首先来看看实现的效果:

QQ截图20130615113301.bmp 

比较丑陋,还望大家见怪,呵呵~~~,接下来给大家看看设计的界面吧:

QQ截图20130615113229.bmp 

界面比较丑陋,主要控件为:

四个combox,三个textbox和两个按钮,属性值设置在此不详述,还望见谅……

下面看看实现代码:

1、窗体加载事件:

/// <summary>
        /// 窗体加载
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void formLabel_Load(object sender, EventArgs e)
        {
            //字体大小
            for (int i = 5; i < 73; i++)
            {
                this.cmbFontsSize.Items.Add(i.ToString());
            }
            //字体样式
            string[] strFontsStyle = new string[] {"宋体","Times New Roman","隶书","黑体","仿宋","新宋体","幼圆" };
            for (int i = 0; i < strFontsStyle.Length; i++)
            {
                this.cmbFontsStyle.Items.Add(strFontsStyle[i]);
            }
            //添加图层
            AddLayers();
        }

此处,调用了AddLayers这个方法,其代码为:

/// <summary>
        /// 添加图层
        /// </summary>
        private void AddLayers()
        {
            //首先清除
            cmbLayers.Items.Clear();
            //加载图层,默认选择第一个图层
            int layerCount = _mapControl.LayerCount;
            for (int i = 0; i < layerCount; i++)
            {
                cmbLayers.Items.Add(_mapControl.get_Layer(i).Name);
            }
            if (layerCount != 0)
            {
                cmbLayers.SelectedIndex = 0;
            }
        }

在窗体加载事件中,完成了图层的加载,以及字体大小,字体样式值等的初始化工作,接着,图层cmbLayers的选择改变事件,实现加载该图层的字段,详细代码如下:

/// <summary>
        /// 显示字段
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void cmbLayers_SelectedIndexChanged(object sender, EventArgs e)
        {
            //清空字段列表
            cmbFields.Items.Clear();
            //改变字段列表
            //获取选择的图层
            IFeatureLayer featureLayer = _mapControl.get_Layer(cmbLayers.SelectedIndex) as IFeatureLayer;
            IFeatureClass featureClass = featureLayer.FeatureClass;
            int fieldsCount = featureClass.Fields.FieldCount;
            for (int i = 0; i < fieldsCount; i++)
            {
                IField field = featureClass.Fields.get_Field(i);
                //除去Shape字段
                if (field.Name == "Shape")
                {
                    continue;
                }
                cmbFields.Items.Add(field.Name);
            }
        }

到此,标注样式的设置工作业已完成,接下来就是要进行对图层进行标注了,看看那个“确定”按钮的事件:

/// <summary>
        /// 添加标注
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnOk_Click(object sender, EventArgs e)
        {
            AddLabel addlabel = new AddLabel();
            ILayer mLayer = _mapControl.get_Layer(cmbLayers.SelectedIndex) as ILayer;
            addlabel.AddAnnotate(mLayer, this.cmbFields.Text, cmbFontsStyle.Text, double.Parse(cmbFontsSize.Text), int.Parse(txtR.Text), int.Parse(txtG.Text), int.Parse(txtB.Text));
            _mapControl.ActiveView.Refresh();
            this.Close();
        }
在该按钮事件中调用了AddLabel这个类的AddAnnotate方法,在AddAnnotate方法中包含7个参数,标注的图层,标注字段,字体大小,字体样式以及字体颜色的RGB值,类AddLabel的代码如下:

using System;
using System.Collections.Generic;
using System.Linq;

//ArcEngine引用
using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Display;
using stdole;

namespace MapDemo
{
    public class AddLabel
    {
        private GetRgbColor getrgbcolor = new GetRgbColor();
        //添加标注,比TextElment功能更强大
        public void AddAnnotate(ILayer layer, string fieldName,string fontFamily,double fontSize,int colorR,int colorG,int colorB)
        {
            IGeoFeatureLayer pGeoLayer = layer as IGeoFeatureLayer;
            IAnnotateLayerPropertiesCollection IPALPColl = pGeoLayer.AnnotationProperties;
            IPALPColl.Clear();

            IRgbColor pColor = getrgbcolor.GetRGBColor(colorR, colorG, colorB);
            IFontDisp pFont = new StdFont()
            {
                Name = fontFamily,
                Bold = true
            } as IFontDisp;

            ITextSymbol pTextSymbol = new TextSymbolClass()
            {
                Color = pColor,
                Font = pFont,
                Size = fontSize
            };

            //用来控制标注和要素的相对位置关系
            ILineLabelPosition pLineLpos = new LineLabelPositionClass()
            {
                Parallel = false,  //修改标注的属性
                Perpendicular = true,
                InLine = true
            };
            //用来控制标注冲突
            ILineLabelPlacementPriorities pLinePlace = new LineLabelPlacementPrioritiesClass()
            {
                AboveStart = 5, //让above 和start的优先级为5
                BelowAfter = 4
            };
            //用来实现对ILineLabelPosition 和 ILineLabelPlacementPriorities以及更高级属性的控制
            IBasicOverposterLayerProperties pBOLP = new BasicOverposterLayerPropertiesClass()
            {
                FeatureType = esriBasicOverposterFeatureType.esriOverposterPolygon,
                LineLabelPlacementPriorities = pLinePlace,
                LineLabelPosition = pLineLpos
            };

            //创建标注对象
            ILabelEngineLayerProperties pLableEngine = new LabelEngineLayerPropertiesClass()
            {
                Symbol = pTextSymbol,
                BasicOverposterLayerProperties = pBOLP,
                IsExpressionSimple = true,
                Expression = "[" + fieldName + "]"
            };

            //设置标注的参考比例尺
            IAnnotateLayerTransformationProperties pAnnoLyrPros = pLableEngine as IAnnotateLayerTransformationProperties;
            pAnnoLyrPros.ReferenceScale = 2500000;

            //设置标注可见的最大最小比例尺
            IAnnotateLayerProperties pAnnoPros = pLableEngine as IAnnotateLayerProperties;
            pAnnoPros.AnnotationMaximumScale = 2500000;
            pAnnoPros.AnnotationMinimumScale = 25000000;
            //pAnnoPros.WhereClause属性  设置过滤条件

            IPALPColl.Add(pAnnoPros);
            pGeoLayer.DisplayAnnotation = true;
        }
    }
}

至此,已完成标注工作,那个取消按钮就不说了。

总结一下,本实例完成了对图层属性的标注,但存在以下问题:
1、不能够随地图的放大与缩小而产生相对应的放大或者缩小的变化;
2、对于标注的重叠没有处理;
3、没实现控制其摆放位置和方向。

后续还会继续对之上述问题进行优化,还望大家多多支持与鼓励!同时,有能解决上述方法的同仁还望不吝赐教!

posted on 2013-06-15 12:02  LZU-GIS  阅读(229)  评论(0编辑  收藏  举报