Exemplos de IsOnSegment em C++ (Cpp)

Exemplo n.º 1

/** Do line segments (x1, y1)--(x2, y2) and (x3, y3)--(x4, y4) intersect? */
bool DoLineSegmentsIntersect(int x1, int y1, int x2, int y2,
                             int x3, int y3, int x4, int y4) {
  char d1 = ComputeDirection(x3, y3, x4, y4, x1, y1);
  char d2 = ComputeDirection(x3, y3, x4, y4, x2, y2);
  char d3 = ComputeDirection(x1, y1, x2, y2, x3, y3);
  char d4 = ComputeDirection(x1, y1, x2, y2, x4, y4);
  return (((d1 > 0 && d2 < 0) || (d1 < 0 && d2 > 0)) &&
          ((d3 > 0 && d4 < 0) || (d3 < 0 && d4 > 0))) ||
         (d1 == 0 && IsOnSegment(x3, y3, x4, y4, x1, y1)) ||
         (d2 == 0 && IsOnSegment(x3, y3, x4, y4, x2, y2)) ||
         (d3 == 0 && IsOnSegment(x1, y1, x2, y2, x3, y3)) ||
         (d4 == 0 && IsOnSegment(x1, y1, x2, y2, x4, y4));
}

Exemplo n.º 2

Arquivo: geometry.cpp Projeto: nslo/path-planning-2d

/** Do line segments (x1, y1)--(x2, y2) and (x3, y3)--(x4, y4) intersect? */
bool edge_edge_intersect(double x1, double y1, double x2, double y2,
        double x3, double y3, double x4, double y4)
{
    char d1 = ComputeDirection(x3, y3, x4, y4, x1, y1);
    char d2 = ComputeDirection(x3, y3, x4, y4, x2, y2);
    char d3 = ComputeDirection(x1, y1, x2, y2, x3, y3);
    char d4 = ComputeDirection(x1, y1, x2, y2, x4, y4);

    return (((d1 > 0 && d2 < 0) || (d1 < 0 && d2 > 0)) &&
            ((d3 > 0 && d4 < 0) || (d3 < 0 && d4 > 0))) ||
        (d1 == 0 && IsOnSegment(x3, y3, x4, y4, x1, y1)) ||
        (d2 == 0 && IsOnSegment(x3, y3, x4, y4, x2, y2)) ||
        (d3 == 0 && IsOnSegment(x1, y1, x2, y2, x3, y3)) ||
        (d4 == 0 && IsOnSegment(x1, y1, x2, y2, x4, y4));
}