Symbol对象

　　GIS中的离散实体有三种：点、线、面，在ArcEngine中用三种符号对应表示，分别是：MarkSymbol、LineSymbol和FillSymbol。此外还有TextSymbol用于文字标注，3DChart用来显示饼图等三维对象。

　　所有符号都实现ISymbol和IMapLevel接口，ISymbol定义一个符号对象的基本属性和方法，IMapLevel定义属性可以确定符号显示的图层，和图层类似，用于确定符号的叠加顺序。

一、MarkerSymbol对象

　　MarkerSymbol对象用于修饰点对象符号，拥有12个子类：

Classes	Description
ArrowMarkerSymbol	箭头形式符号，箭头的样式只有一个：esriAMSPlain
BarChartSymbol	Defines a bar chart symbol.
CharacterMarker3DSymbol (3DAnalyst)	3D Character Marker Symbol component.
CharacterMarkerSymbol	字符形式符号，用于将一个点要素显示为字符状。Characterindex属性用来确定显示的字符
Marker3DSymbol (3DAnalyst)	3D Marker Symbol component.
MultiLayerMarkerSymbol	使用多个符号进行叠加生成新符号。
PictureMarkerSymbol	以图片为背景的符号，把一个点对象的外形表示为一个位图，可以指定Picture或者使用CreateMarkSymbolFromFile获取一张位图
PieChartSymbol	Defines a pie chart symbol.
SimpleMarker3DSymbol (3DAnalyst)	Simple 3D Marker Symbol component.
SimpleMarkerSymbol	简单类型点符号，有五种类型（esriSMSCircle、esriSMSSquare、esriSMSCross、esriSMSX和esriSMSDiamond）
StackedChartSymbol	Defines a stacked chart symbol.
TextMarkerSymbol (TrackingAnalyst)	Class used to create a text marker symbol used to symbolize point geometries.

　　都实现IMarkerSymbol接口，定义了Angle、Color、Size、Xoffset、Yoffset。

private void simpleMarkerSymbolToolStripMenuItem_Click(object sender, EventArgs e)
        {
            ISimpleMarkerSymbol iMarkerSymbol;
            ISymbol iSymbol;
            IRgbColor iRgbColor;
            iMarkerSymbol = new SimpleMarkerSymbol();
            iMarkerSymbol.Style = esriSimpleMarkerStyle.esriSMSCircle;
            iRgbColor = new RgbColor();
            iRgbColor = getRGB(100, 100, 100);
            iMarkerSymbol.Color = iRgbColor;
            iSymbol = (ISymbol)iMarkerSymbol;
            iSymbol.ROP2 = esriRasterOpCode.esriROPNotXOrPen;//Raster operation code for pixel drawing
            IPoint point1 = new PointClass();
            IPoint point2 = new PointClass();
            point1.PutCoords(5, 5);
            point2.PutCoords(5, 10);
            this.axMapControl1.FlashShape(point1 as IGeometry, 3, 200, iSymbol);//闪烁
            this.axMapControl1.FlashShape(point2);
        }

        private void arrowMarkerSymbolToolStripMenuItem_Click(object sender, EventArgs e)
        {
            IArrowMarkerSymbol arrowMarkerSymbol = new ArrowMarkerSymbolClass();
            IRgbColor iRgbColor;
            iRgbColor = new RgbColor();
            iRgbColor = getRGB(100, 100, 100);
            arrowMarkerSymbol.Angle = 90;
            arrowMarkerSymbol.Color = iRgbColor;
            arrowMarkerSymbol.Length = 30;
            arrowMarkerSymbol.Width = 20;
            arrowMarkerSymbol.XOffset = 0;
            arrowMarkerSymbol.YOffset = 0;
            arrowMarkerSymbol.Style = esriArrowMarkerStyle.esriAMSPlain;
            IPoint point1 = new PointClass();
            IPoint point2 = new PointClass();
            point1.PutCoords(5, 5);
            point2.PutCoords(5, 10);
            this.axMapControl1.FlashShape(point1 as IGeometry, 3, 500, arrowMarkerSymbol);
            this.axMapControl1.FlashShape(point2 as IGeometry);
        }
        //定义字体符号
        private void chartMarkerSymbolToolStripMenuItem_Click(object sender, EventArgs e)
        {
            ICharacterMarkerSymbol characterMarkerSymbol = new CharacterMarkerSymbol();
            stdole.IFontDisp fontDisp = (stdole.IFontDisp)(new stdole.StdFontClass());
            IRgbColor rgbColor = new RgbColor();
            rgbColor = getRGB(100, 100, 100);
            fontDisp.Name = "arial";
            fontDisp.Size = 12;
            fontDisp.Italic = true;//斜体

            characterMarkerSymbol.Angle = 0;
            characterMarkerSymbol.CharacterIndex = 97;
            characterMarkerSymbol.Color = rgbColor;
            characterMarkerSymbol.Font = fontDisp;
            characterMarkerSymbol.Size = 24;
            characterMarkerSymbol.XOffset = 0;
            characterMarkerSymbol.YOffset = 0;

