//三点法构造弧段的Segment
private ISegment MadeArcSeg_3Point(IPoint pPoint1, IPoint pPoint2, IPoint pPoint3)
{
IConstructCircularArc pArc = new CircularArcClass();
pArc.ConstructThreePoints(pPoint1, pPoint2, pPoint3, true);
return((ISegment)pArc);
}
//构造圆弧点
private void button1_Click(object sender, EventArgs e)
{
delFeature("point");
//构造一段圆弧
IPoint centerPoint = new PointClass();
centerPoint.PutCoords(10, 0);
IPoint fromPoint = new PointClass();
fromPoint.PutCoords(0, 0);
IPoint toPoint = new PointClass();
toPoint.PutCoords(0, 20);
IConstructCircularArc circularArcConstruction = new CircularArcClass();
circularArcConstruction.ConstructThreePoints(fromPoint, centerPoint, toPoint, false);
//构造圆弧点
IConstructMultipoint constructMultipoint = new MultipointClass();
constructMultipoint.ConstructArcPoints(circularArcConstruction as ICircularArc);
IPointCollection pointCollection = constructMultipoint as IPointCollection;
for (int i = 0; i < pointCollection.PointCount; i++)
{
addFeature("point", pointCollection.get_Point(i));
}
axMapControl1.Refresh();
}
/// <summary>
/// 通过开始点和结束点创建半圆弧片段
/// </summary>
/// <param name="fromPoint">开始点</param>
/// <param name="toPoint">结束点</param>
/// <returns>半圆弧片段</returns>
public static ISegment CreateHalfCircularArcByTwoPoints(IPoint fromPoint, IPoint toPoint)
{
ILine line = CreateLineByTwoPoints(fromPoint, toPoint);
ILine normal = new LineClass();
line.QueryNormal(esriSegmentExtension.esriNoExtension, 0.5, true, (double)(line.Length / 2.0), normal);
IConstructCircularArc Constructor = new CircularArcClass();
Constructor.ConstructThreePoints(fromPoint, normal.ToPoint, toPoint, true);
return((ISegment)Constructor);
}
//构造交点
private void button4_Click(object sender, EventArgs e)
{
delFeature("point");
IPoint[] points = new IPoint[4];
for (int i = 0; i < 4; i++)
{
points[i] = new PointClass();
}
points[0].PutCoords(15, 10);
points[1].PutCoords(20, 60);
points[2].PutCoords(40, 60);
points[3].PutCoords(45, 10);
addFeature("point", points[0]);
addFeature("point", points[1]);
addFeature("point", points[2]);
addFeature("point", points[3]);
//构造Bezier曲线
IBezierCurveGEN bezierCurve = new BezierCurveClass();
bezierCurve.PutCoords(ref points);
IPoint centerPoint = new PointClass();
centerPoint.PutCoords(30, 30);
IPoint fromPoint = new PointClass();
fromPoint.PutCoords(10, 10);
IPoint toPoint = new PointClass();
toPoint.PutCoords(50, 10);
//构造圆弧
IConstructCircularArc circularArcConstruction = new CircularArcClass();
circularArcConstruction.ConstructThreePoints(fromPoint, centerPoint, toPoint, false);
object param0;
object param1;
object isTangentPoint;
IConstructMultipoint constructMultipoint = new MultipointClass();
constructMultipoint.ConstructIntersection(circularArcConstruction as ISegment, esriSegmentExtension.esriNoExtension, bezierCurve as ISegment, esriSegmentExtension.esriNoExtension, out param0, out param1, out isTangentPoint);
IMultipoint multipoint = constructMultipoint as IMultipoint;
IPointCollection pointCollection = multipoint as IPointCollection;
for (int i = 0; i < pointCollection.PointCount; i++)
{
addFeature("point", pointCollection.get_Point(i));
}
axMapControl1.Extent = multipoint.Envelope;
