// Experiment with drawing on Forms.  This too is slow.
// sestoft@dina.kvl.dk * 2005-05-03

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

class MyTest {
  public static void Main(String[] args) {
    Form form = new Form();
    form.Text = "Inferial Bio";
    TheatrePanel panel = new TheatrePanel(10, 15);
    form.Controls.Add(panel);
    form.ClientSize = panel.Size;
    form.StartPosition = FormStartPosition.CenterScreen;
    form.ShowDialog();
  }
}

public class TheatrePanel : Panel { 
  private int sw = 20, sh = 20;
  private bool[,] seats;
  
  public TheatrePanel(int rows, int cols) {
    this.seats = new bool[rows,cols];  // false = free, true = sold
    this.BackColor = Color.White;
    this.Size = new Size(seats.GetLength(1) * sw, seats.GetLength(0) * sh);
    // Use double buffering in graphics to avoid flickering on repaint:
    this.SetStyle(ControlStyles.AllPaintingInWmPaint 
                  | ControlStyles.UserPaint 
                  | ControlStyles.OptimizedDoubleBuffer, true);
  }
  
  protected override void OnPaint(PaintEventArgs e) {
    if (seats != null) {
      Graphics g = e.Graphics;
      SolidBrush brush = new SolidBrush(Color.Gray);
      for (int row=0; row<seats.GetLength(0); row++) {
        for (int col=0; col<seats.GetLength(1); col++) { 
          Rectangle rect = new Rectangle(col*sw, row*sh, 15, 15);
          brush.Color = seats[row,col] ? Color.Red : Color.Green;
          g.FillEllipse(brush, rect);
        }
      }
    }
  }

  protected override void OnMouseClick(MouseEventArgs e) {
    if (seats != null) {
      int col = e.X / sw, row = e.Y / sh;
      if (0 <= row && row < seats.GetLength(0) && 
          0 <= col && col < seats.GetLength(1)) {
        seats[row,col] = !seats[row,col];
        Invalidate();
      }
    }
  }
}