/// <summary>
/// 用指定填充颜色和边线颜色渲染图层
/// </summary>
/// <param name="geoLayer">图层</param>
/// <param name="mainColor">主颜色，即面图层的填充颜色，线图层的线条颜色，点图层的符号内部颜色</param>
/// <param name="outlineColor">面或点的边线颜色，若为null，则设置边线颜色为RGB：128, 138, 135</param>
/// <param name="transparency">图层的透明度，0为不透明，100为全透明</param>
/// <param name="widthOrSize">面/线图层的线宽，或点图层点的大小</param>
public static void SetSimpleRenderer(this IGeoFeatureLayer geoLayer, IColor mainColor, IColor outlineColor = null, short transparency = 0, double widthOrSize = 1)
{
ISymbol symbol = null;
switch (geoLayer.FeatureClass.ShapeType)
{
case esriGeometryType.esriGeometryPolygon:
symbol = (ISymbol)SymbolCreate.GetSimpleFillSymbol(mainColor, outlineColor, widthOrSize);
break;
case esriGeometryType.esriGeometryPoint:
case esriGeometryType.esriGeometryMultipoint:
symbol = (ISymbol)SymbolCreate.GetSimpleMarkerSymbol(mainColor, outlineColor, widthOrSize);
break;
case esriGeometryType.esriGeometryLine:
case esriGeometryType.esriGeometryPolyline:
symbol = (ISymbol)SymbolCreate.GetSimpleLineSymbol(mainColor, widthOrSize);
break;
}
geoLayer.Renderer = new SimpleRendererClass {
Symbol = symbol
};
ILayerEffects layerEffects = (ILayerEffects)geoLayer;
layerEffects.Transparency = transparency;
}
/// <summary>
/// ClassBreakRender分级渲染：根据数字字段的值分组渲染图层
/// </summary>
/// <param name="geoFeatureLayer">操作图层</param>
/// <param name="fieldName">操作字段名</param>
/// <param name="breakCount">分级数量</param>
/// <param name="outLineColor">分组符号的外框颜色</param>
public static void SetClassBreakRenderer(this IGeoFeatureLayer geoFeatureLayer, string fieldName, int breakCount, IColor outLineColor)
{
//获取该字段的最大值、最小值
var statisticsResults = geoFeatureLayer.FeatureClass.Statistics(fieldName, null);
double max = statisticsResults.Maximum;
double min = statisticsResults.Minimum;
//设置分级数，字段
IClassBreaksRenderer cbRender = new ClassBreaksRendererClass();
cbRender.MinimumBreak = min; //最小值
cbRender.Field = fieldName; //分级字段
cbRender.BreakCount = breakCount; //分级数量
//设置每一级的分段范围，符号
var lineSymbol = SymbolCreate.GetSimpleLineSymbol(outLineColor);//新建边线符号
for (int i = 0; i < breakCount; i++)
{
var color = ColorCreate.GetIColor(0, 250 / breakCount * (breakCount - i), 0);
cbRender.set_Break(i, (max - min) * (i + 1) / breakCount + min);
cbRender.set_Symbol(i, new SimpleFillSymbolClass {
Outline = lineSymbol, Color = color
});
}
geoFeatureLayer.Renderer = (IFeatureRenderer)cbRender;
}
/// <summary>
/// 获取默认符号
/// </summary>
/// <param name="geometryType"></param>
/// <param name="color"></param>
/// <returns></returns>
private static ISymbol GetDefaultSymbol(esriGeometryType geometryType, IColor color)
{
switch (geometryType)
{
case esriGeometryType.esriGeometryLine:
case esriGeometryType.esriGeometryPolyline:
return(SymbolCreate.GetSimpleLineSymbol(color, 3) as ISymbol);
case esriGeometryType.esriGeometryPoint:
return(SymbolCreate.GetSimpleMarkerSymbol(color, null, 6, esriSimpleMarkerStyle.esriSMSCircle) as ISymbol);
case esriGeometryType.esriGeometryPolygon:
return(SymbolCreate.GetSimpleFillSymbol(color) as ISymbol);
}
return(null);
}