private void DoOffset(double delta)
{
m_destPolys = new List <List <IntPoint> >();
m_delta = delta;
if (ClipperBase.near_zero(delta))
{
m_destPolys.Capacity = m_polyNodes.ChildCount;
for (int i = 0; i < m_polyNodes.ChildCount; i++)
{
PolyNode polyNode = m_polyNodes.Childs[i];
if (polyNode.m_endtype == EndType.etClosedPolygon)
{
m_destPolys.Add(polyNode.m_polygon);
}
}
}
else
{
if (MiterLimit > 2.0)
{
m_miterLim = 2.0 / (MiterLimit * MiterLimit);
}
else
{
m_miterLim = 0.5;
}
double num = (ArcTolerance <= 0.0) ? 0.25 : ((!(ArcTolerance > Math.Abs(delta) * 0.25)) ? ArcTolerance : (Math.Abs(delta) * 0.25));
double num2 = 3.1415926535897931 / Math.Acos(1.0 - num / Math.Abs(delta));
m_sin = Math.Sin(6.2831853071795862 / num2);
m_cos = Math.Cos(6.2831853071795862 / num2);
m_StepsPerRad = num2 / 6.2831853071795862;
if (delta < 0.0)
{
m_sin = 0.0 - m_sin;
}
m_destPolys.Capacity = m_polyNodes.ChildCount * 2;
for (int j = 0; j < m_polyNodes.ChildCount; j++)
{
PolyNode polyNode2 = m_polyNodes.Childs[j];
m_srcPoly = polyNode2.m_polygon;
int count = m_srcPoly.Count;
if (count != 0 && (!(delta <= 0.0) || (count >= 3 && polyNode2.m_endtype == EndType.etClosedPolygon)))
{
m_destPoly = new List <IntPoint>();
if (count == 1)
{
if (polyNode2.m_jointype == JoinType.jtRound)
{
double num3 = 1.0;
double num4 = 0.0;
for (int k = 1; (double)k <= num2; k++)
{
m_destPoly.Add(new IntPoint(Round((double)m_srcPoly[0].X + num3 * delta), Round((double)m_srcPoly[0].Y + num4 * delta)));
double num5 = num3;
num3 = num3 * m_cos - m_sin * num4;
num4 = num5 * m_sin + num4 * m_cos;
}
}
else
{
double num6 = -1.0;
double num7 = -1.0;
for (int l = 0; l < 4; l++)
{
m_destPoly.Add(new IntPoint(Round((double)m_srcPoly[0].X + num6 * delta), Round((double)m_srcPoly[0].Y + num7 * delta)));
if (num6 < 0.0)
{
num6 = 1.0;
}
else if (num7 < 0.0)
{
num7 = 1.0;
}
else
{
num6 = -1.0;
}
}
}
m_destPolys.Add(m_destPoly);
}
else
{
m_normals.Clear();
m_normals.Capacity = count;
for (int m = 0; m < count - 1; m++)
{
m_normals.Add(GetUnitNormal(m_srcPoly[m], m_srcPoly[m + 1]));
}
if (polyNode2.m_endtype == EndType.etClosedLine || polyNode2.m_endtype == EndType.etClosedPolygon)
{
m_normals.Add(GetUnitNormal(m_srcPoly[count - 1], m_srcPoly[0]));
}
else
{
m_normals.Add(new DoublePoint(m_normals[count - 2]));
}
if (polyNode2.m_endtype == EndType.etClosedPolygon)
{
int k2 = count - 1;
for (int n = 0; n < count; n++)
{
OffsetPoint(n, ref k2, polyNode2.m_jointype);
}
m_destPolys.Add(m_destPoly);
}
else if (polyNode2.m_endtype == EndType.etClosedLine)
{
int k3 = count - 1;
for (int num8 = 0; num8 < count; num8++)
{
OffsetPoint(num8, ref k3, polyNode2.m_jointype);
}
m_destPolys.Add(m_destPoly);
m_destPoly = new List <IntPoint>();
DoublePoint doublePoint = m_normals[count - 1];
for (int num9 = count - 1; num9 > 0; num9--)
{
m_normals[num9] = new DoublePoint(0.0 - m_normals[num9 - 1].X, 0.0 - m_normals[num9 - 1].Y);
}
m_normals[0] = new DoublePoint(0.0 - doublePoint.X, 0.0 - doublePoint.Y);
k3 = 0;
for (int num10 = count - 1; num10 >= 0; num10--)
{
OffsetPoint(num10, ref k3, polyNode2.m_jointype);
}
m_destPolys.Add(m_destPoly);
}
else
{
int k4 = 0;
for (int num11 = 1; num11 < count - 1; num11++)
{
OffsetPoint(num11, ref k4, polyNode2.m_jointype);
}
if (polyNode2.m_endtype == EndType.etOpenButt)
{
int index = count - 1;
IntPoint item = new IntPoint(Round((double)m_srcPoly[index].X + m_normals[index].X * delta), Round((double)m_srcPoly[index].Y + m_normals[index].Y * delta));
