Леонид Рыбин

cs/TagsCloudVisualization/Extensions/ICircularCloudLayouterExtensions.cs

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+using System.Drawing;
+using TagsCloudVisualization.Layouters;
+
+namespace TagsCloudVisualization.Extensions;
+
+public static class ICircularCloudLayouterExtensions
+{
+    private const int MinRectangleSize = 40;
+    private const int MaxRectangleSize = 70;
+
+    public static Rectangle[] GenerateCloud(this ICloudLayouter layouter, int rectanglesNumber = 1000, int minRectangleSize = MinRectangleSize, int maxRectangleSize = MaxRectangleSize)
+    {
+        var random = new Random();
+        return Enumerable.Range(1, rectanglesNumber)
+                .Select(_ => new Size(
+                    random.Next(minRectangleSize, maxRectangleSize),
+                    random.Next(minRectangleSize, maxRectangleSize)))
+            .Select(size => layouter.PutNextRectangle(size))
+            .ToArray();
+    }
+}

cs/TagsCloudVisualization/Layouters/CircularCloudLayouter.cs

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+using System.Drawing;
+using TagsCloudVisualization.PointGenerators;
+
+namespace TagsCloudVisualization.Layouters;
+
+public class CircularCloudLayouter : ICloudLayouter
+{
+    private const double DefaultRadius = 1;
+    private const double DefaultAngleOffset = 10;
+    private readonly Point center;
+    public readonly List<Rectangle> rectangles;
+    private readonly CircularSpiralPointGenerator pointsGenerator;
+
+    public CircularCloudLayouter(Point center) : this(center, DefaultRadius, DefaultAngleOffset) {}
+
+    public CircularCloudLayouter(Point center, double radius, double angleOffset)
+    {
+        if (center.X < 0 || center.Y < 0)
+            throw new ArgumentException("X or Y must be positive");
+
+        this.center = center;
+        rectangles = new List<Rectangle>();
+
+        pointsGenerator = new CircularSpiralPointGenerator(radius, angleOffset, center);
+    }
+
+    public Rectangle PutNextRectangle(Size rectangleSize)
+    {
+        if (rectangleSize.Height <= 0 || rectangleSize.Width <= 0)
+            throw new ArgumentException("Height or Width is negative!");
+
+        Rectangle rectangle;
+
+        do
+        {
+            var rectangleCenterPos = pointsGenerator.GetPoint();
+            rectangle = CreateRectangle(rectangleCenterPos, rectangleSize);
+        } 
+        while (rectangles.Any(rectangle.IntersectsWith));
+
+        rectangles.Add(rectangle);
+
+        return rectangle;
+    }
+
+    private static Rectangle CreateRectangle(Point center, Size rectangleSize)
+    {
+        var x = center.X - rectangleSize.Width / 2;
+        var y = center.Y - rectangleSize.Height / 2;
+        return new Rectangle(x, y, rectangleSize.Width, rectangleSize.Height);
+    }
+}

cs/TagsCloudVisualization/Layouters/ICloudLayouter.cs

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+using System.Drawing;
+
+namespace TagsCloudVisualization.Layouters;
+
+public interface ICloudLayouter
+{
+    public Rectangle PutNextRectangle(Size rectangleSize);
+}

cs/TagsCloudVisualization/PointGenerators/CircularSpiralPointGenerator.cs

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+using System.Drawing;
+
+namespace TagsCloudVisualization.PointGenerators;
+
+public class CircularSpiralPointGenerator : IPointGenerator
+{
+    private double angleOffset;
+    private double radius;
+    private double angle = 0;
+    private Point center;
+
+    public CircularSpiralPointGenerator(double radius, double angleOffset, Point center)
+    {
+        if (radius <= 0)
+            throw new ArgumentException("radius must be greater than 0");
+        if (angleOffset <= 0)
+            throw new ArgumentException("angleOffset must be greater than 0");
+
+        this.radius = radius;
+        this.angleOffset = angleOffset * Math.PI / 180;
+        this.center = center;
+    }
+
+    public Point GetPoint()
+    {
+        var radiusVector = (radius / (2 * Math.PI)) * angle;
+
+        var x = (int)Math.Round(
+            radiusVector * Math.Cos(angle) + center.X);
+        var y = (int)Math.Round(
+            radiusVector * Math.Sin(angle) + center.Y);
+
+        angle += angleOffset;
+
+        return new Point(x, y);
+    }
+}

