/*!
* 功能 过线外一点的发现与已知线交点
* 版本号 1.0
* 作者 樊晓剑
* 创建时间 2016年7月5日
* 参数
* 修改时间
*/
public static Geometry getPoint(Geometry line, Geometry point)
{
int count = line.GetPointCount() - 1;
double k = (line.GetY(count) - line.GetY(0)) / (line.GetX(count) - line.GetX(0));
double b = line.GetY(0) - k * line.GetX(0);
double k1 = -1 / k;
double b1 = point.GetY(0) - k1 * point.GetX(0);
double x = (b1 - b) / (k - k1);
double y = k * x + b;
return(GeometryCreate.createPoint(x, y));
}
private List <Geometry> direct(Layer buildings, Layer sources, Geometry receivePoint, double distance)
{
sources.ResetReading();
double length = 0;
Geometry receiveBuffer = receivePoint.Buffer(distance, 30);
sources.SetSpatialFilter(receiveBuffer);
Feature sFeature = null;
Geometry sourcePoint = null;
Geometry line = null;
Queue <Feature> diffbuildings = new Queue <Feature>();
List <Geometry> geos = new List <Geometry>();
while ((sFeature = sources.GetNextFeature()) != null)
{
sourcePoint = sFeature.GetGeometryRef();
line = GeometryCreate.createLineString3D(sourcePoint.GetX(0), sourcePoint.GetY(0), sourcePoint.GetZ(0), receivePoint.GetX(0), receivePoint.GetY(0), receivePoint.GetZ(0));
buildings.SetSpatialFilter(line);
// List<Geometry> a = getWidth(buildings, sourcePoint, receivePoint, line);
List <Geometry> a = diffractionLine2(buildings, sourcePoint, receivePoint, line);
if (a != null)
// if (buildings.GetFeaturesRead()>0)
{
// geos.AddRange(getWidth(buildings, sourcePoint, receivePoint, line));
geos.AddRange(a);
}
else
{
//计算绕射
// geos.Add(line);
// length += line.Length();
// break;
}
}
//Console.WriteLine(length);
return(geos);
// return length;
}
/// <summary>
/// 寻找一组声线
/// </summary>
/// <param name="buildings">建筑物图层</param>
/// <param name="sourcesPoint">声源点</param>
/// <param name="receivePoint">接收点</param>
/// <param name="range">影响范围</param>
/// <returns>一组声线</returns>
public Geometry[] getPath(Layer buildings, Geometry sourcesPoint, Geometry receivePoint, float range)
{
//构建传播路程的数组，分别为两点直射、上绕射、左绕射、右绕射、反射
Geometry[] pathLength = new Geometry[5];
//构建直达声线
Geometry line = GeometryCreate.createLineString3D(sourcesPoint.GetX(0), sourcesPoint.GetY(0), sourcesPoint.GetZ(0), receivePoint.GetX(0), receivePoint.GetY(0), receivePoint.GetZ(0));
//直达声线长度
// double distance = Distance3D.getPointDistance(sourcesPoint, receivePoint);
//直达声线
pathLength[0] = line;
buildings.SetSpatialFilter(line);//直达声线上受影响的建筑物
//判断是否有直射路径，如果没有，求绕射路径
if (buildings.GetFeatureCount(0) <= 0)
{
//存在直射则不存在绕射
pathLength[1] = null;
pathLength[2] = null;
pathLength[3] = null;
//计算反射
pathLength[4] = line;
}
else
{
Geometry[] diffLine = diffractionLine(buildings, sourcesPoint, receivePoint, line);
pathLength[1] = diffLine[0];
pathLength[2] = diffLine[0];
pathLength[3] = diffLine[0];
//忽略反射
pathLength[4] = null;
}
//计算反射路径
return(pathLength);
}
/// <summary>
/// 绕射声线
/// </summary>
/// <param name="buildingLayer">建筑物图层</param>
/// <param name="sourcePoint">声源点</param>
/// <param name="receivePoint">接收点</param>
/// <param name="line">直达声线</param>
/// <returns>绕射声线</returns>
private Geometry[] diffractionLine(Layer buildingLayer, Geometry sourcePoint, Geometry receivePoint, Geometry line)
{
//左绕射路径点集
SortedList <double, Geometry> leftPoints = new SortedList <double, Geometry>();
//右绕射路径点集
SortedList <double, Geometry> rightPoints = new SortedList <double, Geometry>();
//直达路径方程参数
double k = (sourcePoint.GetY(0) - receivePoint.GetY(0)) / (sourcePoint.GetX(0) - receivePoint.GetX(0));
double b = sourcePoint.GetY(0) - k * sourcePoint.GetX(0);
//最高建筑物
double heighttemp = 0;
Geometry building = null;
Feature bFeature = null;
try
{
//加入起始点
rightPoints.Add(0, sourcePoint);
leftPoints.Add(0, sourcePoint);
while ((bFeature = buildingLayer.GetNextFeature()) != null)
{
Geometry buildingring = bFeature.GetGeometryRef().ConvexHull().GetGeometryRef(0);
