040集——CAD中放烟花（CAD—C#二次开发入门）

 效果如下：

单一颜色的烟花：

渐变色的火花：

namespace AcTools
{public class HH{public static TransientManager tm = TransientManager.CurrentTransientManager;public static Random rand = new Random();public static Vector3D G = new Vector3D(0,-10,0);// - Vector3D. * 10;public static Document doc => Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument;public static Editor ed => doc.Editor;[CommandMethod ("show")]public static void demo(){火花 h = new 火花();var psr = Z.ed.GetPoint("");while (psr.Status == PromptStatus.OK){//h.添加火点(new Point3d(500, -100, 0));h.添加火点(new Point3d( psr.Value.X +200,psr.Value .Y-20 ,0));h.添加火点(new Point3d(psr.Value.X - 200, psr.Value.Y+20, 0));h.添加火点(new Point3d(psr.Value.X + 400, psr.Value.Y - 20, 0));h.添加火点(new Point3d(psr.Value.X - 400, psr.Value.Y + 20, 0));psr = Z.ed.GetPoint("");}}}public class 火花:IDisposable{ Timer timer;List<火星>火星s=new List<火星> ();//int k = 0;public 火花(){timer = new Timer();火星s = new List<火星>();timer.Interval = 30;//相当于多久更新一下屏幕timer.Tick += 火星飞行事件;timer.Start();}public void 添加火点(Point3d pt){int n = new Random().Next(26, 40);//烟花的个数var sudu = new Random().Next(16,27);//速度int ys = HH.rand.Next(0, 5);//颜色Color cc;switch (ys){case 0:cc  =Color.FromRgb(255,0,0); break;//红case 1: cc = Rainbow(0, 255, 0); break;//绿case 2: cc = Rainbow(255, 255, 0); break;//黄case 3: cc = Rainbow(255, 0, 255); break;//紫case 4: cc = Rainbow(255, 186, 0); break;//橙default: cc = Rainbow(0, 0, 255); break;//蓝}double 衰减速度 = HH.rand.NextDouble() * 0.05 + 0.95;for (int i = 0; i < n; i++){var vt = new Vector3d(HH.rand.NextDouble() - 0.5, HH.rand.NextDouble() - 0.5, HH.rand.NextDouble() - 0.5);火星s.Add(new 火星(pt, vt, sudu, cc, 衰减速度));}}public static Color  Rainbow(int k, int min, int max){return Color.FromRgb((byte)k, (byte)min, (byte)max);}private  void 火星飞行事件(object sender, EventArgs e){foreach (var h in 火星s){h.运动();}List<Circle> cirs = new List<Circle>();for (int i = 火星s.Count-1; i  >=0   ; i--){if (火星s[i].灭){cirs.AddRange(火星s[i].cirs);火星s.RemoveAt(i);}}foreach (var c  in cirs){HH.tm.EraseTransient(c, new IntegerCollection());HH.ed.UpdateScreen();System.Windows .Forms.Application.DoEvents();}}public void Dispose(){timer.Tick -= 火星飞行事件;火星s.Clear();timer.Stop(); timer.Dispose();}}public delegate Autodesk.AutoCAD.Colors.Color 颜色(double k,double min,double max);class 火星{Random rand = new Random();public bool 灭;public List<Circle>cirs = new List<Circle>();Circle cir;int k;double 速度;int 总数量;Color 颜色渐变;double 衰减速度;Vector3D 方向;*
///
///
///public void 运动(){k++;var vt = 方向.GetNormal() * 速度;var g = new Vector3D(0, -10, 0);vt = vt + HH.G;cir.Center = cir.Center + vt;Circle cir1 = cir.Clone() as Circle;cir1.Color = 颜色渐变;cirs.Add(cir1);HH.tm.AddTransient(cir1, TransientDrawingMode.Main, 0, new IntegerCollection());速度 *= 衰减速度;if (k > 总数量 || 速度 < 0.1){灭 = true;}}}
}

finally