axMapControl1.Refresh();
}
// 创建弧线
private IPolyline CreateCirculeArc(IPoint fromPoint, IPoint toPoint, double chordCoef)
{
// 如果起点和终点相等，返回一个直线
if (fromPoint.X == toPoint.X && fromPoint.Y == toPoint.Y)
{
object missing = Type.Missing;
IPolyline polyline = new PolylineClass();
var pointCol = (IPointCollection)polyline;
pointCol.AddPoint(fromPoint, missing, missing);
pointCol.AddPoint(toPoint, missing, missing);
return(polyline);
}
// 根据起止点建立直线A方程，
// 利用A线上的中点建立与A线垂直的线方程，
// 利用与中点的距离确定直线A两侧对称点
double midX = (fromPoint.X + toPoint.X) / 2;
double midY = (fromPoint.Y + toPoint.Y) / 2;
double k = (fromPoint.Y - toPoint.Y) / (fromPoint.X - toPoint.X); // 直线斜率
double h = Math.Pow(Math.Pow((fromPoint.Y - toPoint.Y), 2.0) + Math.Pow((fromPoint.X - toPoint.X), 2.0), 0.5); // 直线长
double h2 = h * chordCoef; // 获得0.1, 0.2, 0.3...倍的直线长
//double sign = Math.Pow(-1, offsetCount - 1); // 左右对称点符号
double sign = 1; // 表示正负号
if (fromPoint.X > toPoint.X)
{
sign = -1;
}
else if (fromPoint.X == toPoint.X && fromPoint.Y > toPoint.Y)
{
sign = -1;
}
double x = midX + sign * (-1) * chordCoef * h2 * k / Math.Pow(1 + k * k, 0.5); // 求解后的x
double y = midY + sign * chordCoef * h2 / Math.Pow(1 + k * k, 0.5); // 求解后的y
IPoint arcPoint = new PointClass();
arcPoint.PutCoords(x, y);
IConstructCircularArc2 circularArc = new CircularArcClass();
circularArc.ConstructThreePoints(fromPoint, arcPoint, toPoint, true);
IPolyline circularPolyline = new PolylineClass();
var segementColl = (ISegmentCollection)circularPolyline;
var segment = (ISegment)circularArc;
segementColl.AddSegment(segment);
return(circularPolyline);
}
public override void OnMouseMove(int Button, int Shift, int X, int Y)
{
IPoint pMovePt = m_hookHelper.ActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(X, Y);
pMovePt = GIS.GraphicEdit.SnapSetting.getSnapPoint(pMovePt);
if (m_lMouseDownCount == 1)
{
m_pLineFeedback.MoveTo(pMovePt);
}
else if (m_lMouseDownCount == 2)
{
m_bCreated = false;
IEnvelope pEnv = new EnvelopeClass();
pEnv.UpperLeft = m_pFirstPoint;
pEnv.LowerRight = m_pSecondPoint;
IConstructCircularArc pEllipArc = new CircularArcClass();
pEllipArc.ConstructThreePoints(m_pFirstPoint, m_pSecondPoint, pMovePt, true);
m_pCircleArc = pEllipArc as ICircularArc;
m_hookHelper.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewForeground, null, null);
}
DataEditCommon.g_pAxMapControl.Focus();
}
private ISegmentCollection createSegments(Cell cell, BoostVoronoi bv, ArcConstructionMethods method, ISpatialReference spatialReference)
{
List <Cell> cells = bv.Cells;
List <Edge> edges = bv.Edges;
List <Vertex> vertices = bv.Vertices;
IPoint previousEndPoint = null;
ISegmentCollection segmentCollection = new PolygonClass()
{
SpatialReference = spatialReference
};
// As per boost documentation, edges are returned in counter clockwise (CCW) rotation.
// voronoi_edge_type* next() Returns the pointer to the CCW next edge within the corresponding Voronoi cell. Edges not necessarily share a common vertex (e.g. infinite edges).
for (int i = cell.EdgesIndex.Count - 1; i >= 0; i--)
{
Edge edge = edges[cell.EdgesIndex[i]];
//If the vertex index equals -1, it means the edge is infinite. It is impossible to print the coordinates.