double height = bFeature.GetFieldAsDouble("HEIGHT_BU");
//选择最高的建筑物
if (heighttemp < height)
{
building = bFeature.GetGeometryRef();
}
//构建左右绕射点集
for (int i = 0; i < buildingring.GetPointCount() - 1; i++)
{
Geometry point = GeometryCreate.createPoint3D(buildingring.GetX(i), buildingring.GetY(i), height);
if (point.GetY(0) < k * point.GetX(0) + b)
{
rightPoints.Add(sourcePoint.Distance(point), point);
}
else if (buildingring.GetY(i) > k * buildingring.GetX(i) + b)
{
leftPoints.Add(sourcePoint.Distance(point), point);
}
}
}
//加入终点
rightPoints.Add(sourcePoint.Distance(receivePoint), receivePoint);
leftPoints.Add(sourcePoint.Distance(receivePoint), receivePoint);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
Geometry[] diffLine = new Geometry[3];
if (heighttemp <= receivePoint.GetZ(0) || heighttemp <= sourcePoint.GetZ(0))
{
diffLine[0] = null;
diffLine[1] = null;
diffLine[2] = null;
}
else
{
diffLine[0] = getUpdiffLine(building, line, heighttemp);
diffLine[1] = flankdiffLine(leftPoints, line);
diffLine[2] = flankdiffLine(rightPoints, line);
}
return(diffLine);
}
/// <summary>
/// 计算绕射路径长度
/// </summary>
/// <param name="buildingLayer">建筑物图层</param>
/// <param name="sourcePoint">声源点</param>
/// <param name="receivePoint">接收点</param>
/// <param name="line">直达路径</param>
/// <returns>绕射路径长度</returns>
private List <Geometry> diffractionLine2(Layer buildingLayer, Geometry sourcePoint, Geometry receivePoint, Geometry line)
{
List <Geometry> diffLineList = new List <Geometry>();
//绕射声线
Geometry[] diffractionLine = new Geometry[3];
Feature bFeature = null;
//直达声线上的建筑物,并选取最高建筑物
List <Geometry> buildingList = new List <Geometry>();
double buildingheigh = 0;
Geometry buildingtop = null;
while ((bFeature = buildingLayer.GetNextFeature()) != null)
{
if (buildingheigh < bFeature.GetFieldAsDouble("HEIGHT_BU"))
{
buildingtop = bFeature.GetGeometryRef();
}
buildingList.Add(bFeature.GetGeometryRef());
}
if (buildingList.Count > 0)
{
Geometry upLinePoint = new Geometry(wkbGeometryType.wkbMultiPoint);
Geometry belowLinePoint = new Geometry(wkbGeometryType.wkbMultiPoint);
double k = (sourcePoint.GetY(0) - receivePoint.GetY(0)) / (sourcePoint.GetX(0) - receivePoint.GetX(0));
double b = sourcePoint.GetY(0) - k * sourcePoint.GetX(0);
Geometry upLine = new Geometry(wkbGeometryType.wkbLinearRing);
Geometry belowLine = new Geometry(wkbGeometryType.wkbLinearRing);
foreach (Geometry item in buildingList)
{
Geometry buildingring = item.Boundary();
for (int i = 0; i < buildingring.GetPointCount() - 1; i++)
{
Geometry pointb = GeometryCreate.createPoint3D(buildingring.GetX(i), buildingring.GetY(i), buildingring.GetZ(i));
if (pointb.GetY(0) < k * pointb.GetX(0) + b)
{
belowLinePoint.AddGeometry(pointb);
}
else if (buildingring.GetY(i) > k * buildingring.GetX(i) + b)
{
upLinePoint.AddGeometry(pointb);
}
}
SortedList <double, Geometry> sList = new SortedList <double, Geometry>();
if (upLinePoint.GetGeometryCount() > 0)
{
upLine.AddPoint(sourcePoint.GetX(0), sourcePoint.GetY(0), sourcePoint.GetZ(0));
sList.Clear();
for (int i = 0; i < upLinePoint.GetGeometryCount(); i++)
{
sList.Add(sourcePoint.Distance(upLinePoint.GetGeometryRef(i)), upLinePoint.GetGeometryRef(i));
}
foreach (KeyValuePair <double, Geometry> items in sList)
{
upLine.AddPoint(items.Value.GetX(0), items.Value.GetY(0), items.Value.GetZ(0));
}
upLine.AddPoint(receivePoint.GetX(0), receivePoint.GetY(0), receivePoint.GetZ(0));
upLine.CloseRings();
}
if (belowLinePoint.GetGeometryCount() > 0)
{
belowLine.AddPoint(sourcePoint.GetX(0), sourcePoint.GetY(0), sourcePoint.GetZ(0));
sList.Clear();
for (int i = 0; i < belowLinePoint.GetGeometryCount(); i++)
{
sList.Add(sourcePoint.Distance(belowLinePoint.GetGeometryRef(i)), belowLinePoint.GetGeometryRef(i));
}
foreach (KeyValuePair <double, Geometry> items in sList)
{
