public static void Main()
{
var settings = new PlotSettings
{
Curves = new List <Curve>(),
Viewport = new Viewport
{
XMin = -2 * Math.PI,
XMax = 2 * Math.PI,
YMin = -5,
YMax = 5
},
Height = 500,
Width = 800,
StepX = 0.01,
DrawXAxis = true,
DrawYAxis = true
};
var layout = new Layout(settings);
layout.AppendTo(Document.Body);
}
public TinyPlotter(PlotSettings settings)
{
Settings = settings;
Canvas = new HTMLCanvasElement();
Canvas.Height = Settings.Height;
Canvas.Width = Settings.Width;
Canvas.Style.Border = "1px solid black";
var ctx = Canvas.GetContext(CanvasTypes.CanvasContext2DType.CanvasRenderingContext2D);
var image = ctx.CreateImageData(Canvas.Width, Canvas.Height);
if (Settings.DrawXAxis)
{
DrawXAxis(image);
}
if (Settings.DrawXAxis)
{
DrawYAxis(image);
}
ctx.PutImageData(image, 0, 0);
}
public Layout(PlotSettings settings)
{
var plotter = new TinyPlotter(settings);
var exprInput = new HTMLInputElement {
Type = InputType.Text
};
exprInput.Value = "sin(3x)";
var evalInput = new HTMLInputElement {
Type = InputType.Text
};
evalInput.Value = "plus(5^2, sin(div(pi, 2)))";
var variableInput = new HTMLInputElement {
Type = InputType.Text
};
variableInput.Value = "x";
var deltaXInput = new HTMLInputElement {
Type = InputType.Text
};
deltaXInput.Value = "0.005";
var xminInput = new HTMLInputElement {
Type = InputType.Text
};
xminInput.Value = settings.Viewport.XMin.ToString();
var xmaxInput = new HTMLInputElement {
Type = InputType.Text
};
xmaxInput.Value = settings.Viewport.XMax.ToString();
var yminInput = new HTMLInputElement {
Type = InputType.Text
};
yminInput.Value = settings.Viewport.YMin.ToString();
var ymaxInput = new HTMLInputElement {
Type = InputType.Text
};
ymaxInput.Value = settings.Viewport.YMax.ToString();
var resultDiv = new HTMLDivElement();
resultDiv.Style.FontSize = "18px";
resultDiv.Style.MaxWidth = "300px";
var btnPlot = new HTMLButtonElement
{
InnerHTML = "Plot with derivative",
OnClick = ev =>
{
Func <HTMLInputElement, bool> IsNaN = x => double.IsNaN(Script.ParseFloat(x.Value));
var isNotValid = exprInput.Value == "" ||
variableInput.Value == "" ||
IsNaN(deltaXInput) ||
IsNaN(xminInput) ||
IsNaN(xmaxInput) ||
IsNaN(yminInput) ||
IsNaN(ymaxInput);
if (isNotValid)
{
Write("<h1 style='color:red'>Input is not valid!</h1>", resultDiv);
return;
}
var result = Parser.TryParseInput(exprInput.Value);
if (result.WasSuccessful)
{
// set the settings
plotter.Settings.StepX = Script.ParseFloat(deltaXInput.Value);
plotter.Settings.Viewport.XMin = Script.ParseFloat(xminInput.Value);
plotter.Settings.Viewport.XMax = Script.ParseFloat(xmaxInput.Value);
plotter.Settings.Viewport.YMin = Script.ParseFloat(yminInput.Value);
plotter.Settings.Viewport.YMax = Script.ParseFloat(ymaxInput.Value);
resultDiv.InnerHTML = "";
var f = result.Value;
var df = Expr.Differentiate(f, variableInput.Value);
var fLambda = Expr.Lambdify(f, variableInput.Value);
var dfLambda = Expr.Lambdify(df, variableInput.Value);
var curveColor = RandomColor();
plotter.Settings.Curves.Clear();
plotter.Settings.Curves.Add(new Curve {
Map = fLambda, Color = curveColor
});
plotter.Settings.Curves.Add(new Curve {
Map = dfLambda, Color = Grayscale(curveColor)
});
plotter.Draw();
var rgbCurveColor = RGB(curveColor);
var rgbGrayColor = RGB(Grayscale(curveColor));
var msgParsed = "<strong style='color:" + rgbCurveColor + "'>" + f.ToString() + "</strong>";
var derivative = "<strong style='color:" + rgbGrayColor + "'>" + df.ToString() + "</strong>";
Write("<hr /> Parsed: <br />" + msgParsed + "<br /> Derivative: <br /> " + derivative + "<hr />", resultDiv);
}
else
{
var error = string.Join("<br />", result.Expectations);
Write("<h1 style='color:red'>" + error + "</h1>", resultDiv);
}
}
};
var btnEvaluate = new HTMLButtonElement
{
InnerHTML = "Evaluate",
OnClick = ev =>
{
if (evalInput.Value == "")
{
Write("<h1 style='color:red'>Input is not valid!</h1>", resultDiv);
return;
}
var result = Parser.TryParseInput(evalInput.Value);
if (result.WasSuccessful)
{
resultDiv.InnerHTML = "";
var expression = result.Value;
var eval = Expr.Evaluate(expression);
Write("<h4 style='color:green'>" +
"Parsed: " + expression.ToString() + "<br />" +
"Answer: " + eval.ToString()
+ "</h4>", resultDiv);
}
else
{
var error = string.Join("<br />", result.Expectations);
Write("<h1 style='color:red'>" + error + "</h1>", resultDiv);
}
}
};
var slider = new HTMLInputElement {
Type = InputType.Range
};
btnEvaluate.Style.Width = "90%";
btnEvaluate.Style.Margin = "5px";
btnEvaluate.Style.Height = "40px";
btnPlot.Style.Margin = "5px";
btnPlot.Style.Height = "40px";
btnPlot.Style.Width = "90%";
var layout = Table(
Row(Table(
Row(Label("Expression"), exprInput),
Row(Label("Variable"), variableInput),
Row(Label("XAxis step"), deltaXInput),
Row(Label("XMin"), xminInput),
Row(Label("XMax"), xmaxInput),
Row(Label("YMin"), yminInput),
Row(Label("YMax"), ymaxInput),
Row(btnPlot, 2),
Row(new HTMLHRElement(), 2),
Row(Label("Expression"), evalInput),
Row(btnEvaluate, 2),
Row(resultDiv, 2)),
Table(
Row(plotter.Canvas)))
);
this.container = layout;
}
