public bool IsOnBorder(FigurePoint p, PolygonFigure pf)
{
var points = pf.Points;
bool onBorder = false;
for (int i = 0; i < points.Count; i++)
{
int j = (i + 1) % points.Count;
var p1 = points[i];
var p2 = points[j];
if (p1.x - p2.x == 0 && p1.x == p.x)
{
onBorder = p1.y < p2.y ? (p.y >= p1.y && p.y <= p2.y) : (p.y >= p2.y && p.y <= p1.y);
}
else if (p1.y - p2.y == 0 && p1.y == p.y)
{
onBorder = p1.x < p2.x ? (p.x >= p1.x && p.x <= p2.x) : (p.x >= p2.x && p.x <= p1.x);
}
else
{
var lc = new LineCutter(points[i], points[j], p, p);
if (lc.SimpleCutYFormule(p.x) == p.y)
{
onBorder = p1.x < p2.x ? (p.x >= p1.x && p.x <= p2.x) : (p.x >= p2.x && p.x <= p1.x);
}
}
if (onBorder)
{
return(true);
}
}
return(false);
}
private FigurePoint FindCutPoint(FigurePoint cutterP1, FigurePoint cutterP2, FigurePoint figureP1, FigurePoint figureP2)
{
if (cutterP2.x < cutterP1.x)
{
var p = cutterP1;
cutterP1 = cutterP2;
cutterP2 = p;
}
if (figureP2.x < figureP1.x)
{
var p = figureP1;
figureP1 = figureP2;
figureP2 = p;
}
var lc = new LineCutter(cutterP1, cutterP2, figureP1, figureP2);
return(lc.getPoint());
}