C# Tutorials

Floating tool window

admin — Thu, 09 Apr 2009 13:26:10 +0000

Floating tool window / tool strip with parent window’s title bar remain active all the time.

Download source code (Microsoft Visual C# 2005 Express Edition)

Free shape file (*.shp) viewer

admin — Wed, 08 Apr 2009 03:30:46 +0000

Download source code (Microsoft Visual C# 2005 Express Edition)
Download executable file

Note: This beta version only supports point, line and polygon.

Drawing wave line in C#

admin — Tue, 31 Mar 2009 10:49:25 +0000

Download source code (Microsoft Visual C# 2005 Express Edition)

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;

namespace Tutorial6
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void pictureBox1_Paint(object sender, PaintEventArgs e)
        {
            e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
            PointF[] pt = new PointF[] {
                new PointF(50,50),
                new PointF(150,50),
                new PointF(200,100),
                new PointF(200,200),
            };
            e.Graphics.DrawLines(Pens.Gray, pt);
            List PointList = new List();
            float curDist = 0;
            float distance = 0;
            for (int i = 0; i < pt.Length - 1; i++)
            {
                PointF ptA = pt[i];
                PointF ptB = pt[i + 1];
                float deltaX = ptB.X - ptA.X;
                float deltaY = ptB.Y - ptA.Y;
                curDist = 0;
                distance = (float)Math.Sqrt(Math.Pow(deltaX, 2) + Math.Pow(deltaY, 2));
                while (curDist < distance)
                {
                    curDist++;
                    float offsetX = (float)((double)curDist / (double)distance * (double)deltaX);
                    float offsetY = (float)((double)curDist / (double)distance * (double)deltaY);
                    PointList.Add(new PointF(ptA.X + offsetX, ptA.Y + offsetY));
                }
            }
            for (int i = 0; i < PointList.Count - 24; i = i + 24)
            {
                drawWaveLine(e.Graphics, Pens.Black, PointList[i].X, PointList[i].Y, PointList[i + 24].X, PointList[i + 24].Y);
            }
        }

        public void drawWaveLine(Graphics g, Pen pen, float x1, float y1, float x2, float y2)
        {
            float angle = (float)((Math.Atan2(y2 - y1, x2 - x1) * 180 / 3.14159265));
            g.TranslateTransform(x1, y1);
            g.RotateTransform(angle);
            GraphicsPath gp1 = new GraphicsPath();
            Point[] p1 = new Point[] {
                new Point(0,0),
                new Point(3,-3),
                new Point(6,-4),
                new Point(9,-3),
                new Point(12,0),
                new Point(15,3),
                new Point(18,4),
                new Point(21,3),
                new Point(24,0)
            };
            g.DrawLines(pen, p1);
            g.RotateTransform(-angle);
            g.TranslateTransform(-x1, -y1);
        }

    }
}

Drawing lines pixel by pixel in C#

admin — Tue, 31 Mar 2009 06:26:36 +0000

Drawing lines pixel by pixel using timer so user can see the animation.

Download source code (Microsoft Visual C# 2005 Express Edition)

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;

namespace WindowsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        List PointList = new List();
        int pointIndex = 0;

        private void Form1_Load(object sender, EventArgs e)
        {
            SetStyle(ControlStyles.UserPaint, true);
            SetStyle(ControlStyles.AllPaintingInWmPaint, true);
            SetStyle(ControlStyles.DoubleBuffer, true);
            PointF[] pt = new PointF[] {
                new PointF(100, 100),
                new PointF(150, 150),
                new PointF(200, 100),
                new PointF(100, 100),

            };
            // Get Points From Line(s)
            float curDist = 0;
            float distance = 0;
            for (int i = 0; i < pt.Length - 1; i++)
            {
                PointF ptA = pt[i];
                PointF ptB = pt[i + 1];
                float deltaX = ptB.X - ptA.X;
                float deltaY = ptB.Y - ptA.Y;
                curDist = 0;
                distance = (float)Math.Sqrt(Math.Pow(deltaX, 2) + Math.Pow(deltaY, 2));
                while (curDist < distance)
                {
                    curDist++;
                    float offsetX = (float)((double)curDist / (double)distance * (double)deltaX);
                    float offsetY = (float)((double)curDist / (double)distance * (double)deltaY);
                    PointList.Add(new PointF(ptA.X + offsetX, ptA.Y + offsetY));
                }
            }
        }

        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
            for (int i = 0; i < pointIndex; i++)
            {
                e.Graphics.DrawLine(Pens.Black, PointList[i].X, PointList[i].Y, PointList[i + 1].X, PointList[i + 1].Y);
            }
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            if (pointIndex < PointList.Count - 1)
            {
                pointIndex++;
                this.Refresh();
            }
        }
    }
}

Extract picture in zip file and display in a picture box

admin — Fri, 13 Mar 2009 13:00:30 +0000

We will be using SharpZipLib which can be downloaded from

http://www.icsharpcode.net/OpenSource/SharpZipLib/Download.aspx

Click on the Download for Assemblies for .NET 1.1, .NET 2.0, .NET CF 1.0, .NET CF 2.0

Once you’ve downloaded the ZIP file, extract it and load the ICSharpCode.SharpZipLib.dll depends on the version of .NET you are using by going to Project > Add Reference > Browse.

The following code load the image Sunset.jpg from D:Sunset.zip and display in PictureBox1.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

using System.IO;
using ICSharpCode.SharpZipLib.Zip;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        FileStream fileStream;
        ZipFile zipFile;
        ZipEntry zipEntry;
        Stream stream;
        Bitmap bitmap;

        private void Form1_Load(object sender, EventArgs e)
        {
            fileStream = new FileStream("D:\Sunset.zip", FileMode.Open, FileAccess.Read);
            zipFile = new ZipFile(fileStream);
            zipEntry = zipFile.GetEntry("Sunset.jpg");
            stream = zipFile.GetInputStream(zipEntry);
            bitmap = new Bitmap(stream);
            pictureBox1.Image = bitmap;
        }
    }
}

Drawing and rotating text on form

admin — Thu, 12 Mar 2009 11:51:25 +0000

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            e.Graphics.TranslateTransform(100, 100);
            e.Graphics.RotateTransform(45);
            e.Graphics.DrawString("Hello World", new Font("Arial", 20), Brushes.Red, new Point(0, 0), StringFormat.GenericDefault);
        }
    }
}

Drawing an anti aliased circle on form

admin — Mon, 09 Mar 2009 11:28:54 +0000

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
            e.Graphics.DrawEllipse(Pens.Red, 50, 50, 100, 100);
        }
    }
}

Drawing a circle on C# form

admin — Sat, 07 Mar 2009 11:11:05 +0000

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            e.Graphics.DrawEllipse(Pens.Red, 50, 50, 100, 100);
        }
    }
}