Teigha4.0加載顯示Dwg文件

Teigha4.0加載顯示Dwg文件

網上顯示Dwg的例子不是很好找，最好還是去官網下載例子。
這裏的demo大抵參考官網例子完成的。

初始化驅動

在窗體加載事件裏面初始化顯示驅動，代碼怎麼看都很奇怪，但人家就是這種寫法
需要注意的是加載模塊的名稱，官網例子是WinOpenGL.txv、3.0版本的是WinGDI.gs、這裏加載WinBitmap.txv模塊，這幾個到底啥含義沒有去深究。

           PaintGraphics = Graphics.FromHwnd(panel.Handle);
            GsModule gsModule = (GsModule)SystemObjects.DynamicLinker.LoadModule("WinBitmap.txv", false, true);
            Device = gsModule.CreateDevice();
            Device.Properties.AtPut("WindowHWND", new RxVariant(panel.Handle));
            Device.Properties.AtPut("WindowHDC", new RxVariant(PaintGraphics.GetHdc()));
            Device.Properties.AtPut("DoubleBufferEnabled", new RxVariant(true));
            Device.Properties.AtPut("EnableSoftwareHLR", new RxVariant(true));
            panel.Resize += Panel_Resize;

加載數據顯示

首先打開數據源->創建數據上下文->初始化佈局->設置數據顯示範圍

    OpenFileDialog openFileDialog = new OpenFileDialog();
            openFileDialog.RestoreDirectory = true;
            openFileDialog.Filter = "DWG文件(*.dwg)|**.dwg";
            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {
                DwgDatabase = new Database(false, false);
                DwgDatabase.ReadDwgFile(openFileDialog.FileName, FileOpenMode.OpenForReadAndReadShare, false, "");
                ContextForDbDatabase contextForDbDatabase = new ContextForDbDatabase(DwgDatabase);
            contextForDbDatabase.UseGsModel = true;
            LayoutHelper = LayoutHelperDevice.SetupActiveLayoutViews(Device, contextForDbDatabase);
            LayoutHelper.UserGiContext = contextForDbDatabase;
            LayoutHelper.SetLogicalPalette(Device.DarkPalette);
            Rectangle rectangle = panel.Bounds;
            rectangle.Offset(-panel.Location.X, -panel.Location.Y);
            LayoutHelper.OnSize(rectangle);
            panel.Invalidate();
            }

釋放資源

在窗體關閉時需要釋放相關的對象實例

  if (DwgDatabase != null)
            {
                DwgDatabase.Dispose();
                Device.Dispose();
                LayoutHelper.Dispose();
                PaintGraphics.Dispose();
            }

全部代碼

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Teigha.DatabaseServices;
using Teigha.GraphicsInterface;
using Teigha.GraphicsSystem;
using Teigha.Runtime;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        public Database DwgDatabase { get; set; }

        public Device Device { get; set; }

        public LayoutHelperDevice LayoutHelper { get; set; }

        public Graphics PaintGraphics { get; set; }

        private void Form1_Load(object sender, EventArgs e)
        {
            CreateDevice();
        }

        private void panel_Paint(object sender, PaintEventArgs e)
        {
            if (LayoutHelper == null)
            {
                return;
            }
            LayoutHelper.Update();
        }

        private void Panel_Resize(object sender, EventArgs e)
        {
            if (LayoutHelper == null)
            {
                return;
            }
            Rectangle rectangle = panel.Bounds;
            rectangle.Offset(-panel.Location.X, -panel.Location.Y);
            LayoutHelper.OnSize(rectangle);
        }

        private void 打開ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            OpenFileDialog openFileDialog = new OpenFileDialog();
            openFileDialog.RestoreDirectory = true;
            openFileDialog.Filter = "DWG文件(*.dwg)|**.dwg";
            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {
                DwgDatabase = new Database(false, false);
                DwgDatabase.ReadDwgFile(openFileDialog.FileName, FileOpenMode.OpenForReadAndReadShare, false, "");
                CreateLayout();
            }
        }

        private void CreateDevice()
        {
            PaintGraphics = Graphics.FromHwnd(panel.Handle);
            GsModule gsModule = (GsModule)SystemObjects.DynamicLinker.LoadModule("WinBitmap.txv", false, true);
            Device = gsModule.CreateDevice();
            Device.Properties.AtPut("WindowHWND", new RxVariant(panel.Handle));
            Device.Properties.AtPut("WindowHDC", new RxVariant(PaintGraphics.GetHdc()));
            Device.Properties.AtPut("DoubleBufferEnabled", new RxVariant(true));
            Device.Properties.AtPut("EnableSoftwareHLR", new RxVariant(true));
            panel.Resize += Panel_Resize;
        }

        private void CreateLayout()
        {
            ContextForDbDatabase contextForDbDatabase = new ContextForDbDatabase(DwgDatabase);
            contextForDbDatabase.UseGsModel = true;
            LayoutHelper = LayoutHelperDevice.SetupActiveLayoutViews(Device, contextForDbDatabase);
            LayoutHelper.UserGiContext = contextForDbDatabase;
            LayoutHelper.SetLogicalPalette(Device.DarkPalette);
            Rectangle rectangle = panel.Bounds;
            rectangle.Offset(-panel.Location.X, -panel.Location.Y);
            LayoutHelper.OnSize(rectangle);
            panel.Invalidate();
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (DwgDatabase != null)
            {
                DwgDatabase.Dispose();
                Device.Dispose();
                LayoutHelper.Dispose();
                PaintGraphics.Dispose();
            }
        }
    }
}