            IPoint point1 = new PointClass();
            IPoint point2 = new PointClass();
            point1.PutCoords(5, 5);
            point2.PutCoords(5, 10);
            this.axMapControl1.FlashShape(point1 as IGeometry, 3, 500, characterMarkerSymbol);
            this.axMapControl1.FlashShape(point2 as IGeometry);
        }

        private void pictureMarkerSmpolToolStripMenuItem_Click(object sender, EventArgs e)
        {
            IRgbColor rgbColor = new RgbColorClass();
            IPictureMarkerSymbol pictureMarkerSymbol = new PictureMarkerSymbolClass();
            //string fileName = @"E:\vs2005\第五章\lesson2\lesson2\data\qq.bmp";

            string path = Directory.GetCurrentDirectory();
            string fileName = path + @"Images\00_43.gif";
            pictureMarkerSymbol.CreateMarkerSymbolFromFile(esriIPictureType.esriIPictureBitmap, fileName);
            pictureMarkerSymbol.Angle = 0;
            pictureMarkerSymbol.BitmapTransparencyColor = rgbColor;
            pictureMarkerSymbol.Size = 20;
            pictureMarkerSymbol.XOffset = 0;
            pictureMarkerSymbol.YOffset = 0;
            IPoint point1 = new PointClass();
            IPoint point2 = new PointClass();
            point1.PutCoords(5, 5);
            point2.PutCoords(5, 10);

            this.axMapControl1.FlashShape(point1 as IGeometry, 3, 200, pictureMarkerSymbol);
            this.axMapControl1.FlashShape(point2 as IGeometry);
        }

        private void multiLayerMarkerSmbolToolStripMenuItem_Click(object sender, EventArgs e)
        {
            IMultiLayerMarkerSymbol multiLayerMarkerSymbol = new MultiLayerMarkerSymbolClass();

            IPictureMarkerSymbol pictureMarkerSymbol = new PictureMarkerSymbolClass();
            ICharacterMarkerSymbol characterMarkerSymbol = new CharacterMarkerSymbol();

            stdole.IFontDisp fontDisp = (stdole.IFontDisp)(new stdole.StdFontClass());
            IRgbColor rgbColor = new RgbColor();
            rgbColor = getRGB(0, 0, 0);
            fontDisp.Name = "arial";
            fontDisp.Size = 12;
            fontDisp.Italic = true;
            //创建字符符号
            characterMarkerSymbol.Angle = 0;
            characterMarkerSymbol.CharacterIndex = 97;
            characterMarkerSymbol.Color = rgbColor;
            characterMarkerSymbol.Font = fontDisp;
            characterMarkerSymbol.Size = 24;
            characterMarkerSymbol.XOffset = 0;
            characterMarkerSymbol.YOffset = 0;
            //创建图片符号
            //string fileName = @"E:\vs2005\第五章\lesson2\lesson2\data\qq.bmp";
            string path = Directory.GetCurrentDirectory();
            string fileName = path + @"Images\00_43.gif";
            pictureMarkerSymbol.CreateMarkerSymbolFromFile(esriIPictureType.esriIPictureBitmap, fileName);
            pictureMarkerSymbol.Angle = 0;
            pictureMarkerSymbol.BitmapTransparencyColor = rgbColor;
            pictureMarkerSymbol.Size = 30;
            pictureMarkerSymbol.XOffset = 0;
            pictureMarkerSymbol.YOffset = 0;
            //添加图片、字符符号到组合符号中
            multiLayerMarkerSymbol.AddLayer(pictureMarkerSymbol);
            multiLayerMarkerSymbol.AddLayer(characterMarkerSymbol);
            multiLayerMarkerSymbol.Angle = 0;
            multiLayerMarkerSymbol.Size = 30;
            multiLayerMarkerSymbol.XOffset = 0;
            multiLayerMarkerSymbol.YOffset = 0;

            IPoint point1 = new PointClass();
            IPoint point2 = new PointClass();
            point1.PutCoords(5, 5);
            point2.PutCoords(5, 10);
            this.axMapControl1.FlashShape(point1 as IGeometry, 3, 200, multiLayerMarkerSymbol);
            this.axMapControl1.FlashShape(point2 as IGeometry);
        }

二、LineSymbol对象

　　用于修饰线性几何对象符号。Color和Width属性为两个唯一公共属性。

　　子类有：

Classes	Description
CartographicLineSymbol	制图线符号，实现ICatographicLineSymbol（主要设置线符号的节点属性，Join：设置线要素转折处的样式）和ILineProperties接口
HashLineSymbol	离散线符号
MarkerLineSymbol	A line symbol composed of repeating markers.点线符号
MultiLayerLineSymbol	A line symbol that contains one or more layers.使用重叠符号方法产生新符号
PictureLineSymbol	A line symbol composed of either a BMP or an EMF picture.比如火车线路符号
SimpleLine3DSymbol (3DAnalyst)	Simple 3D Line Symbol component.
SimpleLineSymbol	简单线符号
TextureLineSymbol (3DAnalyst)	Texture Line Symbol component.（纹理贴图线符号）

