我们试图为特定特征层中的所有特征赋予半透明性,同时保留该层中每个特征的样式。
在这种方法中,该Modify()
功能不会受到影响,因此无法正常工作。函数内的代码Modify()
根本没有被执行,根据文章,一旦附加了修饰符就应该调用它。
以下是我们正在使用的代码片段:
Internal class SelectedAreaModifier : FeatureStyleModifier
{
private System.Collections.Hashtable features;
public SelectedAreaModifier(string name, string alias, IResultSetFeatureCollection irfc) : base(name, alias)
{
features = new System.Collections.Hashtable();
string[] exp = new string[] { "MI_KEY" };
this.Expressions = exp;
foreach (Feature f in irfc)
{
features.Add(f.Key.Value, f.Key.Value);
}
}
protected override bool Modify(FeatureStyleStack styles, object[] values)
{
MapInfo.Styles.CompositeStyle cs = styles.Current;
if (features.Contains((values[0] as MapInfo.Data.Key).Value))
{
(cs.AreaStyle.Interior as SimpleInterior).ForeColor = Color.FromArgb((int)(255 * .5), (cs.AreaStyle.Interior as SimpleInterior).ForeColor);
(cs.AreaStyle.Border as SimpleLineStyle).Color = Color.FromArgb((int)(255 * .5),(cs.AreaStyle.Border as SimpleLineStyle).Color);
(cs.AreaStyle.Border as SimpleLineStyle).Width = (cs.AreaStyle.Border as SimpleLineStyle).Width;
return true;
}
return false;
}
}
这个类被用作:
protected void setTranslucency()
{
Map myMap = GetMapObj();
myMap.DrawingAttributes.EnableTranslucency = true;
myMap.DrawingAttributes.SmoothingMode = MapInfo.Mapping.SmoothingMode.AntiAlias;
myMap.DrawingAttributes.SpecialTransparentVectorHandling = false;
FeatureLayer ftrLyr = myMap.Layers["CELL_2G"] as FeatureLayer;
if (ftrLyr.Modifiers["CELL_2G_Translucent"] != null)
ftrLyr.Modifiers.Remove("CELL_2G_Translucent");
MapInfo.Data.MIConnection connection = new MIConnection();
connection.Open();
MapInfo.Data.MICommand command = connection.CreateCommand();
command.CommandText = "select * from CELL_3G";
command.Prepare();
IResultSetFeatureCollection irfc = command.ExecuteFeatureCollection();
SelectedAreaModifier sam = new SelectedAreaModifier("CELL_2G_Translucent", "CELL_2G_Translucent", irfc);
sam.Enabled = true;
ftrLyr.Modifiers.Append(sam);
irfc.Close();
command.Dispose();
connection.Close();
}
任何帮助将不胜感激。
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