public void DrawCurve(PCurve curve, SKCanvas canv) {
int drawnPoints = 0;
var step = _BrushInfoService.XSpacing;
var div = curve.DivideLength(step);
float len = 0;
for(int i = 0;i< div.Count - 1; i++)
{
DrawPoint(div[i], div[i + 1], canv, drawnPoints, CurvePositionKoeficient(len, curve.Length));
drawnPoints++;
len += PVector.DistanceBetween(div[i], div[i + 1]).ToFloat();
}
PVector vec = PVector.Sub(div.Last(), div.Count>1?div[div.Count - 2]:PVector.Add(div.Last(), new PVector(0,1)));
vec.Add(div.Last());
DrawPoint(div.Last(), vec, canv, drawnPoints, CurvePositionKoeficient(curve.Length, curve.Length));
drawnPoints++;
}