private void txt_input_TextChanged(object sender, EventArgs e)
{
try
{
ExpressionTree tree = new ExpressionTree(txt_input.Text);
txt_derivative.Text = tree.GetDerivative().GetInFixNotation();
DisplayGraphic();
this.pbox_standard.Image = tree.Render();
this.pbox_derivative.Image = tree.GetDerivative().Render();
}
catch {
}
}
private void button1_Click_1(object sender, EventArgs e)
{
ExpressionTree tree = new ExpressionTree(txt_input.Text);
txt_derivative.Text = tree.GetDerivative().GetInFixNotation();
}
public static Bitmap Draw(ExpressionTree function, double zoom, double cameraX, double cameraY, double width = 300, double height = 300)
{
Bitmap graphic = new Bitmap((int)width, (int)height);
Graphics g = Graphics.FromImage(graphic);
g.FillRectangle(new SolidBrush(Color.Gray), 0, 0, (int)width, (int)height);
double graphWidth = (double)width / zoom;
double graphHeight = (double)height / zoom;
List <PointF> functionPoints = new List <PointF>();
for (double sampler = cameraX - graphWidth / 2; sampler <= cameraX + graphWidth / 2; sampler += 0.5)
{
try
{
functionPoints.Add(new PointF(
(float)sampler - (float)cameraX + (float)graphWidth / 2,
(float)Math.Min(height + 50, Math.Max(-50,
((float)graphHeight - ((float)function.Evaluate(
new Dictionary <string, double>()
{
{ "x", sampler }
}) + (float)graphHeight / 2 + cameraY))))));
}
catch {
}
}
List <PointF> derivativePoints = new List <PointF>();
var derivative = function.GetDerivative();
for (double sampler = cameraX - graphWidth / 2; sampler <= cameraX + graphWidth / 2; sampler += 0.6)
{
try
{
derivativePoints.Add(new PointF(
(float)sampler - (float)cameraX + (float)graphWidth / 2,
(float)Math.Min(height + 50, Math.Max(-50,
((float)graphHeight - ((float)derivative.Evaluate(
new Dictionary <string, double>()
{
{ "x", sampler }
}) + (float)graphHeight / 2 + cameraY))))));
}
catch
{
}
}
g.DrawCurve(new Pen(Color.Red, 2), functionPoints.ToArray());
g.DrawCurve(new Pen(Color.Blue, 2), derivativePoints.ToArray());
g.DrawLine(
new Pen(Color.Black, 2),
new Point((int)(graphWidth / 2 - cameraX), 0),
new Point((int)(graphWidth / 2 - cameraX), (int)height - 1));
g.DrawLine(
new Pen(Color.Black, 2),
new Point(0, (int)(graphHeight / 2 - cameraY)),
new Point((int)width - 1, (int)(graphHeight / 2 - cameraY)));
g.Dispose();
return(graphic);
}