//Dictionary<double, double> zz = new Dictionary<double, double>();
//private double aaa;
//private double bbb;
//private double aaaY;
//private double bbbY;
private bool TryGetPointAt(IOperation operation, double screenX, out int value)
{
value = -1;
var x = FunctionCalc.GetXFromScreenX(screenX);
var result = FunctionCalc.GetYFromX(operation, x);
if (double.IsNaN(result) || double.IsInfinity(result))
{
return(false);
}
result = FunctionCalc.GetScreenYFromY(result);
//if (result > Height)
// result = Height;
//if (result < -1)
// result = -1;
result = MinMax(result, -1, Height);
value = (int)result;
//if (value >= 0 && value < Height)
{
return(true);
}
//return false;
}
private void DrawCoordinateSystem(Graphics graphics)
{
const int borderSpace = 10;
var pen = new Pen(Color.Blue);
var brush = new SolidBrush(Color.Blue);
var font = new Form().Font;
// vertical line
var lineX = MinMax(
(int)FunctionCalc.GetScreenXFromX(0),
borderSpace * 2,
Width - borderSpace * 2);
graphics.DrawLines(pen, GetLineWithArrow(lineX, borderSpace, lineX, Height - borderSpace));
foreach (var y in GetLabelPoints(FunctionCalc.Scale.Y, FunctionCalc.GetYFromScreenY(Height - borderSpace),
borderSpace, FunctionCalc.GetScreenYFromY))
{
graphics.DrawLine(pen,
lineX - 2, (int)y,
lineX + 2, (int)y);
var value = (float)FunctionCalc.GetYFromScreenY(y);
if (Math.Abs(value) > 1e-12)
{
graphics.DrawString(value.ToString(CultureInfo.InvariantCulture),
font, brush, lineX + 5, (int)y - 4);
}
}
// horizontal line
var lineY = MinMax(
(int)FunctionCalc.GetScreenYFromY(0),
borderSpace * 2,
Height - borderSpace * 2);
graphics.DrawLines(pen, GetLineWithArrow(borderSpace, lineY, Width - borderSpace, lineY));
foreach (var x in GetLabelPoints(FunctionCalc.Scale.X, FunctionCalc.GetXFromScreenX(borderSpace),
Width - borderSpace, FunctionCalc.GetScreenXFromX))
{
graphics.DrawLine(pen,
(int)x, lineY - 2,
(int)x, lineY + 2);
var value = (float)FunctionCalc.GetXFromScreenX(x);
if (Math.Abs(value) > 1e-12)
{
graphics.DrawString(value.ToString(CultureInfo.InvariantCulture),
font, brush, (int)x - 4, lineY + 5);
}
else
{
if (Math.Abs(value) > 0)
{
}
}
}
}