ArcEngine+C# TIN相关三维功能模块介绍(三)

ArcEngine+C#  TIN相关三维功能模块介绍(三)

——TreeView控件控制TIN颜色

作者:刘志远  
PDF浏览    控件下载

1.简介

 本篇介绍如何写一个带复选框及颜色指示图标的TreeView控件,该控件与TIN模型分级设色方案中的各级颜色相关联。通过该TreeView控件复选框的勾选状态决定TIN模型对应颜色层的显示与隐藏,再结合颜色选择下拉框控件,双击TreeView中的颜色图标,弹出颜色选择对话框,选择颜色后即可实时改变TIN模型中对应分级的颜色,效果图如下。注意观察TreeView中复选框为空的颜色层对应TIN的样式,此外,那个蓝色和紫色的层是经过修改过后的结果:

ArcEngine+C# TIN相关三维功能模块介绍(三)
颜色选择对话框

ArcEngine+C# TIN相关三维功能模块介绍(三)
运行效果界面截图

2.思路分析

 编写TIN颜色关联TreeView控件过程同上篇的编写颜色控件类似,先在项目下添加一个新的UserControl控件,再拖一个TreeView控件到UserControl上,将TreeViewDock属性设为Fill,,最后加入代码。

  TIN模型颜色可以通过ITinRenderer渲染器接口设置,ITinColorRampRenderer接口控制渲染器中的色带,通过遍历获取或设置ITinColorRampRenderer中的颜色值,再将改变后的ITinRenderer重新赋给TIN模型就行了。隐藏效果只是将对应层的颜色值设为NullColor即可。

         再稍微解释一下TreeView中颜色图标的实时联动更新。我是先生成一个动态的Image图片对象,该Image的颜色就是从TIN模型或颜色对话框中获得的颜色值,再依次将这些颜色图片存入一个ImageList对象中,再将该ImageList对象赋给TreeView,通过ImageList中图片的索引与TreeView中的节点(Node)相关联,这样就达到实时更新显示的效果。

3.完整代码

 下面是该控件的完整代码,具体的解释见代码注释:

using System;

using System.Drawing;

using System.Windows.Forms;

using ESRI.ArcGIS.Carto;

using ESRI.ArcGIS.Display;

using ESRI.ArcGIS.Controls;

using ESRI.ArcGIS.Analyst3D;

namespace CaseAnalyse

{

    /// <summary>

    /// 模仿ArcGISTOCControl控件,对TIN模型分级渲染颜色进行关联,

    /// 并通过复选框的勾选状态控制对应色带的显隐,

    /// 同时可双击颜色图标,实时修改对应层的颜色

    /// </summary>

    public partial class ColorControlView : UserControl

    {

        /// <summary>

        /// 颜色图标清单

        /// </summary>

        private ImageList pImageList;

 

        /// <summary>

        /// 激活的节点

        /// </summary>

        private TreeNode pTreeNode;

 

        /// <summary>

        /// 含有TIN的三维控件

        /// </summary>

        static private AxSceneControl _pSceneControl;

 

        //构造函数

        public ColorControlView()

        {

            InitializeComponent();

            treeView1.CheckBoxes = true;

        }

 

        /// <summary>

        /// 初始化,关联TIN图层颜色列表与TreeView控件

        /// </summary>

        /// <param name="pSceneControl">TIN图层的AxSceneControl控件</param>

        public void IniColorTree(AxSceneControl pSceneControl)

        {

            _pSceneControl = pSceneControl;

 

            ITinLayer pTinLayer = getTinLayer(_pSceneControl);

            if (pTinLayer == null)

                return;

 

            treeView1.Nodes.Clear();

            //TreeView绑定一个图片列表控件,该控件记录着所有的颜色图片

            pImageList = new ImageList();

            pImageList.ImageSize = new Size(16, 15);

            treeView1.ImageList = pImageList;

            //获得TIN模型的渲染器,这里假设只有一个渲染层

            ITinRenderer pRenderNew = pTinLayer.GetRenderer(0);

