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Copy pathMainWindow.xaml.cs
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663 lines (581 loc) · 21.8 KB
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Windows;
using System.Windows.Controls;
/// <todo>
/// TODO - Fix Factorial - shows infinity for high values
/// TODO - Type into text box
/// TODO - Add exponential notation
/// </todo>
namespace Calculator
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
// Max digits to be shown in the memory label, does not affect the actual number stored in memory
const int maxMemoryLabelLength = 6;
// Default font result box font size
const int defaultFontSize = 48;
// True if there is an on going math operation
bool operationCheck;
// True if a function (sin, tan, ln, log etc) was called on the number during another mathematical operation
bool functionCheck;
// True if the result box is to be cleared when a number is entered
bool clearNext;
// True if the text in the result box is the result of some computation
bool isResult;
// True if the text in the result box has not been changed after clicking an operator
bool isOldText;
// Stores the number in memory accessed via MR
double memory = 0;
// Stores the text in the text box after a new math operation is selected
string previousText;
// Trigonometric modes
enum trigModes
{
STANDARD, // Default mode
HYPERBOLIC,
ARC
}
// Stores the current trigonometric mode
trigModes currentTrigMode;
// Symbols to show on the button for different trig modes
Dictionary<trigModes, string> trigModeSymbols = new Dictionary<trigModes, string>()
{
{ trigModes.STANDARD, "STD" },
{ trigModes.ARC, "ARC" },
{ trigModes.HYPERBOLIC, "HYP" }
};
// Stores the current angle unit, default is radians
Angles.units angleUnit;
// Symbols to show on the button for different angle units
Dictionary<Angles.units, string> angleUnitSymbols = new Dictionary<Angles.units, string>()
{
{ Angles.units.RADIANS, "RAD" },
{ Angles.units.DEGREES, "DEG" },
{ Angles.units.GRADIANS, "GRAD" }
};
// Errors that may occur
static string OVERFLOW = "Overflow";
static string INVALID_INPUT = "Invalid input";
static string NOT_A_NUMBER = "NaN";
string[] errors = { OVERFLOW, INVALID_INPUT, NOT_A_NUMBER };
// Holds the current operation
operations currentOperation = operations.NULL;
// Math operations that take two operands
enum operations
{
ADDITION,
SUBTRACTION,
DIVISION,
MULTIPLICATION,
POWER,
NULL // Represents no operation (used to reset the status)
}
public MainWindow()
{
InitializeComponent();
angle_unit_button.Content = angleUnitSymbols[angleUnit];
trig_mode_button.Content = trigModeSymbols[currentTrigMode];
}
/// <summary>
/// Displays the given text to the result box and sets the value of clearNext to true by default (false if specified).
/// </summary>
private void showText(string text, bool clear=true)
{
try
{
if (double.Parse(text) == 0)
text = "0";
}
catch (Exception)
{
showError(INVALID_INPUT);
return;
}
if (text.Length > 30)
return;
if (text.Length > 12)
resultBox.FontSize = 25;
if (text.Length > 24)
resultBox.FontSize = 20;
clearNext = clear;
resultBox.Text = text;
}
/// <summary>
/// Displays the given text in the result box.
/// </summary>
private void showError(string text)
{
resultBox.Text = text;
previousText = null;
operationCheck = false;
clearNext = true;
updateEquationBox("");
currentOperation = operations.NULL;
resetFontSize();
}
/// <summary>
/// Updates the equation box with the given equation string.
/// If append is true then the given text is appended to the existing text in the equation box.
/// </summary>
private void updateEquationBox(string equation, bool append=false)
{
// Removes pointless decimals from the numbers in the equation
equation = Regex.Replace(equation, @"(\d+)\.\s", "$1 ");
if (equation.Length > 10)
equationBox.FontSize = 18;
if (!append)
equationBox.Text = equation;
else
equationBox.Text += equation;
}
/// <summary>
/// Updates the memory label text with the value in memory variable.
/// </summary>
private void updateMemoryLabel()
{
memoryLabel.Content = memory.ToString();
if (memoryLabel.Content.ToString().Length > maxMemoryLabelLength)
memoryLabel.Content = memoryLabel.Content.ToString().Substring(0, 5) + "...";
}
/// <summary>
/// Parses the text in the text box into a double datatype and returns it.
/// </summary>
private double getNumber()
{
double number = double.Parse(resultBox.Text);
return number;
}
/// <summary>
/// Resets the result box font size to defaultSize
/// </summary>
private void resetFontSize()
{
resultBox.FontSize = defaultFontSize;
}
/// <summary>
/// Calculates the result by solving the previousText and current text in the result
/// box with the operand in currentOperation.