private void simpleLineSymbolToolStripMenuItem_Click(object sender, EventArgs e)
        {
            ISimpleLineSymbol simpleLineSymbol = new SimpleLineSymbolClass();
            simpleLineSymbol.Style = esriSimpleLineStyle.esriSLSDashDotDot;
            IPolyline polyline = new PolylineClass();
            IPoint point = new PointClass();
            point.PutCoords(1, 1);
            polyline.FromPoint = point;
            point.PutCoords(10, 10);
            polyline.ToPoint = point;
            simpleLineSymbol.Width = 10;
            IRgbColor rgbColor = getRGB(255, 0, 0);
            simpleLineSymbol.Color = rgbColor;
            ISymbol symbol = simpleLineSymbol as ISymbol;
            symbol.ROP2 = esriRasterOpCode.esriROPNotXOrPen;
            IActiveView activeView = this.axMapControl1.ActiveView;
            //用activeView.ScreenDisplay进行画图
            activeView.ScreenDisplay.StartDrawing(activeView.ScreenDisplay.hDC, (short)esriScreenCache.esriNoScreenCache);
            activeView.ScreenDisplay.SetSymbol(symbol);
            activeView.ScreenDisplay.DrawPolyline(polyline as IGeometry);
            activeView.ScreenDisplay.FinishDrawing();
            activeView.ScreenDisplay.FinishDrawing();//释放资源
        }

        private void cartographicLineSymbolToolStripMenuItem_Click(object sender, EventArgs e)
        {
            ICartographicLineSymbol cartographicLineSymbol = new CartographicLineSymbolClass();//制图线符号
            cartographicLineSymbol.Cap = esriLineCapStyle.esriLCSButt;
            cartographicLineSymbol.Join = esriLineJoinStyle.esriLJSBevel;//连接方式
            cartographicLineSymbol.Width = 10;
            cartographicLineSymbol.MiterLimit = 4;//Size threshold(阈值) for showing mitered line joins.
            ILineProperties lineProperties;
            lineProperties = cartographicLineSymbol as ILineProperties;
            lineProperties.Offset = 0;
            double[] dob = new double[6];
            dob[0] = 0;
            dob[1] = 1;
            dob[2] = 2;
            dob[3] = 3;
            dob[4] = 4;
            dob[5] = 5;
            ITemplate template = new TemplateClass();//定义模版
            template.Interval = 1;
            for (int i = 0; i < dob.Length; i += 2)
            {
                template.AddPatternElement(dob[i], dob[i + 1]);
            }
            lineProperties.Template = template;

            IPolyline polyline = new PolylineClass();
            IPoint point = new PointClass();
            point.PutCoords(1, 1);
            polyline.FromPoint = point;
            point.PutCoords(10, 10);
            polyline.ToPoint = point;
            IRgbColor rgbColor = getRGB(0, 255, 0);
            cartographicLineSymbol.Color = rgbColor;
            IActiveView activeView = this.axMapControl1.ActiveView;
            activeView.ScreenDisplay.StartDrawing(activeView.ScreenDisplay.hDC, (short)esriScreenCache.esriNoScreenCache);
            activeView.ScreenDisplay.SetSymbol(cartographicLineSymbol as ISymbol);
            activeView.ScreenDisplay.DrawPolyline(polyline as IGeometry);
            activeView.ScreenDisplay.FinishDrawing();
            activeView.ScreenDisplay.FinishDrawing();
        }

        private void multiLayerLineSymbolToolStripMenuItem_Click(object sender, EventArgs e)
        {
            IMultiLayerLineSymbol multiLayerLineSymbol = new MultiLayerLineSymbolClass();
            ISimpleLineSymbol simpleLineSymbol = new SimpleLineSymbolClass();
            simpleLineSymbol.Style = esriSimpleLineStyle.esriSLSDashDotDot;
            simpleLineSymbol.Width = 10;
            IRgbColor rgbColor = getRGB(255, 0, 0);
            simpleLineSymbol.Color = rgbColor;
            ISymbol symbol = simpleLineSymbol as ISymbol;
            symbol.ROP2 = esriRasterOpCode.esriROPNotXOrPen;

            ICartographicLineSymbol cartographicLineSymbol = new CartographicLineSymbolClass();
            cartographicLineSymbol.Cap = esriLineCapStyle.esriLCSButt;
            cartographicLineSymbol.Join = esriLineJoinStyle.esriLJSBevel;
            cartographicLineSymbol.Width = 10;
            cartographicLineSymbol.MiterLimit = 4;
            ILineProperties lineProperties;
            lineProperties = cartographicLineSymbol as ILineProperties;
            lineProperties.Offset = 0;
            double[] dob = new double[6];
            dob[0] = 0;
            dob[1] = 1;
            dob[2] = 2;
            dob[3] = 3;
            dob[4] = 4;
            dob[5] = 5;
            ITemplate template = new TemplateClass();
            template.Interval = 1;
            for (int i = 0; i < dob.Length; i += 2)
            {
                template.AddPatternElement(dob[i], dob[i + 1]);
            }
            lineProperties.Template = template;

            IPolyline polyline = new PolylineClass();
            IPoint point = new PointClass();
            point.PutCoords(1, 1);
            polyline.FromPoint = point;
            point.PutCoords(10, 10);
            polyline.ToPoint = point;
            rgbColor = getRGB(0, 255, 0);
            cartographicLineSymbol.Color = rgbColor;
            multiLayerLineSymbol.AddLayer(simpleLineSymbol);
            multiLayerLineSymbol.AddLayer(cartographicLineSymbol);

