private bool signedTriangleSquareCheck(LineSegment other, IntersectionCheckOptions option)
{
int call1 = signedTriangleSquare(Start, End, other.Start);
int call2 = signedTriangleSquare(Start, End, other.End);
int call3 = signedTriangleSquare(other.Start, other.End, Start);
int call4 = signedTriangleSquare(other.Start, other.End, End);
return option == IntersectionCheckOptions.WithoutEdgePoints ? call1*call2 < 0 && call3*call4 < 0 : call1*call2 <= 0 && call3*call4 <= 0;
}
public Triangle(Point i, Point j, Point k)
{
I = i;
J = j;
K = k;
IJ = new LineSegment(i, j);
JK = new LineSegment(j, k);
KI = new LineSegment(k, i);
_square = null;
}
public void PointsInputHandler(object sender, MouseEventArgs e)
{
Contour currentContour = Contours.FirstOrDefault(x => !x.IsCompleted);
if (currentContour == null){
currentContour = new Contour(Contours.Count + 1);
Contours.Add(currentContour);
}
var newPoint = new Point(e.X, _drawer.CanvasHeight - e.Y){Index = _lastPointIndex + 1};
if (currentContour.Head == null) {
currentContour.Add(newPoint);
_drawer.DrawPoints(Pens.Black, newPoint);
//Ekaterina
_drawer.RefreshImage();
//end Ekaterina
_lastPointIndex++;
} else{
if (currentContour.Tail == null){
var newLineSegment = new LineSegment(currentContour.Head, newPoint);
if (Contours.Where(x => x != currentContour).Any(x => x.IntersectsWithLineSegment(newLineSegment, IntersectionCheckOptions.WithEdgePoints)) ||
currentContour.IntersectsWithLineSegment(newLineSegment, IntersectionCheckOptions.WithoutEdgePoints)){
MessageBox.Show(ErrorMessageBoxMessage, ErrorMessageBoxTitle);
} else {
currentContour.Add(newPoint);
_drawer.DrawLineSegments(Pens.Black, newLineSegment);
_lastPointIndex++;
}
} else{
var newLineSegment = new LineSegment(currentContour.Tail, newPoint);
if (Contours.Where(x => x != currentContour).Any(x => x.IntersectsWithLineSegment(newLineSegment, IntersectionCheckOptions.WithEdgePoints)) ||
currentContour.IntersectsWithLineSegment(newLineSegment, IntersectionCheckOptions.WithoutEdgePoints)) {
MessageBox.Show(ErrorMessageBoxMessage, ErrorMessageBoxTitle);
} else{
currentContour.Add(newPoint);
if (!currentContour.IsCompleted) {
_drawer.DrawLineSegments(Pens.Black, newLineSegment);
_lastPointIndex++;
} else {
_drawer.DrawLineSegments(Pens.Black, new LineSegment(currentContour.Tail, currentContour.Head));
}
}
}
}
if (currentContour.IsCompleted){
_tabControlHelper.CreatePageForContour(currentContour);
}
}
private bool projectionIntersectionCheck(LineSegment other, IntersectionCheckOptions option)
{
bool call1 = projectionIntersection(Start.X, End.X, other.Start.X, other.End.X, option);
bool call2 = projectionIntersection(Start.Y, End.Y, other.Start.Y, other.End.Y, option);
return call1 && call2;
}
public bool Intersects(LineSegment other, IntersectionCheckOptions option)
{
return projectionIntersectionCheck(other, option) && signedTriangleSquareCheck(other, option);
}
