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(5, 13);
this.ClientSize = new System.Drawing.Size(292, 273);
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();
}
}
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