cs/TagsCloudVisualization/PointGenerators/IPointGenerator.cs

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+using System.Drawing;
+
+namespace TagsCloudVisualization.PointGenerators;
+
+public interface IPointGenerator
+{
+    public Point GetPoint();
+}

cs/TagsCloudVisualization/Program.cs

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+using System.Drawing;
+using System.Drawing.Imaging;
+using TagsCloudVisualization.Extensions;
+using TagsCloudVisualization.Layouters;
+using TagsCloudVisualization.Visualizers;
+
+namespace TagsCloudVisualization;
+
+internal class Program
+{
+    private const int ImageWidth = 1920;
+    private const int ImageHeight = 1080;
+
+    private const int RectanglesNumber = 100;
+
+    private const string ImagesDirectory = "images";
+
+    public static void Main(string[] args)
+    {
+        var center = new Point(ImageWidth / 2, ImageHeight / 2);
+        var cloudLayouter = new CircularCloudLayouter(center);
+
+        var rectangles = cloudLayouter.GenerateCloud(RectanglesNumber);
+
+        var visualizer = new Visualizer();
+        var bitmap = visualizer.CreateBitmap(rectangles, new Size(ImageWidth, ImageHeight));
+        Directory.CreateDirectory(ImagesDirectory);
+
+        bitmap.Save(GetPathToImages(), ImageFormat.Jpeg);
+    }
+
+    private static string GetPathToImages()
+    {
+        var filename = $"{RectanglesNumber}_TagCloud.jpg";
+        return Path.Combine(ImagesDirectory, filename);
+    }
+
+}

cs/TagsCloudVisualization/README.md

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+### 50 Прямоугольников
+![result](https://i.imgur.com/nbMnER4.jpeg)
+---
+### 100 Прямоугольников
+![result1](https://i.imgur.com/l3GB61c.jpeg)

cs/TagsCloudVisualization/TagsCloudVisualization.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+	<ItemGroup>
+		<PackageReference Include="System.Drawing.Common" Version="6.0.0" />
+	</ItemGroup>
+
+	<ItemGroup>
+	  <Folder Include="Images\" />
+	</ItemGroup>
+
+</Project>

cs/TagsCloudVisualization/Visualizers/IVisualizer.cs

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+using System.Drawing;
+
+namespace TagsCloudVisualization.Visualizers;
+
+public interface IVisualizer
+{
+    public Bitmap CreateBitmap(IEnumerable<Rectangle> rectangles, Size bitmapSize);
+}

cs/TagsCloudVisualization/Visualizers/Visualizer.cs

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+using System.Drawing;
+
+namespace TagsCloudVisualization.Visualizers;
+
+public class Visualizer : IVisualizer
+{
+    public Bitmap CreateBitmap(IEnumerable<Rectangle> rectangles, Size bitmapSize)
+    {
+        var bitmap = new Bitmap(bitmapSize.Width, bitmapSize.Height);
+
+        using var graphics = Graphics.FromImage(bitmap);
+        foreach (var rectangle in rectangles)
+        {
+            var pen = new Pen(Color.Blue);
+            graphics.DrawRectangle(pen, rectangle);
+        }
+
+        return bitmap;
+    }
+}

