public void DrawIntegralFunctionPlot(int width, int height)
{
var points =
_function.GetFunctionGraph(_model.Min, _model.Max, _model.StepSize);
var functionPointsY = points.Select(entry => entry.Y).ToList();
var minY = functionPointsY.Min();
var maxY = functionPointsY.Max();
var integralPoints = _function.GetIntegralPoints(points);
var upperLeftPoints = integralPoints.Select(entry => entry.Item1).ToList();
var lowerRightPoints = integralPoints.Select(entry => entry.Item2).ToList();
var iPointsX = upperLeftPoints.Select(entry => entry.X).ToList();
iPointsX.AddRange(lowerRightPoints.Select(entry => entry.X));
iPointsX = Converters.GetScaledValues(iPointsX, _originOffset, width);
var iPointsY = upperLeftPoints.Select(entry => entry.Y).ToList();
iPointsY.AddRange(lowerRightPoints.Select(entry => entry.Y));
if (Math.Abs(minY - maxY) < 0.001)
{
iPointsY.Add(minY + (float)_model.MinY);
iPointsY.Add(maxY + (float)_model.MaxY);
}
iPointsY = Converters.GetScaledValues(iPointsY, _originOffset, height);
var convertedIntegralPoints = new List <PointF>(iPointsX.Count / 2);
convertedIntegralPoints.AddRange(iPointsX.Select((t, i) => new PointF(t, iPointsY[i])));
var rectanglePoints = convertedIntegralPoints.GetRange(0, convertedIntegralPoints.Count / 2).Zip(
convertedIntegralPoints.GetRange(convertedIntegralPoints.Count / 2, convertedIntegralPoints.Count / 2),
(u, l) => (u, l)).ToList();
var pointsX = Converters.GetScaledValues(points.Select(entry => entry.X).ToList(), _originOffset,
width);
var pointsY = Converters.GetScaledValues(points.Select(entry => entry.Y).ToList(), _originOffset,
height);
var convertedPoints = new List <PointF>(pointsX.Count);
convertedPoints.AddRange(pointsX.Select((t, i) => new PointF(t, pointsY[i])));
_painter.DrawAxis((int)_originOffset);
_painter.DrawFunction(convertedPoints);
_painter.DrawIntegral(rectanglePoints);
DrawScale(_model.Min, _model.Max, width, height, "x");
if (Math.Abs(minY - maxY) < 0.001)
{
DrawScale(minY + (float)_model.MinY, maxY + (float)_model.MaxY, width, height, "y");
}
else
{
DrawScale(minY, maxY, width, height, "y");
}
}