/// <summary>
/// Purpose: to clear the values in both text boxes and return the focus
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void BtnClear_Click(object sender, EventArgs e)
{
TxtDiameter.Clear();
TxtTurns.Clear();
TxtDiameter.Focus();
return;
}
/// <summary>
/// Purpose: on key press enter, it will find out how many turns of the wheel it takes to make a mile
/// </summary>
/// <param name="sender">txtBdDiameter_KeyPress</param>
/// <param name="e">not used</param>
private void TxtBoxDiameter_KeyPress(object sender, KeyPressEventArgs e)
{
#region Variables
double _circumfrance = 0.0;
double _diameter = 0.0;
double _wheelTurns = 0.0;
#endregion Variables
if (e.KeyChar == (char)Keys.Enter)
{
// 1) on enter stroke read data entered, store in _diameter
double.TryParse(TxtDiameter.Text, out _diameter);
if (_diameter <= 0) // some simple error correction
{
MessageBox.Show("That is an invalad entry, try again.");
TxtDiameter.Clear();
TxtTurns.Clear();
TxtDiameter.Focus();
return;
}
// 2) circumfrance = pi * diameter
_circumfrance = Math.PI * _diameter;
// 3) wheelTurns = mile / circumfrance
_wheelTurns = MILE_INCHES / _circumfrance;
// 4) display wheel turns in txtBxTurns
TxtTurns.Text = string.Format("{0:f3}", _wheelTurns);
}
}