/// <summary>
/// 更新覆盖层
/// </summary>
/// <param name="overlay">覆盖层对象</param>
/// <param name="pshpType">图形类型</param>
/// <param name="points">点集</param>
/// <param name="entityName">实体名（属性值）</param>
private void UpdateOverlay(ref GMapOverlay overlay, Shapelib.ShapeType pshpType, List <PointLatLng> points, string entityName)
{
var pen = new Pen(Color.White);
switch (pshpType)
{
case Shapelib.ShapeType.Point:
var marker = new GMarkerGoogle(points[0], GMarkerGoogleType.orange_dot);
overlay.Markers.Add(marker);
break;
case Shapelib.ShapeType.PolyLine:
var route = new GMapRoute(points, entityName);
pen = new Pen(Color.Red, 3);
route.Stroke = pen;
route.IsHitTestVisible = true;
overlay.Routes.Add(route);
break;
case Shapelib.ShapeType.Polygon:
var polygon = new GMapPolygon(points, entityName);
polygon.Fill = new SolidBrush(Color.FromArgb(20, Color.LightPink));
pen = new Pen(Color.Pink, 3);
pen.DashPattern = new float[] { 2, 3 };
polygon.Stroke = pen;
polygon.IsHitTestVisible = true;
overlay.Polygons.Add(polygon);
break;
}
}
private void OpenLayer(string shpFileName, string xmlFileName = "")
{
var pathName = Path.GetDirectoryName(shpFileName);
var fileName = Path.GetFileNameWithoutExtension(shpFileName);
var shp = string.Format(@"{0}\{1}.shp", pathName, fileName);
var hSHP = Shapelib.SHPOpen(shp, "rb");
var dbf = string.Format(@"{0}\{1}.dbf", pathName, fileName);
var hDBF = Shapelib.DBFOpen(dbf, "rb");
// 实体数
int pnEntities = 0;
// 形状类型
Shapelib.ShapeType pshpType = Shapelib.ShapeType.NullShape;
// 界限坐标数组
double[] adfMinBound = new double[4], adfMaxBound = new double[4];
// 获取实体数、形状类型、界限坐标等信息
Shapelib.SHPGetInfo(hSHP, ref pnEntities, ref pshpType, adfMinBound, adfMaxBound);
var sourceCoordinates = new List <HorizontalCoordinate>();
var targetCoordinates = new List <HorizontalCoordinate>();
if (!string.IsNullOrEmpty(xmlFileName))
{
KVS.Open(xmlFileName, out sourceCoordinates, out targetCoordinates);
}
var param4 = string.IsNullOrEmpty(xmlFileName) ? null : LinearTransformation.GetTransformationParameter(sourceCoordinates, targetCoordinates);
var rect = string.IsNullOrEmpty(xmlFileName) ? GetShapeRect(adfMinBound, adfMaxBound) : GetShapeRect(adfMinBound, adfMaxBound, param4);
var node = new TreeNode(shp);
node.Tag = rect;
node.Checked = true;
node.ExpandAll();
GMapOverlay overlay = new GMapOverlay(shp);
for (int iShape = 0; iShape < pnEntities; iShape++)
{
// SHPObject对象
Shapelib.SHPObject shpObject = new Shapelib.SHPObject();
// 读取SHPObject对象指针
var shpObjectPtr = Shapelib.SHPReadObject(hSHP, iShape);
// 忽略可能存在问题的实体
if (shpObjectPtr == IntPtr.Zero)
{
continue;
}
// 指针转换为SHPObject对象
Marshal.PtrToStructure(shpObjectPtr, shpObject);
// 顶点数
int nVertices = shpObject.nVertices;
// 顶点的X坐标数组
var padfX = new double[nVertices];
// 将顶点的X坐标数组指针转换为数组
Marshal.Copy(shpObject.padfX, padfX, 0, nVertices);
// 顶点的Y坐标数组
var padfY = new double[nVertices];
// 将顶点的Y坐标数组指针转换为数组
Marshal.Copy(shpObject.padfY, padfY, 0, nVertices);
int iField = Shapelib.DBFGetFieldIndex(hDBF, "名称");
string entityName = Shapelib.DBFReadStringAttribute(hDBF, iShape, iField);
// var entityName = Enum.GetName(pshpType.GetType(), pshpType) + iShape;
var points = new List <PointLatLng>();
var entityNode = new TreeNode();
entityNode.Text = entityName;
switch (pshpType)
{
case Shapelib.ShapeType.Point:
var pointMarker = string.IsNullOrEmpty(xmlFileName) ? GetPoint(padfX[0], padfY[0]) : GetTransformedPoint(padfX[0], padfY[0], param4);
points.Add(pointMarker);
UpdateOverlay(ref overlay, pshpType, points, entityName);
entityNode.Tag = overlay.Id;
break;
default:
var minPoint = new PointLatLng();
var maxPoint = new PointLatLng();
for (int i = 0; i < nVertices; i++)
{
var point = string.IsNullOrEmpty(xmlFileName) ? GetPoint(padfX[i], padfY[i]) : GetTransformedPoint(padfX[i], padfY[i], param4);
points.Add(point);
if (i == 0)
{
minPoint.Lat = maxPoint.Lat = point.Lat;
minPoint.Lng = maxPoint.Lng = point.Lng;
}
else
{
if (point.Lng > maxPoint.Lng)
{
maxPoint.Lng = point.Lng;
}
if (point.Lat > maxPoint.Lat)
{
maxPoint.Lat = point.Lat;
}
if (point.Lng < minPoint.Lng)
{
minPoint.Lng = point.Lng;
}
if (point.Lat < minPoint.Lat)
{
minPoint.Lat = point.Lat;
}
}
}
UpdateOverlay(ref overlay, pshpType, points, entityName);
var entityRect = new RectLatLng(maxPoint.Lat, minPoint.Lng, maxPoint.Lng - minPoint.Lng, maxPoint.Lat - minPoint.Lat);
entityNode.Tag = entityRect;
break;
}
node.Nodes.Add(entityNode);
}
Shapelib.DBFClose(hDBF);
Shapelib.SHPClose(hSHP);
m_layerWindow.AddNode(node);
m_mapDocument.AddOverlayer(overlay);
if (pshpType == Shapelib.ShapeType.Point)
{
m_mapDocument.Zoom(overlay.Id);
}
else
{
m_mapDocument.Zoom(rect);
}
}
