单值专题图（有颜色带）

using System;
using System.Windows.Forms;
using System.Drawing;
using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Controls;
using ESRI.ArcGIS.Display;
using ESRI.ArcGIS.esriSystem;
using ESRI.ArcGIS.SystemUI;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.Output;
namespace DXGXGIS.MainGIS
{
public class ComboBoxEx : ComboBox
{
public  ComboBoxEx()
{
DrawMode = DrawMode.OwnerDrawFixed;
DropDownStyle = ComboBoxStyle.DropDownList;
}
protected override void OnDrawItem(DrawItemEventArgs e)
{
e.DrawBackground();
e.DrawFocusRectangle();
try
{
//显示图片
Image image = (Image)Items[e.Index];
System.Drawing.Rectangle rect = e.Bounds;
e.Graphics.DrawImage(image, rect);
}
catch
{
if (e.Index != -1)
{
//不是图片则显示字符
e.Graphics.DrawString(Items[e.Index].ToString(), e.Font, new SolidBrush(e.ForeColor), e.Bounds.X, e.Bounds.Y);
}
}
finally
{
base.OnDrawItem(e);
}
}
}
}

private void InitialCombobox(ComboBoxEx pStyleCombox)
{
try
{
isStyle = true;
this.cboStyle.Visible = true;
this.uiGroupBox3.Visible = true;
IStyleGallery pStyleGallery;
IStyleGalleryStorage pStyleStorage;
IEnumStyleGalleryItem enumStyleGalleryItem;
IStyleGalleryItem styleItem;
IStyleGalleryClass pStyleGalleryClass = new ColorRampStyleGalleryClassClass();
pStyleGallery = new ServerStyleGalleryClass();
pStyleStorage = pStyleGallery as IStyleGalleryStorage;
string stylePath = Application.StartupPath + @"/ESRI.ServerStyle";
pStyleStorage.AddFile(stylePath);
enumStyleGalleryItem = pStyleGallery.get_Items("Color Ramps", "ESRI.ServerStyle", "");
enumStyleGalleryItem.Reset();
styleItem = enumStyleGalleryItem.Next();
while (styleItem != null)
{
Bitmap bitmap = PreviewSymbol(pStyleGalleryClass, styleItem.Item, pStyleCombox.Width, pStyleCombox.Height);
pStyleCombox.Items.Add(bitmap);
styleGalleryItem.Add(styleItem);
styleItem = enumStyleGalleryItem.Next();
}
System.Runtime.InteropServices.Marshal.ReleaseComObject(enumStyleGalleryItem);
}
catch (Exception ee)
{
//MessageBox.Show(ee.ToString(), "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
this.cboStyle.Visible = false;
this.uiGroupBox3.Visible = false;
isStyle = false;
}
}
//Symbol转换为Bitmap;
private Bitmap PreviewSymbol(IStyleGalleryClass pStyleGalleryClass, object galleryItem, int imgWidth, int imgHeight)
{
Bitmap bitmap = new Bitmap(imgWidth, imgHeight);
Graphics graphics = Graphics.FromImage(bitmap);
tagRECT rect = new tagRECT();
rect.right = bitmap.Width;
rect.bottom = bitmap.Height;
System.IntPtr hdc = graphics.GetHdc();
pStyleGalleryClass.Preview(galleryItem, hdc.ToInt32(), ref rect);
graphics.ReleaseHdc(hdc);
graphics.Dispose();
return bitmap;
}
/// <summary>
/// 实现将Symbol转换为Bitmap
/// </summary>
/// <param name="Symbol">符号对象</param>
/// <param name="Width">宽度值</param>
/// <param name="Height">高度值</param>
/// <returns>图像对象</returns>
public static Bitmap PreviewItem(ISymbol Symbol, int Width, int Height)
{
Bitmap bitmap = new Bitmap(Width, Height);
Graphics mGraphics = Graphics.FromImage(bitmap);
double dpi = mGraphics.DpiY;
IEnvelope pEnvelope = new EnvelopeClass();
pEnvelope.PutCoords(0, 0, bitmap.Width, bitmap.Height);
tagRECT myRect = new tagRECT();
myRect.bottom = bitmap.Height;
myRect.left = 0;
myRect.right = bitmap.Width;
myRect.top = 0;
IDisplayTransformation pDisplayTransformation = new DisplayTransformationClass();
pDisplayTransformation.VisibleBounds = pEnvelope;
pDisplayTransformation.Bounds = pEnvelope;
pDisplayTransformation.set_DeviceFrame(ref myRect);
pDisplayTransformation.Resolution = dpi;
IntPtr pIntPtr = mGraphics.GetHdc();
int hDC = pIntPtr.ToInt32();
Symbol.SetupDC(hDC, pDisplayTransformation);
IGeometry pGeometry = GetSymbolGeometry(Symbol, pEnvelope);
Symbol.Draw(pGeometry);
Symbol.ResetDC();
mGraphics.ReleaseHdc(pIntPtr);
mGraphics.Dispose();
return bitmap;
}
/// <summary>
/// 根据符号类型得到相应的几何形体
/// </summary>
/// <param name="Symbol">符号对象</param>
/// <param name="Envelop">矩形对象</param>
/// <returns>几何形体对象</returns>
private static IGeometry GetSymbolGeometry(ISymbol Symbol, IEnvelope Envelop)
{
IGeometry pGeometry = null;
if (Symbol is IMarkerSymbol)
{
IArea pArea = Envelop as IArea;
pGeometry = pArea.Centroid;
}
else if (Symbol is ILineSymbol)
{
IPolyline pPolyline = new PolylineClass();
IPoint pFromPoint = new PointClass();
pFromPoint.PutCoords(Envelop.XMin, (Envelop.YMax + Envelop.YMin)/2);
IPoint pToPoint = new PointClass();
pToPoint.PutCoords(Envelop.XMax, (Envelop.YMax + Envelop.YMin)/2);
pPolyline.FromPoint = pFromPoint;
pPolyline.ToPoint = pToPoint;
pGeometry = pPolyline;
}
else if (Symbol is IFillSymbol)
{
pGeometry = Envelop;
}
else if (Symbol is ITextSymbol)
{
IArea pArea = Envelop as IArea;
pGeometry = pArea.Centroid;
}
return pGeometry;
}

