Silverlight 引路蜂二维图形库示例:动画Beziers曲线

概述类Path为一条几何路径，可以通过直线，二次曲线，三次曲线来构成任意路径。Path提供了moveTo, lineTo, curveTo, curveToCubic, closePath方法来构成路径。 下面的例子动态显示一条Bezier曲线。 /*** The animation thread.*/Thread _thread;bool _drawn;/** * The random

类Path为一条几何路径，可以通过直线，二次曲线，三次曲线来构成任意路径。Path提供了moveto,lineto,curveto,curvetoCubic,closePath方法来构成路径。

下面的例子动态显示一条BezIEr曲线。

/*** The animation thread.*/Thread _thread;bool _drawn;/** * The random number generator. */Readonly Random _random = new Random();/** * The animated path */Readonly Path _path = new Path();/** * Red brush used to fill the path. */Readonly SolIDBrush _brush = new SolIDBrush(color.Red);const int Numpts = 6;Readonly int[] _animpts = new int[Numpts * 2];Readonly int[] _deltas = new int[Numpts * 2]; private voID BezIErs(){ reset(screenWIDth,screenHeight); _thread = new Thread(RunBezIErs); _thread.Start();} private voID RunBezIErs(){  Thread me = Thread.CurrentThread;  if (!_drawn) {  lock (this)  {   graphics2D.Clear(color.White);   graphics2D.Fill(_brush,_path);   _drawn = true;  } } while (_thread == me) {  DrawDemo(screenWIDth,screenHeight); }} /*** Generates new points for the path.*/private voID Animate(int[] pts,int[] deltas,int i,int limit){ int newpt = pts[i] + deltas[i]; if (newpt <= 0) {  newpt = -newpt;  deltas[i] = (_random.Next() & 0x00000003) + 2; } else if (newpt >= limit) {  newpt = 2 * limit - newpt;  deltas[i] = -((_random.Next() & 0x00000003) + 2); } pts[i] = newpt;} /*** resets the animation data.*/private voID reset(int w,int h){ for (int i = 0; i < _animpts.Length; i += 2) {  _animpts[i + 0] = (_random.Next() & 0x00000003) * w / 2;  _animpts[i + 1] = (_random.Next() & 0x00000003) * h / 2;  _deltas[i + 0] = (_random.Next() & 0x00000003) * 6 + 4;  _deltas[i + 1] = (_random.Next() & 0x00000003) * 6 + 4;  if (_animpts[i + 0] > w / 2)  {   _deltas[i + 0] = -_deltas[i + 0];  }  if (_animpts[i + 1] > h / 2)  {   _deltas[i + 1] = -_deltas[i + 1];  } }} /** * Sets the points of the path and draws and fills the path. */private voID DrawDemo(int w,int h){ for (int i = 0; i < _animpts.Length; i += 2) {  Animate(_animpts,_deltas,i + 0,w);  Animate(_animpts,i + 1,h); } //Generates the new pata data. _path.reset(); int[] ctrlpts = _animpts; int len = ctrlpts.Length; int prevx = ctrlpts[len - 2]; int prevy = ctrlpts[len - 1]; int curx = ctrlpts[0]; int cury = ctrlpts[1]; int mIDx = (curx + prevx) / 2; int mIDy = (cury + prevy) / 2; _path.Moveto(mIDx,mIDy); for (int i = 2; i <= ctrlpts.Length; i += 2) {  int x1 = (curx + mIDx) / 2;  int y1 = (cury + mIDy) / 2;  prevx = curx;  prevy = cury;  if (i < ctrlpts.Length)  {   curx = ctrlpts[i + 0];   cury = ctrlpts[i + 1];  }  else  {   curx = ctrlpts[0];   cury = ctrlpts[1];  }  mIDx = (curx + prevx) / 2;  mIDy = (cury + prevy) / 2;  int x2 = (prevx + mIDx) / 2;  int y2 = (prevy + mIDy) / 2;  _path.Curveto(x1,y1,x2,y2,mIDx,mIDy); } _path.ClosePath(); // clear the clipRect area before production  graphics2D.Clear(color.White); graphics2D.Fill(_brush,_path);  RefreshBitmap(); }

其中实时更新图像需要CompositionTarget.Rendering事件来处理。CompositionTarget.Rendering += CompositionTargetRendering;

private voID CompositionTargetRendering(object sender,EventArgs e){ bmp.InvalIDate();}

 

总结

以上是内存溢出为你收集整理的Silverlight 引路蜂二维图形库示例:动画Beziers曲线全部内容，希望文章能够帮你解决Silverlight 引路蜂二维图形库示例:动画Beziers曲线所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。