            ITinColorRampRenderer pElevRenderer = pRenderNew as ITinColorRampRenderer;

            if (pElevRenderer == null)

                return;

            ISimpleFillSymbol pSymbol = null;

 

            Color pColor = new Color();

            string lable = "";

            //遍历渲染层的分级颜色,并用生成动态临时图标,将其加入ImageList中,以备TreeView调用

            for (int i = 0; i < pElevRenderer.BreakCount; i++)

            {

                lable = pElevRenderer.get_Label(i);

                pSymbol = pElevRenderer.get_Symbol(i) as ISimpleFillSymbol;

                pColor = ColorTranslator.FromOle(pSymbol.Color.RGB);

 

                Image pImage = getImage(pColor);

                pImageList.Images.Add(pImage);

 

                TreeNode pTN = new TreeNode();

                pTN.Text = lable;

                pTN.Checked = true;

                pTN.ImageIndex = pImageList.Images.Count - 1;

                pTN.Tag = pColor;

 

                treeView1.Nodes.Add(pTN);

            }

        }

 

        /// <summary>

        /// 关联图标

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)

        {

            treeView1.SelectedImageIndex = treeView1.SelectedNode.ImageIndex;

        }

 

        /// <summary>

        /// 复选框勾选事件

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void treeView1_AfterCheck(object sender, TreeViewEventArgs e)

        {

            //调用颜色显隐方法

            ShowOrHideColor();

            treeView1.SelectedNode = e.Node;

        }

 

        /// <summary>

        /// 双击节点事件

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void treeView1_DoubleClick(object sender, EventArgs e)

        {

            if (treeView1.SelectedNode == null)

                return;

 

            pTreeNode = treeView1.SelectedNode;

            //调用改变颜色方法

            ChangeColor();

            //刷新颜色图标

            treeView1.SelectedNode = treeView1.Nodes[0];

            treeView1.SelectedNode = pTreeNode;

        }

 

        /// <summary>

        /// 获得颜色图标

        /// </summary>

        /// <param name="clr">图标颜色</param>

        /// <returns></returns>

        private static Image getImage(Color clr)

        {

            Panel pPanel = new Panel();

            pPanel.Visible = false;

            pPanel.Width = 16;

            pPanel.Height = 14;

 

            Bitmap pBitmap = new Bitmap(16, 14);

            Rectangle rc = new Rectangle(0, 0, 16, 14);

            pPanel.BackColor = clr;

            pPanel.DrawToBitmap(pBitmap, rc);

            Image pImage = (Image)pBitmap;

 

            return pImage;

        }

 

        /// <summary>

        /// 切换点选色带对应TIN中区域的显示/消隐状态

        /// 既通过给TIN一个新的渲染器来实现

        /// </summary>

        private void ShowOrHideColor()

        {

            ITinLayer pTinLayer = getTinLayer(_pSceneControl);

            if (pTinLayer == null)

                return;

 

            ITinRenderer pRenderNew = pTinLayer.GetRenderer(0);

            ITinColorRampRenderer pElevRenderer = pRenderNew as ITinColorRampRenderer;

            ISimpleFillSymbol pSymbol = null;

            int ClassCount = treeView1.Nodes.Count;

            //遍历TreeView节点,并依次设置渲染器样式

            for (int i = 0; i < ClassCount; i++)

            {

                pSymbol = pElevRenderer.get_Symbol(i) as ISimpleFillSymbol;

 

                IRgbColor rgb = new RgbColorClass();

                rgb.Red = ((Color)treeView1.Nodes[i].Tag).R;

                rgb.Green = ((Color)treeView1.Nodes[i].Tag).G;

                rgb.Blue = ((Color)treeView1.Nodes[i].Tag).B;

                IColor pC = rgb as IColor;

                if (!treeView1.Nodes[i].Checked)

                {

                    pC.NullColor = true;

                    pC.Transparency = 0;

                }

                pSymbol = new SimpleFillSymbolClass();

                pSymbol.Color = pC;

