t * rh * rh * rh)) -
(0.0000000000481975 * (t * t * t * rh * rh * rh));
}
public void Update(WeatherRecord wr) {
_weatherRecord = wr;
Display();
}
public void Display() {
var heatIndex = ComputeHeatIndex(_weatherRecord.Temperature, _weatherRecord.Humidity);
Console.WriteLine($"Heat Index is {heatIndex}");
}
}

6
HeadFirstDesignPatterns.sln
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@@ -2,6 +2,8 @@
Microsoft Visual Studio Solution File, Format Version 12.00
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ch1Duck", "Ch1Duck\Ch1Duck.csproj", "{941002B3-4C8C-4A9A-9071-7FD27E9E5C9F}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ch2Weather", "Ch2Weather\Ch2Weather.csproj", "{D457D364-C0AB-42D2-A0B7-245D038CE8D1}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
@@ -12,5 +14,9 @@ Global
{941002B3-4C8C-4A9A-9071-7FD27E9E5C9F}.Debug|Any CPU.Build.0 = Debug|Any CPU
{941002B3-4C8C-4A9A-9071-7FD27E9E5C9F}.Release|Any CPU.ActiveCfg = Release|Any CPU
{941002B3-4C8C-4A9A-9071-7FD27E9E5C9F}.Release|Any CPU.Build.0 = Release|Any CPU
{D457D364-C0AB-42D2-A0B7-245D038CE8D1}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{D457D364-C0AB-42D2-A0B7-245D038CE8D1}.Debug|Any CPU.Build.0 = Debug|Any CPU
{D457D364-C0AB-42D2-A0B7-245D038CE8D1}.Release|Any CPU.ActiveCfg = Release|Any CPU
{D457D364-C0AB-42D2-A0B7-245D038CE8D1}.Release|Any CPU.Build.0 = Release|Any CPU
EndGlobalSection
EndGlobal