belowLine.AddPoint(items.Value.GetX(0), items.Value.GetY(0), items.Value.GetZ(0));
}
belowLine.AddPoint(receivePoint.GetX(0), receivePoint.GetY(0), receivePoint.GetZ(0));
belowLine.CloseRings();
}
}
Geometry area;
Geometry diffline;
Geometry convexHull;
if (upLine.GetPointCount() > 3)
{
diffline = new Geometry(wkbGeometryType.wkbLineString);
area = new Geometry(wkbGeometryType.wkbPolygon);
area.AddGeometry(upLine);
convexHull = area.ConvexHull().Boundary();
for (int i = 0; i < convexHull.GetPointCount(); i++)
{
diffline.AddPoint(convexHull.GetX(i), convexHull.GetY(i), convexHull.GetZ(i));
}
diffLineList.Add(diffline.Difference(line));
}
if (belowLine.GetPointCount() > 3)
{
area = new Geometry(wkbGeometryType.wkbPolygon);
area.AddGeometry(belowLine);
convexHull = area.ConvexHull().Boundary();
diffline = new Geometry(wkbGeometryType.wkbLineString);
for (int i = 0; i < convexHull.GetPointCount(); i++)
{
diffline.AddPoint(convexHull.GetX(i), convexHull.GetY(i), convexHull.GetZ(i));
}
diffLineList.Add(diffline.Difference(line));
}
}
return(diffLineList);
}
private List <Geometry> getWidth(Layer buildingLayer, Geometry sourcePoint, Geometry receivePoint, Geometry line)
{
topBuilding st = new topBuilding();
st.width = 0;
st.high = 0;
st.tophigh = null;
st.topwidth = null;
// buildingLayer.ResetReading();
Feature bFeature = null;
OSGeo.OGR.Envelope env = new OSGeo.OGR.Envelope();
while ((bFeature = buildingLayer.GetNextFeature()) != null)
{
bFeature.GetGeometryRef().GetEnvelope(env);
double width = Math.Sqrt((env.MaxX - env.MinX) * (env.MaxX - env.MinX) + (env.MaxY - env.MinY) * (env.MaxY - env.MinY));
if (st.width < width)
{
st.width = width;
st.topwidth = bFeature.GetGeometryRef();
}
if (st.high < bFeature.GetFieldAsDouble("HEIGHT_G"))
{
st.high = bFeature.GetFieldAsDouble("HEIGHT_G");
st.tophigh = bFeature.GetGeometryRef();
}
}
List <Geometry> list = null;
//list.Add(line);
if (st.topwidth != null)
{
list = new List <Geometry>();
SortedDictionary <double, Geometry> upLinePoint = new SortedDictionary <double, Geometry>();
SortedDictionary <double, Geometry> belowLinePoint = new SortedDictionary <double, Geometry>();
double k = (sourcePoint.GetY(0) - receivePoint.GetY(0)) / (sourcePoint.GetX(0) - receivePoint.GetX(0));
double b = sourcePoint.GetY(0) - k * sourcePoint.GetX(0);
Geometry buildingring = new Geometry(wkbGeometryType.wkbLinearRing);
st.topwidth.GetEnvelope(env);
buildingring.AddPoint(env.MinX, env.MinY, 0);
buildingring.AddPoint(env.MaxX, env.MinY, 0);
buildingring.AddPoint(env.MaxX, env.MaxY, 0);
buildingring.AddPoint(env.MinX, env.MaxY, 0);
for (int i = 0; i < buildingring.GetPointCount(); i++)
{
Geometry point = GeometryCreate.createPoint3D(buildingring.GetX(i), buildingring.GetY(i), buildingring.GetZ(i));
if (point.GetY(0) < k * point.GetX(0) + b)
{
belowLinePoint.Add(sourcePoint.Distance(point), point);
}
else if (buildingring.GetY(i) > k * buildingring.GetX(i) + b)
{
upLinePoint.Add(sourcePoint.Distance(point), point);
}
}
Geometry uoLine = new Geometry(wkbGeometryType.wkbLineString);
Geometry belowLine = new Geometry(wkbGeometryType.wkbLineString);
if (upLinePoint.Count > 0)
{
uoLine.AddPoint(sourcePoint.GetX(0), sourcePoint.GetY(0), sourcePoint.GetZ(0));
foreach (KeyValuePair <double, Geometry> item in upLinePoint)
{
uoLine.AddPoint(item.Value.GetX(0), item.Value.GetY(0), item.Value.GetZ(0));
}
uoLine.AddPoint(receivePoint.GetX(0), receivePoint.GetY(0), receivePoint.GetZ(0));
}
if (belowLinePoint.Count > 0)
{
belowLine.AddPoint(sourcePoint.GetX(0), sourcePoint.GetY(0), sourcePoint.GetZ(0));
foreach (KeyValuePair <double, Geometry> item in belowLinePoint)
{
belowLine.AddPoint(item.Value.GetX(0), item.Value.GetY(0), item.Value.GetZ(0));
}
belowLine.AddPoint(receivePoint.GetX(0), receivePoint.GetY(0), receivePoint.GetZ(0));
}
list.Add(uoLine);
list.Add(belowLine);
}
return(list);
}