Initial commit

5 files changed, 112 insertions, 0 deletions

diff --git a/MindBox.Lib/Circle.cs b/MindBox.Lib/Circle.cs
new file mode 100644
index 0000000..5793a26
--- /dev/null
+++ b/MindBox.Lib/Circle.cs
@@ -0,0 +1,37 @@
+namespace MindBox.Lib;
+
+public class Circle : FlatShape
+{
+	private readonly double _radius;
+	
+	public required double Radius 
+	{
+		get
+		{
+			return _radius;
+		}
+		init
+		{
+			if (value <= 0.0)
+			{
+				throw new ArgumentException($"Radius cannot be non-positive: {value}");
+			}
+			else
+			{
+				_radius = value;
+			}
+		}
+	}
+	public override double GetArea()
+	{
+		if (_area != null)
+		{
+			return _area.Value;
+		}
+		else
+		{
+			_area = Math.PI * _radius * _radius;
+			return _area.Value;
+		}
+	}
+}
\ No newline at end of file
diff --git a/MindBox.Lib/FlatShape.cs b/MindBox.Lib/FlatShape.cs
new file mode 100644
index 0000000..aa43312
--- /dev/null
+++ b/MindBox.Lib/FlatShape.cs
@@ -0,0 +1,10 @@
+namespace MindBox.Lib;
+
+public abstract class FlatShape : ITwoDimensional
+{
+	protected double? _area;
+	public virtual double GetArea()
+	{
+		throw new NotImplementedException();
+	}
+}
diff --git a/MindBox.Lib/ITwoDimensional.cs b/MindBox.Lib/ITwoDimensional.cs
new file mode 100644
index 0000000..776e74f
--- /dev/null
+++ b/MindBox.Lib/ITwoDimensional.cs
@@ -0,0 +1,6 @@
+namespace MindBox.Lib;
+
+public interface ITwoDimensional
+{
+	public double GetArea();
+}
diff --git a/MindBox.Lib/MindBox.Lib.csproj b/MindBox.Lib/MindBox.Lib.csproj
new file mode 100644
index 0000000..c513307
--- /dev/null
+++ b/MindBox.Lib/MindBox.Lib.csproj
@@ -0,0 +1,15 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <Version>0.0.1</Version>
+    <Authors>Serghei Cebotari</Authors>
+    <Product>MindBox Shape Library</Product>    
+    <Description>
+      Тестовое задание MindBox. Геометрическая библиотка для вычисления площади фигур.
+    </Description>
+  </PropertyGroup>
+
+</Project>
diff --git a/MindBox.Lib/Triangle.cs b/MindBox.Lib/Triangle.cs
new file mode 100644
index 0000000..54e8a85
--- /dev/null
+++ b/MindBox.Lib/Triangle.cs
@@ -0,0 +1,44 @@
+namespace MindBox.Lib;
+
+public class Triangle : FlatShape
+{
+	private readonly double[] _sides;
+
+	public Triangle(double a, double b, double c)
+	{
+		_sides = new[] { a, b, c };
+		if (_sides.Any(side => side <= 0))
+		{
+			throw new ArgumentException($"Side(s) cannot be non-positive: {string.Join(" ;", _sides.Where(side => side <= 0))}");
+		}
+		if (a >= b + c || b >= c + a || c >= a + b)
+		{
+			throw new ArgumentException($"Sides lengths are not valid: {a}, {b}, {c}");
+		}
+	}
+	public override double GetArea()
+	{
+		if (_area != null)
+		{
+			return _area.Value;
+		}
+		else
+		{
+			double semiPerimeter = _sides.Sum() / 2;
+			_area = Math.Sqrt(semiPerimeter *
+				(semiPerimeter - _sides[0]) *
+				(semiPerimeter - _sides[1]) *
+				(semiPerimeter - _sides[2]));
+			return _area.Value;
+		}
+	}
+	public bool IsRight()
+	{
+		var sorted = _sides.OrderByDescending(x => x);
+
+		double hypotenuse = sorted.First();
+		var catheti = sorted.Skip(1);
+
+		return hypotenuse * hypotenuse == catheti.Sum(x => x * x);
+	}
+}