if (!edge.IsFinite && edge.End < 0)
{
// this is the ending portion of a pair of infinite edges, file the previous edge with Start >= 0
Edge previous = null;
for (int k = i + 1; k < cell.EdgesIndex.Count; k++)
{
previous = edges[cell.EdgesIndex[k]];
if (previous.End >= 0)
{
break;
}
previous = null;
}
if (previous == null)
{
for (int k = 0; k < i; k++)
{
previous = edges[cell.EdgesIndex[k]];
if (previous.End >= 0)
{
break;
}
previous = null;
}
}
if (previous == null)
{
throw new Exception("No outbound infinite edge could be found");
}
//Add a straight line segment
Vertex start = vertices[previous.End];
IPoint FromPoint = new PointClass()
{
X = start.X, Y = start.Y, SpatialReference = spatialReference
};
Vertex end = vertices[edge.Start];
IPoint ToPoint = new PointClass()
{
X = end.X, Y = end.Y, SpatialReference = spatialReference
};
segmentCollection.AddSegment(new LineClass()
{
FromPoint = FromPoint, ToPoint = ToPoint, SpatialReference = spatialReference
});
previousEndPoint = ToPoint;
}
else if (edge.IsFinite)
{
Vertex start = vertices[edge.End];
IPoint FromPoint = new PointClass()
{
X = start.X, Y = start.Y, SpatialReference = spatialReference
};
if (previousEndPoint != null)
{
if ((Math.Abs(previousEndPoint.X - FromPoint.X) > 0.05 || Math.Abs(previousEndPoint.X - FromPoint.X) > 0.05))
{
throw new Exception("Significant change between last end point and current start point");
}
else
{
FromPoint = previousEndPoint;
}
}
Vertex end = vertices[edge.Start];
IPoint ToPoint = new PointClass()
{
X = end.X, Y = end.Y, SpatialReference = spatialReference
};
if (method == ArcConstructionMethods.Straight || edge.IsLinear)
{
segmentCollection.AddSegment(new LineClass()
{
FromPoint = FromPoint, ToPoint = ToPoint, SpatialReference = spatialReference
});
previousEndPoint = ToPoint;
}
else
{
// We need three points, use start, end, mid-point between focus and directrix
Cell twinCell = cells[edges[edge.Twin].Cell];
VPoint pointSite; VSegment lineSite;
if (cell.ContainsPoint && twinCell.ContainsSegment)
{
pointSite = bv.RetrieveInputPoint(cell);
lineSite = bv.RetrieveInputSegment(twinCell);
}
else if (cell.ContainsSegment && twinCell.ContainsPoint)
{
pointSite = bv.RetrieveInputPoint(twinCell);
lineSite = bv.RetrieveInputSegment(cell);
}
else
{
throw new Exception("Invalid edge, curves should only be present between a point and a line");
}
double scaleFactor = Convert.ToDouble(bv.ScaleFactor);
IPoint aoPointSite = new Point()
{
X = Convert.ToDouble(pointSite.X) / scaleFactor,
Y = Convert.ToDouble(pointSite.Y) / scaleFactor,
SpatialReference = spatialReference
};
ISegment aoLineSite = new LineClass()
{
FromPoint = new PointClass()
{
X = Convert.ToDouble(lineSite.Start.X) / scaleFactor,
Y = Convert.ToDouble(lineSite.Start.Y) / scaleFactor,
SpatialReference = spatialReference
},
ToPoint = new PointClass()
{
X = Convert.ToDouble(lineSite.End.X) / scaleFactor,
Y = Convert.ToDouble(lineSite.End.Y) / scaleFactor,
SpatialReference = spatialReference
},
SpatialReference = spatialReference
};
if (method == ArcConstructionMethods.Approximate)
{
List <Vertex> sampledVerticed = null;
try
{
sampledVerticed = bv.SampleCurvedEdge(edge, aoLineSite.Length / 10);
}
catch (FocusOnDirectixException e)
{
//Log any exception here is required
sampledVerticed = new List <Vertex>()
{
start, end
};
}
catch (UnsolvableVertexException e)
{
sampledVerticed = new List <Vertex>()
{
start, end
};
}
sampledVerticed.Reverse();
List <IPoint> discretizedEdge = sampledVerticed.Select(
p => new Point()
{
X = p.X, Y = p.Y
}
).ToList <IPoint>();
IPoint prev = discretizedEdge[0];
foreach (IPoint v in discretizedEdge.Skip(1))
{