/// </summary>
private void calculateResult()
{
if (currentOperation == operations.NULL)
return;
double a = double.Parse(previousText); // first operand
double b = double.Parse(resultBox.Text); // second operand
double result;
switch(currentOperation)
{
case operations.DIVISION:
result = a / b;
break;
case operations.MULTIPLICATION:
result = a * b;
break;
case operations.ADDITION:
result = a + b;
break;
case operations.SUBTRACTION:
result = a - b;
break;
case operations.POWER:
result = Math.Pow(a, b);
break;
default:
return;
}
if (errors.Contains(resultBox.Text))
return;
operationCheck = false;
previousText = null;
string equation;
// If a function button was not clicked during a mathematical operation then the equation box will have the text with the
// format <operand a> <operation> <operand b as a number> else <operand a> <operation> <func>(<operand b>)
if (!functionCheck)
equation = equationBox.Text + b.ToString();
else
{
equation = equationBox.Text;
functionCheck = false;
}
updateEquationBox(equation);
showText(result.ToString());
currentOperation = operations.NULL;
isResult = true;
}
/// <summary>
/// Appends the digit clicked to the text in the text box.
/// If an ongoing operation has been selected then the text box value is first assigned to previousText variable and then new text
/// is appended to the text box after truncating the previous text.
/// </summary>
private void numberClick(object sender, RoutedEventArgs e)
{
isResult = false;
Button button = (Button)sender;
if (resultBox.Text == "0" || errors.Contains(resultBox.Text))
resultBox.Clear();
string text;
if (clearNext)
{
resetFontSize();
text = button.Content.ToString();
isOldText = false;
}
else
text = resultBox.Text + button.Content.ToString();
if (!operationCheck && equationBox.Text != "")
updateEquationBox("");
showText(text, false);
}
/// <summary>
/// Changes the current angle unit.
/// </summary>
private void angle_unit_button_Click(object sender, RoutedEventArgs e)
{
List<Angles.units> units = new List<Angles.units>()
{
Angles.units.RADIANS,
Angles.units.DEGREES,
Angles.units.GRADIANS
};
Button button = (Button)sender;
angleUnit = units.ElementAtOrDefault(units.IndexOf(angleUnit) + 1);
button.Content = angleUnitSymbols[angleUnit];
}
/// <summary>
/// Changes the trigonometric functions mode to Normal, Hyperbolic or Arc
/// </summary>
private void trig_mode_button_Click(object sender, RoutedEventArgs e)
{
List<trigModes> modes = new List<trigModes>()
{
trigModes.STANDARD,
trigModes.ARC,
trigModes.HYPERBOLIC
};
Button button = (Button)sender;
currentTrigMode = modes.ElementAtOrDefault(modes.IndexOf(currentTrigMode) + 1);
button.Content = trigModeSymbols[currentTrigMode];
if (currentTrigMode == trigModes.STANDARD)
{
sin_button.Content = "sin";
cos_button.Content = "cos";
tan_button.Content = "tan";
}
if (currentTrigMode == trigModes.HYPERBOLIC)
{
sin_button.Content = "sinh";
cos_button.Content = "cosh";
tan_button.Content = "tanh";
}
if (currentTrigMode == trigModes.ARC)
{
sin_button.Content = "asin";
cos_button.Content = "acos";
tan_button.Content = "atan";
}
}
/// <summary>
/// Deals with function button clicks.
/// </summary>
private void function(object sender, RoutedEventArgs e)
{
if (errors.Contains(resultBox.Text))
return;
Button button = (Button)sender;
string buttonText = button.Content.ToString();
double number = getNumber();
string equation = "";
string result = "";
switch (buttonText)
{
case "!":
if (number < 0 || number.ToString().Contains("."))
{
showError(INVALID_INPUT);
return;
}
if (number > 3248) // chose this number because the default windows calculator doesn't go beyond this number
{
showError(OVERFLOW);
return;
}
double res = 1;
if (number == 1 || number == 0)
result = res.ToString();
else
{
for (int i = 2; i <= number; i++)
{
res *= i;
}
}
equation = "fact(" + number.ToString() + ")";
result = res.ToString();
break;
case "ln":
equation = "ln(" + number + ")";
result = Math.Log(number).ToString();
break;
case "log":
equation = "log(" + number + ")";
result = Math.Log10(number).ToString();
break;
case "√":
equation = "√(" + number + ")";
result = Math.Sqrt(number).ToString();
break;
case "-n":
equation = "negate(" + number + ")";
result = decimal.Negate((decimal)number).ToString();
break;
}
if (operationCheck)
{
equation = equationBox.Text + equation;
functionCheck = true;
}
updateEquationBox(equation);
showText(result);
}
/// <summary>
/// Deals with trigonometric function button clicks.
