using System;
using System.Drawing;
using System.Windows.Forms;
   
class Bezier: Form
{
     protected Point[] apt = new Point[4];
   
     public static void Main()
     {
          Application.Run(new Bezier());
     }
     public Bezier()
     {
          ResizeRedraw = true;
   
          OnResize(EventArgs.Empty);
     }
     protected override void OnResize(EventArgs ea)
     {
          base.OnResize(ea);
   
          int cx = ClientSize.Width;
          int cy = ClientSize.Height;
   
          apt[0] = new Point(    cx / 4,     cy / 2);
          apt[1] = new Point(    cx / 2,     cy / 4);
          apt[2] = new Point(    cx / 2, 3 * cy / 4);
          apt[3] = new Point(3 * cx / 4,     cy / 2);
     }
     protected override void OnMouseDown(MouseEventArgs mea)
     {
          Point pt;
   
          if (mea.Button == MouseButtons.Left)
               pt = apt[1];
   
          else if (mea.Button == MouseButtons.Right)
               pt = apt[2];
   
          else
               return;
   
          Cursor.Position = PointToScreen(pt);
     }
     protected override void OnMouseMove(MouseEventArgs mea)
     {
          if (mea.Button == MouseButtons.Left)
          {
               apt[1] = new Point(mea.X, mea.Y);
               Invalidate();
          }
          else if (mea.Button == MouseButtons.Right)
          {
               apt[2] = new Point(mea.X, mea.Y);
               Invalidate();
          }
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          Graphics grfx = pea.Graphics;
   
          grfx.DrawBeziers(new Pen(ForeColor), apt);
   
          Pen pen = new Pen(Color.FromArgb(0x80, ForeColor));
   
          grfx.DrawLine(pen, apt[0], apt[1]);
          grfx.DrawLine(pen, apt[2], apt[3]);
     }
}

    

using System;
using System.Drawing;
using System.Windows.Forms;

class Spiral: Form
{
public static void Main()
{
Application.Run(new Spiral());
}
public Spiral()
{
ResizeRedraw = true;
}
protected override void OnPaint(PaintEventArgs pea)
{
DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
}
protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
{
const int iNumRevs = 20;
int iNumPoints = iNumRevs * 2 * (cx + cy);
PointF[] aptf = new PointF[iNumPoints];
float fAngle, fScale;

for (int i = 0; i < iNumPoints; i++) { fAngle = (float)(i * 2 * Math.PI /(iNumPoints / iNumRevs)); fScale = 1 - (float)i / iNumPoints; aptf[i].X = (float)(cx / 2 * (1 + fScale * Math.Cos(fAngle))); aptf[i].Y = (float)(cy / 2 * (1 + fScale * Math.Sin(fAngle))); } grfx.DrawLines(new Pen(clr), aptf); } } [/csharp]

using System;
using System.Drawing;
using System.Windows.Forms;

class PolyEllipse: Form
{
public static void Main()
{
Application.Run(new PolyEllipse());
}
public PolyEllipse()
{
Text = “Ellipse with DrawLines”;
ResizeRedraw = true;
}
protected override void OnPaint(PaintEventArgs pea)
{
DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
}
protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
{
int iNum = 2 * (cx + cy);
PointF[] aptf = new PointF[iNum];

for (int i = 0; i < iNum; i++) { double dAng = i * 2 * Math.PI / (iNum - 1); aptf[i].X = (cx - 1) / 2f * (1 + (float)Math.Cos(dAng)); aptf[i].Y = (cy - 1) / 2f * (1 + (float)Math.Sin(dAng)); } grfx.DrawLines(new Pen(clr), aptf); } } [/csharp]

using System;
using System.Drawing;
using System.Windows.Forms;

class SineCurve: Form
{
public static void Main()
{
Application.Run(new SineCurve());
}
public SineCurve()
{
Text = “Sine Curve”;
ResizeRedraw = true;
}
protected override void OnPaint(PaintEventArgs pea)
{
DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
}
protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
{
PointF[] aptf = new PointF[cx];

for (int i = 0; i < cx; i++) { aptf[i].X = i; aptf[i].Y = cy / 2 * (1 -(float) Math.Sin(i * 2 * Math.PI / (cx - 1))); } grfx.DrawLines(new Pen(clr), aptf); } } [/csharp]

   


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

  public class Form1 : System.Windows.Forms.Form
  {
    public Form1()
    {
      InitializeComponent();
      SetStyle(ControlStyles.ResizeRedraw, true);
    }
    private void InitializeComponent()
    {
      this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
      this.ClientSize = new System.Drawing.Size(400, 400);
      this.Text = "";
      this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);

    }

    static void Main() 
    {
      Application.Run(new Form1());
    }

    private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
    {
      Graphics g = e.Graphics;
      g.SmoothingMode = SmoothingMode.AntiAlias;
  
      g.PageUnit = GraphicsUnit.Pixel;

        Point renderingOrgPt = new Point(0,0);

      renderingOrgPt.X = 100;
      renderingOrgPt.Y = 100;

      g.TranslateTransform(renderingOrgPt.X,
        renderingOrgPt.Y);

      g.DrawRectangle(new Pen(Color.Red, 1), 0, 0, 100, 100);
      
      g.Dispose();

    }
  }


           
          

   


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

  public class Form1 : System.Windows.Forms.Form
  {
    public Form1()
    {
      InitializeComponent();
      SetStyle(ControlStyles.ResizeRedraw, true);
    }
    private void InitializeComponent()
    {
      this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
      this.ClientSize = new System.Drawing.Size(400, 400);
      this.Text = "";
      this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);

    }

    static void Main() 
    {
      Application.Run(new Form1());
    }

    private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
    {
      Graphics g = e.Graphics;
      g.SmoothingMode = SmoothingMode.AntiAlias;
      g.PageUnit = GraphicsUnit.Inch;

        Point renderingOrgPt = new Point(0,0);
      renderingOrgPt.X = 1;
      renderingOrgPt.Y = 1;

      g.TranslateTransform(renderingOrgPt.X,renderingOrgPt.Y);
      g.DrawRectangle(new Pen(Color.Red, 1), 0, 0, 100, 100);
      g.Dispose();
    }
  }
           
          

   
 
// crudwork
// Copyright 2004 by Steve T. Pham (http://www.crudwork.com)
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with This program.  If not, see <http://www.gnu.org/licenses/>.

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;

namespace crudwork.Utilities
{
  /// <summary>
  /// Color Utility
  /// </summary>
  public static class ColorUtil
  {
    private static Random random = new Random();
    private static int r;
    private static int g;
    private static int b;

    /// <summary>
    /// Return a randomly-generated color
    /// </summary>
    /// <returns></returns>
    public static Color GetRandomColor()
    {
      r = random.Next(0, 256);
      g = random.Next(0, 256);
      b = random.Next(0, 256);
      return Color.FromArgb(r, g, b);
    }
  }
}