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A Fast Priority Queue Implementation of the Dijkstra Shortest Path Algorithm

, 4 Aug 2013 CPOL
Anyone needs a fast, efficient algorithm to compute the shortest path in C#? This article provides one.
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DataStructTest
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namespace DataStructTest
{
    partial class Form1
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.listBox1 = new System.Windows.Forms.ListBox();
            this.button1 = new System.Windows.Forms.Button();
            this.label1 = new System.Windows.Forms.Label();
            this.label2 = new System.Windows.Forms.Label();
            this.textBox1 = new System.Windows.Forms.TextBox();
            this.label3 = new System.Windows.Forms.Label();
            this.textBox2 = new System.Windows.Forms.TextBox();
            this.label4 = new System.Windows.Forms.Label();
            this.textBox3 = new System.Windows.Forms.TextBox();
            this.button2 = new System.Windows.Forms.Button();
            this.label5 = new System.Windows.Forms.Label();
            this.SuspendLayout();
            // 
            // listBox1
            // 
            this.listBox1.FormattingEnabled = true;
            this.listBox1.Location = new System.Drawing.Point(15, 116);
            this.listBox1.Name = "listBox1";
            this.listBox1.Size = new System.Drawing.Size(169, 277);
            this.listBox1.TabIndex = 0;
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(190, 116);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(273, 64);
            this.button1.TabIndex = 1;
            this.button1.Text = "Compute Shortest Path";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // label1
            // 
            this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point(12, 100);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(61, 13);
            this.label1.TabIndex = 2;
            this.label1.Text = "Path Points";
            // 
            // label2
            // 
            this.label2.AutoSize = true;
            this.label2.Location = new System.Drawing.Point(12, 13);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(65, 13);
            this.label2.TabIndex = 3;
            this.label2.Text = "Total Nodes";
            // 
            // textBox1
            // 
            this.textBox1.Location = new System.Drawing.Point(84, 5);
            this.textBox1.Name = "textBox1";
            this.textBox1.Size = new System.Drawing.Size(100, 20);
            this.textBox1.TabIndex = 4;
            this.textBox1.Text = "100000";
            // 
            // label3
            // 
            this.label3.AutoSize = true;
            this.label3.Location = new System.Drawing.Point(12, 39);
            this.label3.Name = "label3";
            this.label3.Size = new System.Drawing.Size(61, 13);
            this.label3.TabIndex = 5;
            this.label3.Text = "Start Node:";
            // 
            // textBox2
            // 
            this.textBox2.Location = new System.Drawing.Point(83, 32);
            this.textBox2.Name = "textBox2";
            this.textBox2.Size = new System.Drawing.Size(100, 20);
            this.textBox2.TabIndex = 6;
            this.textBox2.Text = "200";
            // 
            // label4
            // 
            this.label4.AutoSize = true;
            this.label4.Location = new System.Drawing.Point(12, 65);
            this.label4.Name = "label4";
            this.label4.Size = new System.Drawing.Size(58, 13);
            this.label4.TabIndex = 7;
            this.label4.Text = "End Node:";
            // 
            // textBox3
            // 
            this.textBox3.Location = new System.Drawing.Point(83, 58);
            this.textBox3.Name = "textBox3";
            this.textBox3.Size = new System.Drawing.Size(100, 20);
            this.textBox3.TabIndex = 8;
            this.textBox3.Text = "60000";
            // 
            // button2
            // 
            this.button2.Location = new System.Drawing.Point(189, 5);
            this.button2.Name = "button2";
            this.button2.Size = new System.Drawing.Size(274, 73);
            this.button2.TabIndex = 9;
            this.button2.Text = "Initialize Dijkstra";
            this.button2.UseVisualStyleBackColor = true;
            this.button2.Click += new System.EventHandler(this.button2_Click);
            // 
            // label5
            // 
            this.label5.AutoSize = true;
            this.label5.Location = new System.Drawing.Point(369, 380);
            this.label5.Name = "label5";
            this.label5.Size = new System.Drawing.Size(78, 13);
            this.label5.TabIndex = 10;
            this.label5.Text = "By Tolga Birdal";
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(465, 410);
            this.Controls.Add(this.label5);
            this.Controls.Add(this.button2);
            this.Controls.Add(this.textBox3);
            this.Controls.Add(this.label4);
            this.Controls.Add(this.textBox2);
            this.Controls.Add(this.label3);
            this.Controls.Add(this.textBox1);
            this.Controls.Add(this.label2);
            this.Controls.Add(this.label1);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.listBox1);
            this.Name = "Form1";
            this.Text = "Dijkstra Shortest Path";
            this.Load += new System.EventHandler(this.Form1_Load);
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.ListBox listBox1;
        private System.Windows.Forms.Button button1;
        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.Label label2;
        private System.Windows.Forms.TextBox textBox1;
        private System.Windows.Forms.Label label3;
        private System.Windows.Forms.TextBox textBox2;
        private System.Windows.Forms.Label label4;
        private System.Windows.Forms.TextBox textBox3;
        private System.Windows.Forms.Button button2;
        private System.Windows.Forms.Label label5;
    }
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Tolga Birdal
CEO Gravi Information Technologies and Consultancy Ltd
Turkey Turkey
Currently, also an MSc. student in Technical University of Munich, I develop practical application in computer vision for more than 5 years. I design real-time solutions to industrial and practical vision problems, both 3D and 2D. Very interested in developing algorithms in C relating math and vision.
 
Please visit Gravi's web page (http://www.gravi.com.tr) and my page (http://www.tbirdal.me) to learn more about what we develop.
 
I admire performance in algorithms.
 
"Great minds never die, they just tend to infinity..."
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