ArcGISEngine实现Style符号样式文件管理工具共5页文档

1．在里实现System.Drawing.Image到stdole.IPicture的相互转换方法，这里就要用到个让人不经意的类System.Windows.Forms.AxHost，通过继承它实现的两个静态方法GetIPictureFromImage()和GetImageFromIPicture()来实现它们之间的相互转换方法，这具很经典吧．．．，方法实现如下： public static stdole.IPictureDisp

GetIPictureFromImage( System.Drawing.Image image ) {

return OleConverter.GetIPictureFromPicture( image ) as stdole.IPictureDisp; }

public static System.Drawing.Image

GetImageFromIPicture( stdole.IPicture pPicture ) {

return OleConverter.GetPictureFromIPicture( pPicture ); }

2．通过修改模板（Gap和Mark）来改变线符号大小：在线符号编辑器功能里有个缩放符号大小的功能，我们可以通过修改线符号的ITemplate来完成这样的功能，这个功能可是我几经尝试才实现，没有功劳，也有苦劳呀！呵呵．． ///

private void ModifyTemplate( ITemplate pTemplate, double dblScale ) {

int patternElementCount = pTemplate.PatternElementCount; if( patternElementCount == 0 ) return;

double[] dblElement = new Double[patternElementCount * 2]; for( int index = 0; index < patternElementCount; index++ ) pTemplate.GetPatternElement( index, out dblElement[index * 2], out dblElement[index * 2 + 1] );

pTemplate.ClearPatternElements();

for( int index = 0; index < patternElementCount; index++ ) pTemplate.AddPatternElement( dblElement[index * 2] * dblScale, dblElement[i

第 1 页

ndex * 2 + 1] * dblScale ); }

就是下图左上角符号预览的缩放功能，这是ArcMap里的样式管理器一样的功能 3．还有就是要重写几个控件了，比如用ListBox显示多层符号的控件了，还有预览符号的PictureBox控件，还有显示字体和索引符号的控件，还有线LineTemplate设置控件（这个控件比较麻烦），当然这些，只要你有点开发方面的基础，应该是没有问题的了！好了！其实这个功能就是内容比较多而已，当你完成第一个符号编辑器后，以后其它符号的实现方法都差不多一样的了！呵呵．．

在做符号管理功能时，对指定符号生成图片是最主要的方法之一，当然在ArcGIS Engine里也提供了丰富的接口来完成这样的功能，结合的GDI+，使完成图片的生成方法更加简单！下面我传上代码的实现，希望能给大家带来一些参考

。。。。

using System;

using System.Drawing; using ESRI.ArcGIS.Display; using ESRI.ArcGIS.Geometry;

namespace StyleConfigManager {

///

public class ClsDrawSymbols {

///

public static Image CreatePictureFromSymbol( ISymbol pSymbol, double dblWidth, double dblHeight, double dblGap) {

Bitmap bitmap = new Bitmap( (int)dblWidth, (int)dblHeight );

Graphics gImage = Graphics.FromImage( bitmap ); IntPtr hdc = new IntPtr(); hdc = gImage.GetHdc();

第 2 页

DrawToDC( hdc.ToInt32(), dblWidth, dblHeight, dblGap, pSymbol, false );

gImage.ReleaseHdc(hdc); gImage.Dispose(); return bitmap; }

///

public static Image CreatePictureFromSymbol( ISymbol pSymbol, double dblWidth,

double dblHeight, double dblGap, bool blnLine ) {

Bitmap bitmap = new Bitmap( (int)dblWidth, (int)dblHeight );

Graphics gImage = Graphics.FromImage( bitmap ); IntPtr hdc = new IntPtr(); hdc = gImage.GetHdc();

DrawToDC( hdc.ToInt32(), dblWidth, dblHeight, dblGap, pSymbol, blnLine );

gImage.ReleaseHdc(hdc); gImage.Dispose(); return bitmap; }

private static void DrawToDC(int hDC, double dblWidth, double dblHeight, double dblGap, ISymbol pSymbol, bool blnLine ) {

IEnvelope pEnvelope = new EnvelopeClass();

pEnvelope.PutCoords(dblGap, dblGap, dblWidth - dblGap, dblHeight - dblGap);

ITransformation pTransformation = CreateTransFromDC(hDC, dblWidth, dblHeight);

IGeometry pGeom = CreateSymShape(pSymbol, pEnvelope, blnLine );

pSymbol.SetupDC(hDC, pTransformation); pSymbol.Draw(pGeom);

第 3 页

pSymbol.ResetDC(); }

private static ITransformation CreateTransFromDC(int hDC, double dblWidth, double dblHeight) {

IEnvelope pBoundsEnvelope = new EnvelopeClass();

pBoundsEnvelope.PutCoords(0, 0, dblWidth, dblHeight);

tagRECT deviceRect = new tagRECT(); deviceRect.left = 0; deviceRect = 0; deviceRect.right

= (int)dblWidth;

deviceRect.bottom =

(int)dblHeight;

IDisplayTransformation pDisplayTransformation = new DisplayTransformationClass();

pDisplayTransformation.VisibleBounds = pBoundsEnvelope; pDisplayTransformation.Bounds = pBoundsEnvelope;

pDisplayTransformation.set_DeviceFrame( ref deviceRect ); pDisplayTransformation.Resolution = 96;

return pDisplayTransformation as ITransformation; }

private static IGeometry CreateSymShape( ISymbol pSymbol, IEnvelope pEnvelope, bool blnLine ) {

if (pSymbol is IMarkerSymbol) {

IArea pArea = pEnvelope as IArea;

return pArea.Centroid; } else if (pSymbol is ILineSymbol || pSymbol is ITextSymbol) {

if( blnLine ) {

IPointCollection pPC = new PolylineClass(); IPoint pPoint = new PointClass(); pPoint.PutCoords( pEnvelope.XMin, pEnvelope.YMax );

第 4 页

object obj = Type.Missing;

pPC.AddPoint( pPoint, ref obj, ref obj ); pPoint = new PointClass();

pPoint.PutCoords( pEnvelope.XMin + pEnvelope.Width / 3

, pEnvelope.YMin );

obj = Type.Missing;

pPC.AddPoint( pPoint, ref obj, ref obj ); pPoint = new PointClass();

pPoint.PutCoords( pEnvelope.XMax - pEnvelope.Width / 3, pEnvelope.YMax );

obj = Type.Missing;

pPC.AddPoint( pPoint, ref obj, ref obj );

pPoint = new PointClass();

pPoint.PutCoords( pEnvelope.XMax, pEnvelope.YMin );

obj = Type.Missing;

pPC.AddPoint( pPoint, ref obj, ref obj );

return pPC as IPolyline; } else {

IPolyline pPolyline = new PolylineClass(); IPoint pFromPoint = new PointClass();

pFromPoint.PutCoords( pEnvelope.XMin, pEnvelope.YMin + pEnvelope.Height / 2 );

IPoint pToPoint = new PointClass(); pToPoint.PutCoords( pEnvelope.XMax, pEnvelope.YMin + pEnvelope.Height / 2 );

pPolyline.FromPoint = pFromPoint; pPolylineoint = pToPoint; return pPolyline;

} } else

return pEnvelope; }

第 5 页

} }

第 6 页