private void LoadTableFromXML()
{
OpenFileDialog openDlg = new OpenFileDialog();
openDlg.Filter = "XML | *.xml";
if (openDlg.ShowDialog() == true)
{
try
{
Lp = LagrangePolynom.ReadFromXML(openDlg.FileName);
}
catch (InvalidOperationException)
{
MessageBox.Show("Invalid XML file!", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
return;
}
Gx = new ExprTree.Expression(Lp.ToString(), "x");
this.FileName = openDlg.FileName;
//show the values in the point grid
pointsDt.Clear();
foreach (Point p in Lp.GetPointCollection())
{
DataRow newRow = pointsDt.NewRow();
newRow["X"] = p.X;
newRow["Y"] = p.Y;
pointsDt.Rows.Add(newRow);
}
pointGrid.DataContext = pointsDt;
pointGrid.UpdateLayout();
}
}
private Point[] GeneratePoints(double from, double to, int pointsCount)
{
ExprTree.Expression expr = new ExprTree.Expression(lblFunc.Content.ToString(), "x");
Func <double, double> f = expr.CompileDynamicMethod();
//generate points array
Point[] pointsToXML = new Point[pointsCount];
for (int i = 1; i <= pointsCount; i++)
{
//Chebyshev points
double Xi = 0.5 * (from + to) + 0.5 * (to - from) * Math.Cos((2.0 * i - 1) / (2.0 * pointsToXML.Length) * Math.PI);
pointsToXML[pointsCount - i] = new Point(Xi, f(Xi));
}
return(pointsToXML);
}
private async void ButtonFindRoots_Click(object sender, RoutedEventArgs e)
{
try
{
if (Lp == null)
{
throw new NullReferenceException("Interpolation points were not loaded!");
}
//Fx = new ExprTree.Expression(txtFx.Text, "x"); //it is compiled after it's input in txtFx_LostKeybFocus
//Gx = new ExprTree.Expression(Lp.ToString(), "x");
ExprTree.Expression Zx = Fx - Gx; //solve for f(x)=(gx) => f(x)-g(x)=0
CheckRootFindInterval();
StartRootsCalc(this, EventArgs.Empty);
this.roots = await Zx.FindRootsBruteAsync(this.rootFindInterval.Value.From, this.rootFindInterval.Value.To, 1e-5, this.eps);
if (this.RootsCalculated != null)
{
RootsCalculated(this, EventArgs.Empty);
}
}
catch (NullReferenceException ex)
{
if (ex.Message == "Interpolation points were not loaded!")
{
pointGrid.BorderBrush = new SolidColorBrush(Colors.Red);
}
else
{
throw;
}
}
catch (Exception ex)
{
txtFx.BorderBrush = new SolidColorBrush(Colors.Red);
MessageBox.Show(ex.Message);
}
}
private void MenuConvertFuncToXML_Click(object sender, RoutedEventArgs e)
{
try
{
ExprTree.Expression expr = new ExprTree.Expression(txtFx.Text, "x");
}
catch (Exception)
{
MessageBox.Show("Input function is incorrect!");
txtFx.BorderBrush = new SolidColorBrush(Colors.Red);
txtFx.SelectAll();
return;
}
txtFx.BorderBrush = new SolidColorBrush(Colors.Green);
//converts F(x) to xml format
FunctionConvertXMLWindow convertWnd = new FunctionConvertXMLWindow();
convertWnd.WindowStartupLocation = System.Windows.WindowStartupLocation.CenterOwner;
convertWnd.Owner = this;
convertWnd.Show();
}