m_destPoly.Add(item);
item = new IntPoint(Round((double)m_srcPoly[index].X - m_normals[index].X * delta), Round((double)m_srcPoly[index].Y - m_normals[index].Y * delta));
m_destPoly.Add(item);
}
else
{
int num12 = count - 1;
k4 = count - 2;
m_sinA = 0.0;
m_normals[num12] = new DoublePoint(0.0 - m_normals[num12].X, 0.0 - m_normals[num12].Y);
if (polyNode2.m_endtype == EndType.etOpenSquare)
{
DoSquare(num12, k4);
}
else
{
DoRound(num12, k4);
}
}
for (int num13 = count - 1; num13 > 0; num13--)
{
m_normals[num13] = new DoublePoint(0.0 - m_normals[num13 - 1].X, 0.0 - m_normals[num13 - 1].Y);
}
m_normals[0] = new DoublePoint(0.0 - m_normals[1].X, 0.0 - m_normals[1].Y);
k4 = count - 1;
for (int num14 = k4 - 1; num14 > 0; num14--)
{
OffsetPoint(num14, ref k4, polyNode2.m_jointype);
}
if (polyNode2.m_endtype == EndType.etOpenButt)
{
IntPoint item = new IntPoint(Round((double)m_srcPoly[0].X - m_normals[0].X * delta), Round((double)m_srcPoly[0].Y - m_normals[0].Y * delta));
m_destPoly.Add(item);
item = new IntPoint(Round((double)m_srcPoly[0].X + m_normals[0].X * delta), Round((double)m_srcPoly[0].Y + m_normals[0].Y * delta));
m_destPoly.Add(item);
}
else
{
k4 = 1;
m_sinA = 0.0;
if (polyNode2.m_endtype == EndType.etOpenSquare)
{
DoSquare(0, 1);
}
else
{
DoRound(0, 1);
}
}
m_destPolys.Add(m_destPoly);
}
}
}
}
}
}
//------------------------------------------------------------------------------
private void DoOffset(double delta)
{
m_destPolys = new List <List <IntPoint> >();
m_delta = delta;
//if Zero offset, just copy any CLOSED polygons to m_p and return ...
if (ClipperBase.near_zero(delta))
{
m_destPolys.Capacity = m_polyNodes.ChildCount;
for (int i = 0; i < m_polyNodes.ChildCount; i++)
{
PolyNode node = m_polyNodes.Childs[i];
if (node.m_endtype == EndType.etClosedPolygon)
{
m_destPolys.Add(node.m_polygon);
}
}
return;
}
//see offset_triginometry3.svg in the documentation folder ...
if (MiterLimit > 2)
{
m_miterLim = 2 / (MiterLimit * MiterLimit);
}
else
{
m_miterLim = 0.5;
}
double y;
if (ArcTolerance <= 0.0)
{
y = def_arc_tolerance;
}
else if (ArcTolerance > Math.Abs(delta) * def_arc_tolerance)
{
y = Math.Abs(delta) * def_arc_tolerance;
}
else
{
y = ArcTolerance;
}
//see offset_triginometry2.svg in the documentation folder ...
double steps = Math.PI / Math.Acos(1 - y / Math.Abs(delta));
m_sin = Math.Sin(two_pi / steps);
m_cos = Math.Cos(two_pi / steps);
m_StepsPerRad = steps / two_pi;
if (delta < 0.0)
{
m_sin = -m_sin;
}
m_destPolys.Capacity = m_polyNodes.ChildCount * 2;
for (int i = 0; i < m_polyNodes.ChildCount; i++)
{
PolyNode node = m_polyNodes.Childs[i];
m_srcPoly = node.m_polygon;
int len = m_srcPoly.Count;
if (len == 0 || (delta <= 0 && (len < 3 ||
node.m_endtype != EndType.etClosedPolygon)))
{
continue;
}
m_destPoly = new List <IntPoint>();
if (len == 1)
{
if (node.m_jointype == JoinType.jtRound)
{
double X = 1.0, Y = 0.0;
for (int j = 1; j <= steps; j++)
{
m_destPoly.Add(new IntPoint(
Round(m_srcPoly[0].X + X * delta),
Round(m_srcPoly[0].Y + Y * delta)));
double X2 = X;
X = X * m_cos - m_sin * Y;
Y = X2 * m_sin + Y * m_cos;
}
}
else
{
double X = -1.0, Y = -1.0;
for (int j = 0; j < 4; ++j)
{
m_destPoly.Add(new IntPoint(
Round(m_srcPoly[0].X + X * delta),
Round(m_srcPoly[0].Y + Y * delta)));
if (X < 0)
{
X = 1;
}
else if (Y < 0)
{
Y = 1;
}
else
{
X = -1;
}
}
}
m_destPolys.Add(m_destPoly);
continue;
}
//build m_normals ...
