} //图层的注记风格
#endregion
#region 方法
/// <summary>
/// 构造函数
/// </summary>
public Layer()
{
Name = "new_layer"; //默认名称为‘new_layer’
Visible = true;
IsEdit = false;
FeatureType = typeof(PointD); //默认类型为点
Box = new RectangleD();
Renderer = new SimpleRenderer(FeatureType);
LabelVisible = false;
LabelStyle = new LabelStyle();
Table = new DataTable();
Table.Columns.Add("ID", typeof(int));
SelectedItems = new List <int>();
Features = new List <Geometry>();
}
public Layer(string name, Type type)
{
Name = name;
Visible = true;
IsEdit = false;
FeatureType = type; //默认类型为点
Box = new RectangleD();
Renderer = new SimpleRenderer(FeatureType);
LabelVisible = false;
LabelStyle = new LabelStyle();
Table = new DataTable();
Table.Columns.Add("ID", typeof(int));
SelectedItems = new List <int>();
Features = new List <Geometry>();
}
/// <summary>
/// 简单渲染单个图层
/// </summary>
/// <param name="g"></param>
/// <param name="layer"></param>
private void RenderAsSimpleRenderer(Graphics g, Layer layer)
{
SimpleRenderer sRenderer = layer.Renderer as SimpleRenderer; // 强转，使图层渲染器为唯一值渲染器
//图层类型为点
if (layer.FeatureType == typeof(PointD))
{
PointSymbol pSymbol = sRenderer.Symbol as PointSymbol; //强转，使符号为点符号
for (int i = 0; i < layer.Features.Count; i++)
{
PointD point = layer.Features[i] as PointD;
//转换为屏幕坐标,绘制
PointD screenPoint = FromMapPoint(point);
PointF DrawPoint = new PointF((float)screenPoint.X, (float)screenPoint.Y);
pSymbol.DrawPoint(g, DrawPoint);
}
}
//图层类型为折线
else if (layer.FeatureType == typeof(Polyline))
{
LineSymbol lSymbol = sRenderer.Symbol as LineSymbol; //强转，使符号为线符号
for (int i = 0; i < layer.Features.Count; i++)
{
Polyline line = layer.Features[i] as Polyline; //获得折线
List <PointF> screenLine = new List <PointF>();
for (int j = 0; j < line.Data.Count; j++)
{
PointD point = FromMapPoint(line.Data[j]); //坐标转换
screenLine.Add(new PointF((float)point.X, (float)point.Y)); //添加到绘制队列
}
lSymbol.DrawLine(g, screenLine.ToArray()); //绘制
}
}
//图层类型为复合折线
else if (layer.FeatureType == typeof(MultiPolyline))
{
LineSymbol lSymbol = sRenderer.Symbol as LineSymbol; //强转，使符号为线符号
for (int i = 0; i < layer.Features.Count; i++)
{
MultiPolyline lines = layer.Features[i] as MultiPolyline; //获得复合折线
for (int j = 0; j < lines.Data.Count; j++)
{
Polyline line = lines.Data[j];
List <PointF> screenLine = new List <PointF>();
for (int k = 0; k < line.Data.Count; k++)
{
PointD point = FromMapPoint(line.Data[k]); //坐标转换
screenLine.Add(new PointF((float)point.X, (float)point.Y)); //添加到绘制队列
}
lSymbol.DrawLine(g, screenLine.ToArray()); //绘制
}
}
}
//图层类型为多边形
else if (layer.FeatureType == typeof(Polygon))
{
PolygonSymbol pSymbol = sRenderer.Symbol as PolygonSymbol; //强转，使符号为面符号
for (int i = 0; i < layer.Features.Count; i++)
{
Polygon polygon = layer.Features[i] as Polygon; //获得折线
List <PointF> screenPolygon = new List <PointF>();
for (int j = 0; j < polygon.Data.Count; j++)
{
PointD point = FromMapPoint(polygon.Data[j]); //坐标转换
screenPolygon.Add(new PointF((float)point.X, (float)point.Y)); //添加到绘制队列
}
pSymbol.DrawPolygon(g, screenPolygon.ToArray()); //绘制
}
}
//图层类型为复合多边形
else if (layer.FeatureType == typeof(MultiPolygon))
{
PolygonSymbol pSymbol = sRenderer.Symbol as PolygonSymbol; //强转，使符号为线符号
for (int i = 0; i < layer.Features.Count; i++)
{
MultiPolygon polygons = layer.Features[i] as MultiPolygon; //获得复合折线
for (int j = 0; j < polygons.Data.Count; j++)
{
Polygon polygon = polygons.Data[j];
List <PointF> screenPolygon = new List <PointF>();
for (int k = 0; k < polygon.Data.Count; k++)
{
PointD point = FromMapPoint(polygon.Data[k]); //坐标转换
screenPolygon.Add(new PointF((float)point.X, (float)point.Y)); //添加到绘制队列
}
pSymbol.DrawPolygon(g, screenPolygon.ToArray()); //绘制
}
}
}
}
