参考代码1
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private
void
分级渲染ToolStripMenuItem_Click(
object
sender, EventArgs e)
{
//值分级
IBasicHistogram pBasicHis =
new
BasicTableHistogramClass();
ITableHistogram pTabHis = (ITableHistogram)pBasicHis;
pTabHis.Field =
"w1"
;
ITable pTab = (ITable)axMapControl1.get_Layer(0);
pTabHis.Table = pTab;
object
doubleArrVal, longArrFreq;
pBasicHis.GetHistogram(
out
doubleArrVal,
out
longArrFreq);
IClassifyGEN pClassify =
new
EqualIntervalClass();
//NaturalBreaksClass
int
nDes = 5;
pClassify.Classify(doubleArrVal, longArrFreq,
ref
nDes);
object
classes = pClassify.ClassBreaks;
System.Array pArr = (System.Array)classes;
//算法梯度颜色
IAlgorithmicColorRamp pAlgoColorRamp =
new
AlgorithmicColorRampClass();
pAlgoColorRamp.Size = pArr.Length;
IRgbColor pFromColor =
new
RgbColorClass(), pToColor =
new
RgbColorClass();
pFromColor.Red = 0;
pFromColor.Green = 255;
pFromColor.Blue = 0;
pToColor.Red = 255;
pToColor.Green = 0;
pToColor.Blue = 255;
pAlgoColorRamp.FromColor = pFromColor;
pAlgoColorRamp.ToColor = pToColor;
bool
ok =
true
;
pAlgoColorRamp.CreateRamp(
out
ok);
//颜色梯度结束
IClassBreaksRenderer pRender =
new
ClassBreaksRendererClass();
pRender.BreakCount = pArr.Length;
pRender.Field =
"w1"
;
ISimpleFillSymbol pSym;
for
(
int
i = 0; i < pArr.Length; i++)
{
pRender.set_Break(i, (
double
)pArr.GetValue(i));
pSym =
new
SimpleFillSymbolClass();
pSym.Color = pAlgoColorRamp.get_Color(i);
pRender.set_Symbol(i, (ISymbol)pSym);
}
IGeoFeatureLayer pGeoLyr = (IGeoFeatureLayer)axMapControl1.get_Layer(0);
pGeoLyr.Renderer = (IFeatureRenderer)pRender;
axMapControl1.Refresh();
axTOCControl1.Update();
}
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参考代码2
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private
void
分层设色ToolStripMenuItem_Click(
object
sender, EventArgs e)
{
//获取当前图层 ，并把它设置成IGeoFeatureLayer的实例
IMap pMap = axMapControl1.Map;
ILayer pLayer = pMap.get_Layer(0)
as
IFeatureLayer;
IFeatureLayer pFeatureLayer = pLayer
as
IFeatureLayer;
IGeoFeatureLayer pGeoFeatureLayer = pLayer
as
IGeoFeatureLayer;
//获取图层上的feature
IFeatureClass pFeatureClass = pFeatureLayer.FeatureClass;
IFeatureCursor pFeatureCursor = pFeatureClass.Search(
null
,
false
);
IFeature pFeature = pFeatureCursor.NextFeature();
//
IFeatureRenderer PR=pGeoFeatureLayer.Renderer;<br>
//JoinData("县级区域", "DZGB", "sectioncode"); //join外部表
// int DC ;
int
desiredClasses = 5;
string
fieldName =
"w1"
;
int
classesCount;
double
[] classes;
string
strOutput =
""
;
bool
ok;
object
dataFrequency;
object
dataValues;
ITable pTable ;
//IClassify pClassify;
EqualIntervalClass pClassify;
//IBasicHistogram pTableHistogram = new BasicTableHistogramClass();
//IHistogram pTableHistogram = new BasicTableHistogramClass();
ITableHistogram pTableHistogram =
new
BasicTableHistogramClass()
as
ITableHistogram;
IBasicHistogram pHistogram;
IClassBreaksRenderer pClassBreaksRenderer;
IHsvColor pFromColor;
IHsvColor pToColor;
IAlgorithmicColorRamp pAlgorithmicColorRamp;
IEnumColors pEnumColors;
IColor pColor;
ISimpleFillSymbol pSimpleFillSymbol;
pLayer = (IFeatureLayer)axMapControl1.get_Layer(0);
pGeoFeatureLayer = (IGeoFeatureLayer)pLayer;
pTable = (ITable)pGeoFeatureLayer;
pHistogram = (IBasicHistogram)pTableHistogram;
// Get values and frequencies for the field
pTableHistogram.Field = fieldName;
pTableHistogram.Table = pTable;
pHistogram.GetHistogram(
out
dataValues,
out
dataFrequency);
// Put values and frequencies into an Equal Interval Classify Object
pClassify =
new
EqualIntervalClass();
//pClassify = new NaturalBreaksClass();
pClassify.SetHistogramData(dataValues, dataFrequency);