m_normals.Clear();
m_normals.Capacity = len;
for (int j = 0; j < len - 1; j++)
{
m_normals.Add(GetUnitNormal(m_srcPoly[j], m_srcPoly[j + 1]));
}
if (node.m_endtype == EndType.etClosedLine ||
node.m_endtype == EndType.etClosedPolygon)
{
m_normals.Add(GetUnitNormal(m_srcPoly[len - 1], m_srcPoly[0]));
}
else
{
m_normals.Add(new DoublePoint(m_normals[len - 2]));
}
if (node.m_endtype == EndType.etClosedPolygon)
{
int k = len - 1;
for (int j = 0; j < len; j++)
{
OffsetPoint(j, ref k, node.m_jointype);
}
m_destPolys.Add(m_destPoly);
}
else if (node.m_endtype == EndType.etClosedLine)
{
int k = len - 1;
for (int j = 0; j < len; j++)
{
OffsetPoint(j, ref k, node.m_jointype);
}
m_destPolys.Add(m_destPoly);
m_destPoly = new List <IntPoint>();
//re-build m_normals ...
DoublePoint n = m_normals[len - 1];
for (int j = len - 1; j > 0; j--)
{
m_normals[j] = new DoublePoint(-m_normals[j - 1].X, -m_normals[j - 1].Y);
}
m_normals[0] = new DoublePoint(-n.X, -n.Y);
k = 0;
for (int j = len - 1; j >= 0; j--)
{
OffsetPoint(j, ref k, node.m_jointype);
}
m_destPolys.Add(m_destPoly);
}
else
{
int k = 0;
for (int j = 1; j < len - 1; ++j)
{
OffsetPoint(j, ref k, node.m_jointype);
}
IntPoint pt1;
if (node.m_endtype == EndType.etOpenButt)
{
int j = len - 1;
pt1 = new IntPoint((int)Round(m_srcPoly[j].X + m_normals[j].X *
delta), (int)Round(m_srcPoly[j].Y + m_normals[j].Y * delta));
m_destPoly.Add(pt1);
pt1 = new IntPoint((int)Round(m_srcPoly[j].X - m_normals[j].X *
delta), (int)Round(m_srcPoly[j].Y - m_normals[j].Y * delta));
m_destPoly.Add(pt1);
}
else
{
int j = len - 1;
k = len - 2;
m_sinA = 0;
m_normals[j] = new DoublePoint(-m_normals[j].X, -m_normals[j].Y);
if (node.m_endtype == EndType.etOpenSquare)
{
DoSquare(j, k);
}
else
{
DoRound(j, k);
}
}
//re-build m_normals ...
