026集——CAD动态效果—瞬态实现——vs CAD二次开发

瞬态类特点是不写入dwg图形的数据库中，只是临时显示的效果。

通过按ESC键更新显示，效果如下（颜色colorindex不能为0，否则有的版本不显示）：

首先创建瞬态类，代码如下：

using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.GraphicsInterface;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AcTools
{
    public class Flash 
    {
        public FlashEntity flash = null;
        public Entity ent = null;
        public Flash(Circle ent)
        {
            this.ent = ent;
            flash = new FlashEntity(ent);
            Transient.CapturedDrawable = flash;
            TransientManager.CurrentTransientManager.AddTransient(flash,
                    TransientDrawingMode.Main, 128, new IntegerCollection());
        }

        public void FlashUpdate(Circle ent)
        {
            if (ent == null)
            {
                this.ent = ent;
                flash = new FlashEntity(ent);
                Transient.CapturedDrawable = flash;
                TransientManager.CurrentTransientManager.AddTransient(flash,
                    TransientDrawingMode.Main, 128, new IntegerCollection());
            }
            else
            {
                this.ent = ent;
                flash._ent = ent;
                TransientManager.CurrentTransientManager.UpdateTransient(flash, new IntegerCollection());
            }

        }
        public void FlashErase()
        {
            if (flash == null) return;
            flash._ent = null;
            TransientManager.CurrentTransientManager.EraseTransient(flash, new IntegerCollection());
            flash = null;
        }
    }
    public class FlashEntity : Transient
    {
        public Entity _ent;
        public FlashEntity(Entity ent)
        {
            _ent = ent;
        }

        protected override int SubSetAttributes(DrawableTraits traits)
        {
            traits.FillType = FillType.FillAlways;
            return (int)DrawableAttributes.IsAnEntity;
        }

        protected override void SubViewportDraw(ViewportDraw vd)
        {
            vd.Geometry.Draw(_ent);
        }

        protected override bool SubWorldDraw(WorldDraw wd)
        {
            return false;
        }
    }
}

然后开始用瞬态实现动画：

using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.Runtime;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using AcTools;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Colors;
using System.Runtime.CompilerServices;
using Wform = System.Windows.Forms;
using System.IO;
using System.Windows.Forms;
using Excel=  Microsoft.Office.Interop.Excel.Application;
using Autodesk.AutoCAD.Windows;
//using UserControl = System.Windows.Controls.UserControl;
//PaletteSet integration
using System.Windows.Forms.Integration;
using Autodesk.AutoCAD.Internal;


namespace AcTools
{
    public  class Class1
    {
        Flash _flash;//定义一个瞬态flash变量
        [CommandMethod("xx")]
        public  void XX()
        {
            List<Flash> listflash = new List<Flash>();//实例化一个瞬态flash
            List<Circle> listcircle = new List<Circle>();
            for (int i = 0; i < 30; i++)//创建50个圆并加入flash列表中
            {
                Circle circle = new Circle() { Radius = i+1,ColorIndex = i+1};
                listcircle.Add(circle);
                _flash = new Flash(listcircle[i]);
                listflash.Add(_flash);  
            }
            //Z.Zoom();
            Z.ed.GetPoint("");

            //20次esc键,观看动态效果
            for (int j = 0; j < 20; j++)
            {   //瞬态中50个圆更新属性
                for (int i = 0; i < 30; i++)
                {
                    listcircle[i].Radius = listcircle[i].Radius+1;
                    listcircle[i].ColorIndex = 255 - listcircle[i].ColorIndex;
                    listflash[i].FlashUpdate(listcircle[i]);
                }
   
                Z.ed.GetPoint("");
            }
            for (int i = 0; i < 30; i++)
            {
                listflash[i].FlashErase();//删除瞬态
            }

        }
    }
}