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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.Text;

namespace Mapper
    /// <summary>
    /// Defines the statistics to be produced by an IMapperIterative.
    /// </summary>
    public interface IMapperStats
        /// <summary>
        /// Number of times the mapper tried to create a sprite, but failed to do so.
        /// For example, if it uses a canvas with a certain size, the canvas may have been too small
        /// to place all images.
        /// </summary>
        int CandidateSpriteFails { get; set; }

        /// <summary>
        /// Number of candidate sprites successfully generated by the mapper.
        /// A mapper would return only the best of the candidate sprites from its Mapping method.
        /// </summary>
        int CandidateSpritesGenerated { get; set; }

        /// <summary>
        /// Number of times an attempt was made to add an image to the canvas used by the mapper.
        /// </summary>
        int CanvasRectangleAddAttempts { get; set; }

        /// <summary>
        /// Number of cells generated by the canvas used by the mapper.
        /// </summary>
        int CanvasNbrCellsGenerated { get; set; }


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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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