for (int j = len - 1; j > 0; j--)
{
m_normals[j] = new DoublePoint(-m_normals[j - 1].X, -m_normals[j - 1].Y);
}
m_normals[0] = new DoublePoint(-m_normals[1].X, -m_normals[1].Y);
k = len - 1;
for (int j = k - 1; j > 0; --j)
{
OffsetPoint(j, ref k, node.m_jointype);
}
if (node.m_endtype == EndType.etOpenButt)
{
pt1 = new IntPoint((int)Round(m_srcPoly[0].X - m_normals[0].X * delta),
(int)Round(m_srcPoly[0].Y - m_normals[0].Y * delta));
m_destPoly.Add(pt1);
pt1 = new IntPoint((int)Round(m_srcPoly[0].X + m_normals[0].X * delta),
(int)Round(m_srcPoly[0].Y + m_normals[0].Y * delta));
m_destPoly.Add(pt1);
}
else
{
k = 1;
m_sinA = 0;
if (node.m_endtype == EndType.etOpenSquare)
{
DoSquare(0, 1);
}
else
{
DoRound(0, 1);
}
}
m_destPolys.Add(m_destPoly);
}
}
}
private void DoOffset(double delta)
{
m_destPolys = new List <List <IntPoint> >();
m_delta = delta;
if (ClipperBase.near_zero(delta))
{
m_destPolys.Capacity = m_polyNodes.ChildCount;
for (int i = 0; i < m_polyNodes.ChildCount; i++)
{
PolyNode polyNode = m_polyNodes.Childs[i];
if (polyNode.m_endtype == EndType.etClosedPolygon)
{
m_destPolys.Add(polyNode.m_polygon);
}
}
return;
}
if (MiterLimit > 2.0)
{
m_miterLim = 2.0 / (MiterLimit * MiterLimit);
}
else
{
m_miterLim = 0.5;
}
double num = (ArcTolerance <= 0.0) ? 0.25 : ((!(ArcTolerance > Math.Abs(delta) * 0.25)) ? ArcTolerance : (Math.Abs(delta) * 0.25));
double num2 = 3.1415926535897931 / Math.Acos(1.0 - num / Math.Abs(delta));
m_sin = Math.Sin(6.2831853071795862 / num2);
m_cos = Math.Cos(6.2831853071795862 / num2);
m_StepsPerRad = num2 / 6.2831853071795862;
if (delta < 0.0)
{
m_sin = 0.0 - m_sin;
}
m_destPolys.Capacity = m_polyNodes.ChildCount * 2;
IntPoint item = default(IntPoint);
for (int j = 0; j < m_polyNodes.ChildCount; j++)
{
PolyNode polyNode2 = m_polyNodes.Childs[j];
m_srcPoly = polyNode2.m_polygon;
int count = m_srcPoly.Count;
if (count == 0 || (delta <= 0.0 && (count < 3 || polyNode2.m_endtype != 0)))
{
continue;
}
m_destPoly = new List <IntPoint>();
if (count == 1)
{
if (polyNode2.m_jointype == JoinType.jtRound)
{
double num3 = 1.0;
double num4 = 0.0;
for (int k = 1; (double)k <= num2; k++)
{
List <IntPoint> destPoly = m_destPoly;
IntPoint intPoint = m_srcPoly[0];
long x = Round((double)intPoint.X + num3 * delta);
IntPoint intPoint2 = m_srcPoly[0];
destPoly.Add(new IntPoint(x, Round((double)intPoint2.Y + num4 * delta)));
double num5 = num3;
num3 = num3 * m_cos - m_sin * num4;
num4 = num5 * m_sin + num4 * m_cos;
}
}
else
{
double num6 = -1.0;
double num7 = -1.0;
for (int l = 0; l < 4; l++)
{
List <IntPoint> destPoly2 = m_destPoly;
IntPoint intPoint3 = m_srcPoly[0];
long x2 = Round((double)intPoint3.X + num6 * delta);
IntPoint intPoint4 = m_srcPoly[0];
destPoly2.Add(new IntPoint(x2, Round((double)intPoint4.Y + num7 * delta)));
if (num6 < 0.0)
{
num6 = 1.0;
}
else if (num7 < 0.0)
{
num7 = 1.0;
}
else
{
num6 = -1.0;
}
}
}
m_destPolys.Add(m_destPoly);
continue;
}
m_normals.Clear();
m_normals.Capacity = count;
for (int m = 0; m < count - 1; m++)
{
m_normals.Add(GetUnitNormal(m_srcPoly[m], m_srcPoly[m + 1]));
}
if (polyNode2.m_endtype == EndType.etClosedLine || polyNode2.m_endtype == EndType.etClosedPolygon)
{
m_normals.Add(GetUnitNormal(m_srcPoly[count - 1], m_srcPoly[0]));
}
else
{
m_normals.Add(new DoublePoint(m_normals[count - 2]));
}
if (polyNode2.m_endtype == EndType.etClosedPolygon)
{
int k2 = count - 1;
for (int n = 0; n < count; n++)
{
OffsetPoint(n, ref k2, polyNode2.m_jointype);
}
m_destPolys.Add(m_destPoly);
continue;
}
if (polyNode2.m_endtype == EndType.etClosedLine)
{
int k3 = count - 1;
for (int num8 = 0; num8 < count; num8++)
