Improve drawing

Isolate configurable parameters.

GameOfLife/MainForm.cs

@@ -1,11 +1,6 @@
 using System;
 using System.Collections.Generic;
-using System.ComponentModel;
-using System.Data;
 using System.Drawing;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 using System.Windows.Forms;
 
 namespace GameOfLife
@@ -20,11 +15,13 @@ namespace GameOfLife
 
         private Random random;
 
-        private int gridSize = 4;
+        private int gridSize = 8;
 
         private int magicCells = 0;
 
-        private double density = 0.45;
+        private double density = 0.35;
+
+        private int interval = 500;
 
         public MainForm(Rectangle bounds)
         {
@@ -49,7 +46,7 @@ namespace GameOfLife
             Cursor.Hide();
             TopMost = true;
 
-            timer.Interval = 50;
+            timer.Interval = interval;
             timer.Tick += new EventHandler(timer_Tick);
             timer.Start();
         }
@@ -159,20 +156,29 @@ namespace GameOfLife
         }
 
         private void Redraw(Graphics graphics) {
-            graphics.FillRectangle(Brushes.Black, Bounds);
+            List<Rectangle> liveCells = new List<Rectangle>();
+            List<Rectangle> deadCells = new List<Rectangle>();
+
             for (var x = 0; x < newCells.GetLength(0); x++)
             {
                 for (var y = 0; y < newCells.GetLength(1); y++)
                 {
                     if (newCells[x, y])
                     {
-                        graphics.FillRectangle(Brushes.White, x * gridSize, y * gridSize, gridSize, gridSize);
+                        liveCells.Add(new Rectangle(x * gridSize, y * gridSize, gridSize, gridSize));
+                    }
+                    else {
+                        deadCells.Add(new Rectangle(x * gridSize, y * gridSize, gridSize, gridSize));
                     }
                     //else if (!newCells[x, y]) {
                     //    graphics.FillRectangle(Brushes.Black, x * gridSize, y * gridSize, gridSize, gridSize);
                     //}
                 }
             }
+
+            graphics.FillRectangle(Brushes.Black, Bounds);
+            //graphics.FillRectangles(Brushes.Black, deadCells.ToArray());
+            graphics.FillRectangles(Brushes.White, liveCells.ToArray());
         }
 
         private void MainForm_Paint(object sender, PaintEventArgs e)