private void TextBox_TextChanged(object sender, TextChangedEventArgs e)
{
if (drawer == null)
{
return;
}
if (editboxes.ContainsKey((sender as TextBox)))
{
editboxes.Remove((sender as TextBox));
}
editboxes.Add((sender as TextBox), (sender as TextBox).Text);
Dictionary <TextBox, String> .Enumerator iterator = editboxes.GetEnumerator();
List <FormulaPart> formulae = new List <FormulaPart>();
try
{
while (iterator.MoveNext())
{
formulae.Add(FormulaPart.ProcessString(iterator.Current.Value));
}
}
catch (ArgumentException ex)
{
Title = ex.Message;
}
drawer.Formulae = formulae;
ReDrawGraph();
}
protected virtual void ParseFormulaVerse()
{
var value = StringUtils.GetStringLastNumber(FormulaPart);
if (!value.HasValue)
{
if (FormulaPart.Length == 1) // только "X"
{
Deviation = 0;
}
else
{
ThrowUnsupportedFormulaException("x004");
}
}
else
{
Deviation = value.Value;
}
if (FormulaPart.IndexOf("+") == -1)
{
Deviation *= -1;
}
}
public void DrawPopup(Vector2 point)
{
Vector2 graph_coords = TranslatePointToVector(point);
FormulaPart closestgraph = null;
double closestvalue = double.PositiveInfinity;
double closestvalue_dx = double.PositiveInfinity;
List <Tuple <string, double> > variables = new List <Tuple <string, double> >();
variables.Add(new Tuple <string, double>("x", graph_coords.X));
List <Tuple <string, double> > variables_prime = new List <Tuple <string, double> >();
variables_prime.Add(new Tuple <string, double>("x", graph_coords.X + 1e-6));
foreach (FormulaPart formula in Formulae)
{
double answer = formula.Evaluate(variables);
if (Math.Abs(answer - graph_coords.Y) < Math.Abs(closestvalue - graph_coords.Y))
{
closestvalue = answer;
closestvalue_dx = formula.Evaluate(variables_prime);
closestgraph = formula;
}
}
if (closestgraph == null)
{
return;
}
Ellipse dot = new Ellipse();
dot.Width = 6;
dot.Height = 6;
dot.StrokeThickness = 2;
dot.Stroke = new SolidColorBrush(Colors.Blue);
Vector2 canvaspoint = TranslateCoordsToCanvas(graph_coords.X, closestvalue);
Canvas.SetLeft(dot, canvaspoint.X);
Canvas.SetTop(dot, canvaspoint.Y);
Canvas.SetZIndex(dot, 10);
canvas.Children.Add(dot);
Rectangle rect = new Rectangle();
rect.Width = 100;
rect.Height = 100;
rect.Fill = new SolidColorBrush(Colors.SteelBlue);
rect.StrokeThickness = 4;
rect.Stroke = new SolidColorBrush(Colors.Blue);
Canvas.SetLeft(rect, 10);
Canvas.SetTop(rect, 10);
canvas.Children.Add(rect);
canvas.Children.Add(
CreateText(new Vector2(20, 20), "Trace:")
);
canvas.Children.Add(
CreateText(new Vector2(20, 30), "X : " + graph_coords.X)
);
canvas.Children.Add(
CreateText(new Vector2(20, 40), "f(X) : " + closestvalue)
);
canvas.Children.Add(
CreateText(new Vector2(20, 50), "f(X)' : " + (closestvalue_dx - closestvalue) / 1e-6)
);
}