            IActiveView activeView = this.axMapControl1.ActiveView;

            activeView.ScreenDisplay.StartDrawing(activeView.ScreenDisplay.hDC, (short)esriScreenCache.esriNoScreenCache);
            activeView.ScreenDisplay.SetSymbol(multiLayerLineSymbol as ISymbol);
            activeView.ScreenDisplay.DrawPolyline(polyline as IGeometry);
            activeView.ScreenDisplay.FinishDrawing();
            activeView.ScreenDisplay.FinishDrawing();
        }

        private void hashLineSymbolToolStripMenuItem_Click(object sender, EventArgs e)
        {
            IHashLineSymbol hashLineSymbol = new HashLineSymbolClass();
            ILineProperties lineProperties = hashLineSymbol as ILineProperties;
            lineProperties.Offset = 0;
            double[] dob = new double[6];
            dob[0] = 0;
            dob[1] = 1;
            dob[2] = 2;
            dob[3] = 3;
            dob[4] = 4;
            dob[5] = 5;
            ITemplate template = new TemplateClass();
            template.Interval = 1;
            for (int i = 0; i < dob.Length; i += 2)
            {
                template.AddPatternElement(dob[i], dob[i + 1]);
            }
            lineProperties.Template = template;

            hashLineSymbol.Width = 2;
            hashLineSymbol.Angle = 45;
            IRgbColor hashColor = new RgbColor();
            hashColor = getRGB(0, 0, 255);
            hashLineSymbol.Color = hashColor;

            IPolyline polyline = new PolylineClass();
            IPoint point = new PointClass();
            point.PutCoords(1, 1);
            polyline.FromPoint = point;
            point.PutCoords(10, 10);
            polyline.ToPoint = point;
            IActiveView activeView = this.axMapControl1.ActiveView;

            activeView.ScreenDisplay.StartDrawing(activeView.ScreenDisplay.hDC, (short)esriScreenCache.esriNoScreenCache);
            activeView.ScreenDisplay.SetSymbol(hashLineSymbol as ISymbol);
            activeView.ScreenDisplay.DrawPolyline(polyline as IGeometry);
            activeView.ScreenDisplay.FinishDrawing();
            activeView.ScreenDisplay.FinishDrawing();
        }

        //下面的没有看
        private void markerLineSymbolToolStripMenuItem_Click(object sender, EventArgs e)
        {
            IArrowMarkerSymbol arrowMarkerSymbol = new ArrowMarkerSymbolClass();
            IRgbColor rgbColor = getRGB(255, 0, 0);
            arrowMarkerSymbol.Color = rgbColor as IColor;
            arrowMarkerSymbol.Length = 10;
            arrowMarkerSymbol.Width = 10;
            arrowMarkerSymbol.Style = esriArrowMarkerStyle.esriAMSPlain;

            IMarkerLineSymbol markerLineSymbol = new MarkerLineSymbolClass();
            markerLineSymbol.MarkerSymbol = arrowMarkerSymbol;
            rgbColor = getRGB(0, 255, 0);
            markerLineSymbol.Color = rgbColor;
            IPolyline polyline = new PolylineClass();
            IPoint point = new PointClass();
            point.PutCoords(1, 1);
            polyline.FromPoint = point;
            point.PutCoords(10, 10);
            polyline.ToPoint = point;
            IActiveView activeView = this.axMapControl1.ActiveView;
            activeView.ScreenDisplay.StartDrawing(activeView.ScreenDisplay.hDC, (short)esriScreenCache.esriNoScreenCache);
            activeView.ScreenDisplay.SetSymbol(markerLineSymbol as ISymbol);
            activeView.ScreenDisplay.DrawPolyline(polyline as IGeometry);
            activeView.ScreenDisplay.FinishDrawing();
            activeView.ScreenDisplay.FinishDrawing();
        }

        private void pictureLineSymbolToolStripMenuItem_Click(object sender, EventArgs e)
        {
            IPictureLineSymbol pictureLineSymbol = new PictureLineSymbolClass();
            //创建图片符号
            //string fileName = @"E:\vs2005\第五章\lesson2\lesson2\data\qq.bmp";
            string path = Directory.GetCurrentDirectory();
            string fileName = path + @"\qq.bmp";
            pictureLineSymbol.CreateLineSymbolFromFile(esriIPictureType.esriIPictureBitmap, fileName);
            IRgbColor rgbColor = getRGB(0, 255, 0);
            pictureLineSymbol.Color = rgbColor;
            pictureLineSymbol.Offset = 0;
            pictureLineSymbol.Width = 10;
            pictureLineSymbol.Rotate = false;

            IPolyline polyline = new PolylineClass();
            IPoint point = new PointClass();
            point.PutCoords(1, 1);
            polyline.FromPoint = point;
            point.PutCoords(10, 10);
            polyline.ToPoint = point;
            IActiveView activeView = this.axMapControl1.ActiveView;
            activeView.ScreenDisplay.StartDrawing(activeView.ScreenDisplay.hDC, (short)esriScreenCache.esriNoScreenCache);
            activeView.ScreenDisplay.SetSymbol(pictureLineSymbol as ISymbol);
            activeView.ScreenDisplay.DrawPolyline(polyline as IGeometry);
            activeView.ScreenDisplay.FinishDrawing();
            activeView.ScreenDisplay.FinishDrawing();
        }

