/// <summary>
/// 根据在屏幕中划定的范围搜索shapes
/// </summary>
/// <param name="screenLeft">相对屏幕的左坐标点</param>
/// <param name="screenRight">相对屏幕的右坐标点</param>
/// <param name="screenTop">相对屏幕的顶部坐标点</param>
/// <param name="screenBottom">相对屏幕的底部坐标点</param>
/// <param name="ctrlDown"></param>
/// <returns></returns>
internal MapWinGIS.Interfaces.SelectInfo SelectShapesByRectangle(int screenLeft, int screenRight, int screenTop, int screenBottom, bool ctrlDown = false)
{
if (Program.frmMain.Legend.SelectedLayer == -1)
{
return(null);
}
Interfaces.eLayerType type = Program.frmMain.Layers[Program.frmMain.Layers.CurrentLayer].LayerType;
if (type == Interfaces.eLayerType.Grid || type == Interfaces.eLayerType.Image || type == Interfaces.eLayerType.Invalid)
{
return(null);
}
MapWinGIS.Shapefile sf = (MapWinGIS.Shapefile)(Program.frmMain.MapMain.get_GetObject(Program.frmMain.Layers.CurrentLayer));
double geoL = 0, geoR = 0, geoT = 0, geoB = 0;
Program.frmMain.MapMain.PixelToProj(screenLeft, screenTop, ref geoL, ref geoT);
Program.frmMain.MapMain.PixelToProj(screenRight, screenBottom, ref geoR, ref geoB);
MapWinGIS.Extents bounds = new MapWinGIS.Extents();
bounds.SetBounds(geoL, geoB, 0, geoR, geoT, 0);
if (ctrlDown)
{
m_SelectionOperation = Interfaces.SelectionOperation.SelectAdd;
}
else
{
m_SelectionOperation = Interfaces.SelectionOperation.SelectNew;
}
return(PerformSelection(sf, bounds, 0.0D));
}
/// <summary>
/// 根据给定的点搜索shape
/// </summary>
/// <param name="screenX">屏幕x坐标</param>
/// <param name="screenY">屏幕y坐标</param>
/// <param name="ctrlDown">Ctrl按钮是否按下</param>
/// <returns></returns>
internal MapWinGIS.Interfaces.SelectInfo SelectShapesByPoint(int screenX, int screenY, bool ctrlDown = false)
{
if (Program.frmMain.Legend.SelectedLayer == -1)
{
return(null);
}
double x = 0, y = 0;
PixelToProj(screenX, screenY, ref x, ref y);
MapWinGIS.Extents bounds = new MapWinGIS.Extents();
bounds.SetBounds(x, y, 0, x, y, 0);
Interfaces.eLayerType type = Program.frmMain.m_Layers[Program.frmMain.Layers.CurrentLayer].LayerType;
if (type == Interfaces.eLayerType.Grid || type == Interfaces.eLayerType.Image || type == Interfaces.eLayerType.Invalid)
{
return(null);
}
object obj = Program.frmMain.MapMain.get_GetObject(Program.frmMain.Layers.CurrentLayer);
MapWinGIS.Shapefile sf = (MapWinGIS.Shapefile)obj;
//计算容差
double tolerance = m_SelectionTolerance;
if (tolerance == 0) //容差
{
if (((sf.ShapefileType == ShpfileType.SHP_POLYGON) || (sf.ShapefileType == ShpfileType.SHP_POLYGONM)) || (sf.ShapefileType == ShpfileType.SHP_POLYGONZ))
{
tolerance = 0.0D;
}
else if (((sf.ShapefileType == ShpfileType.SHP_POINT) || (sf.ShapefileType == ShpfileType.SHP_POINTM)) || (sf.ShapefileType == ShpfileType.SHP_POINTZ))
{
double x1 = 0, y1 = 0;
int size = (int)(sf.DefaultDrawingOptions.PointSize / 2);
PixelToProj(screenX + size, screenY + size, ref x1, ref y1);
tolerance = System.Math.Sqrt(Math.Pow((x - x1), 2) + Math.Pow((y - y1), 2));
}
else
{
double x1 = 0, y1 = 0;
PixelToProj(screenX + 5, screenY + 5, ref x1, ref y1);
tolerance = System.Convert.ToDouble(Math.Sqrt(Math.Pow((x - x1), 2) + Math.Pow((y - y1), 2)));
}
}
if (ctrlDown) //选择模式
{
m_SelectionOperation = Interfaces.SelectionOperation.SelectAdd;
}
else
{
m_SelectionOperation = Interfaces.SelectionOperation.SelectNew;
}
//处理选择的shape
return(PerformSelection(sf, bounds, tolerance));
}
