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private void AssignColorRamp(string fieldname, List <RiskRankingRange> pRiskRankingRanges)
{
// Get Statistics Values for the Selected Field
GetRankingStatistics(fieldname);
if (_minriskvalue >= _maxriskvalue)
{
return;
}
if (pRiskRankingRanges.Count == 0)
{
return;
}
if (m_styleGalleryItem == null)
{
return;
}
if (m_featureLayer == null)
{
return;
}
m_classBreaksRenderer.Field = fieldname;
m_classBreaksRenderer.BreakCount = pRiskRankingRanges.Count;
m_classBreaksRenderer.MinimumBreak = 0;
//Calculate the class interval by a simple mean value
double interval = (_maxriskvalue - _minriskvalue) / pRiskRankingRanges.Count;
//Get the color ramp
IColorRamp colorRamp = (IColorRamp)m_styleGalleryItem.Item;
//Set the size of the color ramp and recreate it
colorRamp.Size = Convert.ToInt32(pRiskRankingRanges.Count);
bool createRamp;
colorRamp.CreateRamp(out createRamp);
//Get the enumeration of colors from the color ramp
IEnumColors enumColors = colorRamp.Colors;
enumColors.Reset();
double currentBreak = m_classBreaksRenderer.MinimumBreak;
ISimpleLineSymbol simpleLineSymbol;
//Loop through each class break
for (int i = 0; i <= pRiskRankingRanges.Count - 1; i++)
{
//Set class break
m_classBreaksRenderer.set_Break(i, currentBreak);
//Create simple fill symbol and set color
simpleLineSymbol = new SimpleLineSymbolClass();
simpleLineSymbol.Color = enumColors.Next();
//Add symbol to renderer
m_classBreaksRenderer.set_Symbol(i, (ISymbol)simpleLineSymbol);
currentBreak += interval;
}
}
void ClassBreaksRenderer(IFeatureLayer featureLayer)
{
IClassBreaksRenderer classBreaksRenderer = new ClassBreaksRenderer();
classBreaksRenderer.Field = "AREA";
// 必须设置分类数量。
classBreaksRenderer.BreakCount = 4;
classBreaksRenderer.set_Break(0, 744366000);
classBreaksRenderer.set_Break(1, 2049800000);
classBreaksRenderer.set_Break(2, 3801580000);
// 设置填充样式。
IFillSymbol fillSymbol = new SimpleFillSymbol();
fillSymbol.Color = new RgbColor() { Red = 255, Green = 0, Blue = 0 };
classBreaksRenderer.set_Symbol(0, (ISymbol)fillSymbol);
fillSymbol = new SimpleFillSymbol();
fillSymbol.Color = new RgbColor() { Red = 0, Green = 255, Blue = 0 };
classBreaksRenderer.set_Symbol(1, (ISymbol)fillSymbol);
fillSymbol = new SimpleFillSymbol();
fillSymbol.Color = new RgbColor() { Red = 0, Green = 0, Blue = 255 };
classBreaksRenderer.set_Symbol(2, (ISymbol)fillSymbol);
// 图层设置渲染。
var featureRenderer = (IFeatureRenderer)classBreaksRenderer;
var geoFeatureLayer = (IGeoFeatureLayer)featureLayer;
geoFeatureLayer.Renderer = featureRenderer;
}
public void ApplyClsssBreaks(IGeoFeatureLayer geoLayer, string aFieldName, long numBreaks)
{
//Create a Table from the geofeature layer
ITable table = geoLayer as ITable;
//ITableHistogram tableHistogram=new TableHistogram(); that is error but canbe coded by following
TableHistogram tableHistogram2 = new TableHistogram();
ITableHistogram tableHistogram = tableHistogram2 as ITableHistogram;
tableHistogram.Table = table;
tableHistogram.Field = aFieldName;
IHistogram histogram = tableHistogram as IHistogram;
object vValues;
object vFregs;
//先统计每个值和各个值出现的次数
histogram.GetHistogram(out vValues, out vFregs);
//Classify the data
IClassifyGEN classifyGEN = new EqualInterval();
int intBreaks = Convert.ToInt32(numBreaks);
classifyGEN.Classify(vValues, vFregs, ref intBreaks);
double[] vBreaks = (double[])classifyGEN.ClassBreaks;
//books
int classCount = vBreaks.GetUpperBound(0);
//Create the ClassBreaksRenderer
IClassBreaksRenderer classBreaksRenderer = new ClassBreaksRenderer();
//assigh a field as breaked
classBreaksRenderer.Field = aFieldName;
//passed as a string to the sub routine
//classBreaksRenderer.BreakCount =classCount;
classBreaksRenderer.BreakCount = (int)(numBreaks);
classBreaksRenderer.SortClassesAscending = false;
IRgbColor fromColor = new RgbColor();
fromColor.UseWindowsDithering = true;
fromColor.RGB = Information.RGB(0, 0, 255);
IRgbColor toColor = new RgbColor();
toColor.UseWindowsDithering = true;
toColor.RGB = Information.RGB(255, 0, 0);
//Set up the fill symbol
ISymbol pSym;
//ISimpleFillSymbol sym = new SimpleFillSymbol();
IColor fillColor;
MessageBox.Show("vBreaks.Length: " + vBreaks.Length.ToString());
IEnumColors colors = GetColors(fromColor.RGB, toColor.RGB, numBreaks);
for (int i = 0; i <= (vBreaks.Length - 2); i++)
{
fillColor = colors.Next();
//code by jin
if (geoLayer.FeatureClass.ShapeType == esriGeometryType.esriGeometryPolygon)
{
ISimpleFillSymbol sym = new SimpleFillSymbol();
sym.Color = fillColor;
pSym = sym as ISymbol;
}
else if (geoLayer.FeatureClass.ShapeType == esriGeometryType.esriGeometryPolyline)
{
ISimpleLineSymbol sym = new SimpleLineSymbol();
sym.Color = fillColor;
pSym = sym as ISymbol;
}
else
{
ISimpleMarkerSymbol sym = new SimpleMarkerSymbol();
sym.Color = fillColor;
pSym = sym as ISymbol;
}
classBreaksRenderer.set_Break(i, vBreaks[i + 1]);
classBreaksRenderer.set_Symbol(i, pSym);
geoLayer.Renderer = classBreaksRenderer as IFeatureRenderer;
axMapControl1.ActiveView.Refresh();
axTOCControl1.Update();
}
}