三、FillSymbol对象

　　用来修饰多边形等具有面积的几何形体的符号对象。只定义Color和OutLine两个属性。

Classes	Description
ColorRampSymbol (Carto)	ESRI ColorRampSymbol for raster rendering.
ColorSymbol (Carto)	ESRI ColorSymbol for raster rendering.
DotDensityFillSymbol	Defines a dot density fill symbol, a data driven symbol commonly used with the DotDensityRenderer对象.
GradientFillSymbol	渐变颜色填充符号，IntervalCount属性来设置用户所需要的颜色梯度。
LineFillSymbol	线填充符号，表现为重复的线条，可以设置线的角度，偏移量和线之间的间隔距离。
MarkerFillSymbol	点填充符号，使用一个Marker符号作为背景填充符号，实现了IMarkerFillSymbol和IFillProperties两个接口
MultiLayerFillSymbol	多层填充符号，使用多个填充符号进行叠加
PictureFillSymbol	A fill symbol based on either a BMP or an EMF picture.
RasterRGBSymbol (Carto)	ESRI RasterRGBSymbol for raster rendering.
SimpleFillSymbol	A fill symbol comprised from a predefined set of styles.
TextureFillSymbol (3DAnalyst)	Texture Fill Symbol component.

private void simpleFillSymbolToolStripMenuItem_Click(object sender, EventArgs e)
        {
            //简单填充符号
            ISimpleFillSymbol simpleFillSymbol = new SimpleFillSymbolClass();
            simpleFillSymbol.Style = esriSimpleFillStyle.esriSFSSolid;
            simpleFillSymbol.Color = getRGB(255, 0, 0);
            //创建边线符号
            ISimpleLineSymbol simpleLineSymbol = new SimpleLineSymbolClass();
            simpleLineSymbol.Style = esriSimpleLineStyle.esriSLSDashDotDot;
            simpleLineSymbol.Color = getRGB(0, 255, 0);
            simpleLineSymbol.Width = 10;
            ISymbol symbol = simpleLineSymbol as ISymbol;
            symbol.ROP2 = esriRasterOpCode.esriROPNotXOrPen;

            simpleFillSymbol.Outline = simpleLineSymbol;
            //创建面对象
            object Missing = Type.Missing;
            IPolygon polygon = new PolygonClass();
            IPointCollection pointCollection = polygon as IPointCollection;
            IPoint point = new PointClass();
            point.PutCoords(5, 5);
            pointCollection.AddPoint(point, ref Missing, ref Missing);
            point.PutCoords(5, 10);
            pointCollection.AddPoint(point, ref Missing, ref Missing);
            point.PutCoords(10, 10);
            pointCollection.AddPoint(point, ref Missing, ref Missing);
            point.PutCoords(10, 5);
            pointCollection.AddPoint(point, ref Missing, ref Missing);
            polygon.SimplifyPreserveFromTo();
            IActiveView activeView = this.axMapControl1.ActiveView;
            activeView.ScreenDisplay.StartDrawing(activeView.ScreenDisplay.hDC, (short)esriScreenCache.esriNoScreenCache);
            activeView.ScreenDisplay.SetSymbol(simpleFillSymbol as ISymbol);
            activeView.ScreenDisplay.DrawPolygon(polygon as IGeometry);
            activeView.ScreenDisplay.FinishDrawing();
        }

        private void lineFillSymbolToolStripMenuItem_Click(object sender, EventArgs e)
        {
            ICartographicLineSymbol cartoLine = new CartographicLineSymbol();
            cartoLine.Cap = esriLineCapStyle.esriLCSButt;
            cartoLine.Join = esriLineJoinStyle.esriLJSMitre;
            cartoLine.Color = getRGB(255, 0, 0);
            cartoLine.Width = 2;
            //Create the LineFillSymbo
            ILineFillSymbol lineFill = new LineFillSymbol();
            lineFill.Angle = 45;
            lineFill.Separation = 10;
            lineFill.Offset = 5;
            lineFill.LineSymbol = cartoLine;
            object Missing = Type.Missing;
            IPolygon polygon = new PolygonClass();
            IPointCollection pointCollection = polygon as IPointCollection;
            IPoint point = new PointClass();
            point.PutCoords(5, 5);
            pointCollection.AddPoint(point, ref Missing, ref Missing);
            point.PutCoords(5, 10);
            pointCollection.AddPoint(point, ref Missing, ref Missing);
            point.PutCoords(10, 10);
            pointCollection.AddPoint(point, ref Missing, ref Missing);
            point.PutCoords(10, 5);
            pointCollection.AddPoint(point, ref Missing, ref Missing);
            polygon.SimplifyPreserveFromTo();
            IActiveView activeView = this.axMapControl1.ActiveView;
            activeView.ScreenDisplay.StartDrawing(activeView.ScreenDisplay.hDC, (short)esriScreenCache.esriNoScreenCache);
            activeView.ScreenDisplay.SetSymbol(lineFill as ISymbol);
            activeView.ScreenDisplay.DrawPolygon(polygon as IGeometry);
            activeView.ScreenDisplay.FinishDrawing();
        }

        private void markerFillSymbolToolStripMenuItem_Click(object sender, EventArgs e)
        {
            IArrowMarkerSymbol arrowMarkerSymbol = new ArrowMarkerSymbolClass();
            IRgbColor rgbColor = getRGB(255, 0, 0);
            arrowMarkerSymbol.Color = rgbColor as IColor;
            arrowMarkerSymbol.Length = 10;
            arrowMarkerSymbol.Width = 10;
            arrowMarkerSymbol.Style = esriArrowMarkerStyle.esriAMSPlain;