this.lstViewShow.Items.Clear();
imagelist.Images.Clear();
ITable pTable;
int fieldNumber;
string strFieldName = this.cboField.Text;
ILayer pLayer = pFLayer as ILayer;
pTable = (ITable)pLayer;
fieldNumber = pTable.FindField(strFieldName);
if (fieldNumber == -1)
{
MessageBox.Show("没有查找到结果，请选择别的字段查询!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}
IUniqueValueRenderer pUniqueValueRenderer = new UniqueValueRendererClass();
pUniqueValueRenderer.FieldCount = 1;
pUniqueValueRenderer.set_Field(0, strFieldName);
object codeValue;
bool ok;
IColorRamp colorRamp = (IColorRamp)styleGalleryItem[this.cboStyle.SelectedIndex].Item;
colorRamp.CreateRamp(out ok);
IEnumColors pEnumRamp = colorRamp.Colors;
IQueryFilter pQueryFilter = new QueryFilterClass();
pQueryFilter.AddField(strFieldName);
ICursor pCursor = pTable.Search(pQueryFilter, true);
IRow pNextRow = pCursor.NextRow();
IMarkerSymbol pMarkerSymbol;
ILineSymbol pLineSymbol;
IFillSymbol pFillSymbol;
IColor pNextUniqueColor = null;
ArrayList count = new ArrayList();
List<Bitmap> symbol = new List<Bitmap>();
int unqueValueCount = 0;
if (pNextRow != null)
{
int fieldIndex = pNextRow.Fields.FindField(strFieldName);
do
{
codeValue = pNextRow.get_Value(fieldIndex);
pNextUniqueColor = pEnumRamp.Next();
if (pNextUniqueColor == null)
{
pEnumRamp.Reset();
pNextUniqueColor = pEnumRamp.Next();
}
switch (pFLayer.FeatureClass.ShapeType)
{
case esriGeometryType.esriGeometryPoint:
pMarkerSymbol = new SimpleMarkerSymbolClass();
pMarkerSymbol.Color = pNextUniqueColor;
pMarkerSymbol.Size = Convert.ToInt32(this.cboSize.Text);
pUniqueValueRenderer.AddValue(codeValue.ToString(), this.cboField.Text, (ISymbol)pMarkerSymbol);
break;
case esriGeometryType.esriGeometryPolyline:
pLineSymbol = new SimpleLineSymbolClass();
pLineSymbol.Color = pNextUniqueColor;
pLineSymbol.Width = Convert.ToInt32(this.cboSize.Text);
pUniqueValueRenderer.AddValue(codeValue.ToString(), this.cboField.Text, (ISymbol)pLineSymbol);
break;
case esriGeometryType.esriGeometryPolygon:
pFillSymbol = new SimpleFillSymbolClass();
pFillSymbol.Color = pNextUniqueColor;
pUniqueValueRenderer.AddValue(codeValue.ToString(), this.cboField.Text, (ISymbol)pFillSymbol);
break;
}
pNextRow = pCursor.NextRow();
} while (pNextRow != null);
}
unqueValueCount = pUniqueValueRenderer.ValueCount;
if (unqueValueCount > 500)
{
unqueValueCount = 500;
MessageBox.Show("为不影响执行效率，查询值只显示前500条!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
for (int j = 0; j < unqueValueCount; j++)
{
count.Add(pUniqueValueRenderer.get_Value(j).ToString());
string xv = pUniqueValueRenderer.get_Value(j);
if (xv != "")
{
switch (pFLayer.FeatureClass.ShapeType)
{
case esriGeometryType.esriGeometryPoint:
IMarkerSymbol pNextSymbol1 = (IMarkerSymbol)pUniqueValueRenderer.get_Symbol(xv);
symbol.Add(PreviewItem((ISymbol)pNextSymbol1, 20, 20));
break;
case esriGeometryType.esriGeometryPolyline:
ILineSymbol pNextSymbol2 = (ILineSymbol)pUniqueValueRenderer.get_Symbol(xv);
symbol.Add(PreviewItem((ISymbol)pNextSymbol2, 80, 20));
break;
case esriGeometryType.esriGeometryPolygon:
IFillSymbol pNextSymbol3 = (IFillSymbol)pUniqueValueRenderer.get_Symbol(xv);
symbol.Add(PreviewItem((ISymbol)pNextSymbol3, 20, 20));
break;
}
}
imagelist.Images.Add(symbol[j]);
lstViewShow.SmallImageList = imagelist;
ListViewItem lvi = new ListViewItem(new string[] { "", count[j].ToString(), count[j].ToString() });
lvi.ImageIndex = j;
lstViewShow.Items.Add(lvi);
}
IGeoFeatureLayer m_pGeoFeatureLayer = (IGeoFeatureLayer)pLayer;
m_pGeoFeatureLayer.Renderer = (IFeatureRenderer)pUniqueValueRenderer;
mainfrm.axTOCControl.SetBuddyControl(mainfrm.axMapControl.Object);
mainfrm.axTOCControl.Refresh();
mainfrm.axMapControl.ActiveView.Refresh();
symbol.Clear();