/// <summary>
/// Removes the last expression component from the expresssion
/// </summary>
/// <param name="displayString">The string bound to the string displayed in the ui</param>
public void Delete(DisplayString displayString)
{
if (expressionString.Length != 0)
{
switch (expressionString[expressionString.Length - 1])
{
case ')':
parenOpenCount++;
break;
case '(':
parenOpenCount--;
//check for sin, cos, tan, sqrt and delete more characters is detected
if (expressionString.Length > 2)
{
switch (expressionString[expressionString.Length - 2])
{
case 'n': //sin and tan
case 's': //cos
expressionString.Remove(expressionString.Length - 3, 3);
break;
case 't': //sqrt
expressionString.Remove(expressionString.Length - 4, 4);
break;
}
}
break;
case '\uDF0B': //pi Technically 2 characters in ascii
expressionString.Remove(expressionString.Length - 1, 1);
break;
}
expressionString.Remove(expressionString.Length - 1, 1);
}
displayString.Display = expressionString.ToString();
}
public MainWindow()
{
InitializeComponent();
expressionCharGroups = new Dictionary <ExpressionComponent, ButtonGroup>();
errorDisplay = new DisplayString();
inputDisplay = new DisplayString();
outputDisplay = new DisplayString();
inputExpression = new Expression(inputDisplay);
//Create dictionary of sets of buttons
expressionCharGroups.Add(ExpressionComponent.Constants, new ButtonGroup(new Button[] { btnE, btnPi }));
expressionCharGroups.Add(ExpressionComponent.Digits, new ButtonGroup(new Button[] { btn0, btn1, btn2, btn3, btn4, btn5, btn6, btn7, btn8, btn9 }));
expressionCharGroups.Add(ExpressionComponent.Decimal, new ButtonGroup(new Button[] { btnDecimal }));
expressionCharGroups.Add(ExpressionComponent.Minus, new ButtonGroup(new Button[] { btnMinus }));
expressionCharGroups.Add(ExpressionComponent.Operators, new ButtonGroup(new Button[] { btnPlus, btnMultiply, btnDivide, btnExponent }));
expressionCharGroups.Add(ExpressionComponent.ParenClose, new ButtonGroup(new Button[] { btnParenRight }));
expressionCharGroups.Add(ExpressionComponent.ParenOpen, new ButtonGroup(new Button[] { btnParenLeft, btnSin, btnCos, btnTan, btnSqrt }));
displayError.DataContext = errorDisplay;
displayIn.DataContext = inputDisplay;
displayOut.DataContext = outputDisplay;
SetButtonStateButtons();
}
/// <summary>
/// Clears the expression string
/// </summary>
/// <param name="displayString">The string bound to the string displayed in the ui</param>
public void Clear(DisplayString displayString)
{
expressionString.Clear();
displayString.Display = "";
}
public Expression(DisplayString input)
{
expressionString = new StringBuilder();
this.input = input;
}