            IMarkerFillSymbol markerFillSymbol = new MarkerFillSymbolClass();
            markerFillSymbol.MarkerSymbol = arrowMarkerSymbol;
            rgbColor = getRGB(0, 255, 0);
            markerFillSymbol.Color = rgbColor;
            markerFillSymbol.Style = esriMarkerFillStyle.esriMFSGrid;

            IFillProperties fillProperties = markerFillSymbol as IFillProperties;
            fillProperties.XOffset = 2;
            fillProperties.YOffset = 2;
            fillProperties.XSeparation = 15;
            fillProperties.YSeparation = 20;

            object Missing = Type.Missing;
            IPolygon polygon = new PolygonClass();
            IPointCollection pointCollection = polygon as IPointCollection;
            IPoint point = new PointClass();
            point.PutCoords(5, 5);
            pointCollection.AddPoint(point, ref Missing, ref Missing);
            point.PutCoords(5, 10);
            pointCollection.AddPoint(point, ref Missing, ref Missing);
            point.PutCoords(10, 10);
            pointCollection.AddPoint(point, ref Missing, ref Missing);
            point.PutCoords(10, 5);
            pointCollection.AddPoint(point, ref Missing, ref Missing);
            polygon.SimplifyPreserveFromTo();
            IActiveView activeView = this.axMapControl1.ActiveView;
            activeView.ScreenDisplay.StartDrawing(activeView.ScreenDisplay.hDC, (short)esriScreenCache.esriNoScreenCache);
            activeView.ScreenDisplay.SetSymbol(markerFillSymbol as ISymbol);
            activeView.ScreenDisplay.DrawPolygon(polygon as IGeometry);
            activeView.ScreenDisplay.FinishDrawing();
        }

        private void gradientFillSymbolToolStripMenuItem_Click(object sender, EventArgs e)
        {
            IGradientFillSymbol gradientFillSymbol = new GradientFillSymbolClass();
            IAlgorithmicColorRamp algorithcColorRamp = new AlgorithmicColorRampClass();
            algorithcColorRamp.FromColor = getRGB(255, 0, 0);
            algorithcColorRamp.ToColor = getRGB(0, 255, 0);
            algorithcColorRamp.Algorithm = esriColorRampAlgorithm.esriHSVAlgorithm;
            gradientFillSymbol.ColorRamp = algorithcColorRamp;
            gradientFillSymbol.GradientAngle = 45;
            gradientFillSymbol.GradientPercentage = 0.9;
            gradientFillSymbol.Style = esriGradientFillStyle.esriGFSLinear;


            object Missing = Type.Missing;
            IPolygon polygon = new PolygonClass();
            IPointCollection pointCollection = polygon as IPointCollection;
            IPoint point = new PointClass();
            point.PutCoords(5, 5);
            pointCollection.AddPoint(point, ref Missing, ref Missing);
            point.PutCoords(5, 10);
            pointCollection.AddPoint(point, ref Missing, ref Missing);
            point.PutCoords(10, 10);
            pointCollection.AddPoint(point, ref Missing, ref Missing);
            point.PutCoords(10, 5);
            pointCollection.AddPoint(point, ref Missing, ref Missing);
            polygon.SimplifyPreserveFromTo();
            IActiveView activeView = this.axMapControl1.ActiveView;
            activeView.ScreenDisplay.StartDrawing(activeView.ScreenDisplay.hDC, (short)esriScreenCache.esriNoScreenCache);
            activeView.ScreenDisplay.SetSymbol(gradientFillSymbol as ISymbol);
            activeView.ScreenDisplay.DrawPolygon(polygon as IGeometry);
            activeView.ScreenDisplay.FinishDrawing();
        }

        private void pictureFillSymbolToolStripMenuItem_Click(object sender, EventArgs e)
        {
            IPictureFillSymbol pictureFillSymbol = new PictureFillSymbolClass();
            //创建图片符号
            //string fileName = @"E:\vs2005\第五章\lesson2\lesson2\data\qq.bmp";
            string path = Directory.GetCurrentDirectory();
            string fileName = path + @"\qq.bmp";
            pictureFillSymbol.CreateFillSymbolFromFile(esriIPictureType.esriIPictureBitmap, fileName);
            pictureFillSymbol.Color = getRGB(0, 255, 0);

            ISimpleLineSymbol simpleLineSymbol = new SimpleLineSymbolClass();
            simpleLineSymbol.Style = esriSimpleLineStyle.esriSLSDashDotDot;
            simpleLineSymbol.Color = getRGB(255, 0, 0);
            ISymbol symbol = pictureFillSymbol as ISymbol;
            symbol.ROP2 = esriRasterOpCode.esriROPNotXOrPen;

            pictureFillSymbol.Outline = simpleLineSymbol;
            pictureFillSymbol.Angle = 45;

            object Missing = Type.Missing;
            IPolygon polygon = new PolygonClass();
            IPointCollection pointCollection = polygon as IPointCollection;
            IPoint point = new PointClass();
            point.PutCoords(5, 5);
            pointCollection.AddPoint(point, ref Missing, ref Missing);
            point.PutCoords(5, 10);
            pointCollection.AddPoint(point, ref Missing, ref Missing);
            point.PutCoords(10, 10);
            pointCollection.AddPoint(point, ref Missing, ref Missing);
            point.PutCoords(10, 5);
            pointCollection.AddPoint(point, ref Missing, ref Missing);
            polygon.SimplifyPreserveFromTo();
            IActiveView activeView = this.axMapControl1.ActiveView;
            activeView.ScreenDisplay.StartDrawing(activeView.ScreenDisplay.hDC, (short)esriScreenCache.esriNoScreenCache);
            activeView.ScreenDisplay.SetSymbol(pictureFillSymbol as ISymbol);
            activeView.ScreenDisplay.DrawPolygon(polygon as IGeometry);
            activeView.ScreenDisplay.FinishDrawing();
        }

        private void multilayerFillSymbolToolStripMenuItem_Click(object sender, EventArgs e)
        {
            IMultiLayerFillSymbol multiLayerFillSymbol = new MultiLayerFillSymbolClass();