 

                //设置渲染器样式

                pElevRenderer.set_Symbol(i, pSymbol as ISymbol);

            }

 

            //创建TinEdgeRendererClass 类型的Renderer    

            pTinLayer.ClearRenderers();

            //插入一个渲染模型

            pTinLayer.InsertRenderer(pRenderNew, 0);

 

            //刷新渲染

            _pSceneControl.Scene.SceneGraph.Invalidate(pTinLayer, true, false);

            _pSceneControl.SceneViewer.Redraw(true);

            _pSceneControl.Scene.SceneGraph.RefreshViewers();

        }

 

        /// <summary>

        /// 改变点选色带对应TIN区域的颜色

        /// </summary>

        private void ChangeColor()

        {

            FrmChosePColor fChoseColor = new FrmChosePColor();

            if (fChoseColor.ShowDialog() == DialogResult.OK)

            {

                Color color = fChoseColor.pureColorComboBox1.SelectedColor;

                IRgbColor rgb = new RgbColorClass();

                rgb.Red = color.R;

                rgb.Green = color.G;

                rgb.Blue = color.B;

                IColor pC = rgb as IColor;

 

                Image pImage = getImage(color);

                pImageList.Images.Add(pImage);

                pTreeNode.ImageIndex = pImageList.Images.Count - 1;

                pTreeNode.Tag = color;

 

                treeView1.Refresh();

 

                ITinLayer pTinLayer = getTinLayer(_pSceneControl);

                if (pTinLayer == null)

                    return;

 

                ITinRenderer pRenderNew = pTinLayer.GetRenderer(0);

                ITinColorRampRenderer pElevRenderer = pRenderNew as ITinColorRampRenderer;

                ISimpleFillSymbol pSymbol = null;

                int ClassCount = treeView1.Nodes.Count;

                for (int i = 0; i < ClassCount; i++)

                {

                    if (i != pTreeNode.Index)

                        continue;

                    pSymbol = new SimpleFillSymbolClass();

 

                    if (!treeView1.Nodes[i].Checked)

                    {

                        pC.NullColor = true;

                        pC.Transparency = 0;

                    }

 

                    pSymbol.Color = pC;

                    pElevRenderer.set_Symbol(i, pSymbol as ISymbol);

                }

 

                //创建TinEdgeRendererClass 类型的Renderer    

                pTinLayer.ClearRenderers();

                pTinLayer.InsertRenderer(pRenderNew, 0);//插入一个渲染模型

 

                //渲染的刷新方法.

                _pSceneControl.Scene.SceneGraph.Invalidate(pTinLayer, true, false);

                _pSceneControl.SceneViewer.Redraw(true);

                _pSceneControl.Scene.SceneGraph.RefreshViewers();

            }

        }

 

        /// <summary>

        /// 获得三维控件中的TIN图层

        /// </summary>

        /// <param name="pSceneControl">TIN图层的AxSceneControl控件</param>

        /// <returns></returns>

        private static ITinLayer getTinLayer(AxSceneControl pSceneControl)

        {

            IScene pScene = pSceneControl.Scene;

            ITinLayer pTinLayer = null;

            for (int i = 0; i < pScene.LayerCount; i++)

            {

                ILayer lyr = pScene.get_Layer(i);

                if (lyr is ITinLayer)

                {

                    pTinLayer = lyr as ITinLayer;

                    break;

                }

            }

            return pTinLayer;

        }

    }

}

最后,只需要将该控件拖入相应的窗体中,调用控件的IniColorTree()方法,传入参数AxSceneControl即可,如下:

        private void button1_Click(object sender, EventArgs e)

        {

            //关联色板

            this.colorControlView1.IniColorTree(this.axSceneControl1);

        }

4.下一篇简介

       下一篇打算介绍如何从DEM栅格数据中提取等值线以及如何由DEM栅格数据生成TIN三维模型。最后把这个系列所设计的功能整合到一个程序中,以供感兴趣的朋友参考。

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