Overview: This code snippet show how to use threads to change characters in four button squares to spell a word moving across the screen. The c# code will be converted to swift for a spelling game where kids whack at goofers to spell a word.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace SpellingApp
{
public partial class Form1 : Form
{
List<string> colWords = new List<string>();
string selWord;
int alphabet_index = 0;
Thread threadOne;
Thread threadTwo;
Thread threadThree;
Thread threadFour;
private void RandomWord()
{
Random ran = new Random();
int index = ran.Next(0, colWords.Count);
selWord = colWords[index];
labelWord.Text = selWord;
txtCharacter1.Visible = false;
txtCharacter2.Visible = false;
txtCharacter3.Visible = false;
txtCharacter4.Visible = false;
txtCharacter5.Visible = false;
for (int i = 1; i <= selWord.Length; i++)
{
this.Controls["txtCharacter" + i].Visible = true;
this.Controls["txtCharacter" + i].Text = "";
}
}
public Form1()
{
InitializeComponent();
colWords.Add("cat");
colWords.Add("dog");
colWords.Add("rat");
colWords.Add("kid");
colWords.Add("mouse");
colWords.Add("house");
colWords.Add("heat");
colWords.Add("sheep");
RandomWord();
txtTry.KeyDown += (sender, args) => {
if (args.KeyCode == Keys.Return)
{
cmdTry.PerformClick();
}
};
}
private void UpdateButtonText(Button cmd, char character)
{
MethodInvoker action = delegate
{ cmd.Text = character.ToString(); };
if (cmd.InvokeRequired)
{
cmd.BeginInvoke(action);
}
}
private void UpdateText(TextBox txtBox, char character)
{
MethodInvoker action = delegate
{ txtBox.Text = character.ToString(); };
if (txtBox.InvokeRequired)
{
txtBox.BeginInvoke(action);
}
else
{
txtBox.Text = character.ToString();
}
}
private void MatchLetters(char character)
{
int matchIndex = -1;
matchIndex = selWord.IndexOf(character);
switch (matchIndex)
{
case 0:
UpdateText(txtCharacter1, character);
break;
case 1:
UpdateText(txtCharacter2, character);
break;
case 2:
UpdateText(txtCharacter3, character);
break;
case 3:
UpdateText(txtCharacter4, character);
break;
case 4:
UpdateText(txtCharacter5, character);
break;
}
string result = txtCharacter1.Text + txtCharacter2.Text + txtCharacter3.Text + txtCharacter4.Text + txtCharacter5.Text;
if (result == selWord)
{
MessageBox.Show("You Win!");
}
}
private void cmdTry_Click(object sender, EventArgs e)
{
MatchLetters(txtTry.Text.ToString()[0]);
txtTry.Text = "";
txtTry.Focus();
}
private void cmdRandomize_Click(object sender, EventArgs e)
{
RandomWord();
}
private void Form1_Unload(object sender, EventArgs e)
{
threadOne.Abort();
threadTwo.Abort();
threadThree.Abort();
threadFour.Abort();
}
private void Form1_Load(object sender, EventArgs e)
{
RandomWord();
timer1.Start();
threadOne = new Thread(new ThreadStart(this.RandomButtonOne));
threadTwo = new Thread(new ThreadStart(this.RandomButtonTwo));
threadThree = new Thread(new ThreadStart(this.RandomButtonThree));
threadFour = new Thread(new ThreadStart(this.RandomButtonFour));
threadOne.Start();
threadTwo.Start();
threadThree.Start();
threadFour.Start();
}
private void RandomButtonOne()
{
while(1==1)
{
RandomCharacter(cmdOne);
Thread.Sleep(2500);
}
}
private void RandomButtonTwo()
{
while (1 == 1)
{
RandomCharacter(cmdTwo);
Thread.Sleep(2400);
}
}
private void RandomButtonThree()
{
while (1 == 1)
{
RandomCharacter(cmdThree);
Thread.Sleep(2100);
}
}
private void RandomButtonFour()
{
while (1 == 1)
{
RandomCharacter(cmdFour);
Thread.Sleep(2300);
}
}
private void RandomCharacter(Button cmd)
{
Random ran = new Random(Guid.NewGuid().GetHashCode());
//alphabet_index = ran.Next(0, 25);
char[] alphabet = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'x', 'y', 'z' };
UpdateButtonText(cmd, alphabet[alphabet_index]);
alphabet_index += 1;
if (alphabet_index > 24) alphabet_index = 0;
}
private void timer1_Tick_1(object sender, EventArgs e)
{
labelWord.Location = new Point(labelWord.Location.X + 5, labelWord.Location.Y);
if (labelWord.Location.X > this.Width)
{
labelWord.Location = new Point(0 - labelWord.Width, labelWord.Location.Y);
}
}
private void cmdOne_Click(object sender, EventArgs e)
{
MatchLetters(cmdOne.Text.ToString()[0]);
}
private void cmdTwo_Click(object sender, EventArgs e)
{
MatchLetters(cmdTwo.Text.ToString()[0]);
}
private void cmdThree_Click(object sender, EventArgs e)
{
MatchLetters(cmdThree.Text.ToString()[0]);
}
private void cmdFour_Click(object sender, EventArgs e)
{
MatchLetters(cmdFour.Text.ToString()[0]);
}
}
}