            IGradientFillSymbol gradientFillSymbol = new GradientFillSymbolClass();
            IAlgorithmicColorRamp algorithcColorRamp = new AlgorithmicColorRampClass();
            algorithcColorRamp.FromColor = getRGB(255, 0, 0);
            algorithcColorRamp.ToColor = getRGB(0, 255, 0);
            algorithcColorRamp.Algorithm = esriColorRampAlgorithm.esriHSVAlgorithm;
            gradientFillSymbol.ColorRamp = algorithcColorRamp;
            gradientFillSymbol.GradientAngle = 45;
            gradientFillSymbol.GradientPercentage = 0.9;
            gradientFillSymbol.Style = esriGradientFillStyle.esriGFSLinear;

            ICartographicLineSymbol cartoLine = new CartographicLineSymbol();
            cartoLine.Cap = esriLineCapStyle.esriLCSButt;
            cartoLine.Join = esriLineJoinStyle.esriLJSMitre;
            cartoLine.Color = getRGB(255, 0, 0);
            cartoLine.Width = 2;
            //Create the LineFillSymbo
            ILineFillSymbol lineFill = new LineFillSymbol();
            lineFill.Angle = 45;
            lineFill.Separation = 10;
            lineFill.Offset = 5;
            lineFill.LineSymbol = cartoLine;


            multiLayerFillSymbol.AddLayer(gradientFillSymbol);
            multiLayerFillSymbol.AddLayer(lineFill);

            object Missing = Type.Missing;
            IPolygon polygon = new PolygonClass();
            IPointCollection pointCollection = polygon as IPointCollection;
            IPoint point = new PointClass();
            point.PutCoords(5, 5);
            pointCollection.AddPoint(point, ref Missing, ref Missing);
            point.PutCoords(5, 10);
            pointCollection.AddPoint(point, ref Missing, ref Missing);
            point.PutCoords(10, 10);
            pointCollection.AddPoint(point, ref Missing, ref Missing);
            point.PutCoords(10, 5);
            pointCollection.AddPoint(point, ref Missing, ref Missing);
            polygon.SimplifyPreserveFromTo();
            IActiveView activeView = this.axMapControl1.ActiveView;
            activeView.ScreenDisplay.StartDrawing(activeView.ScreenDisplay.hDC, (short)esriScreenCache.esriNoScreenCache);
            activeView.ScreenDisplay.SetSymbol(multiLayerFillSymbol as ISymbol);
            activeView.ScreenDisplay.DrawPolygon(polygon as IGeometry);
            activeView.ScreenDisplay.FinishDrawing();
        }

四、TextSymbol对象

　　用于修饰文字元素，实现ITextSymbol，ISimpleTextSymbol，IFormattedTextSymbol接口。

　　ITextSymbol是定义文本字符对象的主要接口，通过IFontDisp接口来设置字体的大小、粗体、斜体等。

　　ISimpleTextSymbol

 

 　　BezierTextPath对象可以让文字的路径按照贝塞尔曲线设置。

　　ITextPath接口提供用来计算每个字符文字路径的位置。

　　IFormattedTextSymbol接口用来设置背景对象、阴影等属性

private void textSybmolToolStripMenuItem_Click(object sender, EventArgs e)
        {
            ITextSymbol textSymbol = new TextSymbolClass();
            System.Drawing.Font drawFont = new System.Drawing.Font("宋体", 16, FontStyle.Bold);
            stdole.IFontDisp fontDisp = (stdole.IFontDisp)(new stdole.StdFontClass());
            textSymbol.Font = fontDisp;
            textSymbol.Color = getRGB(0, 255, 0);
            textSymbol.Size = 20;
            IPolyline polyline = new PolylineClass();
            IPoint point = new PointClass();
            point.PutCoords(1, 1);
            polyline.FromPoint = point;
            point.PutCoords(10, 10);
            polyline.ToPoint = point;
            ITextPath textPath = new BezierTextPathClass();
            //创建简单标注
            ILineSymbol lineSymbol = new SimpleLineSymbolClass();
            lineSymbol.Color = getRGB(255, 0, 0);
            lineSymbol.Width = 5;
            ISimpleTextSymbol simpleTextSymbol = textSymbol as ISimpleTextSymbol;
            simpleTextSymbol.TextPath = textPath;
            object oLineSymbol = lineSymbol;
            object oTextSymbol = textSymbol;
            IActiveView activeView = this.axMapControl1.ActiveView;
            activeView.ScreenDisplay.StartDrawing(activeView.ScreenDisplay.hDC, (short)esriScreenCache.esriNoScreenCache);
            activeView.ScreenDisplay.SetSymbol(oLineSymbol as ISymbol);
            activeView.ScreenDisplay.DrawPolyline(polyline as IGeometry);
            activeView.ScreenDisplay.SetSymbol(oTextSymbol as ISymbol);
            activeView.ScreenDisplay.DrawText(polyline as IGeometry, "简单标注"); ;
            activeView.ScreenDisplay.FinishDrawing();