cs/TagsCloudVisualizationTests/CircularCloudLayouterTests.cs

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+using FluentAssertions;
+using NUnit.Framework.Interfaces;
+using System.Drawing;
+using System.Drawing.Imaging;
+using TagsCloudVisualization.Extensions;
+using TagsCloudVisualization.Layouters;
+using TagsCloudVisualization.Visualizers;
+
+namespace TagsCloudVisualizationTests;
+
+[TestFixture]
+public class CircularCloudLayouterTests
+{
+    private Rectangle[] rectangles;
+    private const string ImagesDirectory = "TestImages";
+
+    private static readonly Point OptimalCenter = new(0, 0);
+    private readonly double OptimalRadius = 1;
+    private readonly double OptimalAngleOffset = 0.5;
+
+    [TearDown]
+    public void TearDown()
+    {
+        var currentContext = TestContext.CurrentContext;
+        if (currentContext.Result.Outcome.Status != TestStatus.Failed)
+            return;
+
+        var visualizer = new Visualizer();
+        var bitmap = visualizer.CreateBitmap(rectangles, GetLayoutSize());
+        Directory.CreateDirectory(ImagesDirectory);
+        bitmap.Save(Path.Combine(ImagesDirectory, currentContext.Test.Name + ".jpg"), ImageFormat.Jpeg);
+
+        TestContext.Out
+            .WriteLine($"Tag cloud visualization saved to file " +
+                       $"{Path.Combine(ImagesDirectory, currentContext.Test.Name + ".jpg")}");
+    }
+
+    [Test]
+    public void CircularCloudLayouter_WhenCorrectArgs_NotThrowArgumentException()
+    {
+        var act = () => new CircularCloudLayouter(new Point(5, 15));
+
+        act.Should().NotThrow<ArgumentException>();
+    }
+
+    [TestCase(-5, -5, TestName = "WithNegativeXAndY")]
+    [TestCase(-5, 5, TestName = "WithNegativeX")]
+    [TestCase(5, -5, TestName = "WithNegativeY")]
+    public void CircularCloudLayouter_WhenIncorrectArgs_ThrowArgumentException(int x, int y)
+    {
+        var act = () => new CircularCloudLayouter(new Point(x, y));
+
+        act.Should().Throw<ArgumentException>();
+    }
+
+    [TestCase(-5, -5, TestName = "WithNegativeWidthAndHeight")]
+    [TestCase(-5, 5, TestName = "WithNegativeWidth")]
+    [TestCase(5, -5, TestName = "WithNegativeHeight")]
+    [TestCase(0, 0, TestName = "WithZeroWidthAndHeight")]
+    public void PutNextRectangle_WhenIncorrectArgs_ThrowArgumentException(int width, int height)
+    {
+        var circularCloudLayouter = new CircularCloudLayouter(new Point(600, 600), 1, 90);
+
+        var act = () => circularCloudLayouter.PutNextRectangle(new Size(width, height));
+
+        act.Should().Throw<ArgumentException>();
+    }
+
+    [Test]
+    public void PutNextRectangle_ShouldReturnRectanglesWithoutIntersections()
+    {
+        var rectanglesNumber = 100;
+        var circularCloudLayouter = new CircularCloudLayouter(OptimalCenter);
+
+        rectangles = circularCloudLayouter.GenerateCloud(rectanglesNumber);
+
+        IsIntersectionBetweenRectangles(rectangles).Should().BeFalse();
+    }
+
+    private static bool IsIntersectionBetweenRectangles(Rectangle[] rectangles)
+    {
+        for (var i = 0; i < rectangles.Length; i++)
+        {
+            for (var j = i + 1; j < rectangles.Length; j++)
+            {
+                if (rectangles[i].IntersectsWith(rectangles[j]))
+                    return true;
+            }
+        }
+
+        return false;
+    }
+
+    [Test]
+    public void TagsCloud_ShouldBeShapeOfCircularCloud_WhenOptimalParameters()
+    {
+        var rectanglesNumber = 1000;
+        var circularCloudLayouter = new CircularCloudLayouter(OptimalCenter, OptimalRadius, OptimalAngleOffset);
+
+        rectangles = circularCloudLayouter.GenerateCloud(rectanglesNumber, 10, 25);
+        var layoutSize = GetLayoutSize();
+        var diametr = Math.Max(layoutSize.Height, layoutSize.Width);
+        var circleArea = Math.PI* Math.Pow(diametr, 2) / 4;
+        var rectanglesArea = (double)rectangles
+            .Select(rectangle => rectangle.Height * rectangle.Width)
+            .Sum();
+        var accuracy = circleArea / rectanglesArea;
+
+        accuracy.Should().BeApproximately(1, 0.35);
+    }
+
+    private Size GetLayoutSize()
+    {
+        var layoutWidth = rectangles.Max(rectangle => rectangle.Right) -
+                          rectangles.Min(rectangle => rectangle.Left);
+        var layoutHeight = rectangles.Max(rectangle => rectangle.Top) -
+                           rectangles.Min(rectangle => rectangle.Bottom);
+        return new Size(layoutWidth, layoutHeight);
+    }
+
+    [Test]
+    public void TagsCloud_ShouldBeDense_WhenOptimalParameters()
+    {
+        var rectanglesNumber = 1000;
+        var circularCloudLayouter = new CircularCloudLayouter(OptimalCenter, OptimalRadius, OptimalAngleOffset);
+        rectangles = circularCloudLayouter.GenerateCloud(rectanglesNumber, 10, 10);
+
+        var expectedRectanglesArea = (double)rectanglesNumber * 10 * 10;
+        var rectanglesArea = (double)rectangles
+            .Select(rectangle => rectangle.Height * rectangle.Width)
+            .Sum();
+        var accuracy = expectedRectanglesArea / rectanglesArea;
+
+        accuracy.Should().BeApproximately(1, 0.2);
+    }
+}