segmentCollection.AddSegment(new LineClass()
{
FromPoint = new Point()
{
X = prev.X, Y = prev.Y, SpatialReference = spatialReference
},
ToPoint = new Point()
{
X = v.X, Y = v.Y, SpatialReference = spatialReference
},
SpatialReference = spatialReference
});
prev = v;
}
previousEndPoint = discretizedEdge.Last();
}
else if (method == ArcConstructionMethods.Circular)
{
IPoint nearPoint = ((IProximityOperator)aoLineSite).ReturnNearestPoint(aoPointSite, esriSegmentExtension.esriNoExtension);
IPoint midpoint = new PointClass()
{
X = (nearPoint.X + aoPointSite.X) / 2,
Y = (nearPoint.Y + aoPointSite.Y) / 2,
SpatialReference = spatialReference
};
IConstructCircularArc constArc = new CircularArcClass()
{
SpatialReference = spatialReference
};
constArc.ConstructThreePoints(FromPoint, midpoint, ToPoint, false);
ICircularArc arc = (ICircularArc)constArc;
if (!arc.IsMinor)
{
constArc = new CircularArcClass()
{
SpatialReference = spatialReference
};
constArc.ConstructEndPointsRadius(FromPoint, ToPoint, !arc.IsCounterClockwise, arc.Radius, true);
arc = (ICircularArc)constArc;
}
segmentCollection.AddSegment((ISegment)arc);
previousEndPoint = arc.ToPoint;
}
else if (method == ArcConstructionMethods.Ellipse)
{
IPoint nearPoint = ((IProximityOperator)aoLineSite).ReturnNearestPoint(aoPointSite, esriSegmentExtension.esriExtendTangents);
nearPoint.SpatialReference = spatialReference;
ILine lineToFocus = new LineClass()
{
FromPoint = nearPoint, ToPoint = aoPointSite, SpatialReference = spatialReference
};
ILine semiMajor = new LineClass()
{
SpatialReference = spatialReference
};
lineToFocus.QueryTangent(esriSegmentExtension.esriExtendTangentAtTo, 1, true, 100 * lineToFocus.Length, semiMajor);
IPoint center = new PointClass()
{
X = (semiMajor.FromPoint.X + semiMajor.ToPoint.X) / 2,
Y = (semiMajor.FromPoint.Y + semiMajor.ToPoint.Y) / 2,
SpatialReference = spatialReference
};
double minor_length = Math.Sqrt(
Math.Pow(distance(semiMajor.FromPoint, ToPoint) + distance(semiMajor.ToPoint, ToPoint), 2)
- Math.Pow(semiMajor.Length, 2));
IEllipticArc arc = new EllipticArcClass()
{
SpatialReference = spatialReference
};
double rotation = lineToFocus.Angle;
double from = GetAngle(center, FromPoint);
arc.PutCoords(false, center, FromPoint, ToPoint, rotation, minor_length / semiMajor.Length, esriArcOrientation.esriArcMinor);
segmentCollection.AddSegment((ISegment)arc);
previousEndPoint = arc.ToPoint;
}
}
}
}
return(segmentCollection);
}
public override void OnMouseMove(int Button, int Shift, int X, int Y)
{
IPoint pMovePt = m_hookHelper.ActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(X, Y);
pMovePt = GIS.GraphicEdit.SnapSetting.getSnapPoint(pMovePt);
if (m_lMouseDownCount == 1)
{
m_pLineFeedback.MoveTo(pMovePt);
}
else if (m_lMouseDownCount == 2)
{
m_bCreated = false;
IEnvelope pEnv = new EnvelopeClass();
pEnv.UpperLeft = m_pFirstPoint;
pEnv.LowerRight = m_pSecondPoint;
IConstructCircularArc pEllipArc = new CircularArcClass();
pEllipArc.ConstructThreePoints(m_pFirstPoint, m_pSecondPoint, pMovePt, true);
m_pCircleArc = pEllipArc as ICircularArc;
m_hookHelper.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewForeground, null, null);
}
DataEditCommon.g_pAxMapControl.Focus();
}
private ISegmentCollection createSegments(Cell cell,BoostVoronoi bv,ArcConstructionMethods method,ISpatialReference spatialReference)
{
List<Cell> cells = bv.Cells;
List<Edge> edges = bv.Edges;
List<Vertex> vertices = bv.Vertices;
IPoint previousEndPoint = null;
ISegmentCollection segmentCollection = new PolygonClass() { SpatialReference = spatialReference };
// As per boost documentation, edges are returned in counter clockwise (CCW) rotation.
