MxCAD COM入门

最新推荐文章于 2025-02-21 18:37:41 发布

原创最新推荐文章于 2025-02-21 18:37:41 发布 · 558 阅读

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文章标签：

#c# #com #MxDraw

本文介绍了如何在C#环境下利用梦想CAD提供的COM接口进行图形操作。通过生成的AxInterop.MxDrawXLib.dll和Interop.MxDrawXLib.dll，可以创建和控制MxDraw控件，以及操作图形对象。示例代码展示了创建和修改线条，以及注册和实现自定义命令的过程。

梦想CAD是专业的CAD插件（控件）,不需安装AutoCAD即可运行。
在C#和VB中使用MxCAD的COM接口很方便，使用aximp命令或者在工具栏里面添加MxDraw com组件后，会生成AxInterop.MxDrawXLib.dll和Interop.MxDrawXLib.dll，前者主要是创建MxDraw控件，控制它的界面，响应它的事件。后者主要提供MxDraw数据库接口，操作图形对象。
下面使用代码：

        private void InitializeComponent()
        {
            System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(Form1));
            this.axMxDrawX1 = new AxMxDrawXLib.AxMxDrawX();
            ((System.ComponentModel.ISupportInitialize)(this.axMxDrawX1)).BeginInit();
            this.SuspendLayout();
            // 
            // axMxDrawX1
            // 
            this.axMxDrawX1.Enabled = true;
            this.axMxDrawX1.Location = new System.Drawing.Point(12, 2);
            this.axMxDrawX1.Name = "axMxDrawX1";
            this.axMxDrawX1.OcxState = ((System.Windows.Forms.AxHost.State)(resources.GetObject("axMxDrawX1.OcxState")));
            this.axMxDrawX1.Size = new System.Drawing.Size(776, 436);
            this.axMxDrawX1.TabIndex = 0;
            this.axMxDrawX1.ImplementCommandEvent += new AxMxDrawXLib._DMxDrawXEvents_ImplementCommandEventEventHandler(this.axMxDrawX1_ImplementCommandEvent);
            this.axMxDrawX1.InitComplete += new System.EventHandler(this.OnInitComplete);
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(800, 450);
            this.Controls.Add(this.axMxDrawX1);
            this.Name = "Form1";
            this.Text = "Form1";
            ((System.ComponentModel.ISupportInitialize)(this.axMxDrawX1)).EndInit();
            this.ResumeLayout(false);
        }
        
        private void OnInitComplete(object sender, EventArgs e)
        {
        	// create line
            long id = this.axMxDrawX1.DrawLine(0, 0, 10, 10);
            // modify line
            var db = this.axMxDrawX1.GetDatabase() as MxDrawXLib.MxDrawDatabase;
            var obj = db.ObjectIdToObject(id);
            var ent = obj as MxDrawXLib.MxDrawEntity;
            ent.colorIndex = MxDrawXLib.MCAD_COLOR.mcRed;
            // register command "myLine"
            axMxDrawX1.RegistUserCustomCommand("myLine", 55);
        }

        private void axMxDrawX1_ImplementCommandEvent(object sender, AxMxDrawXLib._DMxDrawXEvents_ImplementCommandEventEvent e)
        {
            //实例化控件工具集合
            var mxUtility = new MxDrawXLib.MxDrawUtilityClass();
            // implement command 55, that is, "myLine"
            if (e.iCommandId == 55)
            {
                //点取第一点 
                var point = mxUtility.GetPoint(null, "点取第一点:");
                if (point == null)
                {
                    MessageBox.Show("用户取消...");
                    return;
                }
                //点取第二点
                var point2 = mxUtility.GetPoint(point, "点取第二点:");
                if (point2 == null)
                {
                    MessageBox.Show("用户取消...");
                    return;
                }
                //调用绘制直线函数
                axMxDrawX1.DrawLine(point.x, point.y, point2.x, point2.y);
            }
        }