private void button2_Click(object sender, EventArgs e)
{
var funcs = new ChartFunction.MathFunction[] { Math.Sin, Math.Tan, Math.Ceiling, Math.Cos, Math.Atan };
var fobj = new ChartFunction(chart1, funcs[rand.Next(funcs.Length)], Color.Black);
// var fobj = new ChartFunction(chart1, Math.Ceiling, Color.Black);
fobj.ExtendOnExtremum = true;
fobj.Color = Color.Red;
chart1.AddObject(fobj);
}
/// <summary>
/// Plots a function defined by a lambda inside the provided interval.
/// </summary>
/// <param name="function">The function to plot.</param>
/// <param name="minX">The left bound of the interval.</param>
/// <param name="maxX">The right bound of the interval.</param>
/// <param name="functionColor">The color of the plot.</param>
/// <param name="step">The sample step. Default will compute f(x) on each pixel.</param>
public static void PushFunction(ChartFunction function, float minX, float maxX,
Color functionColor, float step = -1f)
{
if (minX < CurrentChart.minX)
{
minX = CurrentChart.minX;
}
if (maxX > CurrentChart.maxX)
{
maxX = CurrentChart.maxX;
}
// Computes the default step value.
if (step < 0)
{
step = CurrentChart.userDefinedRect.width / CurrentChart.pixelSizeRect.width;
}
List <Vector2> samples = new List <Vector2>();
bool aboveLimit = false, belowLimit = false;
Vector2 previous = Vector2.zero;
Vector2 current = Vector2.zero;
for (float x = minX; x < maxX; x += step)
{
current = new Vector2(x, function(x));
if (current.y > CurrentChart.maxY)
{
// Case 1: point is above Y bound
if (!aboveLimit)
{
Vector2 intersection = GetIntersectionPointCoordinates(current, previous,
new Vector2(minX, CurrentChart.maxY), new Vector2(maxX,
CurrentChart.maxY), out bool found);
aboveLimit = true;
if (found)
{
samples.Add(intersection);
}
PushLineChart(samples.ToArray(), functionColor);
samples.Clear();
}
}
else if (current.y < CurrentChart.minY)
{
// Case 2: point is below Y bound
if (!belowLimit)
{
Vector2 intersection = GetIntersectionPointCoordinates(current, previous,
new Vector2(minX, CurrentChart.minY), new Vector2(maxX, CurrentChart.minY),
out bool found);
belowLimit = true;
if (found)
{
samples.Add(intersection);
}
PushLineChart(samples.ToArray(), functionColor);
samples.Clear();
}
}
else
{
// Case 3: point is inside bounds
if (aboveLimit)
{
Vector2 intersection = GetIntersectionPointCoordinates(current, previous,
new Vector2(minX, CurrentChart.maxY), new Vector2(maxX, CurrentChart.maxY),
out bool found);
aboveLimit = false;
if (found)
{
samples.Add(intersection);
}
}
if (belowLimit)
{
Vector2 intersection = GetIntersectionPointCoordinates(current, previous,
new Vector2(minX, CurrentChart.minY), new Vector2(maxX, CurrentChart.minY),
out bool found);
belowLimit = false;
if (found)
{
samples.Add(intersection);
}
}
samples.Add(current);
}
previous = current;
}
PushLineChart(samples.ToArray(), functionColor);
}