// voronoi_edge_type* next() Returns the pointer to the CCW next edge within the corresponding Voronoi cell. Edges not necessarily share a common vertex (e.g. infinite edges).
for (int i = cell.EdgesIndex.Count - 1; i >= 0; i--)
{
Edge edge = edges[cell.EdgesIndex[i]];
//If the vertex index equals -1, it means the edge is infinite. It is impossible to print the coordinates.
if (!edge.IsFinite && edge.End < 0)
{
// this is the ending portion of a pair of infinite edges, file the previous edge with Start >= 0
Edge previous = null;
for (int k = i + 1; k < cell.EdgesIndex.Count; k++)
{
previous = edges[cell.EdgesIndex[k]];
if (previous.End >= 0)
break;
previous = null;
}
if (previous == null)
{
for (int k = 0; k < i; k++)
{
previous = edges[cell.EdgesIndex[k]];
if (previous.End >= 0)
break;
previous = null;
}
}
if (previous == null)
throw new Exception("No outbound infinite edge could be found");
//Add a straight line segment
Vertex start = vertices[previous.End];
IPoint FromPoint = new PointClass() { X = start.X, Y = start.Y, SpatialReference = spatialReference };
Vertex end = vertices[edge.Start];
IPoint ToPoint = new PointClass() { X = end.X, Y = end.Y, SpatialReference = spatialReference };
segmentCollection.AddSegment(new LineClass() { FromPoint = FromPoint, ToPoint = ToPoint, SpatialReference = spatialReference });
previousEndPoint = ToPoint;
}
else if (edge.IsFinite)
{
Vertex start = vertices[edge.End];
IPoint FromPoint = new PointClass() { X = start.X, Y = start.Y, SpatialReference = spatialReference };
if (previousEndPoint != null)
{
if ((Math.Abs(previousEndPoint.X - FromPoint.X) > 0.05 || Math.Abs(previousEndPoint.X - FromPoint.X) > 0.05))
throw new Exception("Significant change between last end point and current start point");
else
FromPoint = previousEndPoint;
}
Vertex end = vertices[edge.Start];
IPoint ToPoint = new PointClass() { X = end.X, Y = end.Y, SpatialReference = spatialReference };
if (method == ArcConstructionMethods.Straight || edge.IsLinear)
{
segmentCollection.AddSegment(new LineClass() { FromPoint = FromPoint, ToPoint = ToPoint, SpatialReference = spatialReference });
previousEndPoint = ToPoint;
}
else
{
// We need three points, use start, end, mid-point between focus and directrix
Cell twinCell = cells[edges[edge.Twin].Cell];
VPoint pointSite; VSegment lineSite;
if (cell.ContainsPoint && twinCell.ContainsSegment)
{
pointSite = bv.RetrieveInputPoint(cell);
lineSite = bv.RetrieveInputSegment(twinCell);
}
else if (cell.ContainsSegment && twinCell.ContainsPoint)
{
pointSite = bv.RetrieveInputPoint(twinCell);
lineSite = bv.RetrieveInputSegment(cell);
}
else
{
throw new Exception("Invalid edge, curves should only be present between a point and a line");
}
double scaleFactor = Convert.ToDouble(bv.ScaleFactor);
IPoint aoPointSite = new Point()
{
X = Convert.ToDouble(pointSite.X) / scaleFactor,
Y = Convert.ToDouble(pointSite.Y) / scaleFactor,
SpatialReference = spatialReference
};
ISegment aoLineSite = new LineClass()
{
FromPoint = new PointClass()
{
X = Convert.ToDouble(lineSite.Start.X) / scaleFactor,
Y = Convert.ToDouble(lineSite.Start.Y) / scaleFactor,
SpatialReference = spatialReference
},
ToPoint = new PointClass()
{
