Get repainted regions : Region « 2D Graphics « C# / C Sharp

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C# / C Sharp » 2D Graphics » RegionScreenshots 
Get repainted regions
Get repainted regions



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

  public class Form1 : System.Windows.Forms.Form
  {
    public Form1()
    {
      InitializeComponent();
    }
    private void InitializeComponent()
    {
      this.AutoScaleBaseSize = new System.Drawing.Size(513);
      this.ClientSize = new System.Drawing.Size(292273);
      this.Text = "";
      this.Resize += new System.EventHandler(this.Form1_Resize);
      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.FillRectangle(Brushes.White, this.ClientRectangle);

      SizeF sizeF = g.MeasureString("AA"this.Font);
      StringFormat sf = new StringFormat();
      sf.LineAlignment = StringAlignment.Center;

      // Set properties of the grid
      int cellHeight = (int)sizeF.Height + 200;
      int cellWidth = 200;
      int nbrColumns = 50;
      int nbrRows = 50;

      // Output general info to console
      Console.WriteLine("-------------------------------------------");
      Console.WriteLine("e.ClipRectangle = " + e.ClipRectangle);
      Console.WriteLine("The following cells need to be redrawn " +
                "(in whole or in part):");
      // Draw the cells and the output to console
      for (int row = 0; row < nbrRows; ++row)
      {
        for (int col = 0; col < nbrColumns; ++col)
        {
          Point cellLocation = new Point(col * cellWidth,
                             row * cellHeight);
          Rectangle cellRect = new Rectangle(cellLocation.X,
                             cellLocation.Y,
                             cellWidth, cellHeight);
          if (cellRect.IntersectsWith(e.ClipRectangle))
          {
            Console.WriteLine("Row:{0} Col:{1}", row, col);
            g.FillRectangle(Brushes.White, cellRect);
            g.DrawRectangle(Pens.Black, cellRect);
            String s = String.Format("{0},{1}", col, row);
            g.DrawString(s, this.Font, Brushes.Black, cellRect, sf);
          }
        }
      }
    }

    private void Form1_Resize(object sender, System.EventArgs e)
    {
      Invalidate();
    }
  }

           
       
Related examples in the same category
1.Create a Region whose boundary is the GraphicsPathCreate a Region whose boundary is the GraphicsPath
2.Fill a RegionFill a Region
3.Region ExcludesRegion Excludes
4.Is Region finiteIs Region finite
5.Is Region EmptyIs Region Empty
6.Is a point visible to a RegionIs a point visible to a Region
7.Is this Rectangle visible to the RegionIs this Rectangle visible to the Region
8.Region ClipsRegion Clips
9.Region UnionsRegion Unions
10.Region clips a text pathRegion clips a text path
11.Get Clipping region paintedGet Clipping region painted
12.Fill regionFill region
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