{
OffsetPoint(num8, ref k3, polyNode2.m_jointype);
}
m_destPolys.Add(m_destPoly);
m_destPoly = new List <IntPoint>();
DoublePoint doublePoint = m_normals[count - 1];
for (int num9 = count - 1; num9 > 0; num9--)
{
List <DoublePoint> normals = m_normals;
int index = num9;
DoublePoint doublePoint2 = m_normals[num9 - 1];
double x3 = 0.0 - doublePoint2.X;
DoublePoint doublePoint3 = m_normals[num9 - 1];
normals[index] = new DoublePoint(x3, 0.0 - doublePoint3.Y);
}
m_normals[0] = new DoublePoint(0.0 - doublePoint.X, 0.0 - doublePoint.Y);
k3 = 0;
for (int num10 = count - 1; num10 >= 0; num10--)
{
OffsetPoint(num10, ref k3, polyNode2.m_jointype);
}
m_destPolys.Add(m_destPoly);
continue;
}
int k4 = 0;
for (int num11 = 1; num11 < count - 1; num11++)
{
OffsetPoint(num11, ref k4, polyNode2.m_jointype);
}
if (polyNode2.m_endtype == EndType.etOpenButt)
{
int index2 = count - 1;
IntPoint intPoint5 = m_srcPoly[index2];
double num12 = intPoint5.X;
DoublePoint doublePoint4 = m_normals[index2];
long x4 = Round(num12 + doublePoint4.X * delta);
IntPoint intPoint6 = m_srcPoly[index2];
double num13 = intPoint6.Y;
DoublePoint doublePoint5 = m_normals[index2];
item = new IntPoint(x4, Round(num13 + doublePoint5.Y * delta));
m_destPoly.Add(item);
IntPoint intPoint7 = m_srcPoly[index2];
double num14 = intPoint7.X;
DoublePoint doublePoint6 = m_normals[index2];
long x5 = Round(num14 - doublePoint6.X * delta);
IntPoint intPoint8 = m_srcPoly[index2];
double num15 = intPoint8.Y;
DoublePoint doublePoint7 = m_normals[index2];
item = new IntPoint(x5, Round(num15 - doublePoint7.Y * delta));
m_destPoly.Add(item);
}
else
{
int num16 = count - 1;
k4 = count - 2;
m_sinA = 0.0;
List <DoublePoint> normals2 = m_normals;
int index3 = num16;
DoublePoint doublePoint8 = m_normals[num16];
double x6 = 0.0 - doublePoint8.X;
DoublePoint doublePoint9 = m_normals[num16];
normals2[index3] = new DoublePoint(x6, 0.0 - doublePoint9.Y);
if (polyNode2.m_endtype == EndType.etOpenSquare)
{
DoSquare(num16, k4);
}
else
{
DoRound(num16, k4);
}
}
for (int num17 = count - 1; num17 > 0; num17--)
{
List <DoublePoint> normals3 = m_normals;
int index4 = num17;
DoublePoint doublePoint10 = m_normals[num17 - 1];
double x7 = 0.0 - doublePoint10.X;
DoublePoint doublePoint11 = m_normals[num17 - 1];
normals3[index4] = new DoublePoint(x7, 0.0 - doublePoint11.Y);
}
List <DoublePoint> normals4 = m_normals;
DoublePoint doublePoint12 = m_normals[1];
double x8 = 0.0 - doublePoint12.X;
DoublePoint doublePoint13 = m_normals[1];
normals4[0] = new DoublePoint(x8, 0.0 - doublePoint13.Y);
k4 = count - 1;
for (int num18 = k4 - 1; num18 > 0; num18--)
{
OffsetPoint(num18, ref k4, polyNode2.m_jointype);
}
if (polyNode2.m_endtype == EndType.etOpenButt)
{
IntPoint intPoint9 = m_srcPoly[0];
double num19 = intPoint9.X;
DoublePoint doublePoint14 = m_normals[0];
long x9 = Round(num19 - doublePoint14.X * delta);
IntPoint intPoint10 = m_srcPoly[0];
double num20 = intPoint10.Y;
DoublePoint doublePoint15 = m_normals[0];
item = new IntPoint(x9, Round(num20 - doublePoint15.Y * delta));
m_destPoly.Add(item);
IntPoint intPoint11 = m_srcPoly[0];
double num21 = intPoint11.X;
DoublePoint doublePoint16 = m_normals[0];
long x10 = Round(num21 + doublePoint16.X * delta);
IntPoint intPoint12 = m_srcPoly[0];
double num22 = intPoint12.Y;
DoublePoint doublePoint17 = m_normals[0];
item = new IntPoint(x10, Round(num22 + doublePoint17.Y * delta));
m_destPoly.Add(item);
}
else
{
k4 = 1;
m_sinA = 0.0;
if (polyNode2.m_endtype == EndType.etOpenSquare)
{
DoSquare(0, 1);
}
else
{
DoRound(0, 1);
}
}
m_destPolys.Add(m_destPoly);
}
}