X = Convert.ToDouble(lineSite.End.X) / scaleFactor,
Y = Convert.ToDouble(lineSite.End.Y) / scaleFactor,
SpatialReference = spatialReference
},
SpatialReference = spatialReference
};
if (method == ArcConstructionMethods.Approximate)
{
List<Vertex> sampledVerticed = null;
try
{
sampledVerticed = bv.SampleCurvedEdge(edge, aoLineSite.Length / 10);
}
catch (FocusOnDirectixException e)
{
//Log any exception here is required
sampledVerticed = new List<Vertex>() { start, end };
}
catch (UnsolvableVertexException e)
{
sampledVerticed = new List<Vertex>() { start, end };
}
sampledVerticed.Reverse();
List<IPoint> discretizedEdge = sampledVerticed.Select(
p => new Point() { X = p.X, Y = p.Y }
).ToList<IPoint>();
IPoint prev = discretizedEdge[0];
foreach (IPoint v in discretizedEdge.Skip(1))
{
segmentCollection.AddSegment(new LineClass()
{
FromPoint = new Point() { X = prev.X, Y = prev.Y, SpatialReference = spatialReference },
ToPoint = new Point() { X = v.X, Y = v.Y, SpatialReference = spatialReference },
SpatialReference = spatialReference
});
prev = v;
}
previousEndPoint = discretizedEdge.Last();
}
else if (method == ArcConstructionMethods.Circular)
{
IPoint nearPoint = ((IProximityOperator)aoLineSite).ReturnNearestPoint(aoPointSite, esriSegmentExtension.esriNoExtension);
IPoint midpoint = new PointClass()
{
X = (nearPoint.X + aoPointSite.X) / 2,
Y = (nearPoint.Y + aoPointSite.Y) / 2,
SpatialReference = spatialReference
};
IConstructCircularArc constArc = new CircularArcClass() { SpatialReference = spatialReference };
constArc.ConstructThreePoints(FromPoint, midpoint, ToPoint, false);
ICircularArc arc = (ICircularArc)constArc;
if (!arc.IsMinor)
{
constArc = new CircularArcClass() { SpatialReference = spatialReference };
constArc.ConstructEndPointsRadius(FromPoint, ToPoint, !arc.IsCounterClockwise, arc.Radius, true);
arc = (ICircularArc)constArc;
}
segmentCollection.AddSegment((ISegment)arc);
previousEndPoint = arc.ToPoint;
}
else if (method == ArcConstructionMethods.Ellipse)
{
IPoint nearPoint = ((IProximityOperator)aoLineSite).ReturnNearestPoint(aoPointSite, esriSegmentExtension.esriExtendTangents);
nearPoint.SpatialReference = spatialReference;
ILine lineToFocus = new LineClass() { FromPoint = nearPoint, ToPoint = aoPointSite, SpatialReference = spatialReference };
ILine semiMajor = new LineClass() { SpatialReference = spatialReference };
lineToFocus.QueryTangent(esriSegmentExtension.esriExtendTangentAtTo, 1, true, 100 * lineToFocus.Length, semiMajor);
IPoint center = new PointClass()
{
X = (semiMajor.FromPoint.X + semiMajor.ToPoint.X) / 2,
Y = (semiMajor.FromPoint.Y + semiMajor.ToPoint.Y) / 2,
SpatialReference = spatialReference
};
double minor_length = Math.Sqrt(
Math.Pow(distance(semiMajor.FromPoint, ToPoint) + distance(semiMajor.ToPoint, ToPoint), 2)
- Math.Pow(semiMajor.Length, 2));
IEllipticArc arc = new EllipticArcClass() { SpatialReference = spatialReference };
double rotation = lineToFocus.Angle;
double from = GetAngle(center, FromPoint);
arc.PutCoords(false, center, FromPoint, ToPoint, rotation, minor_length / semiMajor.Length, esriArcOrientation.esriArcMinor);
segmentCollection.AddSegment((ISegment)arc);
previousEndPoint = arc.ToPoint;
}
}
}
}
return segmentCollection;
}