pClassify.Classify(dataValues, dataFrequency,
ref
desiredClasses);
//pClassify.Classify(ref desiredClasses);
classes = (
double
[])pClassify.ClassBreaks;
classesCount = classes.Length;
// Initialise a new Class Breaks renderer
// Supply the number of Class Breaks and the field to perform. the class breaks on
pClassBreaksRenderer =
new
ClassBreaksRendererClass();
pClassBreaksRenderer.Field = fieldName;
pClassBreaksRenderer.BreakCount = classesCount;
pClassBreaksRenderer.SortClassesAscending =
true
;
// Use algorithmic color ramp to generate an range of colors between YELLOW to RED
// Initial color: YELLOW
pFromColor =
new
HsvColorClass();
pFromColor.Hue = 60;
pFromColor.Saturation = 100;
pFromColor.Value = 96;
// Final color: RED
pToColor =
new
HsvColorClass();
pToColor.Hue = 0;
pToColor.Saturation = 100;
pToColor.Value = 96;
// Set up HSV Color ramp to span from YELLOW to RED
pAlgorithmicColorRamp =
new
AlgorithmicColorRampClass();
pAlgorithmicColorRamp.Algorithm = esriColorRampAlgorithm.esriHSVAlgorithm;
pAlgorithmicColorRamp.FromColor = pFromColor;
pAlgorithmicColorRamp.ToColor = pToColor;
pAlgorithmicColorRamp.Size = classesCount;
pAlgorithmicColorRamp.CreateRamp(
out
ok);
pEnumColors = pAlgorithmicColorRamp.Colors;
for
(
int
index = 0; index < classesCount - 1; index++)
{
pColor = pEnumColors.Next();
pSimpleFillSymbol =
new
SimpleFillSymbolClass();
pSimpleFillSymbol.Color = pColor;
pSimpleFillSymbol.Style = esriSimpleFillStyle.esriSFSSolid;
pClassBreaksRenderer.set_Symbol(index, (ISymbol)pSimpleFillSymbol);
pClassBreaksRenderer.set_Break(index, classes[index + 1]);
// Store each break value for user output
strOutput +=
"-"
+ classes[index + 1] +
"\n"
;
}
pGeoFeatureLayer.Renderer = (IFeatureRenderer)pClassBreaksRenderer;
//this.axMapControl1.Refresh();<br>
/////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////
//get the custom property from which is supposed to be the layer to be saved
object
customProperty =
null
;
//IMapControl3 mapControl = null;
customProperty = axMapControl1.CustomProperty;
//ask the user to set a name for the new layer file
SaveFileDialog saveFileDialog =
new
SaveFileDialog();
saveFileDialog.Filter =
"Layer File|*.lyr|All Files|*.*"
;
saveFileDialog.Title =
"生成专题图"
;
saveFileDialog.RestoreDirectory =
true
;
saveFileDialog.FileName = System.IO.Path.Combine(saveFileDialog.InitialDirectory, pGeoFeatureLayer.Name +
".lyr"
);
//get the layer name from the user
DialogResult dr = saveFileDialog.ShowDialog();
if
(saveFileDialog.FileName !=
""
&& dr == DialogResult.OK)
{
if
(System.IO.File.Exists(saveFileDialog.FileName))
{
//try to delete the existing file
System.IO.File.Delete(saveFileDialog.FileName);
}
//create a new LayerFile instance
ILayerFile layerFile =
new
LayerFileClass();
//create a new layer file
layerFile.New(saveFileDialog.FileName);
//attach the layer file with the actual layer
layerFile.ReplaceContents((ILayer)pGeoFeatureLayer);
//save the layer file
layerFile.Save();
//ask the user whether he'd like to add the layer to the map
if
(DialogResult.Yes == MessageBox.Show(
"Would you like to add the layer to the map?"
,
"Message"
, MessageBoxButtons.YesNo,MessageBoxIcon.Question))
{
axMapControl1.AddLayerFromFile(saveFileDialog.FileName, 0);
}
}
IActiveView pActiveView = axMapControl1.Map
as
IActiveView;
pActiveView.Refresh();
axTOCControl1.Update();
}
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参考代码3
View Code
参考代码4
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本文转自wenglabs博客园博客，原文链接：http://www.cnblogs.com/arxive/p/5903535.html，如需转载请自行联系原作者