            //创建气泡标注（两中风格，一种是有锚点，一种是marker方式）
            //锚点方式
            ISimpleFillSymbol simpleFillSymbol = new SimpleFillSymbolClass();
            simpleFillSymbol.Color = getRGB(0, 255, 0);
            simpleFillSymbol.Style = esriSimpleFillStyle.esriSFSSolid;
            IBalloonCallout balloonCallout = new BalloonCalloutClass();
            balloonCallout.Style = esriBalloonCalloutStyle.esriBCSRectangle;
            balloonCallout.Symbol = simpleFillSymbol;
            balloonCallout.LeaderTolerance = 10;

            point.PutCoords(5, 5);
            balloonCallout.AnchorPoint = point;

            IGraphicsContainer graphicsContainer = activeView as IGraphicsContainer;
            IFormattedTextSymbol formattedTextSymbol = new TextSymbolClass();
            formattedTextSymbol.Color = getRGB(0, 0, 255);
            point.PutCoords(10, 5);
            ITextBackground textBackground = balloonCallout as ITextBackground;
            formattedTextSymbol.Background = textBackground;
            activeView.ScreenDisplay.StartDrawing(activeView.ScreenDisplay.hDC, (short)esriScreenCache.esriNoScreenCache);
            activeView.ScreenDisplay.SetSymbol(formattedTextSymbol as ISymbol);
            activeView.ScreenDisplay.DrawText(point as IGeometry, "气泡1");
            activeView.ScreenDisplay.FinishDrawing();

            //marker方式
            textSymbol = new TextSymbolClass();
            textSymbol.Color = getRGB(255, 0, 0);
            textSymbol.Angle = 0;
            textSymbol.RightToLeft = false;
            textSymbol.VerticalAlignment = esriTextVerticalAlignment.esriTVABaseline;
            textSymbol.HorizontalAlignment = esriTextHorizontalAlignment.esriTHAFull;

            IMarkerTextBackground markerTextBackground = new MarkerTextBackgroundClass();
            markerTextBackground.ScaleToFit = true;
            markerTextBackground.TextSymbol = textSymbol;

            IRgbColor rgbColor = new RgbColorClass();
            IPictureMarkerSymbol pictureMarkerSymbol = new PictureMarkerSymbolClass();
            //string fileName = @"E:\vs2005\第五章\lesson2\lesson2\data\qq.bmp";
            string path = Directory.GetCurrentDirectory();
            string fileName = path + @"\qq.bmp";
            pictureMarkerSymbol.CreateMarkerSymbolFromFile(esriIPictureType.esriIPictureBitmap, fileName);
            pictureMarkerSymbol.Angle = 0;
            pictureMarkerSymbol.BitmapTransparencyColor = rgbColor;
            pictureMarkerSymbol.Size = 20;
            pictureMarkerSymbol.XOffset = 0;
            pictureMarkerSymbol.YOffset = 0;

            markerTextBackground.Symbol = pictureMarkerSymbol as IMarkerSymbol;

            formattedTextSymbol = new TextSymbolClass();
            formattedTextSymbol.Color = getRGB(255, 0, 0);
            fontDisp.Size = 10;
            fontDisp.Bold = true;
            formattedTextSymbol.Font = fontDisp;

            point.PutCoords(15, 5);

            formattedTextSymbol.Background = markerTextBackground;
            activeView.ScreenDisplay.StartDrawing(activeView.ScreenDisplay.hDC, (short)esriScreenCache.esriNoScreenCache);
            activeView.ScreenDisplay.SetSymbol(formattedTextSymbol as ISymbol);
            activeView.ScreenDisplay.DrawText(point as IGeometry, "气泡2");
            activeView.ScreenDisplay.FinishDrawing();

        }

 五、3DChartSymbol对象

　　是一个抽象类，有三个子类：BarChart（用来着色）、PieChart、StaekedChart。

　　它实现多个接口：IChartSymbol、IBarChartSymbol、IPieChartSymbol和IStackedSymbol等。

　　IChartSymbol接口主要用于计算一个ChartSymbol对象中的柱状和饼状部分的尺寸，其中Maximum值是创建3DChartSymbol对象后必须设置的一个属性，着色一般在一个要素图层上进行，因而可以从它的要素类中获得一系列的数值统计值。如果有三个数值参与着色，系统则必须对三个数值进行大小比较，找出最大的那个赋值给Maximum。Value属性用数组来设置柱状高度或饼状宽度。可以用ISymbolArray来管理多个参与着色的符号对象。

　　BarChartSymbol对象实现IBarChartSymbol接口，用不同类型的柱子代表一个要素中的不同属性，高度取决于属性值得大小。

　　PieChartSymbol对象实现IPieChartSymbol接口，用一个饼图来显示一个要素中的不同属性，不同属性按照他们的数值大小，占有不同比例的扇形区域。

　　StackedSymbol对象实现IStackedSymbol接口，堆积的柱子表示一个要素中的不同属性，Fixed属性为true时，每个柱子的高度都一样，false时，柱子尺寸根据要素类的属性来计算得出。