/// </summary>
private void trigFunction(object sender, RoutedEventArgs e)
{
if (errors.Contains(resultBox.Text))
return;
Button button = (Button)sender;
string buttonText = button.Content.ToString();
string equation = "";
string result = "";
double number = getNumber();
switch (currentTrigMode)
{
// Standard trig functions
case trigModes.STANDARD:
double radianAngle = Angles.Converter.radians(number, angleUnit);
switch (buttonText)
{
case "sin":
equation = "sin(" + number.ToString() + ")";
result = Math.Sin(radianAngle).ToString();
break;
case "cos":
equation = "cos(" + number.ToString() + ")";
result = Math.Cos(radianAngle).ToString();
break;
case "tan":
equation = "tan(" + number.ToString() + ")";
result = Math.Tan(radianAngle).ToString();
break;
}
break;
// Hyperbolic trig functions
case trigModes.HYPERBOLIC:
switch(buttonText)
{
case "sinh":
equation = "sinh(" + number + ")";
result = Math.Sinh(number).ToString();
break;
case "cosh":
equation = "cosh(" + number + ")";
result = Math.Cosh(number).ToString();
break;
case "tanh":
equation = "tanh(" + number + ")";
result = Math.Tanh(number).ToString();
break;
}
break;
// Arc trig functions
case trigModes.ARC:
switch (buttonText)
{
case "asin":
equation = "asin(" + number + ")";
result = Math.Asin(number).ToString();
break;
case "acos":
equation = "acos(" + number + ")";
result = Math.Acos(number).ToString();
break;
case "atan":
equation = "atan(" + number + ")";
result = Math.Atan(number).ToString();
break;
}
break;
}
// We need to convert the result to the given angle unit if arc trig functions are used
if (currentTrigMode == trigModes.ARC)
{
switch(angleUnit)
{
case Angles.units.DEGREES:
result = Angles.Converter.degrees(double.Parse(result), Angles.units.RADIANS).ToString();
break;
case Angles.units.GRADIANS:
result = Angles.Converter.gradians(double.Parse(result), Angles.units.RADIANS).ToString();
break;
default: // 'result' is in radians by default
break;
}
}
if (operationCheck)
{
equation = equationBox.Text + equation;
functionCheck = true;
}
updateEquationBox(equation);
showText(result);
}
/// <summary>
/// Deals with double operand function clicks.
/// </summary>
private void doubleOperandFunction(object sender, RoutedEventArgs e)
{
if (errors.Contains(resultBox.Text))
return;
if (operationCheck && !isOldText)
calculateResult();
Button button = (Button)sender;
operationCheck = true;
previousText = resultBox.Text;
string buttonText = button.Content.ToString();
string equation = previousText + " " + buttonText + " ";
switch(buttonText)
{
case "/":
currentOperation = operations.DIVISION;
break;
case "x":
currentOperation = operations.MULTIPLICATION;
break;
case "-":
currentOperation = operations.SUBTRACTION;
break;
case "+":
currentOperation = operations.ADDITION;
break;
case "^":
currentOperation = operations.POWER;
break;
}
updateEquationBox(equation);
resetFontSize();
showText(resultBox.Text);
isOldText = true;
}
/// <summary>
/// Appends a decimal point to the number in the result box on click,
/// if the number already has a decimal point then no action is taken
/// </summary>
private void decimal_button_Click(object sender, RoutedEventArgs e)
{
if (!resultBox.Text.Contains("."))
{
string text = resultBox.Text += ".";
showText(text, false);
}
}
private void pi_button_Click(object sender, RoutedEventArgs e)
{
if (!operationCheck)
updateEquationBox("");
showText(Math.PI.ToString());
isResult = true; // Constants cannot be changed
}
private void e_button_Click(object sender, RoutedEventArgs e)
{
if (!operationCheck)
updateEquationBox("");
showText(Math.E.ToString());
isResult = true; // Constants cannot be changed
}
private void madd_button_Click(object sender, RoutedEventArgs e)
{
if (errors.Contains(resultBox.Text))
return;
memory += getNumber();
updateMemoryLabel();
}
private void msub_button_Click(object sender, RoutedEventArgs e)
{
if (errors.Contains(resultBox.Text))
return;
memory -= getNumber();
updateMemoryLabel();
}
private void mc_button_Click(object sender, RoutedEventArgs e)
{
memory = 0;
updateMemoryLabel();
}
private void mr_button_Click(object sender, RoutedEventArgs e)
{
showText(memory.ToString());
if (!operationCheck)
updateEquationBox("");
}
private void clear_button_Click(object sender, RoutedEventArgs e)
{
resultBox.Text = "0";
operationCheck = false;
previousText = null;
updateEquationBox("");
resetFontSize();
}
private void clr_entry_button_Click(object sender, RoutedEventArgs e)
{
resultBox.Text = "0";
resetFontSize();
}
private void equals_button_Click(object sender, RoutedEventArgs e)
{
calculateResult();
}
private void about_button_Click(object sender, RoutedEventArgs e)
{
AboutBox aboutForm = new AboutBox();
aboutForm.ShowDialog();
}
// Copy
private void copy_button_Click(object sender, RoutedEventArgs e)
{
if (errors.Contains(resultBox.Text))
return;
Clipboard.SetData(DataFormats.UnicodeText, resultBox.Text);
}
// Paste
private void paste_button_Click(object sender, RoutedEventArgs e)
{
object clipboardData = Clipboard.GetData(DataFormats.UnicodeText);
if (clipboardData != null)
{
string data = clipboardData.ToString();
showText(data.ToString());
}
else
return;
}
private void back_button_Click(object sender, RoutedEventArgs e)
{
if (isResult)
return;
string text;
if (resultBox.Text.Length == 1)
text = "0";
else
text = resultBox.Text.Substring(0, resultBox.Text.Length - 1);
showText(text, false);
}
}
}
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