Conway's Game of Life

This is conway's game of life. The rules are  If one cell is alive, then it stays alive if it has either 2 or 3 live neighbors. If the cell is dead, then it springs to life only in the case that it has 3 live neighbors.

Just draw patterns and hit space bar. It will start the game.
Press space bar again to pause. Toggle between paused and unpaused with the space bar. 
Mouse to draw patterns.