This program draws snow crystal on the console looks like in the below img. You can even set speed by using options menu.



namespace SnowCrystal.Simple
{
using System;
public class Cell
{
public static int NULL = 0;
public static int VAPOR = 1;
public static int INTERFACE = 2;
public static int ICE = 3;
public int x;
public int y;
public Cell[] nb = new Cell[6];
public int state = NULL;
public int[] dir = new int[6];
public int time = 0;
public int store = 0;
public bool painted = false;
private Crystal crystal;
public Cell(Crystal c,int x, int y)
{
crystal = c;
if (x>crystal.Max) crystal.Max = x;
this.x = x;
this.y = y;
for (int i=0; i<6;i++)
{
this.nb[i] = null;
this.dir[i] = i;
}
crystal.list[NULL].Add(this);
}
public void link(int n, Cell b)
{
this.nb[n] = b;
b.nb[(n+3) % 6] = this;
}
public void setState(int state)
{
if (this.x == crystal.Max) crystal.Stop();
if ((state == NULL) || (this.state >= state)) return;
crystal.list[this.state].Remove(this);
this.state = state;
this.store = 0;
this.time = 0;
crystal.list[this.state].Add(this);
state--;
for (int i = 0; i <6; i++)
if (this.nb[i] != null) this.nb[i].setState(state);
}
public void resetState()
{
crystal.list[this.state].Remove(this);
this.state--;
crystal.list[this.state].Add(this);
this.time = 0;
this.store = 0;
}
}
}

namespace SnowCrystal.Simple
{
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.WinForms;
/// <summary>
/// Summary description for ControlPanel.
/// </summary>
public class ControlPanel : System.WinForms.Form
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components;
private System.WinForms.Button Toggle;
private System.WinForms.TrackBar Speed;
private System.WinForms.GroupBox SpeedControl;
private Snowflake snowflake;
public ControlPanel(Snowflake snowflake)
{
//
// Required for Windows Form Designer support
//
this.snowflake = snowflake;
InitializeComponent();
Speed.Value = Speed.Maximum -snowflake.Wait;
//
// TODO: Add any constructor code after InitializeComponent call
//
}
/// <summary>
/// Clean up any resources being used.
/// </summary>
public override void Dispose()
{
base.Dispose();
components.Dispose();
}
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.components = new System.ComponentModel.Container ();
this.Speed = new System.WinForms.TrackBar ();
this.SpeedControl = new System.WinForms.GroupBox ();
this.Toggle = new System.WinForms.Button ();
Speed.BeginInit ();
//@this.TrayHeight = 0;
//@this.TrayLargeIcon = false;
//@this.TrayAutoArrange = true;
Speed.LargeChange = 1;
Speed.Location = new System.Drawing.Point (8, 16);
Speed.TabIndex = 2;
Speed.Value = 1;
Speed.Maximum = 5;
Speed.Size = new System.Drawing.Size (96, 42);
Speed.Scroll += new System.EventHandler (this.Speed_Scroll);
SpeedControl.Location = new System.Drawing.Point (16, 8);
SpeedControl.TabIndex = 3;
SpeedControl.TabStop = false;
SpeedControl.Text = "Speed";
SpeedControl.Size = new System.Drawing.Size (112, 64);
Toggle.Location = new System.Drawing.Point (16, 80);
Toggle.Size = new System.Drawing.Size (112, 24);
Toggle.TabIndex = 4;
Toggle.Text = "Stop";
Toggle.Click += new System.EventHandler (this.Toggle_Click);
this.Text = "Snow Crystal Options";
this.StartPosition = System.WinForms.FormStartPosition.CenterParent;
this.AutoScaleBaseSize = new System.Drawing.Size (5, 13);
this.BorderStyle = System.WinForms.FormBorderStyle.FixedToolWindow;
this.ClientSize = new System.Drawing.Size (146, 122);
SpeedControl.Controls.Add (this.Speed);
this.Controls.Add (this.Toggle);
this.Controls.Add (this.SpeedControl);
Speed.EndInit ();
}
private bool running = true;
protected void Toggle_Click (object sender, System.EventArgs e)
{
if (running)
{
snowflake.Stop();
Toggle.Text = "Start";
}
else
{
snowflake.Start();
Toggle.Text = "Stop";
}
running = ! running;
}
protected void Speed_Scroll (object sender, System.EventArgs e)
{
snowflake.Wait = Speed.Maximum - Speed.Value;
}
}
}