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Posted 14 Jun 2011
Licenced CPOL

Fast Optimizing Rectangle Packing Algorithm for Building CSS Sprites

, 14 Jun 2011
Describes a fast algorithm to pack a series of rectangles of varying widths and heights into an enclosing rectangle of minimum size
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Drawing;

/// <summary>
/// Generates random sizes (which consist of a width and a height).
/// </summary>
public class RandomSizeGenerator
    private int _minWidth = 10;
    private int _maxWidth = 200;

    // If this is 70, than Height will be 30% to 170% of Width
    private int _maxAspectRatioDeviationPercentage = 70;

    private Random _r = null;

    public RandomSizeGenerator(int minWidth, int maxWidth, int maxAspectRatioDeviationPercentage)
        _r = new Random();

        _minWidth = minWidth;
        _maxWidth = maxWidth;
        _maxAspectRatioDeviationPercentage = maxAspectRatioDeviationPercentage;

    /// <summary>
    /// Returns the next ImageInfo with random width and height
    /// </summary>
    /// <returns></returns>
    public ImageInfo Next()
        int width = _r.Next(_minWidth, _maxWidth);
        int height =
                (int)Math.Round(((100 - _maxAspectRatioDeviationPercentage) * width) / (double)100),
                (int)Math.Round(((100 + _maxAspectRatioDeviationPercentage) * width) / (double)100));

        ImageInfo s = new ImageInfo(width, height);

        return s;

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About the Author

Matt Perdeck
Australia Australia
Twitter: @MattPerdeck
Current project: JSNLog JavaScript Logging Package

Matt has over 9 years .NET and SQL Server development experience. Before getting into .Net, he worked on a number of systems, ranging from the largest ATM network in The Netherlands to embedded software in advanced Wide Area Networks and the largest ticketing web site in Australia. He has lived and worked in Australia, The Netherlands, Slovakia and Thailand.

He is the author of the book ASP.NET Performance Secrets ( in which he shows in clear and practical terms how to quickly find the biggest bottlenecks holding back the performance of your web site, and how to then remove those bottlenecks. The book deals with all environments affecting a web site - the web server, the database server and the browser.

Matt currently lives in Sydney, Australia. He recently worked at Readify and the global professional services company PwC. He now works at SP Health, a global provider of weight loss web sites such at CSIRO's and

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