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


namespace testgrfx
{

  public class Form1 : System.Windows.Forms.Form
  {
    float m_Scalef;
    float m_Scalefout;
    Rectangle m_r1;
    private System.Windows.Forms.Button button2;
    private System.Windows.Forms.Button button3;  
    private System.ComponentModel.Container components = null;

      private void InitializeComponent()
      {
        m_Scalef = 1.0f;  // for zooming purposes
        Console.WriteLine("opening m_Scalef= {0}",m_Scalef);
        m_Scalefout = 1.0f;
        Console.WriteLine("opening m_Scalefout= {0}",m_Scalefout);
        m_r1 = new Rectangle(50,50,100,100);
        this.AutoScrollMinSize = new Size(600,700);
        this.components = new System.ComponentModel.Container();

        this.button2 = new System.Windows.Forms.Button();   
        this.button2.BackColor = System.Drawing.Color.LightGray;
        this.button2.Location = new System.Drawing.Point(120, 30);
        this.button2.Name = "button2";
        this.button2.Size = new System.Drawing.Size(72, 24);
        this.button2.TabIndex = 1;
        this.button2.Text = "Zoom In";
        this.button2.Click += new System.EventHandler(this.mnuZoomin_Click);
        this.Controls.Add(button2);

        this.button3 = new System.Windows.Forms.Button();   
        this.button3.BackColor = System.Drawing.Color.LightGray;
        this.button3.Location = new System.Drawing.Point(200, 30);
        this.button3.Name = "button3";
        this.button3.Size = new System.Drawing.Size(72, 24);
        this.button3.TabIndex = 2;
        this.button3.Text = "Zoom Out";
        this.button3.Click += new System.EventHandler(this.mnuZoomout_Click);
        this.Controls.Add(button3);        
        //InitMyForm();
      }

      public Form1()
      {
        InitializeComponent();
        Text = " DrawLine";
        BackColor = SystemColors.Window;
        // Gotta load these kind at start-up ... not with button assignments
        this.Paint+=new PaintEventHandler(this.Form1_Paint);
      }


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

      /// Clean up any resources being used.
      protected override void Dispose( bool disposing )
      {
        if( disposing )
        {
          if (components != null)
          {
            components.Dispose();
          }
        }
        base.Dispose( disposing );
      }


          // autoscroll2.cs does work
      private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
      {
        Graphics dc = e.Graphics;
        dc.PageUnit = GraphicsUnit.Pixel;
        dc.PageScale = m_Scalef;
        Console.WriteLine("opening dc.PageScale= {0}",dc.PageScale);
        dc.TranslateTransform(this.AutoScrollPosition.X/m_Scalef,
           this.AutoScrollPosition.Y/m_Scalef); 
        Pen pn = new Pen(Color.Blue,2);
        dc.DrawEllipse(pn,m_r1);
        Console.WriteLine("form_paint_dc.PageUnit= {0}",dc.PageUnit);
        Console.WriteLine("form_paint_dc.PageScale= {0}",dc.PageScale);
        //Console.Out.NewLine = "\r\n\r\n";  // makes all double spaces
      }



      private void mnuZoomin_Click(object sender, System.EventArgs e)
      {
        m_Scalef = m_Scalef * 2.0f;
        Console.WriteLine("in mnuZoomin_Click m_Scalef= {0}",m_Scalef);
        Invalidate();  // to trigger Paint of entire client area
      }


            // try:  System.Drawing.Rectangle resolution = Screen.GetWorkingArea(someForm); 
      private void Form1_MouseDown(object sender,   System.Windows.Forms.MouseEventArgs e)
      {
        // Uses the mouse wheel to scroll

        Graphics dc = CreateGraphics();
        dc.TranslateTransform(this.AutoScrollPosition.X/m_Scalef,
          this.AutoScrollPosition.Y/m_Scalef);
        Console.WriteLine("opening Form1_MouseDown dc.PageScale= {0}",
                                dc.PageScale);
        Console.WriteLine("Y wheel= {0}", this.AutoScrollPosition.Y/m_Scalef);
        dc.PageUnit = GraphicsUnit.Pixel;
        dc.PageScale = m_Scalef;
        Console.WriteLine("frm1_moudwn_dc.PageScale= {0}",dc.PageScale);

        Point [] mousep = new Point[1];
        Console.WriteLine("mousep= {0}", mousep);
        // make sure to adjust mouse pos.for scroll position
        Size scrollOffset = new Size(this.AutoScrollPosition);
        mousep[0] = new Point(e.X-scrollOffset.Width, e.Y-scrollOffset.Height);
        dc.TransformPoints(CoordinateSpace.Page, CoordinateSpace.Device,mousep);
          Pen pen = new Pen(Color.Green,1);
        dc.DrawRectangle(pen,m_r1);
        Console.WriteLine("m_r1= {0}", m_r1);
        Console.WriteLine("mousep[0].X= {0}", mousep[0].X);
        Console.WriteLine("mousep[0].Y= {0}", mousep[0].Y);
        if (m_r1.Contains(new Rectangle(mousep[0].X, mousep[0].Y,1,1)))
          MessageBox.Show("click inside rectangle");
      }


      private void Form1_Load(object sender, System.EventArgs e)
      {
      }

      private void mnuZoomout_Click(object sender, System.EventArgs e)
      {
        Console.WriteLine("first line--mnuZoomout_Click m_Scalef={0}",m_Scalef);
        if(m_Scalef > 9 )
        {
                 m_Scalef = m_Scalef / 2.0f;
                     Console.WriteLine("in >9 mnuZoomout_Click m_Scalef= {0}",m_Scalef);
                     Console.WriteLine("in >9 mnuZoomout_Click__m_Scalefout= {0}",m_Scalefout);
        }
        else
        {
             Console.WriteLine("<= 9_Zoom-out B-4 redefining={0}",m_Scalef);
             m_Scalef = m_Scalef * 0.5f;  // make it same as previous Zoom In
                 Console.WriteLine("<= 9_Zoom-out after m_Scalef= {0}",m_Scalef);
        }
        Invalidate();
      }








  }  // public class Form1

}