//---------------------------------------------fix_degenerate_bisectrix_end
public static void fix_degenerate_bisectrix_end(LineParameters lp,
ref int x, ref int y)
{
int d = Basics.Round(((double)(x - lp.x2) * (double)(lp.y2 - lp.y1) -
(double)(y - lp.y2) * (double)(lp.x2 - lp.x1)) / lp.len);
if (d < line_subpixel_scale / 2)
{
x = lp.x2 + (lp.y2 - lp.y1);
y = lp.y2 - (lp.x2 - lp.x1);
}
}
//---------------------------------------------------------------------
public void Divide(LineParameters lp1, LineParameters lp2)
{
int xmid = (x1 + x2) >> 1;
int ymid = (y1 + y2) >> 1;
int len2 = len >> 1;
lp1 = this; // it is a struct so this is a copy
lp2 = this; // it is a struct so this is a copy
lp1.x2 = xmid;
lp1.y2 = ymid;
lp1.len = len2;
lp1.dx = Math.Abs(lp1.x2 - lp1.x1);
lp1.dy = Math.Abs(lp1.y2 - lp1.y1);
lp2.x1 = xmid;
lp2.y1 = ymid;
lp2.len = len2;
lp2.dx = Math.Abs(lp2.x2 - lp2.x1);
lp2.dy = Math.Abs(lp2.y2 - lp2.y1);
}
//---------------------------------------------------------------------
public bool SameOrthogonalQuadrant(LineParameters lp)
{
return(s_orthogonal_quadrant[octant] == s_orthogonal_quadrant[lp.octant]);
}
//-------------------------------------------fix_degenerate_bisectrix_start
public static void fix_degenerate_bisectrix_start(LineParameters lp,
ref int x, ref int y)
{
int d = Basics.Round(((double)(x - lp.x2) * (double)(lp.y2 - lp.y1) -
(double)(y - lp.y2) * (double)(lp.x2 - lp.x1)) / lp.len);
if (d < line_subpixel_scale / 2)
{
x = lp.x1 + (lp.y2 - lp.y1);
y = lp.y1 - (lp.x2 - lp.x1);
}
}
public const int line_subpixel_shift = 8; //----line_subpixel_shift
#endregion Fields
#region Methods
//-------------------------------------------------------------------------
public static void bisectrix(LineParameters l1,
LineParameters l2,
out int x, out int y)
{
double k = (double)(l2.len) / (double)(l1.len);
double tx = l2.x2 - (l2.x1 - l1.x1) * k;
double ty = l2.y2 - (l2.y1 - l1.y1) * k;
//All bisectrices must be on the right of the Line
//If the next point is on the left (l1 => l2.2)
//then the bisectix should be rotated by 180 degrees.
if ((double)(l2.x2 - l2.x1) * (double)(l2.y1 - l1.y1) <
(double)(l2.y2 - l2.y1) * (double)(l2.x1 - l1.x1) + 100.0)
{
tx -= (tx - l2.x1) * 2.0;
ty -= (ty - l2.y1) * 2.0;
}
// Check if the bisectrix is too short
double dx = tx - l2.x1;
double dy = ty - l2.y1;
if ((int)Math.Sqrt(dx * dx + dy * dy) < line_subpixel_scale)
{
x = (l2.x1 + l2.x1 + (l2.y1 - l1.y1) + (l2.y2 - l2.y1)) >> 1;
y = (l2.y1 + l2.y1 - (l2.x1 - l1.x1) - (l2.x2 - l2.x1)) >> 1;
return;
}
x = Basics.Round(tx);
y = Basics.Round(ty);
}
//---------------------------------------------------------------------
public bool SameOrthogonalQuadrant(LineParameters lp)
{
return s_orthogonal_quadrant[octant] == s_orthogonal_quadrant[lp.octant];
}
//---------------------------------------------------------------------
public bool SameDiagonalQuadrant(LineParameters lp)
{
return s_diagonal_quadrant[octant] == s_diagonal_quadrant[lp.octant];
}
//---------------------------------------------------------------------
public void Divide(LineParameters lp1, LineParameters lp2)
{
int xmid = (x1 + x2) >> 1;
int ymid = (y1 + y2) >> 1;
int len2 = len >> 1;
lp1 = this; // it is a struct so this is a copy
lp2 = this; // it is a struct so this is a copy
lp1.x2 = xmid;
lp1.y2 = ymid;
lp1.len = len2;
lp1.dx = Math.Abs(lp1.x2 - lp1.x1);
lp1.dy = Math.Abs(lp1.y2 - lp1.y1);
lp2.x1 = xmid;
lp2.y1 = ymid;
lp2.len = len2;
lp2.dx = Math.Abs(lp2.x2 - lp2.x1);
lp2.dy = Math.Abs(lp2.y2 - lp2.y1);
}
